[FFmpeg-user] Question about conversion (Transcoding)

[Carl Eugen Hoyos]

2018-09-18 18:50 GMT+02:00, JD <jd1008 at gmail.com>:
> I have an mpeg2 file which I am trying to convert to a dvd iso.
>
> I am using dvdauthor to do it.
> dvdauthor says the file is not mpeg2 video compatible.
>
> When I run ffprobe on the file, I get this
>
> ffprobe /usr/tmp/title_3-09h31m23s.mpg
> ffprobe version N-51556-ge278500 Copyright (c) 2007-2013 the FFmpeg
> developers
>    built on Apr  4 2013 05:11:43 with gcc 4.6 (Debian 4.6.3-1)
>    configuration: --prefix=/root/ffmpeg-static/32bit --arch=x86_32
> --extra-cflags='-m32 -I/root/ffmpeg-static/32bit/include -static'
> --extra-ldflags='-m32 -L/root/ffmpeg-static/32bit/lib -static'
> --extra-libs='-lxml2 -lexpat -lfreetype' --enable-static
> --disable-shared --disable-ffserver --disable-doc --enable-bzlib
> --enable-zlib --enable-postproc --enable-runtime-cpudetect
> --enable-libx264 --enable-gpl --enable-libtheora --enable-libvorbis
> --enable-libmp3lame --enable-gray --enable-libass --enable-libfreetype
> --enable-libopenjpeg --enable-libspeex --enable-libvo-aacenc
> --enable-libvo-amrwbenc --enable-version3 --enable-libvpx
>    libavutil      52. 24.100 / 52. 24.100
>    libavcodec     55.  2.100 / 55.  2.100
>    libavformat    55.  1.100 / 55.  1.100
>    libavdevice    55.  0.100 / 55.  0.100
>    libavfilter     3. 49.100 /  3. 49.100
>    libswscale      2.  2.100 /  2.  2.100
>    libswresample   0. 17.102 /  0. 17.102
>    libpostproc    52.  2.100 / 52.  2.100
> [mpeg @ 0xab1d7c0] max_analyze_duration 5000000 reached at 5024000
> microseconds
> [mpeg @ 0xab1d7c0] Could not find codec parameters for stream 1 (Audio:
> ac3, 0 channels): unspecified sample format
> Consider increasing the value for the 'analyzeduration' and 'probesize'
> options
> [NULL @ 0xab1e760] start time is not set in estimate_timings_from_pts
> Input #0, mpeg, from '/usr/tmp/title_3-09h31m23s.mpg':
>    Duration: 02:10:42.11, start: 45337.301611, bitrate: 5391 kb/s
>      Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x480 [SAR
> 32:27 DAR 16:9], 29.97 fps, 59.92 tbr, 90k tbn, 59.94 tbc
>      Stream #0:1[0x20]: Audio: ac3, 0 channels
>      Stream #0:2[0x80]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s
>
> So, how do I convert this file to a DVD compatible mpeg2 file?

Please try the following:
$ ffmpeg -i title_3-09h31m23s.mpg -target ntsc-dvd -acodec copy out.mpg

If it does not work, you can try to remove "-acodec copy".

Note that all dvd players I have seen also play the resulting
mpg file if I simply put it on a dvd (without using dvdauthor).

You could also test with "-acodec copy -vcodec copy" to
maximize quality.

Carl Eugen