[Wylug-discuss] Re: [Wylug-help] transcode, mpeg2enc and dvdauthor woes

[Douglas G Mckendrick]

reply underneath:
> Hi All,
> 
> Every now and then I try to hand-build DVD menus with dvdauthor.
> 
> Almost invariably I've been stumped by the same error message:
> 
>    'WARN: Skipping sector, waiting for first VOBU...'
> 
> Up until now, googling has never been much use, i.e. all the search results are
> simply other people pleading (unsuccessfully) for help with the same error.
> 
> Today I finally found a promising lead ...
> 
> $ man mpeg2enc reveals an option:
> 
>   -f 8 DVD MPEG-2 for 'dvdauthor'
> 
> This 'special' variation of DVD MPEG-2 apparently  "adds special dummy
> navigation packets into the output stream that the dvdauthor tool fills in to
> make a proper .VOB for authoring."
> 
> So now all I have to do is convert my standard DVD MPEG-2 files to dvdauthor
> format using mpeg2enc, extract the audio tracks, and remux the audio with the
> video, right?
> 
> It's not as straight forward as I'd hoped.
> 
> mpeg2enc seems to assume YUV input ... so I thought of using transcode to
> stream YUV to its own mpeg2enc export module 
> 
> ... no such luck!:
> 
>   [import_vob.so] v0.6.0 (2003-10-02) (video) MPEG-2 | (audio) MPEG/AC3/PCM | (subtitle)
>   [export_mpeg2enc.so] v1.1.10 (2003-10-30) (video) MPEG 1/2
>   [transcode] warning : (encoder.c) audio codec not supported by export module
>   [transcode] warning : failed to init export modules
>   [transcode] critical: plug-in initialization failed
> 
> Can anyone tell me whether this suggests that I'm using the wrong import module
> or that there is something wrong with my export module?
> 
> Alternatively, can anyone suggest a different tool/method for giving mpeg2enc
> the kind of input stream that it wants? 
> 
> Or simply a tool to convert existing VOBs to dvdauthor compatible VOBs?
> 
> Is it too fanciful to imagine a tool that simply 'blanks' the existing
> navigation packets in the vob so that dvdauthor can write over them, without
> any re-encoding or re-muxing?
> 
> Dave
Easy answer: use encode2mpeg.

encode2mpeg -o DVD source.mpg -mpeg -dvd -encode 0:0:1 -mpegonly

This will remultiplex the stream and should make it a valid mpeg for
dvdauthor.

If you do:
encode2mpeg -o DVD source.mpg -mpeg -dvd -encode 0:0:1 -imageonly

then also dvdauthor will be executed. Check that there are no errors
from dvdauthor.

Sometimex dvdauthor may show errors. In such case adding the option
-replex to
encode2mpeg should make everything ok.

The previous example assumes that the source mpeg is already a valid dvd
stream
(correct resolution/bitrate/audio-video/codec, etc). If that's not the
case you need to
reencode with the correct -encode option.

Complex answer: you need to remux the video/audio streams. The best tool
to use
is mplex. But you should learn how to use it correctly (demux the
streams first and
then remux them with appropriate options).

Giacomo