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Method 1: HandBrakeĬompatible with: Mac, Windows and Linux | Price: Free | Best for: Beginners transcoding video In this article we offer three simple methods to convert an MKV file into an MP4. Your best approach is to convert the MKV into a MP4, a file format which runs in almost all players.

There are options you can use (such as the ever-versatile VLC Player) to play MKV, but if you prefer to use a media player such as iTunes, QuickTime or Windows Media Player, you’ll find you can’t run an MKV without additional steps. But playing back the files in an MKV can be tricky, because support isn’t universal. Seems like this is specific to Matroska.MKV is an open-source container format that’s useful for storing multiple files using multiple encoding types many of us use the format when downloading and storing films and TV shows. The issue doesn't seem to crop up when going from other containers to an MP4, or when encoding directly to an MP4. Copy video stream to an MKV, then copy that stream to an MP4. If your FFmpeg isn't built with SVT-AV1 or libaom, I was also able to reproduce the issue by copying an existing AV1 file not authored with FFmpeg (as far as I know): ​. Furthermore, the mediainfo program will now report that the file is variable frame rate instead of constant (not sure how to check this with ffprobe).īuilt with gcc 8 (Ubuntu 8.4.0-1ubuntu1~18.04) Now to copy the freshly encoded video stream from the Matroska container to an MP4 container, and check out the frame rate:įfmpeg -i sintel.mkv -c:v copy sintel.mp4 & ffprobe -v error -select_streams v:0 -show_entries stream=avg_frame_rate -of default=noprint_wrappers=1:nokey=1 sintel.mp4 Wget & ffmpeg -i sintel_trailer-480p.mp4 -an -c:v libsvtav1 -t 10 -preset 8 sintel.mkv & ffprobe -v error -select_streams v:0 -show_entries stream=avg_frame_rate -of default=noprint_wrappers=1:nokey=1 sintel.mkvįrame rate is the same as the source (24/1). Summary of the bug: Copying some AV1 streams from an MKV container to an MP4 container changes the reported framerate and changes it from CFR to VFR.ĭownload the Sintel trailer, encode 10 seconds of it in AV1, print fps with ffprobe: