TMPGEnc makes deep/slower sounding audio

[awesomer]

Does TMPGEnc have a problem where the audio of a DV-AVI will come out slow sounding? I'm trying to convert DV-AVI's from WinDV (also used DVIO, just in case) and audio sounds slowed down, yet it's not any longer than the video so I guess that's called pitch correction or somesuch. In any case, I was going to ask if it was a type-1 vs. type-2 avi problem, but I did two quick/short transfers from my miniDV camera (both types) and the audio came out fine. So, my new question is if it's a problem with the final output size of the m2v being greater than 4GB. The tests are about 7MB each.

edit: I'm trying a 4000MB encode right now to answer my own question, and I remembered that when I was checking things out after noticing the slow audio after a full encode that I would stop after 30 seconds of video to see if what I was doing to fix the problem was working. Definately not >4GB each of those times, but still slow audio. Just thought I'd add that info to the pile. The original files were in the 20GB range.

[awesomer]

The 4000MB encode finished, and it's slow audio city. Perhaps the size of the original is the issue?

[redwudz]

Depending on what version of TMPGEnc you are using, it's probably converting the audio to MPEG-1 Layer2. I don't use TMPGEnc to encode audio for DVD use anymore. I normally save out the audio and use ffmpeggui or Aften to convert to AC3 audio and let TMPGEnc just do the video. Then I add both in when I author.

But when I did use TMPGEnc for that, I never noticed any audio 'oddities'. You might want to check the encoder's audio settings. Something may be amiss there.

And welcome to our forums.

[awesomer]

Depending on what version of TMPGEnc you are using, it's probably converting the audio to MPEG-1 Layer2. I don't use TMPGEnc to encode audio for DVD use anymore. I normally save out the audio and use ffmpeggui or Aften to convert to AC3 audio and let TMPGEnc just do the video. Then I add both in when I author.

I downloaded the latest version and was doing PCM and I tried the mp2 option to see if that helped, but it didn't. How are you "saving out" the audio? I tried the audio out only option, but slow audio still. The slowness is also the preview thing before encoding, I noticed recently. I thought about using VirtualDub to get the audio, but sometimes I have to cut the edges off the video, so I'd have to direct stream copy to a new video file, too so the audio and video would match, but VD likes to take my video and remove whatever tells programs that my 720X480 should be 4:3.

Sidenote: Making a 320x240 video with VD from an original of 720x480 results in a larger file than the original. Odd.

[nTekka]

Its not really the type of audio codec you use. I think the problem is your frequency, check your DV source and see what frequency it is recording at, if it is 44.1Khz and you convert it to 48Khz (common for DVD and default setting) and vice versa, it may create a deep voice.

I've had this problem before and found this was the cause, changing the frequency back down to 44.1khz worked but less DVD compliant. So I had to look into the DV setting and switched it to 48khz instead of the default 44.1khz.

[redwudz]

I usually use VirtualDub and extract out the audio as a WAV with full processing, then convert that to AC3. As long as you don't change the length of the video or the audio, it should stay in sync. But I also edit or crop my DV with VirtualDub if needed, then frameserve just the edited video directly to TMPGEnc encoder from VD. That saves a fair amount of hard drive space.

[awesomer]

I think the problem is your frequency, check your DV source and see what frequency it is recording at, if it is 44.1Khz and you convert it to 48Khz (common for DVD and default setting) and vice versa, it may create a deep voice.
44.1khz.

I'll have to check to see why the small test files I made had no problem, but the 20GB sized ones did. If the problem is the 48 to 44 business, then VD is screwing with the sample rate based on file size.

[awesomer]

Okay, rock this on for size.

I recaptured the same tape from two different cameras. The only difference is that the Sony outputted with 32000Hz audio and the Canon outputted 48000Hz. File sizes are 23.5ish GB. I did a quick short encode of each and the Sony had non-slow sound. Who knows if it was perfect sound, given the problem, but it didn't sound slow. The Canon one (the one with 48000Hz audio) had slow sound. Does this help anyone figure out what the deal is? I don't really want to get all complex and fancy by doing what redwudz suggested.


sonyvscanon.bmp

^^^The picture is VirtualDub data.

[awesomer]

Okay, I went ahead and just used TMPGEnc for the video and VirtualDub for the audio output. Oddly, the audio comes out as 1 second shorter than the video, as reported by VD and MPC. But, I had the trial of Video Vegas 8 installed, so I loaded the audio into that and it says the audio takes up the exact same number of frames as VD says the video does. So, I'm gonna go with it and see what happens. What I really want to do is get on with learning about authoring DVD's instead of getting stuck worrying about if my audio is cheesed.