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this was so unintuitive, what special value?. but as you said, i have to detect the format first and then insert the found extension.įorce audio codec to codec. acodec copy means stream copy, or direct copy, or extraction of as it is. "makes fast" above means taking about 30 seconds for 2 hour long video, so i conclude this as a direct copy. Aa=ffmpeg.exe -i %1 -y -vn -acodec copy xxx.m4aĪa=ffmpeg.exe -i %1 -y -vn -acodec copy xxx.aacĬc=ffmpeg.exe -i %1 -y -vn -acodec copy xxx.mp3ĭd=ffmpeg.exe -i %1 -y -vn -acodec copy xxx.ac3Īa= makes xxx.m4a fast, but bit rate is fixed, plays in a little special audio playerīb= makes xxx.aac fast, but bit rate changes.
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