Why Split Aud and Vid?

[tmgrood]

Ok, im fairly new at this but why is it when people have an avi movie that theyve downloaded and want to convert to DVD, why do they split the audio and video if its already together in the movie.
Isnt it a risk to seperate the two and possibly make them out of sync with each other when converting?
Just curious.

[winifreid]

Some programs like Tmpgenc have problems with encoding audio in sync, so it is possible to encode seperately and then remux. There are some editing programs that can not deal with audio and video together so it is necessary to demux, edit and remux. It isn't always necessary, but it will often lead to better results. There are ways to make sure that the remux is in sync.

[jimmalenko]

Some programs like Tmpgenc have problems with encoding audio in sync, so it is possible to encode seperately and then remux. There are some editing programs that can not deal with audio and video together so it is necessary to demux, edit and remux. It isn't always necessary, but it will often lead to better results. There are ways to make sure that the remux is in sync.

To expand on this, a number of AVIs have VBR audio. TMPGEnc and VBR audio do not mix and often it results in a 1 hour movie producing a 6 hour MPEG file. You can save the audio as a separate stream and re-encode it to mp2 or ac3 or just leave it as WAV if you have the space. Most authoring programs can take the video and audio streams and remux them back together. As long as you don't change the duration of either stream, they will remain in sync.

[tmgrood]

Well usualy once I have the avi movie ready for encoding/transcoding, I just run it thru either Nero 6.3 or CCE or WinMPG (changing it to MPEG2) and burn it from there and for the most part they turn out pretty good.
But by reading alot of these posts it seems that people do alot of extra work and probably come out with just about the same results as mine.
Now of course when I have trouble with one, then I search and find out the best possible solution.
Anyway, have always been confused about the extra work.

[housepig]

I do it because I use ac3 audio in my finished dvds, and my mpeg encoder of choice (TMPG) doesn't have ac3 encoding capabilities.

[jimmalenko]

Well usualy once I have the avi movie ready for encoding/transcoding, I just run it thru either Nero 6.3 or CCE or WinMPG (changing it to MPEG2) and burn it from there and for the most part they turn out pretty good.
But by reading alot of these posts it seems that people do alot of extra work and probably come out with just about the same results as mine.
Now of course when I have trouble with one, then I search and find out the best possible solution.
Anyway, have always been confused about the extra work.

It used to be that case that the Nero encoding engine was shite, certainly with Nero 5.5 anyway. I don't know whether things have improved in Nero 6 or if it uses the same engine and tools as Nero recode. I learnt from the early days to use specialised, dedicated programs to do each task.

[ZippyP.]

But by reading alot of these posts it seems that people do alot of extra work and probably come out with just about the same results as mine.

I don't know if Nero has gotten any better, but if it hasn't then you have been getting inferior results if you use it to encode.