Need a easy/batch way to demux/normalize/mux DVD MPEG2 files

[jemenake]

The subject pretty much says it.

I've got a bunch of .mpg files that I've ripped directly from DVD's. I'm planning on batch-converting them all to DivX.... but.... I want to normalize their audio first.

Sure, I could do them one-at-a-time with a demux tool, then remember what I named the .m2a file, then run a normalize tool, remux, then go delete the old .m2a, .m2v, and original .mpg file... lather, rinse, repeat.... UGH!

Somebody must know of either some batch tool where I can drop all of my .mpg files into it or, at least, some set of command-line tools (even if they're in Linux) where I can automate the whole process.

Well?

[celtic_druid]

You can use bbdemux to batch demux.
mp3gain to batch process the mp2 audio.
No real need to remux if you are just going to convert.

Can't you just normalise as you convert?

[jemenake]

You can use bbdemux to batch demux.

Does it store the audio/video offset info in a way so that a remuxer or converter knows how to combine them at the end?

mp3gain to batch process the mp2 audio.

From what I can gather, mp3gain doesn't actually alter the audio data. It just adds a ReplayGain tag, no? http://mp3gain.sourceforge.net/faq.php#lossless) If so, that might not be sufficient if the DivX converter doesn't honor the ReplayGain tag.

No real need to remux if you are just going to convert.

Well.... I'd kinda like audio to go with my DivX video... so they'll have to be combined at some point, and I doubt that the DivX converter would handle it correctly if I just drug 20 m2v's and 20 m2a's into it and clicked "Convert".

Can't you just normalise as you convert?

The easiest way for me to convert them is to just drop them into the DivX6 Converter. It doesn't allow hardly any tweaking at all. Normally, this would bother me, but it's able to automatically select the values I want (and would forget to select with another transcoder) for so many settings, that the normalization problem is a minor problem in comparison.

- Joe[/url]

[celtic_druid]

Never used it on an mpg with audio delays. You might want to try DGIndex as I am pretty sure that when I have used it on VOB's it detects the delay.

It does both. Replygain is more accurate, but it works without it. Could also use a different app, but that would mean decoding to wav or converting directly to mp3 for muxing to your divx files.

So it doesn't accept seperate audio streams? Can't be a very flexible app then.

[jemenake]

So it doesn't accept seperate audio streams? Can't be a very flexible app then.

No... no it's not. But, it makes up for it in ease of use. Basically, I rip the DVD's straight to DVD-compliant MPEG2 files on a hard disk (goes so fast, I can do about 20 DVD's in an hour with two drives going). Then, I just drag all of the files into the converter, click "Convert" and go home. When I come back to work in the morning, I've got DivX6 versions of the DVD's which take up 1/10 of the space.

It seems to preserve the resolution of the source material and it also seems to detect the type of compression of the source (mpeg, indeo, cinepack, MPEG4, etc.) as well as the bitrate and is able to choose a DivX bitrate which is suited to it (ie, it doesn't lower the quality of the video, yet it doesn't waste space with an unnecessarily-high biterate, either).

So, it does exactly what I want... except for normalization. Which is why I'm asking for something that does it.

- Joe