[FFmpeg-trac] #7646(undetermined:new): Loading Remote ffmpeg FMP4 HLS Streams Return Faulty Codec with Missing Pixel Format

[FFmpeg]

#7646: Loading Remote ffmpeg FMP4 HLS Streams Return Faulty Codec with Missing
Pixel Format
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             Reporter:  offek        |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  git-master   |               Resolution:
             Keywords:  hls          |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by gyk):

 I have run into the same problem. "partial file" is reported when a call
 to `avio_seek` reaches here:
 https://github.com/FFmpeg/FFmpeg/blob/n4.1.3/libavformat/aviobuf.c#L318.
 This is not due to "faulty codec parameters", but an unnecessary buffer
 reconfiguring operation on the non-seekable input stream. There is already
 a patch: https://patchwork.ffmpeg.org/patch/11744/ (not sure why it is
 suspended).

 Some other observations:

 - If you concatenate the initialization segment 'init.mp4' and a '.m4s'
 media segment together, and ask FFmpeg to pull the file via HTTP, then the
 file can only be correctly demuxed when the HTTP server supports range
 requests. Otherwise, a "partial file" error still occurs.
 - Interleaved MP4 can be demuxed successfully, because it doesn't trigger
 `ffio_set_buf_size` in `ff_configure_buffers_for_index`. Although the OP's
 command generates a non-interleaved MP4, the duration of the first '.m4s'
 is only 0.5 second, so it's effectively an interleaved one. After removing
 the first segment, you will encounter the same problem.

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Ticket URL: <https://trac.ffmpeg.org/ticket/7646#comment:4>
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