'-mapįile:index' specifies which input stream is used for each output Mapping from input stream to output streams:įfmpeg -i /tmp/a.wav -ab 64k /tmp/a.mp2 -ab 128k /tmp/b.mp2 -map 0:0 -map 0:0Ĭonverts a.wav to a.mp2 at 64 kbits and to b.mp2 at 128 kbits. * You can encode to several formats at the same time and define a * You can also do audio and video conversions at the same time:įfmpeg -i /tmp/a.wav -ar 22050 /tmp/a.mp2Ĭonverts a.wav to MPEG audio at 22050Hz sample rate. * You can set several input files and output files:įfmpeg -i /tmp/a.wav -s 640x480 -i /tmp/a.yuv /tmp/a.mpgĬonverts the audio file a.wav and the raw YUV video file a.yuv Of the Y plane followed by the U and V planes at half vertical and

Test.yuv is a file containing raw YUV planar data. You must specify the size of the image with the option They can be generated by all decent videoĭecoders. The Y files use twice the resolution of the U and V files. * FFmpeg can use any supported file format and protocol as input: 10 is the x-offset and 20 the y-offset for the grabbing.Ģ.3 Video and Audio file format conversion Have to set the audio recording levels correctly with aįfmpeg -f x11grab -s cif -i :0.0 /tmp/out.mpgĠ.0 is display.screen number of your X11 server, same asįfmpeg -f x11grab -s cif -i :0.0+10,20 /tmp/out.mpgĠ.0 is display.screen number of your X11 server, same as the DISPLAY environment Launching FFmpeg with any TV viewer such as xawtv Note that you must activate the right video source and channel before Video on the fly with a high quality polyphase filter.įFmpeg can grab video and audio from devices given that you specify the inputįfmpeg -f audio_device -i /dev/dsp -f video4linux2 -i /dev/video0 /tmp/out.mpg You usually only have to specify the targetįFmpeg can also convert from any sample rate to any other, and resize That FFmpeg tries to figure out all parameters that can possibly beĭerived automatically. The command line interface is designed to be intuitive, in the sense 8.2 Integrating libavcodec or libavformat in your programįFmpeg is a very fast video and audio converter.7.2.5 Crosscompilation for Windows under Cygwin.7.2.3 Cross compilation for Windows with Linux.2.3 Video and Audio file format conversion.FFmpeg Documentation FFmpeg Documentation

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