Record video/audio from screen

**J V** · August 26th, 2011

I'm trying to record video/audio from screen while playing a game.

xvidcap works very slowly and outputs the wrong framerate (Causing the video to seem speeded up) and doesn't record audio
recordmydesktop has had a bug for ages that causes it to cut off part of the video
ffmpeg's x11grab (My preference atm) produces a corrupted file, or doesn't record anything, the audio and video are both missing (Vlc shows a green picture, and totem throws a gstreamer error "(totem:27457): GStreamer-CRITICAL **: gst_pad_alloc_buffer_full: assertion `size >= 0' failed")
as vlc and mplayer are based on ffmpeg, those won't work either

I'm on debian, can someone help me get a screencapture working? (Preferably by ffmpeg)

My current attempt is:

Code:

ffmpeg -f alsa -ac 2 -i hw:0,0 -f x11grab -r 25 -s hd720 -i :0.0 -vcodec huffyuv -sameq out.avi

**ron999** · August 26th, 2011

Hi
There's a tutorial thread here:- http://ubuntuforums.org/showthread.php?t=1392026

**J V** · August 26th, 2011

Allright! Apparently huffyuv sucks

Current command is:

Code:

ffmpeg -f alsa -ac 2 -i hw:0,0 -f x11grab -r 25 -s hd1080 -i :0.0 -vcodec libx264 -vpre lossless_ultrafast -threads 0 -vf 'scale=-1:720' -sameq out.avi

Audio still doesn't work

(mp3 codec problem)

**J V** · August 26th, 2011

Ok, I so far have this:

Code:

ffmpeg -f alsa -ac 2 -i hw:0,0 -f x11grab -r 25 -s hd1080 -i :0.0  -vcodec libx264 -vpre lossless_ultrafast -threads 0 -vf 'scale=-1:720'  -acodec libmp3lame -sameq out.avi

No more errors, but I'm still not getting any sound (I get sound from webcam on different device input though)

I'm going to presume it's something I have muted in alsa, what could it be?

**dodle** · May 4th, 2012

I know this thread is old but I found a solution that works for me and wanted to share. Here is part of a script that I wrote:

Code:

nohup ffmpeg -y -f x11grab -r 30 -s 1280x800 -i :0.0 -sameq -vcodec libx264 /tmp/video.tmp.avi > /tmp/nohup$$.out 2>&1 &

P1=$!

ffmpeg -y -f alsa -i hw:0,0 -acodec libmp3lame -ac 1 -ar 44100 -ab 128k /tmp/audio.tmp.mp3
  
/bin/kill -s INT $P1
  
ffmpeg -i /tmp/video.tmp.avi -i /tmp/audio.tmp.mp3 -vcodec copy -acodec copy $1.avi

if [ "$?" -eq 0 ]
then
  rm /tmp/video.tmp.avi /tmp/audio.tmp.mp3
else
  echo "Muxing error, temporary files have not been deleted from /tmp"
fi