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How to capture screen and audio in FFmpeg?
Once you’ve figured out the device index corresponding to the screen to be captured, use: ffmpeg -f avfoundation -i ” : ” output.mkv This will capture the screen from and audio from into the output file output.mkv.
What kind of encoder do I need for FFmpeg?
For the sake of brevity, these commands do not specify any additional encoder settings. For more info about H.264 encoding, see the H.264 encoding guide . By default, these commands will use the x264 encoder, which should be reasonably fast on modern machines. See Lossless Recording if you need to improve performance. Use the x11grab device:
What happens if you leave out probesize in FFmpeg?
If you leave out the probesize option, ffmpeg will, by default, set the probesize to 5M. max_interleave_delta option prevents ffmpeg forcing output. If ffmpeg forces output, a message will appear in your log, e.g.: [mp4 @ 00000199f7512040] Delay between the first packet and last packet in the muxing queue is 10007271 > 10000000: forcing output
How to limit to a region in FFmpeg?
If you want to limit to a region, and show the area being grabbed: To grab the contents of the window named “Calculator”: You can use hardware acceleartion to speed up encoding and reduce the load on your CPU. For example, with NVIDIA hardware encoding:
How many audio channels does FFmpeg claim to have?
I’m getting a video with 0 audio channels, which I can check running FFmpeg/ffplay output.mpeg and no audible sound is played. The position of -ac 2 doesn’t change the behaviour, nor does repeating it only once. This is despite ffmpeg claims to record the audio with 2 channels, here is the input:
Where do I find stereo mix in FFmpeg?
Before you can start, make sure ‘Stereo Mix’ shows up as a device under sounds. Download FFMPEG. You can add it to the PATH if you want but it isn’t necessary.