Difference between revisions of "FFmpeg Wishlist"

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Temporary FFmpeg wish/todo list:
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The various desired features for FFmpeg can be found in the following pages:
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* [https://roundup.mplayerhq.hu/roundup/ffmpeg/issue?%40&%40columns=title&%40columns=topic&id=&%40columns=id&%40columns=activity&%40sort=activity&%40columns=priority&%40group=priority&type=2&status=2&%40columns=substatus&%40pagesize=50&%40startwith=0&%40action=search Open feature requests in the issue tracker]
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* [http://svn.mplayerhq.hu/ffmpeg/trunk/doc/TODO?view=co TODO file in the SVN tree]
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* [[FFmpeg Summer Of Code]] pages
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* Finish and commit any code not yet commited at the [http://svn.mplayerhq.hu/soc/ SoC FFmpeg tree]
 +
 
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Also, other features requests can be found in:
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* [https://roundup.mplayerhq.hu/roundup/ffmpeg/issue?%40&%40columns=title&%40columns=topic&id=&%40columns=id&%40columns=activity&%40sort=activity&%40columns=priority&%40group=priority&type=2&status=1&%40columns=substatus&%40pagesize=50&%40startwith=0&%40action=search Feature requests marked as "new"]
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* Below in this page (mostly deprecated items)
 +
 
 +
 
 +
See also the discussion about [[Ffmpeg audio api|Audio API]] TODOs.
 +
 
 +
 
 +
 
 +
 
 +
 
 +
 
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= Old list =
 +
 
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The following is deprecated, please '''do not''' add new items to this list, use instead the issue tracker. Also, send a message to the mailing list before implementing one of those items. They could be work-in-progress or not wanted anymore.
 +
 
 +
Moving any of these items to a '''proper''' feature request in the issue tracker is welcome.
  
== FFmpeg module refactoring==
 
Multimedia programs tend to be highly modular in design and FFmpeg is no exception. However, it does not make the best use of independent modules. The major task in refactoring FFmpeg modules will be to reorganize code so that each individual codec or muxer/demuxer module can be easily enabled and disabled at compile time. This task also entails creating a test suite that can automatically enable each module, one at a time, and validate that FFmpeg still builds and works.
 
  
 
== Decoders ==
 
== Decoders ==
* [[H.264|H.264 (MPEG-4 AVC)]] decoder improvements/enhancements:
 
** Add PAFF to the existing [[H.264]] decoder
 
**Assembly optimizations (like SIMD for [http://en.wikipedia.org/wiki/3DNow%21 3DNow], [http://en.wikipedia.org/wiki/MMX MMX/MMX2], [http://en.wikipedia.org/wiki/Streaming_SIMD_Extensions SSE/SSE2/SSE3] and [http://en.wikipedia.org/wiki/AltiVec AltiVec])
 
* [[VC-1]] (a.k.a. Microsoft Windows Media Video 3 or 9) decoder improvements/enhancements:
 
**Assembly optimizations (like SIMD for [http://en.wikipedia.org/wiki/3DNow%21 3DNow], [http://en.wikipedia.org/wiki/MMX MMX/MMX2], [http://en.wikipedia.org/wiki/Streaming_SIMD_Extensions SSE/SSE2/SSE3] and [http://en.wikipedia.org/wiki/AltiVec AltiVec])
 
* LGPL'ed LC-AAC and HE-AAC ([[AAC|Advanced Audio Coding]]) decoder, based on the emerging [[Understanding AAC|open specification Wiki document]].
 
**Also add a aac parser so -acodec copy to mp4/mov will work
 
**Assembly optimizations (like SIMD for [http://en.wikipedia.org/wiki/3DNow%21 3DNow], [http://en.wikipedia.org/wiki/MMX MMX/MMX2], [http://en.wikipedia.org/wiki/Streaming_SIMD_Extensions SSE/SSE2/SSE3] and [http://en.wikipedia.org/wiki/AltiVec AltiVec])
 
* [http://www.codingtechnologies.com/products/aacPlus.htm aacPlus] (a.k.a. AAC+) decoder Note: aacPlus v1 is HE-AAC + [http://www.codingtechnologies.com/products/sbr.htm SBR], aacPlus v2 is HE-AAC + [http://www.codingtechnologies.com/products/sbr.htm SBR] + [http://www.codingtechnologies.com/products/paraSter.htm PS].
 
* [http://www.codingtechnologies.com/products/mp3pro.htm mp3PRO] decoder (Note: mp3PRO is MP3 + [http://www.codingtechnologies.com/products/sbr.htm SBR]. Standard MP3 decoders can decode mp3PRO encoded files/streams but without [http://www.codingtechnologies.com/products/sbr.htm SBR] you do not get the full quality.
 
