So with -c you can control all the types of streams, whereas -acodec and -vcodec are just shortcuts for the audio or video subsets thereof. This is saying use the original codec for all the steams ( -c copy), but for the second video stream use libx264 ( -c:v:1 libx264), and for the 138th audio stream use libvorbis ( -c:a:137 libvorbis). So to put it all together consider this command from the docįfmpeg -i INPUT -map 0 -c copy -c:v:1 libx264 -c:a:137 libvorbis OUTPUT There is also a -vcodec that works the same way for video streams. Indicate that the stream is not to be re-encoded. ![]() Name of a decoder/encoder or a special value copy (output only) to codec codec (input/output,per-stream) Select an encoder (when used before an output file) or a decoder (when used before an input file) for one or more streams. acodec:1 is the same as -codec:a:1 and indicates you are setting the codec for the second audio stream (the first audio stream is 0). FFmpeg is a command line app, that's why you need a GUI (Graphical User Interface). We're listing here the latest builds of ffmpeg, compiled by different authors. We Intel Corporation April 2017 5 recommend using the release versions of FFmpeg. FFmpeg is a collection of different projects (libraries and tools) able to process multimedia content such as audio, video and subtitles. acodec is a subset of that functionality that automatically scopes to Audio streams Where to get FFmpeg with Intel® Quick Sync Video (Intel® QSV) updates Support for qsv codecs is included in FFmpeg 2.8 and newer, available from Development is active and updates are frequent. ![]() c or -codec is a generic stream selector, so you can use it to set the codec for any of the streams be they audio or video.
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