HDV in timeline and audio playback is 1 frame behind, but... at DVinfo.net

Tripp Woelfel · January 21st, 2009, 06:06 PM

... it's not really. The problem is that only the playback from the timeline is a single frame off. If I try to cut on a beat or an audio hit (which I do a lot) and get it right on the timeline, the rendered output will have the video trail the audio by one frame. This happens on DVD, h.264, and BD. I can cut to the audio playback on the timeline and then slide the back one frame before output and everything will be aces.

Has anyone else experienced this? If so, gotta fix? I'd hate to have to live this new workaround along with all the other workaround Premier saddles me with.

Here's the system and project specs:
Quad core 6600 2.6GHz
4GB System memory
Vista 32 bit
CS3 - all program, driver and OS updates installed
Selective startup mode

Native HDV project: 1440x1080 PAR 1.33
60i or 24p - happens at both frame rates
Video and audio assets have the same properties as the project

TIA

Peter Manojlovic · January 21st, 2009, 06:13 PM

Just out of curiosity, is your timeline showing audio units, or drop frame timecode where the CTI marker resides?
I've always had wonky results when cutting on a timeline that displayed audio units.

Good luck!!!

Tripp Woelfel · January 21st, 2009, 07:24 PM

Quote:

Originally Posted by Peter Manojlovic

Just out of curiosity, is your timeline showing audio units, or drop frame timecode where the CTI marker resides?

Timecode. Audio units would just confuse me. (grin)

Chris Barcellos · January 21st, 2009, 09:39 PM

Tripp:

What are you outputting preview to ? And throught what ? If you are going to separate monitor, what happens if you pull preview monitor back on to same screen you have time line on ?

Tripp Woelfel · January 22nd, 2009, 07:18 AM

Quote:

Originally Posted by Chris Barcellos

What are you outputting preview to ?

The program monitor on a second computer screen.

Quote:

Originally Posted by Chris Barcellos

And throught what ?

nVidea 8800

Quote:

Originally Posted by Chris Barcellos

If you are going to separate monitor, what happens if you pull preview monitor back on to same screen you have time line on ?

Don't know. But I'll try that today and report back.

This is a non-scientific observation, but my gut tells me that the audio playback is delayed rather than the video being ahead, if that makes sense.

BTW, the audio hardware is RealTek on-board high definition. The delay is the same regardless of whether I use the analog speaker audio output or the digital SP/DIF connection.

Tripp Woelfel · January 22nd, 2009, 10:23 AM

I just tried playing the video on the same monitor as the timeline and there is no difference. It's still playing the audio about 1 frame behind the video.

Jon Shohet · January 25th, 2009, 02:33 PM

When you are manually scrubbing the CTI, if you look visually at the waveform of the audio, is there an actual synch problem between audio and video? or is it only during playback (spacebar) that the audio seems to lag behind?
Check in "Playback Settings" that "External Device" is set to "None". At least on my system, if it's set to "DV", it causes the playback to lag behind the actual events on the timeline.

Tripp Woelfel · January 26th, 2009, 09:05 PM

Quote:

Originally Posted by Jon Shohet

...is there an actual synch problem between audio and video? or is it only during playback (spacebar) that the audio seems to lag behind?

It's only during playback. Waveform peak is aligned with first frame of new video clip so the edit is on the hit. In order to get the timeline to play back in sync, I have to slide the audio one frame earlier on the timeline. That makes timeline playback correct but the final output is off.

External device is set to none. I'm editing HDV.

January 21st, 2009, 06:06 PM	#1
Tripp Woelfel Trustee Join Date: Jan 2008 Location: North Conway, NH Posts: 1,745	HDV in timeline and audio playback is 1 frame behind, but... ... it's not really. The problem is that only the playback from the timeline is a single frame off. If I try to cut on a beat or an audio hit (which I do a lot) and get it right on the timeline, the rendered output will have the video trail the audio by one frame. This happens on DVD, h.264, and BD. I can cut to the audio playback on the timeline and then slide the back one frame before output and everything will be aces. Has anyone else experienced this? If so, gotta fix? I'd hate to have to live this new workaround along with all the other workaround Premier saddles me with. Here's the system and project specs: Quad core 6600 2.6GHz 4GB System memory Vista 32 bit CS3 - all program, driver and OS updates installed Selective startup mode Native HDV project: 1440x1080 PAR 1.33 60i or 24p - happens at both frame rates Video and audio assets have the same properties as the project TIA

January 21st, 2009, 09:39 PM	#4
Chris Barcellos Inner Circle Join Date: Nov 2005 Location: Elk Grove CA Posts: 6,838	Tripp: What are you outputting preview to ? And throught what ? If you are going to separate monitor, what happens if you pull preview monitor back on to same screen you have time line on ? __________________ Chris J. Barcellos

January 21st, 2009, 06:13 PM	#2
Peter Manojlovic Major Player Join Date: Jun 2007 Location: Hamilton Ontario Posts: 769	Just out of curiosity, is your timeline showing audio units, or drop frame timecode where the CTI marker resides? I've always had wonky results when cutting on a timeline that displayed audio units. Good luck!!!

January 22nd, 2009, 10:23 AM	#6
Tripp Woelfel Trustee Join Date: Jan 2008 Location: North Conway, NH Posts: 1,745	I just tried playing the video on the same monitor as the timeline and there is no difference. It's still playing the audio about 1 frame behind the video.

January 25th, 2009, 02:33 PM	#7
Jon Shohet Major Player Join Date: Dec 2007 Location: London, UK Posts: 277	When you are manually scrubbing the CTI, if you look visually at the waveform of the audio, is there an actual synch problem between audio and video? or is it only during playback (spacebar) that the audio seems to lag behind? Check in "Playback Settings" that "External Device" is set to "None". At least on my system, if it's set to "DV", it causes the playback to lag behind the actual events on the timeline.