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For a fast "remux" (changing the container without losing quality), you can use this command if you have FFmpeg installed: ffmpeg -i 00004.mkv -codec copy 00004.mp4
To convert a file named 00004.mkv to the MP4 format, you can use several reliable methods depending on whether you want to use software on your computer or an online tool. Recommended Methods for Conversion
This is a free, high-quality way to change the container without re-encoding the video, preserving the original quality. Open OBS Studio . Go to File > Remix Recordings . Click the three dots ( ... ) to select your 00004.mkv file.
Services like Maestra AI , HappyScribe , and Vizard.ai allow you to upload an MKV or MP4 and receive an editable transcript or .srt subtitle file.
