FFmpeg Wishlist

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Revision as of 07:05, 21 March 2007 by Merbanan (talk | contribs) (→‎Misc)
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Temporary FFmpeg wish/todo list:

Decoders

Encoders

  • Snow
    • 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
  • integrate speex, glue code or native


Demuxers

  • iff demuxer (with anim and sound decoding)
    • xine has a demuxer/decoder for iff
  • g723.1 / rtp demuxer
  • g729 / rtp demuxer
  • Bethsoft VID 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 copyrigthed 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

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

DirectShow and DirectX and MediaFoundation

Native DirectShow support

Decoder/encoder/demuxer/muxer and post-processing filter API for Windows by Microsoft

Native MediaFoundation support

  • Microsoft Media Foundation API usage for optimized digital media playback on Microsoft Windows Vista™
  • Multimedia Class Scheduler Service (MMCSS) class
  • Enhanced Video Renderer (EVR) class
  • Streaming Audio Renderer (SAR) class

DirectX Video Acceleration (DXVA) 1.0 AND 2.0 for GPU accelerated video decoding under Windows

Note! Native DirectShow support in FFmpeg is before adding DirectX VA (DXVA) video decoding support!

http://download.microsoft.com/download/5/b/9/5b97017b-e28a-4bae-ba48-174cf47d23cd/MED134_WH06.ppt

Features


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
  • 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):
    • Closed captioning (CC) subtile support - (Closed captions for the deaf and hard of hearing, also known as "Line 21 captioning", uses VobSub bitmaps)
      • xine have a SPU decoder for subpictures and Closed Captions software decoding
    • DirectVobSub (VSFilter) - standard VobSubs (DVD-Video subtitles) embedded in AVI containers
    • DivX Subtitles (XSUB) display/reader/decoder (Note: bitmap based subtitle, similar to VobSub)
    • 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
    • Sami (.smi) subtile support (Note: simple text-based based subtitle with timestamp)
    • SubStation Alpha (.ssa+.ass) subtile support (Note: advanced text-based based subtitle with timestamps and XY location on screen)
    • RealText (.rt) subtile support
    • PowerDivx (.psb) subtile support
    • Universal Subtitle Format (.usf) subtile support
    • Structured Subtitle Format (.ssf) subtile support


Misc

  • Add xing and/or vbri header parsing support to the mp3 decoder/parser
  • Add GAIN (MP3Gain) header parsing support to the MP3 decoder/parser
    • Also add GAIN (AACGain) header parsing support to the AAC decoder/parser
  • Add a aac parser so -acodec copy to mp4/mov works
  • 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

  • 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.
    • Maybe use either MPlayer's "stream" library structure, LIVE555, 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
    • 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


Audio and video (pre-process/post-process) filters

  • Adopt MPlayer's A/V filter system or create new one.
  • 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:
    • General post-proc sources are MPlayer (libmpcodecs vf_*.c filters) and FFdshow
    • SSP (Statistical-Post-Processing)
    • DeBlocking
    • DeRinging
    • Sharpen / UnSharpen (Soften)
    • ReQuantization
    • Auto-Luminance
    • Blurring / DeNoising
    • Deinterlace (weave AND bob) filters
    • 2:3 pull-down / ivtc (inverse telecine) for 24 progressive-frames on 30 FPS TV's
    • 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:


See Also