* [http://www.mpegsurround.com MPEG Surround] decoder/parser (for all audio but especially MP3/mp3PRO and AAC/aacPlus as those are in use today).
 
* [[ALAC]] decoder improvements/enhancements:
 
**Clean up the existing alac decoder code
 
* ffsvq3 (FFmpeg SVQ3) decoder improvements/enhancements:
 
** add b-frame support to the ffsvq3 decoder
 
* [[AMR]] decoder
 
* integrate speex (glue code or native)
 
* g723.1/rtp decoder
 
* g729/rtp decoder
 
* Monkey's Audio decoder (APE)
 
**[http://www.monkeysaudio.com/files/MAC_SDK_399.zip] (original C++ SDK sources)
 
**[http://sourceforge.net/projects/mac-port/] (original sources port for non-win32 platforms)
 
**[http://jmac.sourceforge.net/]LGPLed Java implementation
 
* JPEG2000 decoder
 
* [[Dirac]] decoder ([[Dirac]] is a video codec developed by [[BBC]] as an open standard, shares some features with [[Snow]])
 
* [[GSM]] decoder
 
* QCELP decoder [http://www.3gpp2.org/Public_html/specs/alltsgscfm.cfm spec] is c.s0020 and source is c.r0020
 
* AMV decoder, http://scrub50187.com/ has the creator. wikipedia has [http://en.wikipedia.org/wiki/AMV_video_format articles] about the format also.
 
* integer only vorbis decoder (to replace tremor)
 
* Fix "[rv20 @ 009C8BF0]unknown bit3 set" in rv20 decoder
 
* Add [[XINTRA8|j-type]] picture support to the existing wmv8 decoder
 
* [[MLP]] decoder
 
* Indeo 4 decoder and Indeo 5 decoder
 
 
* [[xeb|XEB]] - the [[RatDVD]] video codec (stored in [[xvo|XVO]] container format)
 
* [[xeb|XEB]] - the [[RatDVD]] video codec (stored in [[xvo|XVO]] container format)
 
* VNC decoder, files created by vncrec. Re-use code from [[VMware Video]] decoder http://www.sodan.org/~penny/vncrec/
 
* VNC decoder, files created by vncrec. Re-use code from [[VMware Video]] decoder http://www.sodan.org/~penny/vncrec/
* RealAudio [[RealAudio sipr|Sipro]] decoder
 
* Fix distortion in [[QDM2]] decoder
 
* Implement alternate entropy coding method in [[VP6]] decoder [https://roundup.mplayerhq.hu/roundup/ffmpeg/issue104]
 
 
* Additional game formats support:
 
* Additional game formats support:
 
** [[VQA]] v3 support, see http://www.gamers.org/pub/idgames2/planetquake/planetcnc/cncdz/
 
** [[VQA]] v3 support, see http://www.gamers.org/pub/idgames2/planetquake/planetcnc/cncdz/
 
** [[Gremlin Digital Video]]
 
** [[Gremlin Digital Video]]
** [[ARMovie|ARMovie/RPL]]
 
** [[ESCAPE]]
 
 
** [[M95]]
 
** [[M95]]
** XMV / FMV (Xbox Media Video) decoder/demuxer (for the first Microsoft Xbox game-console, based on WMV8)
 
*** Working legal source code for a decoder/demuxer can be found here but it is copyrighted and without open source licence: http://sourceforge.net/tracker/index.php?func=detail&aid=1097094&group_id=53761&atid=471491 also look at http://thread.gmane.org/gmane.comp.video.ffmpeg.devel/25207/focus=25224 and http://www.maxconsole.net/?mode=news&newsid=411 for hints/tips
 
 
== Encoders ==
 
*MP3 encoder (a simple fixedpoint implementation using existing infrastructure in ffmpeg when possible)
 
*Implement a good [[Psychoacoustic Model|psychoacoustic model]]
 
**Support the usage of this [[Psychoacoustic Model|psychoacoustic model]] from the AC3, MP2 and other audio encoders
 
*[[Snow]] - the FFmpeg's projects own video codec
 
** Write a formal specification of the codec and document the implementation.
 
***DocBook, rst, or doxygen for the code documentation steps
 
***A complete roadmap will be decided together with the candidates
 
** Improve the optimizations and refine the implementation in order to have FFmpeg playing [[Snow]] in more constrained environments
 
