#1767: 24bit audio in mov is flagged as 16bit in stsd atom
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Reporter: nichot20 | Owner:
Type: defect | Status: new
Priority: normal | Component: avformat
Version: git-master | Resolution:
Keywords: mov | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by nichot20):
Replying to [comment:3 muken]:
> According to qtff.pdf, when a sound sample description is version=1 or
2, sample size field shall be set to 16.
> So, it is not a bug.
> The actual sample size is placed more downward.
> Early sample size field shall be ignored by readers.
I note that both the original, and stream copied file have stsd version=0,
not the 1 or 2 you mention.
Looking at the code the value is set based upon the value of AV_CODEC_ID_*
when (version != 2) and comparison with the original file shows that
Quicktime Pro uses a value of 24.
The only other differences to the original file seems to be that QT Pro
adds in the extended version info which ffmpeg only adds for version 1
(line 672)
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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1767#comment:5>
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