![]() ![]() If you have mono, or want to down-mix to mono, use HE-AAC version 1. Note: HE-AAC version 2 only handles stereo. VBR modes gives roughly the following bit rates per channel ( details): 1 is lowest quality and 5 is highest quality. Target a quality, rather than a specific bit rate. ac 2 -c:a libfdk_aac -b:a 128k output.mp4 As a rule of thumb, for audible transparency, use 64 kBit/s for each channel (so 128 kBit/s for stereo, 384 kBit/s for 5.1 surround sound).Ĭonvert an audio file to AAC in an M4A (MP4) container:įfmpeg -i input.wav -c:a libfdk_aac -b:a 128k output.m4aĬonvert 5.1 surround sound audio of a video, leaving the video alone:įfmpeg -i input.mp4 -c:v copy -c:a libfdk_aac -b:a 384k output.mp4Ĭonvert the video with libx264, with a target of fitting a 90-minute movie on a 700 MB (=5734400 KB) CD-ROM, mixing the audio down to two channels (Windows users should use NUL rather than /dev/null and ^ instead of \):įfmpeg -y -i input.mp4 -c:v libx264 -b:v 933k -preset:v veryfast -pass 1 -an /dev/null
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