***Avoid cache trashing and vectorize the code
 
*** AltiVec, MMX/SSE, VIS or any other vector extension assembly/C intrinsics for your favourite arch
 
*** AltiVec would preferably be written as intrinsics
 
*** SSE/MMX/3dNow! code as inline assembly.
 
** multiple reference frames improvements
 
*** decide which frames to keep (e.g. long-term refs)
 
*** some changes to the mv prediction code
 
** non-translational motion-compensation
 
*** estimate non translational parameters per block by using surrounding motion vectors
 
*** add a ac coded bit per block to switch between translational and non-translational MC
 
*** borrow the non translational MC code from libmpcodecs/vf_perspective.c
 
*** some changes to the encoder to decide between translational and non t.
 
** Trellis quantization (select quantized coefficient so as to minimize the rate distrortion
 
** 4x4 sized block support (we have 16x16 and 8x8 currently)
 
** 1/8 pel motion compensation / estimation support (pretty much just encoder changes needed which in case of the iterative me should be trivial)
 
** improve the intra color decision
 
  
 
== Demuxers ==
 
== Demuxers ==
*  iff demuxer (with anim and sound decoding)
 
** mark cox (melbournemark at gmail dot com) is currently working on this.
 
** [http://www.xinehq.de xine] has a demuxer/decoder for iff. Manfred Tremmel the author of the xine code has agreed to relicence his xine code as LGPL to allow easier use in ffmpeg. Thanks Manfred.
 
** Werner Randelshofer the author of [http://www.randelshofer.ch/multishow/ multishow] has also granted permission for his iff code to be relicenced as LGPL. Thanks Werner.
 
** Xanim also contains code to support iff, it may contain some formats not available in xine.
 
*  g723.1 / rtp demuxer
 
*  g729 / rtp demuxer
 
*  VIVO demuxer, look at the mplayer vivo demuxer for reference
 
* XMV / FMV (Xbox Media Video) demuxer (from Microsoft and based on WMV8)
 
** Open source and legal demuxer/decoder but copyrighted source/specification:
 
http://sourceforge.net/tracker/index.php?func=detail&aid=1097094&group_id=53761&atid=471491 also look at http://thread.gmane.org/gmane.comp.video.ffmpeg.devel/25207/focus=25224 and http://www.maxconsole.net/?mode=news&newsid=411 for hints/tips
 
*  AMV demuxer, http://scrub50187.com/ has the creator. wikipedia has [http://en.wikipedia.org/wiki/AMV_video_format articles] about the format also.
 
 
* [[FluxDVD]] / [[RatDVD]] demuxer for [[xvo|XVO]] files (Note! [[RatDVD]] is the predecesor of [[FluxDVD]])
 
* [[FluxDVD]] / [[RatDVD]] demuxer for [[xvo|XVO]] files (Note! [[RatDVD]] is the predecesor of [[FluxDVD]])
* [[NUT]] demuxer (and container format specifications enhancements/improvements)
 
**improve the documentation available for FFmpeg's [[NUT]] implementation
 
*** Study the current specification and clarify it, putting it in a more verbose and understandable form.
 
*** Conversion to rst or docbook isn't really required, but would be greatly appreciated.
 
** Update the demuxer using libnut-produced files as testcases
 
*** Testcase 1: it should demux the complete file correctly as sequential reads
 
*** Testcase 2: it should seek correctly in the complete file
 
*** Testcase 3: same as 1 but with corrupted file
 
*** Testcase 4: same as 2 but with corrupted file
 
** Update the muxer using libnut and ffnut demuxer to validate the produced files
 
*** Make sure that the interleaving rules are respected.
 
  
 
== Muxers ==
 
== Muxers ==
Line 115: Line 46:
 
* NSV muxer
 
* NSV muxer
 
* NSA muxer
 
* NSA muxer
* [[NUT]] muxer (and container format specifications enhancements/improvements)
 
**improve the documentation available for FFmpeg's [[NUT]] implementation
 
*** Study the current specification and clarify it, putting it in a more verbose and understandable form.
 
*** Conversion to rst or docbook isn't really required, but would be greatly appreciated.
 
** Update the demuxer using libnut-produced files as testcases
 
*** Testcase 1: it should demux the complete file correctly as sequential reads
 
*** Testcase 2: it should seek correctly in the complete file
 
*** Testcase 3: same as 1 but with corrupted file
 
*** Testcase 4: same as 2 but with corrupted file
 
** Update the muxer using libnut and ffnut demuxer to validate the produced files
 
*** Make sure that the interleaving rules are respected.
 
  
== libavformat API improvements/enhancements ==
 
The [[libavformat]] API is the interface of FFmpeg that is responsible for splitting apart encoded audio and video data from multimedia files (demuxing) and putting it together in new multimedia files (muxing). While [[libavcodec]], (the FFmpeg component that encodes and decodes audio and video data), enjoys [http://ffmpeg.mplayerhq.hu/projects.html widespread use among an impressive array of multimedia projects] libavformat has not seen the same level of adoption. These tasks should entail investigating how to improve the libavformat API, how it interacts with client applications and input layers, developing proof of concept code for a new API and working to port existing muxers and demuxers to the new API. Reorganizing  and refactoring FFmpeg [[libavformat]] module code so that each individual muxer/demuxer module can be easily enabled and disabled at compile time.
 
