On 01/04/2016 10:34 PM, Hendrik Leppkes wrote:
On Mon, Jan 4, 2016 at 10:17 PM, Mats Peterson
<[email protected]> 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.
I have also removed some superfluous checks for the format/fourcc at the
very start of the private data for A_QUICKTIME and V_QUICKTIME. This
shouldn't happen, since the private data always starts with the sample
description size, *then* the format/fourcc, in a Matroska file.
Don't remove any existing checks, they usually get added based on actual files.
"Should not" does not mean "does not".
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Well, I almost expected that answer, Hendrik. Thanks. But a file with
the fourcc at the very start will break things later on. Hopefully these
files are very few ;)
Mats
--
Mats Peterson
http://matsp888.no-ip.org/~mats/
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