Can't encode VOB to MPEG-2

[radellaf]

With the mpeg2end DVD preset:

Encoding started on Tue May 13 17:00:50 EDT 2008
INFO: [yuvscaler] yuvscaler 1.9.0 (15-02-2004) is a general scaling utility for yuv frames
INFO: [yuvscaler] (C) 2001-2004 Xavier Biquard <xbiquard@free.fr>, yuvscaler -h for help, or man yuvscaler
INFO: [mpeg2enc] SETTING EXTENDED MMX for MOTION!
INFO: [mpeg2enc] SETTING SSE and MMX for TRANSFORM!
INFO: [mpeg2enc] SETTING EXTENDED MMX for PREDICTION!
movtoy4m
Copyright 2002-2006 Johan Lindström
All rights reserved..
ERROR: Could not open movie: /Users/rad/Movies/VERONICA_MARS_S2_D5 Title 2.VOB
**ERROR: [yuvscaler] Could'nt read YUV4MPEG header!
**ERROR: [mpeg2enc] Could not read YUV4MPEG2 header: system error (failed read/write)!

Only happens with VOB source and MPEG-2 output. MPEG4->MPEG2 OK, VOB->MPEG4 no problem.

With the ffmpeg DVD preset:

FFmpeg version CVS, Copyright (c) 2000-2004 Fabrice Bellard
Mac OSX universal build for ffmpegX
libavutil version: 49.0.0
libavcodec version: 51.9.0
libavformat version: 50.4.0
Tue May 13 17:06:06 EDT 2008
Input #0, mpeg, from '/Users/rad/Movies/VERONICA_MARS_S2_D5 Title 2.VOB':
Duration: 00:42:00.5, start: 0.280633, bitrate: 5284 kb/s
Stream #0.0[0x1e0], 29.97 fps(r): Video: mpeg2video, yuv420p, 720x480, 9800 kb/s
Stream #0.1[0x20]: Subtitle: dvdsub
Stream #0.2[0x21]: Subtitle: dvdsub
Stream #0.3[0x80]: Audio: ac3, 48000 Hz, stereo, 192 kb/s
Codec type mismatch for mapping #0.1 -> #0.1

[aedipuss]

you shouldn't have to encode a vob to mpeg-2. it already is. either use something like vob2mpg or demux to vid, aud, and subs.

[radellaf]

You want to re-encode VOBs to MPEG-2 when trying to re-encode the file at a lower bitrate. I want to combine the contents of a couple of DVDs onto one, and suffer whatever quality loss that might entail. (on a 7" portable's screen, it doesn't matter much)

VOB2MPEG... two problems:

1-- It's for Windows.
2-- Can't, like ffmpegX's [mencoder] modes, read VIDEO_TS folders without needing single-VOB extraction first.

There are some commercial apps that do DVD re-encodes, but I would like more control...and less cost. There are other tools to read VIDEO_TS folders, but since mencoder CAN do it, it would be nice to be able to just use what's already there.

[tomlee59]

Don't re-encode. Requantise/requantize instead. You'll get better results, and requantisation is much much faster than re-encoding.