Issues with sampling/audio sampling/data rates and VdubMod

[Suprman37]

Alright, I'm assuming this is a common problem, but I didn't see any topics about it here. I'm combining movies using VDM and then using TMPGenc to convert them/burn them to DVD. Every now and then I'll run into a few movies that I can't join due to the sampling/audio/data rates. Sometimes I can use Super to fix the problem. Other times I can't.

Is there any way I can get around this issue, or another program that I can use that won't have these problems. Also, is there anything else out there that can streamline this process?

[AlanHK]

Avidemux often can join AVIs which VDub says it can't because of audio differences, though the spec seems the same. But if the audio sampling rate is truly different, I don't know how it would go.

In that case, perhaps you could join the AVIs using an AVS script, and adjust the sample rates there. Something like:

AviSource("a1.avi").EnsureVBRMP3Sync().SSRC(48000) ++\
AviSource("a2.avi").EnsureVBRMP3Sync().SSRC(48000) ++\
AviSource("a3.avi").EnsureVBRMP3Sync().SSRC(48000)
(Untested)

(See http://avisynth.org.ru/docs/english/corefilters.htm#audio )

[guns1inger]

If the problem is caused by VBR MP3 audio then try AVI Demux instead. The process is basically the same - load part one, append subsequent parts as required - however AVI Demux offers to build time maps for the audio to prevent sync problems. Say yes, let it do it's thinkg, then save the results out using Copy mode (same as Vdub's Direct Stream Copy) and you get a new file without re-encoding.

If the audio is substantially different, demux it, re-encode just the audio to match for both parts, remux and join.

[Suprman37]

In that case, perhaps you could join the AVIs using an AVS script, and adjust the sample rates there. Something like:

The problem I've had with AVS Scripts is they seem to make files too large for me to burn onto DVD. I was using FitCD and HC021 as an alternative to TMPGenc for a while, but I kept running into that problem.

Gunslinger, I don't think the problem is with VBR avis, as VDM handles those ok from what I've seen. I end up decompressing them before converting them to mpgs for DVDs, though.

I'm going to give AVIdemux a try.

[AlanHK]

In that case, perhaps you could join the AVIs using an AVS script, and adjust the sample rates there. Something like:

The problem I've had with AVS Scripts is they seem to make files too large for me to burn onto DVD. I was using FitCD and HC021 as an alternative to TMPGenc for a while, but I kept running into that problem.

AVS scripts simply display and filter AVI files. They don't output to any files.
Normally you use them as input to an encoder, wavi as I mentioned for audio, or VDub say, to make a new AVI, or HCEnc to make MPEG.

I use HCEnc to encode MPEG for DVDs. It gives a very precise estimate of the filesize when you select the bitrate (for normal 2-pass encoding; if you use Constant Q one-pass, the size is less predictable).
You can adjust either the final filesize to get the bitrate, or the desired filesize to determine the bitrate.
I use a rule of thumb of total m2v video 4 GB, which leaves a few hundred MB for audio and overhead.