On 12/12/15, Jean Delvare <jdelv...@suse.de> wrote: > Hi all, > > Can av_frame_is_writable() ever return 1, and if so, when? > > Context: I am testing corner cases of the delogo filter. To my > surprise, even for a simple test case such as: > > $ ffmpeg -f lavfi -i "color=color=white:size=24x24" -frames:v 1 -vf > "delogo=7:3:8:8" -f image2 debug.png > > av_frame_is_writable() returns 0, which disables direct mode of the > delogo filter and forces the allocation of a new buffer. My > understanding was that we were trying to avoid allocation and data copy > as much as possible, for performance reasons, and with such a simple > filter graph I can't see why we can't modify the video data in-place. > Can someone enlighten me?
Non-refcounted frames are never writable. And color source is made of one single frame which is cloned multiple times. Use different input file perhaps? > > Thanks, > -- > Jean Delvare > SUSE L3 Support > _______________________________________________ > ffmpeg-devel mailing list > ffmpeg-devel@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel > _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