* Study the current specification and clarify what the issues are, putting it in a verbose and understandable form.
 
* Write a formal specification and roadmap of the new API and document the implementation.
 
* DocBook, rst, or doxygen for the code documentation steps
 
  
== Microsoft DirectShow and DirectX and MediaFoundation==
 
=== Native DirectShow support ===
 
Option to build FFmpeg decoder/encoder/demuxer/muxer and post-processing filters for the DirectShow API for Windows by Microsoft, (the native DirectX 8/9 Direct3D overlay for video playback), so that FFmpeg has native support to be compiled for DirectShow and thus be used directly by players that use DirectShow. It should be noted that there are already one very popular fork of FFmpeg available that has native DirectShow support and that is '''[http://en.wikipedia.org/wiki/Ffdshow FFdshow]''', (a other DirectShow implementation of FFmpeg is available as "'''drffmpeg'''" which is part of the '''[http://sourceforge.net/projects/drdivx/ DrDivX]''' project).
 
* DirectShow headers and compiling support http://en.wikipedia.org/wiki/DirectShow
 
** Specifications: http://msdn2.microsoft.com/en-us/library/ms783323.aspx
 
**http://msdn2.microsoft.com/en-us/library/ms788119.aspx
 
** Sources: http://sourceforge.net/projects/ffdshow-tryout/
 
*Native GUI for codecs/filter configuration like FFDshow
 
**http://en.wikipedia.org/wiki/Ffdshow
 
** Sources: http://sourceforge.net/projects/ffdshow-tryout/ (FFdshow),
 
http://sourceforge.net/projects/drdivx/ (drffmpeg)
 
  
=== Native MediaFoundation support===
+
== Features ==
Microsoft Windows Vista™ has new audio (EVR) and audio (SAR) renderers that FFmpeg needs output modules for 
 
*Microsoft Media Foundation API usage for optimized digital media playback on Microsoft Windows Vista
 
** http://msdn2.microsoft.com/en-us/library/ms694197.aspx
 
** http://msdn2.microsoft.com/en-us/library/ms788119.aspx
 
** http://download.microsoft.com/download/5/b/9/5b97017b-e28a-4bae-ba48-174cf47d23cd/MED134_WH06.ppt
 
*Multimedia Class Scheduler Service (MMCSS) class
 
*Enhanced Video Renderer (EVR) class
 
*Streaming Audio Renderer (SAR) class
 
 
 
=== DirectX Video Acceleration (DXVA) ===
 
DirectX Video Acceleration (DXVA) 1.0 AND 2.0 support, (for GPU accelerated video decoding under Windows).<br>
 
Note! Native DirectShow support in FFmpeg is before DirectX VA (DXVA) video decoding support can be added!
 
* DXVA 1.0 (DirectX SDK) specifications: http://msdn2.microsoft.com/en-us/library/ms798379.aspx
 
** http://en.wikipedia.org/wiki/DXVA
 
* DXVA 2.0 (Windows SDK) specifications: http://msdn2.microsoft.com/en-us/library/ms788119.aspx
 
http://download.microsoft.com/download/5/b/9/5b97017b-e28a-4bae-ba48-174cf47d23cd/MED134_WH06.ppt
 
  
== Features ==
+
* Improved existing documentation and add additional means to document
*  Create a new audio API system
 
*  radix-4 fft routines
 
*  Grabbing from video devices under windows
 
** Apply this VFW capture patch http://lists.mplayerhq.hu/pipermail/ffmpeg-user/2006-December/005607.html
 
** Create a DirectShow patch
 
*  -[h|v]flip options for ffplay
 
* Improved exition documentation and add additional means to document
 
 
**Web
 
**Web
 
**WIKI
 
**WIKI
 
**manpage
 
**manpage
* Add XING and/or VBRI header parsing support to the MP3 decoder/parser (for VBR encoded audio files)
 
**Possibly port code from this MPlayer patch: http://lists.mplayerhq.hu/pipermail/mplayer-dev-eng/2007-March/050609.html
 
* Add GAIN ([http://mp3gain.sourceforge.net MP3Gain]) header parsing support to the MP3 decoder/parser
 
** Also add GAIN ([http://mp3gain.sourceforge.net AACGain]) header parsing support to the AAC decoder/parser
 
 
== Subtitles ==
 
*  Create a common 'subtitles parser library' (and/or an API system for adding support for additional subtitle formats?) - a common sub-library to FFmpeg with all subtile decoders/demuxers/parsers gathered (similar to the libpostproc and libavutils). Call it "libsubs" (or "libsub", "libsubtitles" or whatever). Move FFmpeg's existing VobSub and DVBsub code there, so no matter if they are bitmap or text-based subs all existing and future subtile code is collected there. This will help reduce future code replication by sharing common code, thus making it easier to add support for additional subtitles.
 
