[FFmpeg-devel] [PATCH] avformat/framehash: print channel layout as a string instead of a hex value

James Almer jamrial at gmail.com
Thu Sep 29 02:18:20 EEST 2016

On 9/28/2016 8:09 PM, James Almer wrote:
> On 9/28/2016 7:35 PM, Michael Niedermayer wrote:
>> On Wed, Sep 28, 2016 at 07:23:37PM -0300, James Almer wrote:
>>> Numerical values for channel layout can be confusing and unintuitive, especially
>>> when no channel count is printed.
>> doesnt this break the format in libavformat/hashenc.c
>> for format_version=2 ?
> Yeah, it would break both versions 1 and 2, assuming anything tries to
> parse the hex value for some purpose, as both are expected to have it.
> And for that matter it would also break parsing framecrc in a similar
> fashion.

Then again, framecrc doesn't report any kind of version, so a standardized
output shouldn't be expected.

Ok if i make this version 3 for framehash/framemd5 then? I can also keep
the hex value, so something like

#channel_layout 0: 0x3 (stereo)

would be printed.

> This can be solved with a new version 3. But that only covers the
> muxers framehash and framemd5, and not framecrc as used by most fate
> tests, which also calls ff_framehash_write_header(), the function that
> prints this line.
> What would be the best course of action here?

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