FFmpeg Wishlist

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A temporary FFmpeg wish/todo list:

Decoders

Demuxers

Features

Subtitles

  • Create a common 'subtitles parser library' (and/or API 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?
  • Closed captioning (CC) subtile support - (Closed captions for the deaf and hard of hearing, also known as "Line 21 captioning", uses VobSub bitmaps)
  • 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

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


A/V Filters