**Maybe use MPlayer's recently added "'''libass'''" (SSA/ASS subtile reader) as a base for such a common library?
 
* Support for advanced SSA/ASS rendering
 
**Possible source are libass or the asa library
 
* Support bold, italic, underline, RGB colors, size changes and font changes for a whole line or part of one line
 
* [http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=284541 Line 23 signal (a.k.a. "Wide-screen signal")] detecting and use for DVD-Video (VobSub)
 
* Support for the subtitles HTML tags
 
* Capability of displaying subtitles with no video enabled (for example for audio-books)
 
* Support for Karaoke subtitles (for kar and cdg, etc.)
 
* Dual-subtitle-display (display two subtitles/languages at the same time, one at the bottom as normal plus one at the top of the screen)
 
* Capability of moving the subtitles in the picture (freetype renderer)
 
*Support more subtitle formats (text and bitmap-based):
 
**  [http://en.wikipedia.org/wiki/Closed_captioning Closed captioning (CC)] subtile support - (Closed captions for the deaf and hard of hearing, also known as "Line 21 captioning", uses VobSub bitmaps)
 
***[http://www.xinehq.de xine] have a SPU decoder for subpictures and Closed Captions software decoding
 
**  DirectVobSub (VSFilter) - standard VobSubs (DVD-Video subtitles) embedded in AVI containers
 
**  [http://en.wikipedia.org/wiki/DivX#DivX_Subtitles_.28XSUB.29 DivX Subtitles (XSUB)] display/reader/decoder (Note: bitmap based subtitle, similar to VobSub)
 
**  [http://en.wikipedia.org/wiki/SubRip SubRip (.srt)] subtile support (Note: simple text-based based subtitle with timestamp)
 
**  Subviewer (.sub) subtile support (Note: simple text-based based subtitle with timestamp)
 
**  MicroDVD (.sub) subtile support (Note: simple text-based based subtitle with timestamp
 
**  [http://en.wikipedia.org/wiki/Sami_%28subtitle_tool%29 Sami (.smi)] subtile support (Note: simple text-based based subtitle with timestamp)
 
**  [http://en.wikipedia.org/wiki/SubStation_Alpha SubStation Alpha (.ssa+.ass)] subtile support (Note: advanced text-based based subtitle with timestamps and XY location on screen)
 
**  [http://en.wikipedia.org/wiki/Synchronized_Multimedia_Integration_Language RealText (.rt)] subtile support
 
**  PowerDivx (.psb) subtile support
 
**  [http://en.wikipedia.org/wiki/Universal_Subtitle_Format Universal Subtitle Format (.usf)] subtile support
 
**  Structured Subtitle Format (.ssf) subtile support
 
 
 
== Misc ==
 
* Add a aac parser so -acodec copy to mp4/mov will work
 
* Clean up the h263 rtp patch found on this page: http://www.salyens.com/downloads/index.html#ffmpeg-0.4.7
 
  
 
== Streaming Media Network Protocols ==
 
== Streaming Media Network Protocols ==
 
Streaming Media Network Protocols (client and server-side) improvements/enhancements and related ideas for new features/functions.
 
Streaming Media Network Protocols (client and server-side) improvements/enhancements and related ideas for new features/functions.
*  Create a common 'stream demuxer/parser library' for the client-side (and/or API for adding support for additional streaming formats?) - a LGPL'ed sub-library in FFmpeg with all stream demuxers/parsers gathered (similar to the libpostproc and libavutil). Call it "libstream" (or "stream" or whatever). Move FFmpeg's existing stream code there like HTTP and RTSP/RTP. This will help reduce future code replication by sharing common code, thus making it easier to add support for additional streaming formats. All togther making it super easy for audio/video players using FFmpeg to add all-in-one streaming support to their player.
+
*  Create a common 'stream demuxer/parser library' for the client-side to receive input streams (and/or API for adding support for additional streaming formats?) - a LGPL'ed sub-library in FFmpeg with all stream demuxers/parsers gathered (similar to the libpostproc and libavutil). Call it "libstream" (or "stream" or whatever). Move FFmpeg's existing stream code there like HTTP and RTSP/RTP. This will help reduce future code replication by sharing common code, thus making it easier to add support for additional streaming formats. All togther making it super easy for audio/video players using FFmpeg to add all-in-one streaming support to their player.
 
