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| author | Mark Himsley <mark@mdsh.com> | 2013-11-01 11:22:53 +0000 |
|---|---|---|
| committer | Vittorio Giovara <vittorio.giovara@gmail.com> | 2014-03-09 18:09:39 +0100 |
| commit | 360022bd3b894cc01ea112b275fa4c8f53881808 (patch) | |
| tree | 6381d53690d423d3d2b822d86247f534be5adb57 /LICENSE | |
| parent | db32f14c3dfd75290b57a086183d6577457beac4 (diff) | |
| download | ffmpeg-360022bd3b894cc01ea112b275fa4c8f53881808.tar.gz | |
isom: lpcm in mov default to big endian
It is my understanding that "Unless otherwise stated, all data in a
QuickTime movie is stored in big-endian byte ordering" [1] in MOV files.
I have a couple of thousand files, which technically are invalid because
their sound sample description element 4CC is 'lpcm' but its version is
0 - and "Version 0 supports only uncompressed audio in raw ('raw ') or
twos-complement ('twos') format" [2]
Because isom.c only contains a mapping for 4CC 'lpcm' to
AV_CODEC_ID_PCM_S16LE, these files have their audio decoded as LE when
it is actually BE.
This commit adds AV_CODEC_ID_PCM_S16BE as the first match for 4CC 'lpcm'.
[1]
https://developer.apple.com/library/mac/documentation/quicktime/QTFF/qtff.pdf
page 21
[2]
https://developer.apple.com/library/mac/documentation/quicktime/QTFF/qtff.pdf
page 178
Reviewed-by: Yusuke Nakamura <muken.the.vfrmaniac@gmail.com>
Diffstat (limited to 'LICENSE')
0 files changed, 0 insertions, 0 deletions