VBR in Avi files.

**BouncingSoul** · March 15th, 2006

So I want to cut certain ... uh ... parts from longer ... movies. Most of the movies I have are in VBR and virtual dub tells me the audio/video sync will be off by x amount unless I "decompress the ENTIRE audio stream and recompress at a constant bitrate." I've been doing that for a while but I'm kinda sick of it. Even on my 3.4 ghz cpu it takes around 2-4 hours depending on how high the video bitrate is. What I'm wondering is if there is an easier way to convert VBR to CBR and maintain the audio/video sync?

PS. Sorry if this is in the wrong forum

vertigo · March 15th, 2006

that warning is talking about the audio only, not the video! audio encoding should take no more than 20 min. please don't tell me you've been encoding CBR video, which horribly degrades quality!

anyway vdub does not handle vbr audio (although the latest has limited vbr support). use virtualdubmod instead, you will not have to reencode anything, just click "no" when it gives you the warning, it'll turn out fine

**BouncingSoul** · March 15th, 2006

I'd been seperating the video and wav audio and doing a recompress in either vdub or dr divx. I'll check the mod out and see what happens.

Thanks

**BouncingSoul** · March 15th, 2006

No luck with the mod. The audio and video are terribly out of sync when I try edit it out. I'll see if anything else works.

Reps for the effort.

vertigo · March 15th, 2006

its pretty much guaranteed to work, make sure you select "direct stream copy" mode for the video

**BouncingSoul** · March 15th, 2006

What I did this time is set the video to direct stream copy and set the audio to full processing mode and then I set it to recompress the audio using Lame @ 192 and looks like it worked. Took about 20 minutes like you said and I didn't have to redo the video. Awesome, many thanks!

vertigo · March 15th, 2006

we should be able to beat that, should only take seconds, or as fast as your hard disk can go.

when you open the avi file, click 'no' to the warning. set direct stream copy for video and audio (audio is set to direct stream copy by default anyway). select points you wish to cut at, save as avi

it'll just do a straight cut at the nearest keyframe and dump onto hard disk

**BouncingSoul** · March 15th, 2006

Originally Posted by vertigo

we should be able to beat that, should only take seconds, or as fast as your hard disk can go.

when you open the avi file, click 'no' to the warning. set direct stream copy for video and audio (audio is set to direct stream copy by default anyway). select points you wish to cut at, save as avi

it'll just do a straight cut at the nearest keyframe and dump onto hard disk

Doesn't work for me. I even tried another video splitter and it still spits out video that is around 5 seconds ahead of the audio.

vertigo · March 15th, 2006

hmm looks like the file in question hasn't been encoded too well...

dajm · January 18th, 2008

Originally Posted by vertigo

anyway vdub does not handle vbr audio (although the latest has limited vbr support). use virtualdubmod instead, you will not have to reencode anything, just click "no" when it gives you the warning, it'll turn out fine

This was some excellent advice when I tried to cut a segment out of a video with vbr audio, first time around I clicked "yes" when it asked for some reason (I'm not handy with anything that comes to video editing), but then I did as suggesten and clicked "no" when it asked and the audio was in perfect sync with the video. I am using VirtualDubMod, which is in itself just excellent. Thanks!

**fitz** · January 21st, 2008

old thread.. but the message was approved because it's always nice to give thanks.

March 15th, 2006	Top \| #1
BouncingSoul Stranger Than Fiction Joined: January 2004 Location: Sioux Falls, SD Posts: 1,289 Reputation: 877 Power: 122	VBR in Avi files. So I want to cut certain ... uh ... parts from longer ... movies. Most of the movies I have are in VBR and virtual dub tells me the audio/video sync will be off by x amount unless I "decompress the ENTIRE audio stream and recompress at a constant bitrate." I've been doing that for a while but I'm kinda sick of it. Even on my 3.4 ghz cpu it takes around 2-4 hours depending on how high the video bitrate is. What I'm wondering is if there is an easier way to convert VBR to CBR and maintain the audio/video sync? PS. Sorry if this is in the wrong forum

