>>429
やってみた
$ ffmpeg -i org.avi -acodec copy -vcodec copy -atag 0xa106 bad.avi
$ ffprobe bad.avi
Input #0, avi, from 'bad.avi':
Metadata:
ISFT : Lavf52.64.2
Duration: 00:00:11.60, start: 0.000000, bitrate: 1727 kb/s
Stream #0.0: Video: h264, yuv420p, 640x360, 25 fps, 25 tbr, 25 tbn, 50 tbc
Stream #0.1: Audio: 0xa106, 48000 Hz, 2 channels, 122 kb/s
Unsupported codec (id=0) for input stream 1
$ ffmpeg -i bad.avi -acodec copy -vcodec copy -atag 0xff good.avi
$ ffprobe good.avi
Input #0, avi, from 'good.avi':
Metadata:
ISFT : Lavf52.64.2
Duration: 00:00:11.52, start: 0.000000, bitrate: 1740 kb/s
Stream #0.0: Video: h264, yuv420p, 640x360, 25 fps, 25 tbr, 25 tbn, 50 tbc
Stream #0.1: Audio: aac, 48000 Hz, stereo, s16, 122 kb/s
$