Что-то разобраться не могу. Есть файл 1
Input #0, avi, from '1.avi':
Metadata:
encoder : VirtualDubMod 1.5.10.2 (build 2540/release)
Duration: 00:24:10.53, start: 0.000000, bitrate: 2128 kb/s
Stream #0.0: Video: mpeg4, yuv420p, 704x396 [PAR 1:1 DAR 16:9], 23.98 tbr, 23.98 tbn, 23.98 tbc
Stream #0.1: Audio: mp3, 48000 Hz, stereo, s16, 128 kb/s
Stream #0.2: Audio: mp3, 48000 Hz, stereo, s16, 128 kb/s
Input #1, srt, from '1.srt':
Duration: N/A, start: 4.470000, bitrate: N/A
Stream #1.0: Subtitle: srt
ffmpeg -y -i 1.avi -i 1.srt ${opts} ./1.mp4 -map 0.0:0.0 -map 0.1:0.1 -map 1.0:0.2
Number of stream maps must match number of output streams