On 01/04/2016 10:49 PM, Mats Peterson wrote:
In many older QuickTime files, the audio format, or "fourcc", is
0x00000000 (AV_CODEC_ID_NONE). The QuickTime File Format Specification
states the following regarding this situation:
"This format descriptor should not be used, but may be found in some
files. Samples are assumed to be stored in either 'raw ' or 'twos'
format, depending on the sample size field in the sound description."
MPlayer handles this logic by itself, but FFmpeg/FFplay currently does
not.
Mats
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I'm still a bit afraid about the following construct for both
A_QUICKTIME and V_QUICKTIME. It could lead to false positives. The fact
is that the format/fourcc ALWAYS starts at offset 4 of the private data
in a Matroska file. Does anyone sit on a file where it does not?
if (ff_codec_get_id(ff_codec_movaudio_tags,
AV_RL32(track->codec_priv.data))) {
fourcc = AV_RL32(track->codec_priv.data);
codec_id = ff_codec_get_id(ff_codec_movaudio_tags, fourcc);
}
--
Mats Peterson
http://matsp888.no-ip.org/~mats/
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