Hi - system specs:
Intel Core i7-3770K @ 3.5GHz, 16GB RAM, NVidia GeForce 660Ti graphics (4GB), SSD primary HD, Windows 7 Pro 64 bit, using GPU acceleration

Project settings:
1280x720
Field order: None (progressive scan)
Pixel aspect: 1.0 (square)
Frame rate: 25fps (PAL)
Pixel format: 8-bit
Motion blur type: Gaussian
Deinterlace method: Blend fields

MP4 render format (although it's sometimes does it pre-render so don't think it's that):
Audio: 192 Kbps, 44,100 Hz, 16 Bit, Stereo, AAC
Video: 25 fps, 1280x720 Progressive, YUV, 2 Mbps
Pixel Aspect Ratio: 1.000
Reference frames: 1
Use deblocking filter
Variable bit rate (max 4Mbps, avg 2Mbps)
Slices: 4
Render using CUDA
Enable progressive download

Anything look wildly wrong there?

Cheers,

Andy

Not hijacking, but I too get an odd artifact on my renders (1920x1080 50p mp4). Funnily enough my system specs are very similar but with a 570 GPU.

Once rendered and played on my PS3 I get a single pixel width white line on one single frame approx every 15 mins. It is not on the original footage and changes its position on the video on successive renders. Very minor but its not on the original footage.

You say it is intermittent - does it always occur in the same place when it shows itself? I only ask as it could be less off putting to just chop out the offending frame when editing if it is established that is the trigger. Sure there will be a slight stutter in playback but it may look less noticable.

try with gpu off.

Have you tried the default settings for the Mainconcept AVC Internet HD 720p template? Except for Render using CPU only as Leslie recommended.

Is some of the project media interlaced? I noticed you had a de-interlace method selected even though Field Order was set to None.

Here's what I saw at 54:07 (time and frames) and here at 03.52.16.

I have my drums set up in the living room. I'll have to join in.

pilsburypie - "You say it is intermittent - does it always occur in the same place when it shows itself? I only ask as it could be less off putting to just chop out the offending frame"
It happens *around* the same place but when going frame by frame in Vegas it's not there! It's only on playback that it appears and even then it's intermittent - i.e. you press play and it's there, you press play again and it's gone.

I'll try with GPU off. john_dennis - I think the Blend fields thing was when I was playing around trying to fix the problem, need to set that back to none. Don't think I've got any interlaced footage in it - I'm just using the "HDV 720-25p (1280x720, 25.000 fps)" template, pretty much unmodified. I'll give the one you suggest a try though!

Oh, and it's only doing it on these multi-cam videos (i.e. 3 cams on screen at once). I have many other videos that just cut between cams and don't get the problem there. Very odd!

Cheers for the help!