Suppose you have a one-frame video file
ffmpeg -i picture.ppm -vcodec libx264 -preset placebo -tune stillimage -crf 25 -y picture.mkv
and want to view it.
Here is a imlib2 plugin that uses ffmpeg to decode the first frame of the given video.
imlib2-webp was used as a imlib2 loader sample.
Semi-static (ffmpeg compiled in) linux x86 version is here.
Little bonus: simple ffmpeg usage function:
/*
* Open the the file with FFmpeg, read the first video frame, convert it to RGBA image.
*
* returns malloc'ed buffer with the RGBA image on success and NULL on failure
*/
unsigned long* ffmpegsimple_readfirstframe(const char* filename, int *width, int *height);
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