[FFmpeg-trac] #3776(undetermined:open): Decoding bug when playing some MPEG-4 ALS streams

FFmpeg trac at avcodec.org
Thu Jul 17 18:06:47 CEST 2014

#3776: Decoding bug when playing some MPEG-4 ALS streams
             Reporter:  olderz       |                    Owner:
                 Type:  defect       |                   Status:  open
             Priority:  normal       |                Component:
              Version:  git-master   |  undetermined
             Keywords:  als          |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  1

Comment (by muken):

 The libavcodec's ALS decoder has the frame counter (frame_id) to omit the
 last extra samples.
 Unfortunately, this counter is reset to 0 when flushing buffers.
 And any demuxer can't access to reset the counter in the private data.
 So, the decoder can't omit last extra samples and makes a noisy sound when
 seeking to non-first frames.

 To resolve this issue, add any method to access the counter from the

Ticket URL: <https://trac.ffmpeg.org/ticket/3776#comment:6>
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