7.4. Stream copying
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## 7.4. Stream copying

MEncoder can handle input streams in two ways: encode or copy them. This section is about copying.

- Video stream (option `-ovc copy`): nice stuff can be done :) Like, putting (not converting!) FLI or VIVO or MPEG1 video into an AVI file! Of course only MPlayer can play such files :) And it probably has no real life value at all. Rationally: video stream copying can be useful for example when only the audio stream has to be encoded (like, uncompressed PCM to MP3).

- Audio stream (option `-oac copy`): straightforward. It is possible to take an external audio file (MP3, WAV) and mux it into the output stream. Use the `-audiofile `filename`` option for this.

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