AV Sync problem-Pro advice desperately needed

[John Rofrano]

What format are the files that you are editing? What format and bit-rate are you rendering to? Without this info it’s tough to say what might be going on.

Try making a RAM preview (i.e., make a timeline selection and press Shift+B) and see if it still stutters. It should not. If it does stutter then you need to determine what is it about that part of the project that might cause the problem. It could even be a corrupt source file.

~jr

http://www.johnrofrano.com
http://www.vasst.com

[Richard Diandrea ii]

Hi JR. Thx for responding.

Of course…that info would be helpful to you!

The original files are AVCHD shot on a SONY HDR SR1. Frame rate is 29.79. The projct property settings;

Pixel Format: 32-bit floating point(Full Range)
Full resolution rendering quality: Best
Adjust source media to better match project or render settings: This is checked

AUDIO
Sample Rate: 44KHz
Bit Depth: 16
Resample & strecth quality: Best
Stereo

Rendered Using SONY AVC
Template: AVCHD 1440×1080-60i

I can’t think of anything else at the moment.

Thanks.

Richard

[John Rofrano]

Try turning off 32 bit floating point. Audio for video should be 48K (not 44K). Did you try Shift+B? What did you see?

~jr

http://www.johnrofrano.com
http://www.vasst.com

[Richard Diandrea ii]

I’m not sure I’m doing this correctly…I opened the VEG file and highlighted a section of the video. Then I simply pressed “Shift” & “B” at the same time…then pressed play. Is this correct? It did dtill stutter and go off sync.

[John Rofrano]

Yea, that’s correct. Did turning off 32-bit pixel format help?

~jr

http://www.johnrofrano.com
http://www.vasst.com

[Richard Diandrea ii]

It seemed to flow well fo about 7 minutes. then all of a sudden it began doing it again. It is strange how the video looks when it begins doing it. All of a sudden the video will start slightly hesitating. I don’t know how else to explain it. It’s as if it just can’t keep up any longer…..

[John Rofrano]

Yea, it’s really strange which is why I asked about doing a RAM preview because that would eliminate your CPU from the equation. AVCHD is really hard on a CPU but this is really strange behavior if it runs for 7 minutes without problems and they stutters. Is it only with this project or do other projects have this problem too?

~jr

http://www.johnrofrano.com
http://www.vasst.com

[Richard Diandrea ii]

Others, too. But not all. It happens when I play the renedered file and the veg file. But almost never in the exact same spot….near the same place just not exactly. It also does it when playing via my “Popcorn Hour” digital Media player thru my projector. Really driving me crazy!!

You know, this also happened with an old file I was editing that was originally shot on my old Hi-8mm camcorder. I have to start looking at everytthing to see if all my stuff is buged.

[Richard Diandrea ii]

John…hope you’re still out there listening! Or, of course, anyone else that may help me figure this out.

What I’ve done since my last post was to experiment a little. Again, I am not very literate with hardware or software so the likely hood of me doing something wrong is high. Anyway….I have repeatedly played the veg file and the rendered digital file of the same video with the following settings;

Pixel Format: 8-bit
Full resolution rendering quality: Best
Adjust source media to better match project or render settings: This is checked

AUDIO
Sample Rate: 48KHz
Bit Depth: 16
Resample & strecth quality: Best
Stereo

Rendered Using SONY AVC
Template: AVCHD 1440×1080-60i

Everytime I play either file back thru Vegas 9 (veg file) or indows media (AVC rendered file) it will eventually go out of sync. NEVER in the exact same spot. Some tmes it is in the same area…some times it is not. It isn’t like there is an obvious GLITCH or scratch that creates a [problem at the exact spot each time. It always varies. This tells me the chances of it being related to my hardware is significant.

The machine I’m using is a Vaio VGN AW190, Duo Core 2.8 GHz, 8 GB RAM, 64bit OS.

The other machine I’m uing to play my digital files is a Popcorn Hour C-200. I get the same type of results using both machines.

To try & identify if it’s a hardware issue, I used Vegas to render and burn to Bluray disc.
Playing the disc back on my Vaio Notebook…it played perfectly. NO SYNC issues!!! Do you believe it’s a hardware issue?? How can I be sure?? More importantly….How the hell can i play these great files in the best quality withour down sizing its resolution??!!!

Thank you.

Richard

[John Rofrano]

The fact that the Blu-ray version plays correctly says that it’s not Vegas or the render… it’s the playback device. Try using a different media player on the PC. What is really odd is that the Popcorn Hour has the same problem. Maybe it’s the bit-rate is too high? The default bit-rate for Sony AVC | AVCHD 1440×1080-60i is 15,000,000. Try knocking it down to 9,000,000 and see if that helps any.

I have a WD TV HD Media Player and I use 9MBps AVCHD files with that and they play back fine. Worth a try.

~jr

http://www.johnrofrano.com
http://www.vasst.com