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Ffmpeg mp4 flx aac aac bitstream error2/14/2024 ![]() ![]() ffmpeg -i input.mkv -c:v libx264 -crf 23 -c:a libfdk_aac -b:a 384k out.mp4 This encoder is not available in the static builds, but can be obtained with the pre-packaged / Homebrew versions of ffmpeg. ![]() ![]() 5.1 sound), you need to use another AAC encoder ( libfdk_aac). If your audio stream is using multiple channels (e.g. Here, for example, 500 kBit/s: ffmpeg -i input.mkv -c:v libx264 -crf 23 …įfmpeg -i input.mkv -c:v libx264 -b:v 500k …įor audio, you can set the bit rate too, with -b:a. You can also set a certain bit rate, depending on which file size you want. Try values between 19 and 26 to see what fits best. Lower means better quality, but higher file size. Then, in the simplest case run: ffmpeg -i input.mkv -c:v libx264 -c:a aac out.mp4įor controlling video quality, set the crf parameter, which defaults to 23. For macOS, you can install FFmpeg through Homebrew. For Windows and Linux, static builds are availabe from the homepage. Make sure you run the latest version of FFmpeg. ![]()
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