[FFmpeg-trac] #6825(avformat:new): hlsenc muxer in fmp4 mode creates broken init.mp4 with ac3 surround sound input

[FFmpeg]

#6825: hlsenc muxer in fmp4 mode creates broken init.mp4 with ac3 surround sound
input
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             Reporter:  tmm1        |                    Owner:
                 Type:  defect      |                   Status:  new
             Priority:  normal      |                Component:  avformat
              Version:  git-master  |               Resolution:
             Keywords:              |               Blocked By:
             Blocking:              |  Reproduced by developer:  0
Analyzed by developer:  0           |
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Comment (by tmm1):

 Huh. I'm not sure about that DASH error. It seems like a different bug.

 For example, here is another command which works with DASH:

 {{{
 $ ffmpeg -i sample.mpg -c:v libx264 -c:a ac3 -f dash -use_timeline 1
 stream.mpd
 }}}

 And same variation with HLS:

 {{{
 $ ffmpeg -i sample.mpg -c:v libx264 -c:a ac3 -hls_segment_type fmp4
 stream.m3u8
 }}}

 But the init.mp4 generated by the HLS muxer is broken. But the init-
 stream1.m4s generated by DASH is correct.

 {{{
 $ ffmpeg -i init.mp4
    Stream #0:1(und): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, stereo,
 fltp (default)

 $ ffmpeg -i init-stream1.m4s
     Stream #0:0(und): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, 5.1(side),
 fltp (default)
 }}}

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Ticket URL: <https://trac.ffmpeg.org/ticket/6825#comment:4>
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