VOB to MPEG1 (mpeg2enc) Failure

[speedreader]

I'm trying to convert as above. I get about 90% of the way through, then I get the following at the end of a ginormous log (the rest not posted for space reasons... again LONG)

INFO: [mpeg2enc] Enc1 3812 3812( 8) P q=3.12 [1% Intra]
EOF code: 1
uninit video: libmpeg2
Exiting... (End of file)
INFO: [mpeg2enc] Enc1 3813 3813( 9) P q=3.45 [2% Intra]
INFO: [yuvscaler] End of stream!
INFO: [yuvscaler] Normal exit: end of stream with frame number 3816!
INFO: [mpeg2enc] Enc1 3814 3814(10) P q=3.14 [4% Intra]
INFO: [mpeg2enc] Signaling last frame = 3815
INFO: [mpeg2enc] Enc1 3815 3815(11) P q=2.44 [0% Intra]
INFO: [mpeg2enc] Sequence end inserted
INFO: [mpeg2enc] NEW GOP INIT length 12
INFO: [mpeg2enc] Guesstimated final muxed size = 53437634
wait, encoding to mp2 audio with mp2enc...
/Applications/ffmpegX.app//Contents/Resources/mencvcdX: line 213: /Users/mcbain/Desktop/WEDDINGSINGER/Wedsing//audiodump.wav: No such file or directory
INFO: [mplex] mplex version 1.9.0 (2.2.7 $Date: 2006/02/01 22:23:01 $)
**ERROR: [mplex] Unable to open file /Users/mcbain/Desktop/WEDDINGSINGER/Wedsing.mpa for reading.

Anyway, ffmpegx seems to create an mpv file just fine, but it doesn't even get around to writing the mpa file that it says it's not opening.

I've done some checking around the forum and haven't found anything of the like. I did try to convert to MPEG1 using ffmpeg but it resulted in a really choppy picture.

Any thoughts? FWIW, I can't seem to get mpeg2dec to work with any file. And I'm fairly sure I've got the most update version of everyhing.

Thanks

[tomlee59]

The error seems to say that it failed to find a proper audio track to encode in the first place. That's why it couldn't mux.

This can happen if you didn't specify the right audio track. This can also happen if you specified an audio track encoded with an unsupported codec.

Using, eg, VLC, play the original clip and investigate how many audio tracks there are, and how they're encoded. You may find that there's a choice that works. Or alternatively, it will give you a hint of what codecs need to be installed, if any.

One odd thing is the estimated final muxed size: ~50MB?? Seems tiny.

[speedreader]

Thanks for the reply.

I played the VOB in VLC. There is only one audio track, Track 1. The codec listed in the Information window is a52, which I am assuming is ac3.

The file size is small. I should have elaborated. The VOB file was just one chapter pulled from a DVD (using OSEx), not the entire title. So, I stripped the other audio and subtitle tracks and just have that single chapter.

The first time I tried to so any transcoding, I got nothing. Then I realized the audio and video were flipped and I checked "invert mapping" That got me through the clunky outsput with ffmpeg.

But I still fail if I used mpeg2enc (which I incorrectly called "mpeg2dec" in my original post)

[speedreader]

I should clarify one other thing. In the Information window, the audio is Stream 0 and the video Stream 1.

The "Track 1" I was referring to is from the menu (Audio > Audio Track > Track 1).

[tomlee59]

Did you select "decode with QT?" It might be the case that the ac3 codec you have can't handle that stream. This is especially likely if it is a 5.1 audio stream. If that's the problem, a possible solution is here: http://trac.cod3r.com/a52codec/

Hopefully, this will solve your problem.

[speedreader]

Not decoding with QT. I don't have the QT mpeg2 component. I was decoding with mencoder. Also, had no other problems with other files using the same audio codec.

[tomlee59]

Hopefully, you'll be able to find a clean solution. Absent that, here's a Plan B backup that I use whenever I'm desperate:

1) Use D-Vision3 to convert DVD to DivX.
2) Take the DivX produced by D-Vision and convert that (using ffmpegX, say) into the final format you want.

Although you necessarily introduce distortions of various kinds with this additional transcoding, use of a high enough bitrate will minimize it to acceptable levels. I use 2Mb/s for conversion to DivX for most general-purpose work; you can go up or down from there and see what meets with your approval.

[speedreader]

Thanks for the suggestion.

I might first try pulling the entire VIDEO_TS file from the DVD, then working with that. Maybe by pulling pieces with OSEx something funny is happening.