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For some obscure reason, I have some video files I downloaded from YouTube as FLV rather than in another format. I would like to re-mux them into, say, MKV (Matroska). When trying to use ffmpeg, I get a Unsupported video codec (7) message. What should I do?

I'd like to be able to do this both in a command-line tool and through a GUI but either is fine.

My OS for the purpose of discussion is Windows XP SP3.

einpoklum
  • 10,666

1 Answers1

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(as @slhck suggests:)

FFMPEG can indeed remux FLVs into MKVs, regardless of the codecs used. But - this functionality is (relatively) recent, so:

  1. Make sure you have an up-to-date version of FFMPEG. If you don't, download one from the official site (you might be referred off-site for Windows builds).
  2. Run X:\path\to\ffmpeg.exe -i input_file.flv -c copy output_file.mkv

And that should work.

einpoklum
  • 10,666