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--- record_desktop [2018/12/07 17:48]
+++ record_desktop [2021/04/05 11:23] (current)
@@ Line 1: / Line 1: @@
+====== Record Desktop ======
+ffmpeg can be used to record the desktop.
+    ffmpeg -f x11grab -s wxga -r 15 -i :0.0 -qscale 5  out.avi
+''wxga'' specifies the resolugion 1366 x 768.
+ffmpeg also supports cutting the video:
+    ffmpeg -i out.avi -ss 4 -t 00:02:07.0 -vcodec copy cut.avi
+The parameter ''ss'' skips the first x seconds. The parameter ''t'' specifies the duration in the format ''HH:MM:SS.sss''.
+Converting the video from avi to mpeg:
+    ffmpeg -i cut.avi -vcodec libx264 -preset veryslow -crf 0 transcoded.mp4
+Slow down or speed up recording:
+    mencoder -ovc copy -oac copy -speed .5 transcoded.mp4 -o transcoded-slow.mp4
+    ffmpeg -i transcoded.mp4 -vf setpts=2*PTS -an transcoded-slow.mp4
+Adding subtitle:
+    ffmpeg -i subtitle.srt subtitle.ass
+    ffmpeg -i transcoded-slow.mp4 -vf "ass=subtitle.ass" out.avi
+{{tag> linux}}