map 0 -codec copy -codec:s mov_text "%~pnF. map 0 -codec copy -codec:s mov_text output.mp4 \įor batch processing multiple files on a Windows box within cmd and overwriting existing files ( -y), use for: FOR /r %F IN (*.mkv) DO \ Therefore, a rather universal conversion command looks like this: $ ffmpeg -find_stream_info -i input.mkv \ FFmpeg doesnt have a stable built-in AAC encoder, so this command will just copy the audio stream in the same format to the output file. I shall assume that built configuration is not important to know ( -hide_banner) and only serious problems should be logged to the console ( -loglevel warning, alternatively: quiet | panic | fatal | error | warning | info ( default) | verbose | debug | trace).
This is activated with -find_stream_info, but I am not sure whether this should be used by default. ffmpeg -i 'vid.mkv' -codec copy -map 0 'MP4/vid.
Sometimes, adding missing information by using heuristics might help. I tried this command first which is supposed to be the fastest way to convert mkv to mp4. (You could also burn hard subtitles into a video stream with filters.) They can either simply be dropped with -sn or be converted to a native format like mov_text. Matroska files frequently contain subtitles in a format not supported in MOV/MPEG containers by FFmpeg, esp. MKV or AVI to MP4, with FFmpeg will only keep a single – it tries to choose the best one available – audio and video stream from the input file in the output file. Stack Exchange network consists of 182 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. ffmpeg -i filename.mkv -vcodec copy -acodec copy 1.mp4 Problem solved, specify the audio codec solve my problem.
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