MP4 to MKV) without any transcoding – only by re-packaging (re-muxing) the same data in a different way. It is possible to convert files from one container format to another (e.g. (The actual video codec would be H.264 or HEVC or VP9 the audio would be AAC or Opus or MP3.) themselves are just container formats – they don't directly define how the video is compressed, only how it's packaged. You could even choose an 100%-lossless codec (if Premiere supports one), at the cost of massive output files.īut it's not clear whether you're actually looking for transcoding in the first place. You might be able to tune the codec to do its job much faster if you can deal with the output file being 10 times larger, for example.
And generally, the better a codec is at compressing video without being noticeably lossy, the more processing power it'll need and the longer it'll take. Transcoding is slow and lossy, because it literally means re-compressing the entire video frame by frame in the new format, the same way as when it was compressed in the first place.
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