Skip to content

F
ffmpeg.wasm-core
Switch branch/tag
  1. 14 Aug, 2013 1 commit
  3. 08 Aug, 2013 1 commit
  5. 05 Aug, 2013 1 commit
  7. 10 Jun, 2013 1 commit
  9. 03 Jun, 2013 1 commit
  11. 02 Jun, 2013 1 commit
  13. 31 May, 2013 1 commit
  15. 23 May, 2013 1 commit
  17. 22 May, 2013 1 commit
  19. 18 May, 2013 1 commit
  21. 17 May, 2013 1 commit
  23. 10 May, 2013 2 commits
  25. 22 Apr, 2013 2 commits
  27. 18 Apr, 2013 1 commit
    • Clément Bœsch's avatar
      subtitles: introduce ASS codec id and use it. · 7c1a002c
      Clément Bœsch authored 
      Currently, we have a AV_CODEC_ID_SSA, which matches the way the ASS/SSA
markup is muxed in a standalone .ass/.ssa file. This means the AVPacket
data starts with a "Dialogue:" string, followed by a timing information
(start and end of the event as string) and a trailing CRLF after each
line. One packet can contain several lines. We'll refer to this layout
as "SSA" or "SSA lines".

In matroska, this markup is not stored as such: it has no "Dialogue:"
prefix, it contains a ReadOrder field, the timing information is not in
the payload, and it doesn't contain the trailing CRLF. See [1] for more
info. We'll refer to this layout as "ASS".

Since we have only one common codec for both formats, the matroska
demuxer is constructing an AVPacket following the "SSA lines" format.
This causes several problems, so it was decided to change this into
clean ASS packets.

Some insight about what is changed or unchanged in this commit:

  CODECS
  ------

  - the decoding process still writes "SSA lines" markup inside the ass
    fields of the subtitles rectangles (sub->rects[n]->ass), which is
    still the current common way of representing decoded subtitles
    markup. It is meant to change later.

  - new ASS codec id: AV_CODEC_ID_ASS (which is different from the
    legacy AV_CODEC_ID_SSA)

  - lavc/assdec: the "ass" decoder is renamed into "ssa" (instead of
    "ass") for consistency with the codec id and allows to add a real
    ass decoder. This ass decoder receives clean ASS lines (so it starts
    with a ReadOrder, is followed by the Layer, etc). We make sure this
    is decoded properly in a new ass-line rectangle of the decoded
    subtitles (the ssa decoder OTOH is doing a simple straightforward
    copy). Using the packet timing instead of data string makes sure the
    ass-line now contains the appropriate timing.

  - lavc/assenc: just like the ass decoder, the "ssa" encoder is renamed
    into "ssa" (instead of "ass") for consistency with the codec id, and
    allows to add a real "ass" encoder.

    One important thing about this encoder is that it only supports one
    ass rectangle: we could have put several dialogue events in the
    AVPacket (separated by a \0 for instance) but this would have cause
    trouble for the muxer which needs not only the start time, but also
    the duration: typically, you have merged events with the same start
    time (stored in the AVPacket->pts) but a different duration. At the
    moment, only the matroska do the merge with the SSA-line codec.

    We will need to make sure all the decoders in the future can't add
    more than one rectangle (and only one Dialogue line in it
    obviously).

  FORMATS
  -------

  - lavf/assenc: the .ass/.ssa muxer can take both SSA and ASS packets.
    In the case of ASS packets as input, it adds the timing based on the
    AVPacket pts and duration, and mux it with "Dialogue:", trailing
    CRLF, etc.

  - lavf/assdec: unchanged; it currently still only outputs SSA-lines
    packets.

  - lavf/mkv: the demuxer can now output ASS packets without the need of
    any "SSA-lines" reconstruction hack. It will become the default at
    next libavformat bump, and the SSA support will be dropped from the
    demuxer. The muxer can take ASS packets since it's muxed normally,
    and still supports the old SSA packets. All the SSA support and
    hacks in Matroska code will be dropped at next lavf bump.

[1]: http://www.matroska.org/technical/specs/subtitles/ssa.html
      7c1a002c
  29. 11 Apr, 2013 2 commits
  31. 22 Mar, 2013 1 commit
  33. 17 Mar, 2013 1 commit
  35. 21 Jan, 2013 1 commit
  37. 14 Jan, 2013 2 commits
  39. 13 Jan, 2013 4 commits
  41. 06 Jan, 2013 2 commits
    • Carl Eugen Hoyos's avatar
      012v decoder. · 9ff92cf1
      Carl Eugen Hoyos authored 
      The decoder also supports a12v, but removes the transparency layer
since no samples with actual transparency are available for testing.
      9ff92cf1
    • Diego Biurrun's avatar
      Drop Snow codec · a0c5917f
      Diego Biurrun authored 
      Snow is a toy codec with no real-world use and horrible code.
      a0c5917f
  43. 03 Jan, 2013 1 commit
  45. 30 Dec, 2012 5 commits
  47. 28 Dec, 2012 1 commit
  49. 17 Dec, 2012 2 commits
  51. 07 Dec, 2012 1 commit
  53. 24 Nov, 2012 1 commit