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ffmpeg - How to convert video to hls with selected audio ...
https://stackoverflow.com/questions/69446738/how-to-convert-video-to-hls-with-selected-audio-streams#:~:text=Most%20basic%20command%3A%20ffmpeg%20-i%20input.mkv%20-c%20copy,Or%20manually%20select%20the%20desired%20streams%20with%20-map.
FFmpeg: Choosing audio streams by language - Stack …
https://stackoverflow.com/questions/46769419/ffmpeg-choosing-audio-streams-by-language
Output stream 0:3 is a image-based subtitle stream. Since you've not specified an encoder for subtitles, ffmpeg is trying to pick one and fails since it doesn't have an image-based subtitle encoder. You can copy or drop the stream. Of course, your primary aim is to map only the audio stream by language. Your command will map the video twice, as ...
Convert specific video and audio track only with ffmpeg ...
https://superuser.com/questions/639402/convert-specific-video-and-audio-track-only-with-ffmpeg
The most simple map syntax you can use is -map i:s, where i is the input file ID and s is the stream ID, both starting with 0. In your case, that means we select track 0 and 4 : ffmpeg -i vidui.mkv -c:v libx264 -c:a ac3 -crf 20 -map 0:0 -map 0:4 vidui.mp4
ffmpeg - ffprobe select audio and video streams - Stack ...
https://stackoverflow.com/questions/41115917/ffprobe-select-audio-and-video-streams
a:1 for the audio packets belonging to audio stream with index 1; v:99 for the video packets belonging to video stream with index 99 and so on. Note that if you want to view 2 different streams (like audio and video) you need to run ffprobe twice. For more goodies, although very generally written, you can also check: https://trac.ffmpeg.org/wiki/FFprobeTips
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