Green frames added to short clips when rendered

Slim_Pickins wrote on 4/16/2015, 10:00 AM

I' getting green frames added when rendering short clips (pro 12 & 13 latest vers) This only happens if the clip is 10 frames or less, for example if the clip is 7 frames it will add 4 frames of green, anybody come across this, appreciate not many people render 6-7 frame clips individually but I've just done 1000 (paid work thank goodness). It happens in all render codecs, Surely there is not a minimum render length in Vegas but it looks like it, tried all the usual fixes like CPU render only, no overlap on looped region etc but no fix forthcoming.

Its one long clip, MP4 file, 50fps, frame size 400X400. GPU render is off. I'll try rendering source material to a different format and see if that works

Comments

john_dennis wrote on 4/16/2015, 11:47 AM

I just tried to unsuccessfully to reproduce with 1080-23.97p source and Sony AVC for Blu-ray render template.

What is your source?

Does it have a long group of pictures?

Have you tried rendering your source to a codec that uses intra-frame encoding then doing the cut?

Grasping at straws here.

Arthur.S wrote on 4/16/2015, 11:58 AM

GPU or CPU render? If GPU, try turning off.

PeterDuke wrote on 4/16/2015, 10:59 PM

I just renderd (using Vegas 13 build 428) 7 frames from the middle of a PAL AVCHD file to the Sony AVCHD template and got 7 frames of video followed by 4 frames of dark grey (not quite black).

Looks like a bug.

john_dennis wrote on 4/16/2015, 11:56 PM

I regret to report that I was able to get the same result using Vegas 13 build 444 with NTSC AVCHD from a Sony consumer camera.

Using the Sony AVC/MVC Blu-ray render template from a 1080-23-97p AVC source yielded one black frame.

A PNG Still Image Sequence rendered properly from both sources. I think I'd use a PNG still image sequence for such small clips as a workaround.

PeterDuke wrote on 4/17/2015, 12:14 AM

I just tried VideoReDo, but it only output 1 frame instead of the 7 it said it would. The file size looks like it should be more than 1, however.

It may be something to do with GOPs. (GOPs in my AVCHD are about 13 frames.) You might need to render to a codec with no interframe compression.

PeterDuke wrote on 4/17/2015, 12:39 AM

I was able to render 7 frames to Lagarith, but the minimum with DNxHD was 9. With 8 or lower I got an error.

Slim_Pickins wrote on 4/17/2015, 4:59 AM

Thanks Peter,
I'll try rendering source to a different format