VOB to MP4 sometimes fails

[keithb1]

I have two DVDs which show different behaviour when I try to transcode them to mp4. One works fine, the other fails. I'm using the convert/save option on a Linux version of vlc. The one that fails will transcode OK to mpeg 2 (just changing the output file to X.mpg rather than X.mp4). Any idea why this might be?

The one that does not work has this error:
[0x8f2e8dc] main mux error: cannot add a new stream (unsupported while muxing to this format). You can try increasing sout-mux-caching value
[0x8dbb084] stream_out_transcode stream out error: cannot add this stream

[Rémi Denis-Courmont]

Whatever codec you use is not supported by the container format.

[keithb1]

It is the same codec in both cases. For one DVD it works, for the other it does not. Both DVD VOB files have identical "file" signatures.

Just to be clear, I used the standard built-in profile for MP4 in both cases.

[keithb1]

Whatever codec you use is not supported by the container format.

I assume you are referring to the output codec in which case it is the same for both (H.264)