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Situation: I did encoded a h.264 input_original.mkv file to h.265 output_hevc.mkv

After long encoding process I realise there are wrong audio streams was choose.

I need to get new output_hevc_2.mkv which would based on copy of video stream from output_hevc.mkv and maped audio streams from input_original.mkv

Is that technically possible?

P.s. I've seen this link ffmpeg-adding-re-encoding-audio-stream-on-video-file

It's not the same question because it'll generate new output file with video stream from input_original.mkv.

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    Check FFmpeg map option. Syntax without re-encoding: ffmpeg -i input0.mkv -i input1.mkv -map 0:v -map 1:a -c copy output.mkv Commented Nov 27, 2024 at 20:05
  • Thank you, question is solved, ffmpeg even much more powerful than I imagined Commented Nov 30, 2024 at 11:10

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In case of you need to specify a/v/s streams

ffmpeg -hide_banner \ -i "input_0.mkv" \ -i "input_1.mkv" \ -map 0:v:0 \ -map 1:a:0 \ -map 1:a:4 \ -map 0:s:0 \ -map 0:s:2 \ -c copy \ "result_output.mkv"

This will merge video stream from input_0.mkv and selected audio and subtitle streams from input_1.mkv to result_output.mkv

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