**Maybe use either [http://www.mplayerhq.hu MPlayer]'s "''stream''" library structure, [http://www.live555.com LIVE555], [http://curl.haxx.se cURL], or probebly the better [http://streaming.polito.it/client/library libnms] (from [http://streaming.polito.it/client NeMeSi]) as a base for such a common library?
 
**Maybe use either [http://www.mplayerhq.hu MPlayer]'s "''stream''" library structure, [http://www.live555.com LIVE555], [http://curl.haxx.se cURL], or probebly the better [http://streaming.polito.it/client/library libnms] (from [http://streaming.polito.it/client NeMeSi]) as a base for such a common library?
 
*Add support for additional streaming protocols (on the client side) and improve/enhance support for existing protocols:
 
*Add support for additional streaming protocols (on the client side) and improve/enhance support for existing protocols:
Line 225: Line 70:
 
** SDP (Service Discovery Protocol) / SSDP (Simple Service Discovery Protocol)  client
 
** SDP (Service Discovery Protocol) / SSDP (Simple Service Discovery Protocol)  client
 
** MMS (Microsoft Media Services) client
 
** MMS (Microsoft Media Services) client
 +
*** including the subprotocol mmsh (MMS over HTTP) and mmst (MMS over TCP)
 
*FFServer (streaming server) updating and improving:
 
*FFServer (streaming server) updating and improving:
 
**FFServer code hasn't been update for quite a while
 
**FFServer code hasn't been update for quite a while
Line 237: Line 83:
 
**Streaming to clients like WMP 9, 10 and 11 is broken
 
**Streaming to clients like WMP 9, 10 and 11 is broken
 
**MMS server streaming support in FFServer, (especially for Linux).
 
**MMS server streaming support in FFServer, (especially for Linux).
***Note that al3x has gotten something working with ffserver, you might want to ask him what needs to be done as well :) --[[User:Compn|Compn]] 14:22, 19 March 2007 (EDT)
+
*** including the subprotocol mmsh (MMS over HTTP) and mmst (MMS over TCP)
 +
*** Note that al3x has gotten something working with ffserver, you might want to ask him what needs to be done as well :) --[[User:Compn|Compn]] 14:22, 19 March 2007 (EDT)
 
***You should also take a look at the [http://streaming.polito.it/server FENG (RTSP Streaming Server)] code, [http://streaming.polito.it/embedded NetEmbryo (Embedded Open Media Streaming Library)], and also [http://curl.haxx.se cURL]  --[[User:Gamester17|Gamester17]] 11:20, 29 March 2007 (GMT+1)
 
***You should also take a look at the [http://streaming.polito.it/server FENG (RTSP Streaming Server)] code, [http://streaming.polito.it/embedded NetEmbryo (Embedded Open Media Streaming Library)], and also [http://curl.haxx.se cURL]  --[[User:Gamester17|Gamester17]] 11:20, 29 March 2007 (GMT+1)
 
== Audio and video (pre-process/post-process) filters ==
 
FFmpeg's already well-known [[libavcodec]] module has become the de facto standard library for video decoding and encoding in free software projects. Unfortunately, no similar standard library has surfaced for audio/video filtering and otherwise working with audio/video stream once it has been decoded. Various multimedia projects (such as MPlayer, Xine, GStreamer, VirtualDub, etc.) have implemented their own filter systems to various degrees of success. What is needed is a high quality audio and video filter API - efficient, flexible enough to meet all the requirements which have led various projects to invent their own filter system, and yet easy to use or develop new filters with. This proposal is to implement a high quality audio/video filter library for FFmpeg, where it can be easily used by other multimedia-related software projects.
 
 
''Mentor: A'rpi (has expressed interest of possibly helping with implementing a filter API in FFmpeg, he also volunteering to help porting the MPlayer filters too if a such API becomes available http://lists.mplayerhq.hu/pipermail/mplayer-dev-eng/2007-April/051164.html)''
 
 
* Adopt MPlayer's A/V filter system or create a new API 'from scratch' for pre-process and post-process audio/video filters:
 
** See http://article.gmane.org/gmane.comp.video.ffmpeg.devel/39130 for michaelni's idea of what to do.
 
***Also read this discussion thread on MPlayer's mailing-list:
 
****http://lists.mplayerhq.hu/pipermail/mplayer-dev-eng/2007-April/051142.html
 
*****http://lists.mplayerhq.hu/pipermail/mplayer-dev-eng/2007-April/thread.html#51142
 
*** And, this one:
 
**** http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2007-January/020928.html
 
Where Michael Niedermayer wrote the following:
 
""
 
anyway if whoever designs the filter API decides to have a single audio+video
 
API then i certainly wont complain but until now _everyone_ has failed to
 
design a good video filter API, so adding yet another interdependancy
 
is probably not going to make that any easier
 
 
to repeat again some goals of a video filter API
 
* well documented (see mplayer for how not to do it)
 
* writing a filter should not require complete knowledge of all (undocumented) internals of the video filter system
 
* direct rendering (useing a buffer provided by the next filter)
 
* inplace rendering (for example adding some subtitles shouldnt need the  whole frame to be read and written)
 
* slices based rendering (improves cache locality, but there are issues with out of order decoding ...)
 
