| Author | Message | ||
     Matt Rating: N/A |
I'm currently planning on re-working some 3-D movies that I transferred from VHD using Stereo Movie Maker and Vdub. I've been playing some of these titles back through my projector via pageflipping on Stereoscopic Player and noticed (I've seen this topic before) that all the popular 3-D titles that were once released on VHD suffer from left/right images not in sync with each other. I think it has to do with the telecine process. During playback it creates a twisted pulfrich-like effect especially in scenes where there is left and right movement. I'm guessing I'd have to omit certain frames to keep the 3-D effect constant. Does anyone have a suggested method of doing this? It seems like it would be a very tedious process but I feel would be worth it in the long run. Thanks. | ||
| M.H. Rating: N/A |
Is this a global problem (evrything is shifted) or is this a individual shot dependent problem ? I do not see any other way as cutting the movies in individual shots in e.g. Adobe Premiere 6.5, extracting L/R components and shofting the tracks for L/R eye (in A/B editing mode) ... I had already made correction of "Transitions" in this way ... What sort of output do you want to finaly create ? I hope over/under not to re-introduce again problems related to interlaced compression ... | ||
| Matt Rating: N/A |
Yes indeed, O/U format. I wish I had converted all my titles to that much sooner now that I play all titles through PC. The problem I'm having with the VHD titles is that there are alternating delays in frames for both left eye and right eye. For example, right eye images will have a one frame delay, frames line up with no delay, then left eye images will have a one frame delay and the pattern continues throughout the movie causing a really nasty pulfrich effect in scenes with movement. It would seem easy enough to reprocess if it were only one eye with the delay but the delay alternates from eye to eye. I guess I'll have to bite the bullet and spend some time on the processing. This would probably let me make some alignment and color corrections while I'm at it. | ||
| Matt Rating: N/A |
I finally figured it out. Seems during the telecine process for VHDs, a right eye frame was occasioanlly slipped in to the left eye track. I manually removed these and was able to inverse telecine as normal with no problems. Now both right and left eyes playback at the exact same rate eliminating odd 3-D artifacts and pulfrich like effects. All done in virtualdub converted to over/under format. It was nice to get rid of those subtitles too while I was at it  . I'm currently having some difficulty with smooth playback now that it reduced the fps to about 23.xxx but I selected to match fps with audio playback. Nice results but there's one instance where video slows for .5 seconds and throws the audio/video out of sync. Maybe any suggestions on that one? Thanks for all the tips. | ||
| M.H. Rating: N/A |
How did you handled the subtitles ? Are you sure the problems with DivX are not related to low CPU power ? | ||
| Matt Rating: N/A |
For the subtitles I simply used the fill filter in Vdub before using the Viewfields filter. Once the fields are stacked the letterboxing remains intact for both above and below images. I never realized immersion would be much better without subtitles and a solid 3-D window. As for the fps problem, I haven't tried to use the 3:2 pulldown in TmpgEnc yet. My first attempts were processed in video mode instead of film mode as I'm going from 24fps to 29. That may solve my playback and audio sync problems. I still have a few options but so far the work has been worth it. I projected some of the processed VHD video and the 3-D is much better once corrected. Thanks you so much for your recommendation to process above/below. It saved me the headache of reprocessing to interlaced mode. |