March 15th, 2006	Top \| #2
vertigo OSNN Senior Addict Joined: December 2005 Posts: 330 Reputation: 150 Power: 83	Re: VBR in Avi files. that warning is talking about the audio only, not the video! audio encoding should take no more than 20 min. please don't tell me you've been encoding CBR video, which horribly degrades quality! anyway vdub does not handle vbr audio (although the latest has limited vbr support). use virtualdubmod instead, you will not have to reencode anything, just click "no" when it gives you the warning, it'll turn out fine

March 15th, 2006	Top \| #3
BouncingSoul Stranger Than Fiction Joined: January 2004 Location: Sioux Falls, SD Posts: 1,289 Reputation: 877 Power: 122	Re: VBR in Avi files. I'd been seperating the video and wav audio and doing a recompress in either vdub or dr divx. I'll check the mod out and see what happens. Thanks

March 15th, 2006	Top \| #4
BouncingSoul Stranger Than Fiction Joined: January 2004 Location: Sioux Falls, SD Posts: 1,289 Reputation: 877 Power: 122	Re: VBR in Avi files. No luck with the mod. The audio and video are terribly out of sync when I try edit it out. I'll see if anything else works. Reps for the effort.

March 15th, 2006	Top \| #5
vertigo OSNN Senior Addict Joined: December 2005 Posts: 330 Reputation: 150 Power: 83	Re: VBR in Avi files. its pretty much guaranteed to work, make sure you select "direct stream copy" mode for the video

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March 15th, 2006	Top \| #6
BouncingSoul Stranger Than Fiction Joined: January 2004 Location: Sioux Falls, SD Posts: 1,289 Reputation: 877 Power: 122	Re: VBR in Avi files. What I did this time is set the video to direct stream copy and set the audio to full processing mode and then I set it to recompress the audio using Lame @ 192 and looks like it worked. Took about 20 minutes like you said and I didn't have to redo the video. Awesome, many thanks!

March 15th, 2006	Top \| #7
vertigo OSNN Senior Addict Joined: December 2005 Posts: 330 Reputation: 150 Power: 83	Re: VBR in Avi files. we should be able to beat that, should only take seconds, or as fast as your hard disk can go. when you open the avi file, click 'no' to the warning. set direct stream copy for video and audio (audio is set to direct stream copy by default anyway). select points you wish to cut at, save as avi it'll just do a straight cut at the nearest keyframe and dump onto hard disk

March 15th, 2006	Top \| #8
BouncingSoul Stranger Than Fiction Joined: January 2004 Location: Sioux Falls, SD Posts: 1,289 Reputation: 877 Power: 122	Re: VBR in Avi files. Originally Posted by vertigo we should be able to beat that, should only take seconds, or as fast as your hard disk can go. when you open the avi file, click 'no' to the warning. set direct stream copy for video and audio (audio is set to direct stream copy by default anyway). select points you wish to cut at, save as avi it'll just do a straight cut at the nearest keyframe and dump onto hard disk Doesn't work for me. I even tried another video splitter and it still spits out video that is around 5 seconds ahead of the audio.

March 15th, 2006	Top \| #9
vertigo OSNN Senior Addict Joined: December 2005 Posts: 330 Reputation: 150 Power: 83	Re: VBR in Avi files. hmm looks like the file in question hasn't been encoded too well...

January 18th, 2008	Top \| #10
dajm OSNN One Post Wonder Joined: January 2008 Posts: 1 Reputation: 0 Power: 0	Re: VBR in Avi files. Originally Posted by vertigo anyway vdub does not handle vbr audio (although the latest has limited vbr support). use virtualdubmod instead, you will not have to reencode anything, just click "no" when it gives you the warning, it'll turn out fine This was some excellent advice when I tried to cut a segment out of a video with vbr audio, first time around I clicked "yes" when it asked for some reason (I'm not handy with anything that comes to video editing), but then I did as suggesten and clicked "no" when it asked and the audio was in perfect sync with the video. I am using VirtualDubMod, which is in itself just excellent. Thanks!

January 21st, 2008	Top \| #11
fitz *XPista7eopardix Joined: April 2004 Location: Chicagoland Posts: 4,028 Reputation: 2947 Power: 168**	Re: VBR in Avi files. old thread.. but the message was approved because it's always nice to give thanks. Hee-hee! Evil makes my buttocks tingle.

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