* multiple inputs
 
* multiple outputs (could always trivially be handled by several filters with just a single output each)
 
* timestamps per frame
 
* also th number of frames consumed by a filter does not have to match the number output ((inverse)telecine, ...)
 
 
also i suggest that whoever designs the filter system looks at mplayers
 
video filters as they support a large number of the things above
 
""
 
 
 
**Take a look at other eixsting players API for filter plugins, like for example;
 
*** [http://svn.mplayerhq.hu/mplayer/trunk/DOCS/tech/libmpcodecs.txt?revision=15625&view=markup MPlayer (libmpcodecs vf_*.c filters)], [http://xinehq.de/index.php/hackersguide#AEN864 Xine], [[ffdshow|FFdshow]], [[VLC media player|VLC]], [http://www.virtualdub.org/filtersdk VirtualDub], [http://gstreamer.freedesktop.org/data/doc/gstreamer/head/pwg/html/index.html GStreamer], [http://www.foobar2000.org foobar], and [http://www.xmms.org/ XMMS]
 
** Decide on name of a such A/V filter API.
 
*** libavfilter (conflicts with LAVF)? libavmunge?
 
* Create (or port) additional pre-process and post-process video filters to FFmpeg:
 
** General post-proc sources are [http://svn.mplayerhq.hu/mplayer/trunk/DOCS/tech/libmpcodecs.txt?revision=15625&view=markup MPlayer (libmpcodecs vf_*.c filters)], [http://xinehq.de/index.php/hackersguide#AEN864 Xine], [[ffdshow|FFdshow]], [[VLC media player|VLC]], [http://www.virtualdub.org/filtersdk VirtualDub], [http://gstreamer.freedesktop.org/data/doc/gstreamer/head/pwg/html/index.html GStreamer], [http://www.foobar2000.org foobar], and [http://www.xmms.org/ XMMS]
 
**More [http://en.wikipedia.org/wiki/Image_scaling image scaling] methods:
 
***[http://en.wikipedia.org/wiki/Linear_interpolation linear interpolation]
 
***[http://en.wikipedia.org/wiki/Bilinear_interpolation bilinear interpolation]
 
***[http://en.wikipedia.org/wiki/Cubic_interpolation cubic interpolation]
 
***[http://en.wikipedia.org/wiki/Bicubic_interpolation bicubic interpolation]
 
***[http://en.wikipedia.org/wiki/Trilinear_interpolation trilinear interpolation]
 
** Croping
 
** SSP (Statistical Post-Processing)
 
** DeBlocking
 
** DeRinging
 
** IVTC
 
** Sharpen / UnSharpen (Soften)
 
** ReQuantization
 
** Auto-Luminance
 
** Blurring / DeNoising / Spatial Blur / Temporal Blur
 
**  Deinterlace (weave AND bob) filters
 
*** Possible sources: [http://sourceforge.net/projects/deinterlace DScaler] or [http://www.mir.com/DMG/Software/y4mscaler.html y4mscale]?
 
** 2:3 pull-down / ivtc (inverse telecine) for 24 progressive-frames on 30 FPS TV's
 
*** Possible sources: [http://sourceforge.net/projects/deinterlace DScaler] or [http://www.mir.com/DMG/Software/y4mscaler.html y4mscale]?
 
** NTSC => PAL, and PAL => NTSC frame-rate (FPS) adjust and reclock filter for NTSC <=> PAL conversion
 
*** NTSC <=> PAL frame-rate adjust FPS ratios?: 23.97 <=> 25, 24 <=> 25, 30 <=> 25, 25 <=> 30
 
* Create (or port) additional pre-process and post-process audio filters:
 
** Psychoacoustic audio processing
 
** Artificial reverberation
 
** Dolby Prologic 2 decoding
 
** Audio re-sampler (sample rate converter) filter
 
*** Possible source is [http://www.mega-nerd.com/SRC/ SRC (Secret Rabbit Code)]
 
*Create a SDK (Software Development Kit) with templates for the a/v filter API
 
  
 
==See Also==
 
==See Also==
*[[Summer Of Code 2007|FFmpeg's Google SoC (Summer of Code) 2007 list of tasks]] for more suggestions/requests (ideas for developers).
+
*[[FFmpeg Summer Of Code]] for more suggestions/requests (ideas for developers).
*[[FFmpeg Summer Of Code|FFmpeg's Google SoC (Summer of Code) 2006 list of tasks]] for more suggestions/requests (ideas for developers).
 
