Here, the x264 codec with the fastest possible encoding speed is used. $ ffmpeg -f x11grab -video_size 1920x1080 -framerate 25 -i $DISPLAY -f alsa -i default -c:v libx264 -preset ultrafast -c:a aac screen.mp4 To take a screencast screen.mp4 with lossy encoding and with audio: Here, the Huffyuv codec is used, which is fast, but produces huge file sizes. $ ffmpeg -f x11grab -video_size 1920x1080 -framerate 25 -i $DISPLAY -c:v ffvhuff screen.mkv To take a screencast screen.mkv with lossless encoding and without audio: Where -video_size specifies the size of the area to capture. $ ffmpeg -f x11grab -video_size 1920x1080 -i $DISPLAY -vframes 1 screen.png See FFmpeg encoding wiki and ffmpeg(1) § EXAMPLES.įFmpeg includes the x11grab and ALSA virtual devices that enable capturing the entire user display and audio input. However you may want to force the number of threads available by the parameter -threads number.
It is important that parameters are specified in the correct order (e.g.(I crashed my laptop once when trying to open a long sequence of full size renderings and GIMP wanted to eat 19 gb memory). Also loading many images in GIMP takes a lot memory or disk space if you don't have enough. Note that gifs quality is limited and they reach big file sizes pretty fast. You can also crop and rescale all images at once when opened in layers like described above.
A useful option to reduce filesize is to choose accumulated frame disposal in the dropdown below and check "Use disposal entered above for all frames".
Now you can set the delay between images (so inverse fps). A window will open, choose a filename with the ending.
To do this, change the name of these image layers and add (1000ms) behind it. For example you want to animate your gif with 10 fps (so 100 ms for each image) but the first and last image should show a second.
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