mkvs have less than 2 subtitle streams (and FFMPEG balks if I try to map metadata to a stream that doesn't exist). I would just do a manual -map_metadata for each stream, but I'm looking to do this in a batch file and some of the. I can't find a way to combine the two - if that makes sense! One Video 4 audio streams Many subtitles Chapters I want to re-encode one of the audio streams (the first one) and keep everything else as-of (copy). But if I manually map the metadata from the original audio 1 to the new audio 1, the metadata from the other tracks isn't carried across. How do I correctly map the metadata from the original file to the new one? If I use -map_metadata 0, the video, subtitle and audio 2 tracks have the correct metadata in the new file but the metadata from the original audio 1 (DTS) isn't copied over to the new audio 1 (AC3). I'm trying to replace the DTS track in each of these with a newly created AC3 (which I've mastered in another program) using FFMPEG to mux. I'm probably missing something simple, but here goes!
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