Ho trovato le istruzioni per FFmpeg in questa pagina WEB:
http://www.divax.it/guide.asp?guida=Ffmpeg%20ReferencePurtroppo, il formato MTV non è supportato.
Per essere certo di aver usato correttamente FFmpeg, ho prima provato a convertire un file .mpg in .mp4, cosa che mi è riuscita. Il risultato non era un gran che; il video finale pareva assai più sgranato del video prima della conversione, ma la conversione avveniva! (vedi l'output qui sotto).
ut01@linux-d797:~> ffmpeg -i 20CambioDos.mpg 20CambioDos.mp4
FFmpeg version SVN-r16240, Copyright (c) 2000-2008 Fabrice Bellard, et al.
configuration: --shlibdir=/usr/lib --prefix=/usr --mandir=/usr/share/man --libdir=/usr/lib --enable-shared --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libfaad --enable-libfaac --enable-libxvid --enable-swscale --enable-postproc --enable-gpl --enable-vhook --enable-x11grab --enable-libschroedinger --enable-libdirac --enable-libgsm --enable-libx264 --enable-libamr-nb --enable-libamr-wb --enable-libdc1394 --enable-nonfree --enable-pthreads
libavutil 49.12. 0 / 49.12. 0
libavcodec 52. 7. 0 / 52. 7. 0
libavformat 52.23. 1 / 52.23. 1
libavdevice 52. 1. 0 / 52. 1. 0
libswscale 0. 6. 1 / 0. 6. 1
libpostproc 51. 2. 0 / 51. 2. 0
built on Dec 19 2008 20:43:48, gcc: 4.2.1 (SUSE Linux)
Input #0, mpeg, from '20CambioDos.mpg':
Duration: 00:00:19.58, start: 0.322511, bitrate: 3639 kb/s
Stream #0.0[0x1e0]: Video: mpeg2video, yuv420p, 720x576 [PAR 16:15 DAR 4:3], 9800 kb/s, 25.00 tb(r)
Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, s16, 192 kb/s
Output #0, mp4, to '20CambioDos.mp4':
Stream #0.0: Video: mpeg4, yuv420p, 720x576 [PAR 16:15 DAR 4:3], q=2-31, 200 kb/s, 25.00 tb(c)
Stream #0.1: Audio: libfaac, 48000 Hz, stereo, s16, 64 kb/s
Stream mapping:
Stream #0.0 -> #0.0
Stream #0.1 -> #0.1
Press [q] to stop encoding
frame= 492 fps= 40 q=31.0 Lsize= 969kB time=19.61 bitrate= 405.1kbits/s
video:806kB audio:151kB global headers:0kB muxing overhead 1.279613%
ut01@linux-d797:~>
Successivamente ho provato a convertire il medesimo file .mpg in .mtv, cosa che NON mi è riuscita (vedi l'output qui sotto).
ut01@linux-d797:~> ffmpeg -i 20CambioDos.mpg 20CambioDos.mtv
FFmpeg version SVN-r16240, Copyright (c) 2000-2008 Fabrice Bellard, et al.
configuration: --shlibdir=/usr/lib --prefix=/usr --mandir=/usr/share/man --libdir=/usr/lib --enable-shared --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libfaad --enable-libfaac --enable-libxvid --enable-swscale --enable-postproc --enable-gpl --enable-vhook --enable-x11grab --enable-libschroedinger --enable-libdirac --enable-libgsm --enable-libx264 --enable-libamr-nb --enable-libamr-wb --enable-libdc1394 --enable-nonfree --enable-pthreads
libavutil 49.12. 0 / 49.12. 0
libavcodec 52. 7. 0 / 52. 7. 0
libavformat 52.23. 1 / 52.23. 1
libavdevice 52. 1. 0 / 52. 1. 0
libswscale 0. 6. 1 / 0. 6. 1
libpostproc 51. 2. 0 / 51. 2. 0
built on Dec 19 2008 20:43:48, gcc: 4.2.1 (SUSE Linux)
Input #0, mpeg, from '20CambioDos.mpg':
Duration: 00:00:19.58, start: 0.322511, bitrate: 3639 kb/s
Stream #0.0[0x1e0]: Video: mpeg2video, yuv420p, 720x576 [PAR 16:15 DAR 4:3], 9800 kb/s, 25.00 tb(r)
Stream #0.1[0x80]: Audio: ac3, 48000 Hz, stereo, s16, 192 kb/s
Unable to find a suitable output format for '20CambioDos.mtv'
ut01@linux-d797:~>
Suggerimenti?