On Mon, Sep 28, 2020 at 12:31:49 +0000, Stub via ffmpeg-user wrote: > Let me give a much simplified example of what I hoped to achieve. I have two > movie files that each contain a video stream and an audio stream: movie1.mp4 > and movie2.mp4. I merge both into a single MKV container with ffmpeg: > > ffmpeg -i movie1.mp4 -i movie2.mp4 -map 0:v -map 0:a -map 1:v -map 1:a -c > copy combined.mkv > > At the end of the ffmpeg monitor output I get the following about the > contents of the "combined.mkv": > > Stream mapping: > Stream #0:0 -> #0:0 (copy) > Stream #0:1 -> #0:1 (copy) > Stream #1:0 -> #0:2 (copy) > Stream #1:1 -> #0:3 (copy)
In ffmpeg's stream mapping notation, the digits before the colon count the separate inputs (files or URIs) and outputs. > Now, my question is how to achieve the following mapping: > > Stream mapping: > Stream #0:0 -> #0:0 (copy) > Stream #0:1 -> #0:1 (copy) > Stream #1:0 -> #1:0 (copy) > Stream #1:1 -> #1:1 (copy) You can only achieve this by creating two output files, not a combined file. $ ffmpeg -i movie1.mp4 -i movie2.mp4 -map 0:v -map 0:a -c copy output1.mkv -map 1:v -map 1:a -c copy output2.mkv > It seems that the "-map" flag always adds a stream as a "#0:n". I > would like to have "#1:0" and "#1:1" in the "combined.mkv" container. > Is that possible? No. And to reiterate others' questions: What for? A single input file will always present itself to ffmpeg as "Input #0". If you want an additional "Input #1", give ffmpeg a second input file/URI. Again: If you map to a *combined* file, all output streams of the conversion process *need* to be "#0:N". Cheers, Moritz _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
