Stream #0.0: Video: rawvideo, bgra, 1366x768, 503562 kb/s, 15 tbr, 1000k tbn, 15 tbcįailed to set value 'ultrafast' for option 'preset:v'Īnother try: ~/Desktop » ffmpeg -f x11grab -r 15 -s 1366x768 -i :0.0 -sameq -vcodec libx264 -preset ultrafast test.mkvĭuration: N/A, start: 1357648985. Edit: By the way, if you want to scale to 8-bit, you should change the video filtergraph to. So you either have to build FFmpeg with support for scalenpp yourself or use software decoding.

Estimating duration from bitrate, this may be inaccurateĭuration: N/A, start: 1357648973.267658, bitrate: 503562 kb/s Scaling CUDA-frames depends on some Nvidia-software that cannot be freely distributed. Further information is available in the libvpx API documentation. To get more documentation of the libvpx options, invoke the command ffmpeg -h encoderlibvpx, ffmpeg -h encoderlibvpx-vp9 or vpxenc -help. This program is only provided for compatibility and will be removed in a future release. For the documentation of the undocumented generic options, see the Codec Options chapter. Trying to capture screen to video file encoded with lossless x264: ~/Desktop » ffmpeg -f x11grab -r 15 -s 1366x768 -i :0.0 -sameq -vcodec libx264 -preset:v ultrafast test.mkvįfmpeg version 0.8.4-6:0.8.4-0ubuntu0.12.10.1, Copyright (c) 2000-2012 the Libav developers

Ffmpeg h264 tune