But re-encoding video will be lossly and slow. Sometimes you might be able to keep the video but transcode (or re-download) just the audio. In these cases, the only way to make it work would be to transcode using a different codec. For example, if Premiere was incapable of decoding Opus audio, then it couldn't import Opus audio no matter if it's inside an MKV file or a WebM file. It is very likely that the problem with Premiere, too, lies not in the container, but in the specific codecs used. For example, as far as I know you cannot put Opus-encoded audio in an MP4 file, and "officially" you cannot put VP9 video in MP4 either.Īs a result some YouTube download tools deliberately generate MKV files because they have to – they need its greater flexibility regarding which codecs can fit in an MKV file, and either audio or video would need to be transcoded if you wanted to put it into MP4. This is always lossless and it's as fast as the computer can copy data, but only because it does not transcode anything.īut although I said the container formats don't directly define the codec, some of them are compatible only with certain codecs – sometimes for technical reasons, and sometimes just because the "codec ID" or other parameters haven't been agreed on yet. In FFMPEG you would do this using the special 'copy' codec, e.g. 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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