A more recent method can be found here.
This is based on this wonderful tutorial.
xwininfo
Click on the game window and fill in the uppercase info in the next line:
ffmpeg -f alsa -ac 2 -i pulse -f x11grab -r 30 -s WIDTHxHEIGHT -i :0.0+XPOSITION,YPOSITION -acodec pcm_s16le -vcodec libx264 -vpre lossless_ultrafast -threads 0 output.mkv
Now you have this video recorded! Time to compress it, for example like this:
ffmpeg -i output.mkv -acodec libmp3lame -ab 128k -ac 2 -vcodec libx264 -vpre slow -crf 22 -threads 0 our-final-product.mp4
Now upload to YouTube.
If the game you want to record is OpenGL, use GLC instead.
A more recent method can be found here.
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I can’t seem to capture sound using FFMPEG – any advice?
Do you use pulseAudio? I had to open pavucontrol and disable recording for all recording devices (microphones) and then it would record the desktop audio.
different sound mixer?
either way, its better to record video first, then audio.
It seems that recording of openGL does work with ffmpeg. Haven’t tried GLC yet.
Yeah, I often use it for opengl, when alsa isn’t available or when the card has no capture device in alsa.
GLC might be faster though/create less slowdown.
Unrelated: On your blog you show a youmouse. How much does it cost? On their current website there seems to be no cost info (unless adblock hid all the price shields away..)
There seems to be no price displayed.
I bought that Youmouse trackball for about 7 Euros (70 RMB) from the Taobao website (similar to Ebay in China) at that time. It was back then when I was living in Shanghai.
Recently I re-bought myself a Logitech Trackball as it’s still much more convenient and comfortable to use than the Youmouse.
BTW: you made a video from my game Tuxomania back then, if you remember :-)
I was looking for info on how to record games because I’m planning to make videos of it as I add features. Funnily enough when Googling this topic I landed on your blog :-)