[FFmpeg-devel] [PATCH] fix muxing pcm in MOV when using avcodec_encode_audio()

[Andrew Wason]

Muxing pcm audio in MOV using avcodec_encode_audio() is failing
because avcodec_encode_audio() returns an incorrect packet size of 4
bytes. This can be reproduced by modifying the sample
ffmpeg/doc/examples/muxing.c to encode PCM, see attached patch
muxing-test.diff

I git bisected and commit 89ddff92a385 is the one that broke this. In
mov_write_header() if st->codec->frame_size <= 1 it sets it to 1. Then
avcodec_encode_audio() sets frame->nb_samples = avctx->frame_size, and
frame->nb_samples of 1 is used to compute a packet size of 4 bytes.

Attached patch mov-pcm-framesize.diff changes mov_write_header() to
leave st->codec->frame_size as is instead of forcing it to 1.

Andrew
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