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I know how to transmux all streams in native FFMPEG, but sometimes some source encodings require me to use ffms2 plugin for AviSynth+. From the documentation, I assume that streams need to be selected manually there. ffms2's vtrack = -1, atrack = -1 only select one audio stream and audio stream, unlike -map 0:v -map 0:a -map 0:s and consequent -c:s mov_text, which copy all streams in native FFMPEG. Any help is appreciated.

HCLivess
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    I'm not sure AVS can output more than just A+V streams, so maybe you should process those streams separately, e.g. into a file, and then mux the results together in ffmpeg. – wOxxOm Sep 29 '22 at 08:45

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