Audio Ring Buffer Overflow

[Anonymous]

Okay, I just recording a tv program using ati's MMC, dvd mpeg2 preset. But everytime I to edit out the commercials, I get an Audio Ring Buffer Overflow

Here is the Video Information:

Video Stream:
File Type: Program Stream
Dimensions: 720x480
Display Size: 720x480
Frame Rate: 29.97fps
VBV_Buffer: 1792KB
Progressive: Prog or Int
Encoding: MPEG2
Stream ID: Xe0
Aspect Ratio: 4/3
Bitrate: 8.000 Mbps
Profile: Main/Main
Chroma: 4:2:0

Audio Stream:
Stream ID: xC0
Bitrate: 224 Kbps
Mpeg Layer: Layer 2
Sampling Rate: 4800 Hz

here is some of the Log File:
- 1, 151, AudioPTS:52976.00, orig PTS: 73521.37, PTS Diff: 20545.37
- 2, 152, AudioPTS:53000.00, orig PTS: 73545.37, PTS Diff: 20545.37
- 3, 153, AudioPTS:53024.00, orig PTS: 73569.37, PTS Diff: 20545.37
- 4, 154, AudioPTS:53048.00, orig PTS: 73593.37, PTS Diff: 20545.37
- 5, 155, AudioPTS:53072.00, orig PTS: 73617.37, PTS Diff: 20545.37
- 6, 156, AudioPTS:53096.00, orig PTS: 73641.37, PTS Diff: 20545.37
- 7, 157, AudioPTS:53120.00, orig PTS: 73665.37, PTS Diff: 20545.37
- 8, 158, AudioPTS:53144.00, orig PTS: 73689.37, PTS Diff: 20545.37
- 9, 159, AudioPTS:53168.00, orig PTS: 73713.37, PTS Diff: 20545.37
- 10, 160, AudioPTS:53192.00, orig PTS: 73737.37, PTS Diff: 20545.37
.
.
.
-255, 149, AudioPTS:52928.00, orig PTS: 73473.37, PTS Diff: 20545.37
**End of Audio Buffer

03/19/04 23:21:19 >> Audio Buffer: Audio Ring Buffer Overflow, start:150, end:149, count:255, End audioPTS:59048.00


any reason why i'm getting this? I had it working before but using my own preset.

[DanR]

I'll need to see the whole log file to better understand what's going on. Can you email it to me: support@VideoReDo.com

[Anonymous]

okay, just send the log file there. btw great program, other than this problem so far. Still on my trial but if I can get it to keep working good, I will reg it :)[/u]

[DanR]

btw great programThanks.

Got the log file, and sent you an email regarding the next step. It appears from the log file that there is a large section of missing video. If that's the case the present released version, build 200, doesn't handle it gracefully. The later maintenace releases that are still in beta are getting much better at it.

VideoReDo's philosophy is to do what it can to keep the audio and video in sync. I continue to be amazed at how many different kinds of problems crop up. The good news is that program is quickly maturing and is able to correct an ever wider set of file issues.

[DanR]

Thanks for sending me the segment of your movie. I was very surprised to see that your capture card converted the 30 FPS movie back to 24 FPS with 3:2 pulldown. Very impressive.

Looks like Build 207 - beta version, solved your problem. Please let me know if there are any other issues.

[Anonymous]

Hey, yes build 207 solved the problem! no sync issues either, i'm impressed.

Yeah, guess thats why I lost so many frames and created this overflow issue in the first place.

[Anonymous]

I just bought a PVR-250 with BTV, and initially had a few edits with the audio ring buffer overflow...but nothing since.

I can set my card to do inverse telecine...

Dan: Can you tell me when it would be advantagous to use the pulldown feature? I burned a DVD with it...the tv program looked fine, but some of the commercials had "mice teeth" and vibrating computer graphics...especially horizontal lines in computer graphics in the commercials. The "fonts" used in the commercials also were kind of flickery as well.

How can one tell if a program was originally recorded at 24fps?

Thanks,

Cary F.

[DanR]

Hi Cary,

First off, I don't think you can tell if the original material is recorded at 24FPS visually. Obviously if its a movie it was, but I don't know about TV shows. Many commericals are recorded on videotape at 30 FPS, so this is what you might be seeing. You would have to go down deep into the frames and fields of the file to see when it changes. Even on DVDs some portions of the DVD, usually the main title are in 3:2 pulldown, but often the extras aren't. I would have thought that the card would have figured out when its best to use 3:2 pulldown and when it isn't.

If you are recording off the air, I can't see any advantage to recording at 24 FPS with 3:2 pulldown other than a bit more compression, that was the original purpose anyway, to maximize compression on the DVD. You won't get better quality by converting a 30 FPS signal to 24 FPS and then back to 30FPS for display.