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1st March 2005, 13:05 | #1 | Link |
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Interlaced or not?
Hello
I have ripped a PAL DVD with DVDDecrypter and now I want to index it with DGIndex (V 1.2.1). DGIndex reports the VOBs to be interlaced: Frame Type: Interlaced Frame Struct: Field Field Order: Bottom However the video does not look to be interlaced during playback in DGIndex, nor when I load the .avs (created by GKnot, without any deinterlacing filters turned on, of course) in VDub. So I guessed it’s actually progressive video just marked ‘interlaced’. BUT if I stop the playback in DGIndex (pressing ESC) the still frame IS always interlaced. Is this just a display error from DGIndex or could there be a deinterlacing filter I missed? Thanks allot, Marc. |
1st March 2005, 13:15 | #2 | Link |
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What DVD was it ? Was it a video DVD with movie content ?
Movies are progressive, however, they can be (and maybe are) encoded interlaced. Since both fields belong to the same frame, you can weave the fields and get a perfect frame, rather than with 'true' interlaced footage, where the fields are shot at different times. So, if it's a movie DVD, it's interlaced even though it doesn't have the comb effect. The Geek |
1st March 2005, 13:40 | #3 | Link |
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Oops, forgot to mention that.
Yes, it’s a movie. No apparent combing during Vdub- and DGIndex-playback, only after stopping DGIndex. Skipping through the movie with the left/right keys in DGIndex also shows no combing. Marc |
1st March 2005, 16:06 | #6 | Link |
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Thanks for the clarification!
Do I have to treat field structured video differently than frame structured one? I’m asking especially about the colour conversion from YV12 to YUY2. Another movie DVD (PAL) I ripped also looked progressive and was marked ‘interlaced’ but the frame structure was ‘Frame’. There I added the line ConvertToYUY2 (interlaced=true) to the .avs. Was that correct and should I do the same with frame struct = ‘Field’? Thanks Marc |
1st March 2005, 16:35 | #7 | Link |
brainless
Join Date: Mar 2003
Location: Germany
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do never rely on a programs output regarding interlacing.
use your eyes. so: if there are combs visible -> interlaced / combed -> treat source interlaced if no combs visible -> progressive -> treat source as progressive (ignore what the program tells you!)
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1st March 2005, 16:53 | #8 | Link |
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Pure progressive material can be, and often is, encoded as interlaced. The key is the setting of the progressive_frame flag. When it is set to interlaced, you need to upsample to YUY2 as interlaced. The latest DGDcode has a mode which allows it to automatically upsample correctly per frame by following the progressive_frame flag. You set upConv=true.
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7th March 2005, 19:08 | #11 | Link | |
brainless
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Location: Germany
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Quote:
Even interlaced subsampled YV12 with progressive Frame contents should be treaten as progressive YV12. That was one of the reasons for me to do the motion adaptive YV12 <-> YUY2 sampling.
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