[FFmpeg-trac] #10710(avcodec:new): Audio cracklings when decoding WAV PCM files with avcodec_receive_frame

[FFmpeg]

#10710: Audio cracklings when decoding WAV PCM files with avcodec_receive_frame
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             Reporter:  fabi78   |                     Type:  defect
               Status:  new      |                 Priority:  important
            Component:  avcodec  |                  Version:  6.0
             Keywords:           |               Blocked By:
             Blocking:           |  Reproduced by developer:  0
Analyzed by developer:  0        |
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 The bug concerns FFMPEG API, not ffmpeg program.

 To learn how to use FFMPEG API, I wrote a simple WAV file decoder (cf.
 attachment). It is inspired by tutorials online. The decoding is performed
 by the chain:
 av_read_frame -> avcodec_send_packet -> avcodec_receive_frame

 Then the content of frame->data is written without modification in an
 output file. When I read it with ffplay -f s16le -ac 2 -ar 44100, I hear
 cracklings, and when opening the file with Audacity in raw mode, I can see
 that some frames are "damaged" (some samples seem random).

 But if I wrote the data from the packet instead of the frame (which I can
 do as PCM is uncompressed), replacing "fwrite( pFrame->data " by "fwrite(
 pPacket->data" (at line 127), everything is fine.

 Have a good day.

 FM
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Ticket URL: <https://trac.ffmpeg.org/ticket/10710>
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