![]() If you want to retain the DTS track too, use the -map flag. Things you can try (I put them in the order of my perceived quality, best first) ffmpeg -i input.mkv -c:v copy -c:a libfdk_aac -b:a 128k output.mp4įfmpeg -i input.mkv -strict experimental -c:v copy -c:a aac -b:a 192k output.mp4įfmpeg -i input.mkv -c:v copy -c:a libfaac -b:a 192k output.mp4 libfdk_aac will give you the best results, but due to this codec being non-free it's not always available. Which codec is available depends on how ffmpeg was compiled. ![]() There are multiple encoders available, all of them documented on the ffmpeg wiki. DTS is also indeed not supported, many MP4 video files contain two audio tracks, one DTS and one AAC. ![]() MP4 is indeed the best format for Apple devices and software.
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