Hi,
Does anyone know how to fix a suspected field order / frame problem? I have a lower field first DVD PAL mpeg2 file that moves two frames forward, one frame back when burnt to DVD and viewed on TV.
I've tried various field order combinations in the "project", "clip" and "burn" properties (including the procedures layed out in the "Stickies") without achieving a satisfactory result. I've also done the usual tests e.g. viewed on other DVD players, checked formats on other disc etc.
The annoying part is that I've actually succeded in creating a succesful test file, but haven't been able to duplicate it!
I'm not entirely sure that it's a "properties" problem - maybe it's caused by an extraneous field in the original file or some other sync issue.
Can anyone help?
Thanks,
Steve.
Solution for field order / frame problem?
Moderator: Ken Berry
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VidKid
Hi guys,
Thanks for your patience and your quick response. It's great to have this kind of help available.
When I view the video frame by frame on the TV, the whole clip appears to go 2 frames forward then 1 frame back. In other words, it appears to jump backwards and forwards as it progresses.
The clip looks fine in UVS 9 "clip" view, so does the project when rendered at high quality. The playback in the "Create Disc" process is also smooth (as expected).
Regarding the TV card, the clip was downloaded from a Panasonic NV DS-15A camcorder. As far as I recall the "capture" properties were set to lower field. If DV is lower field and the tuner is upper field, would that make the clip upper field or lower field? The original clip properties show as "lower field first", as do the clip properties on the DVD.
Is it possible that field order was accidentally reversed during the download, resulting in the clip properties showing the wrong field order? If so, what should the project, clip and burn properties be to make it flip-flop back to the correct order?
Thanks,
Steve.
Thanks for your patience and your quick response. It's great to have this kind of help available.
When I view the video frame by frame on the TV, the whole clip appears to go 2 frames forward then 1 frame back. In other words, it appears to jump backwards and forwards as it progresses.
The clip looks fine in UVS 9 "clip" view, so does the project when rendered at high quality. The playback in the "Create Disc" process is also smooth (as expected).
Regarding the TV card, the clip was downloaded from a Panasonic NV DS-15A camcorder. As far as I recall the "capture" properties were set to lower field. If DV is lower field and the tuner is upper field, would that make the clip upper field or lower field? The original clip properties show as "lower field first", as do the clip properties on the DVD.
Is it possible that field order was accidentally reversed during the download, resulting in the clip properties showing the wrong field order? If so, what should the project, clip and burn properties be to make it flip-flop back to the correct order?
Thanks,
Steve.
The effect you describe is exactly what happens when the fields are reversed, i.e. field N is followed by field N-1, going back in time/motion, then followed by N+2, then N+1 etc
You could capture again if you wish but the easiest is to render again with the opposite field order.
It is less important to have a specific field order than to respect the field order from capture to authoring.
Your DVD player will usually swap fields if they are not in the logical order, but the player will use whatever the VOB header reports, right or wrong.
You could capture again if you wish but the easiest is to render again with the opposite field order.
It is less important to have a specific field order than to respect the field order from capture to authoring.
Your DVD player will usually swap fields if they are not in the logical order, but the player will use whatever the VOB header reports, right or wrong.
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VidKid
It doesn't matter in fact IF you didn't add to the movie. Whatever step you make the change will work.
BUT if you added something to the pictures (like titles, effects, overlays) as opposed to plain cut/move then the rendering is backwards and you have to change the project settings, disable smart rendering, create video file again and author using the new field order. If you doubt, this is the way to go.
Do everything (capture/render/author) with the same field order.
BUT if you added something to the pictures (like titles, effects, overlays) as opposed to plain cut/move then the rendering is backwards and you have to change the project settings, disable smart rendering, create video file again and author using the new field order. If you doubt, this is the way to go.
Do everything (capture/render/author) with the same field order.
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VidKid
Thanks Daniel!
I experimented with a newly captured clip. I didn't realise that a lower field DV camera file could be accidentally downloaded as an upper field mpeg but still show as lower field in the clip properties! I'll put that one down to experience.
I managed to correct the problem by:
- opening a new project
- adding the offending clip (lower field first)
- ensuring that the project was set to lower field first
- creating & saving a new video clip (lower field first)
then:
- opening a new project
- changing the project settings to UPPER FIELD
- changing to "Create Disc"
- adding the new video clip to the empty timeline
- checking that the "media clip" properties were lower field first
- checking that "project settings" showed lower field first
- leaving the "Mpeg Settings" untouched
- switching off "Do not convert compliant mpeg files"
- burning the disc.
So it seems that the problem of incorrect field order in mpeg 2 files can be corrected without having to recapture the original file. The clip still jumped in one or two spots, but the combing and stuttering were gone.
Again, thanks for your help.
Cheers,
Steve.
I experimented with a newly captured clip. I didn't realise that a lower field DV camera file could be accidentally downloaded as an upper field mpeg but still show as lower field in the clip properties! I'll put that one down to experience.
I managed to correct the problem by:
- opening a new project
- adding the offending clip (lower field first)
- ensuring that the project was set to lower field first
- creating & saving a new video clip (lower field first)
then:
- opening a new project
- changing the project settings to UPPER FIELD
- changing to "Create Disc"
- adding the new video clip to the empty timeline
- checking that the "media clip" properties were lower field first
- checking that "project settings" showed lower field first
- leaving the "Mpeg Settings" untouched
- switching off "Do not convert compliant mpeg files"
- burning the disc.
So it seems that the problem of incorrect field order in mpeg 2 files can be corrected without having to recapture the original file. The clip still jumped in one or two spots, but the combing and stuttering were gone.
Again, thanks for your help.
Cheers,
Steve.