[FFmpeg-trac] #1965(avformat:open): mmf: support correctly formats ma-3/5/7

FFmpeg trac at avcodec.org
Sun Oct 18 08:06:22 EEST 2020


#1965: mmf: support correctly formats ma-3/5/7
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             Reporter:  ami_stuff   |                    Owner:
                 Type:  defect      |                   Status:  open
             Priority:  normal      |                Component:  avformat
              Version:  git-master  |               Resolution:
             Keywords:  adpcm smaf  |               Blocked By:
             Blocking:              |  Reproduced by developer:  1
Analyzed by developer:  1           |
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Changes (by zane):

 * analyzed:  0 => 1
 * cc: zane@… (added)


Comment:

 I've just had a look at the spec
 (http://read.pudn.com/downloads34/sourcecode/comm/mms/107584/SMAF3.06e.pdf),
 and I'm pretty sure what's being heard when the checks are removed is the
 "Score Track Stream PCM Data Chunk" (Mtsp) part of the MTR chunk.

 There's a bit of static at the start too, which suggests that's the rest
 of the chunk being decoded as adpcm.

 I'd be inclined to say the current behaviour is correct.

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Ticket URL: <https://trac.ffmpeg.org/ticket/1965#comment:7>
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