[FFmpeg-devel] [WIP] Fix unnecessary memcpy in ffmpeg when libavfilter is enabled

[Alexander Strange]

On Nov 1, 2010, at 9:28 PM, Michael Niedermayer wrote:

> On Tue, Nov 02, 2010 at 02:23:45AM +0100, Stefano Sabatini wrote:
>> Hi all,
>> 
>> check this one. Again another big patch stack to climb before to reach
>> the top, and I suspect that there are problems with direct rendering
>> for some codecs, the given patches compile but then they fail
>> regressions (FFV1 and snow in particular).
>> 
> 
>> Also ffplay always crash when playing a FFV1 file, maybe someone can
>> have look at it.
> 
> its because the buffer is released before its returned
> 
> 
>> 
>> Also I wonder how should we fix the vflip+DR -> crash problem, if we
>> should enable codecs to work with reversed frames or if we should
>> inhibit direct rendering when hflipping is detected in the
>> filterchain.
> 
> CODEC_CAP maybe, but this needs more thought

Is there any situation where someone would want their video vflipped? I don't think it's worth keeping track of what supports negative stride.