 
*[http://bugzilla.mplayerhq.hu/buglist.cgi?query_format=specific&order=relevance+desc&bug_status=__open__&product=FFmpeg&content= FFmpeg bugs] for bugs in FFmpegs (codecs) that you can help fix or add addition information/samples to.
 
*[http://bugzilla.mplayerhq.hu/buglist.cgi?query_format=specific&order=relevance+desc&bug_status=__open__&product=FFmpeg&content= FFmpeg bugs] for bugs in FFmpegs (codecs) that you can help fix or add addition information/samples to.
*[[:Category:Formats_missing_in_FFmpeg]] for formats not implemented in ffmpeg yet
+
*[[:Category:Formats missing in FFmpeg]] for formats not implemented in ffmpeg yet
 +
 
 +
[[Category:FFmpeg]]

Latest revision as of 05:37, 4 October 2011

The various desired features for FFmpeg can be found in the following pages:

Also, other features requests can be found in:


See also the discussion about Audio API TODOs.




Old list

The following is deprecated, please do not add new items to this list, use instead the issue tracker. Also, send a message to the mailing list before implementing one of those items. They could be work-in-progress or not wanted anymore.

Moving any of these items to a proper feature request in the issue tracker is welcome.


Decoders

Demuxers

Muxers

  • DVB (MPEG-TS) muxer inside DVB containers
    • MPEG-1/2 video-streams inside DVB containers
    • MPEG-4 ASP video-streams inside DVB containers
    • MPEG-4 AVC (H.264) video-streams inside DVB containers
    • AC3 audio-streams inside DVB containers
      • Mutiple AC3 audio-streams inside DVB containers
    • MP3 audio-streams inside DVB containers
      • Mutiple MP3 audio-streams inside DVB containers
  • NSV muxer
  • NSA muxer


Features

  • Improved existing documentation and add additional means to document
    • Web
    • WIKI
    • manpage

Streaming Media Network Protocols

Streaming Media Network Protocols (client and server-side) improvements/enhancements and related ideas for new features/functions.

  • Create a common 'stream demuxer/parser library' for the client-side to receive input streams (and/or API for adding support for additional streaming formats?) - a LGPL'ed sub-library in FFmpeg with all stream demuxers/parsers gathered (similar to the libpostproc and libavutil). Call it "libstream" (or "stream" or whatever). Move FFmpeg's existing stream code there like HTTP and RTSP/RTP. This will help reduce future code replication by sharing common code, thus making it easier to add support for additional streaming formats. All togther making it super easy for audio/video players using FFmpeg to add all-in-one streaming support to their player.
    • Maybe use either MPlayer's "stream" library structure, LIVE555, cURL, or probebly the better libnms (from NeMeSi) as a base for such a common library?
  • Add support for additional streaming protocols (on the client side) and improve/enhance support for existing protocols:
    • HTTP (Hypertext Transfer Protocol) client
      • plus a SSL (Secure Sockets Layer) client support for HTTPS
    • UDP (User Datagram Protocol) client
    • RTSP - Real-Time Streaming Protocol (RFC2326) client
    • RTP/RTCP - Real-Time Transport Protocol/RTP Control Protocol (RFC3550) client
    • RTP Profile for Audio and Video Conferences with Minimal Control (RFC3551) client
    • RealMedia RTSP/RDT (Real Time Streaming Protocol / Real Data Transport) client
    • SDP (Service Discovery Protocol) / SSDP (Simple Service Discovery Protocol) client
    • MMS (Microsoft Media Services) client
      • including the subprotocol mmsh (MMS over HTTP) and mmst (MMS over TCP)
  • FFServer (streaming server) updating and improving:
    • FFServer code hasn't been update for quite a while
    • Support for RTSP interleaved RTP media
    • RTSP over HTTP tunneling
    • SLL (Secure Sockets Layer) support
    • TLS (Transport Layer Security) support
    • SCTP (Stream Control Transmission Protocol) support
      • including tunnel SCTP over UDP
    • Per-asset accounting options
    • Profiling and performance improvements of the RTSP, HTTP and RTP server code
    • Streaming to clients like WMP 9, 10 and 11 is broken
    • MMS server streaming support in FFServer, (especially for Linux).

See Also