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preserve main video's aspect ratio
Source Link
Gyan
Gyan
  • 37.1k
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  • 106

Use

ffmpeg -i video1.mp4 -i video2.mp4 -filter_complex '[1][0]scale2ref[2nd][ref];[ref][2nd]vstack[vid]''[1][0]scale2ref=iw:ow/mdar[2nd][ref];[ref][2nd]vstack[vid]' -map [vid] -c:v libx264 -crf 23 -preset veryfast output.mp4

The vstack output pad hasn't been labelled, so the map won't refer to anything. Depending on your shell, you may need to quote the map value.

Use

ffmpeg -i video1.mp4 -i video2.mp4 -filter_complex '[1][0]scale2ref[2nd][ref];[ref][2nd]vstack[vid]' -map [vid] -c:v libx264 -crf 23 -preset veryfast output.mp4

The vstack output pad hasn't been labelled, so the map won't refer to anything. Depending on your shell, you may need to quote the map value.

Use

ffmpeg -i video1.mp4 -i video2.mp4 -filter_complex '[1][0]scale2ref=iw:ow/mdar[2nd][ref];[ref][2nd]vstack[vid]' -map [vid] -c:v libx264 -crf 23 -preset veryfast output.mp4

The vstack output pad hasn't been labelled, so the map won't refer to anything. Depending on your shell, you may need to quote the map value.

Source Link
Gyan
Gyan
  • 37.1k
  • 6
  • 64
  • 106

Use

ffmpeg -i video1.mp4 -i video2.mp4 -filter_complex '[1][0]scale2ref[2nd][ref];[ref][2nd]vstack[vid]' -map [vid] -c:v libx264 -crf 23 -preset veryfast output.mp4

The vstack output pad hasn't been labelled, so the map won't refer to anything. Depending on your shell, you may need to quote the map value.