[FFmpeg-devel] [PATCH v5 1/4 v3] lavf/avienc: Add support for palette side data

Mats Peterson matsp888 at yahoo.com
Fri Mar 4 22:12:41 CET 2016

On 03/04/2016 10:02 PM, Mats Peterson wrote:
> On 03/04/2016 09:52 PM, Mats Peterson wrote:
>> On 03/04/2016 08:44 PM, Michael Niedermayer wrote:
>>> On Fri, Mar 04, 2016 at 11:59:11AM +0100, Mats Peterson wrote:
>>>> On 03/04/2016 05:59 AM, Mats Peterson wrote:
>>>>> Removed some unused variables in AVIStream.
>>>> I would like to remind you of the fact that this patch (and the one
>>>> for riffenc.c) is needed for stream copying of Microsoft Video 1
>>>> (CRAM) in 8-bit mode, Microsoft RLE4 and Microsoft RLE8. There are
>>>> possibly more codecs using a palette, but these are the ones I can
>>>> come up with at the moment.
>>> i tried CRAM and MSRLE, but these already work when streamcopied
>>> before, do you have a testcase that does not work
>> It works, but only so much. On stream copy, it will only write the
>> palette after BITMAPINFOHEADER to the destination file. It won't write
>> any xxpc palette switching chunks to the file.
>> Mats
> The xxpc chunks come as palette side data.
> Mats

Try ffmpeg -i 8bpp_129.avi -vcodec copy test.avi, with and without the 
avienc.c and riffenc.c patch. The destination file will only contain 
xxpc chunks with my patch applied.


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