vmesquita
13th May 2003, 19:11
Hi everybody,
When I was buying a VCR this year, a choose the only model that could play PAL-B/G/N tapes (a panasonic model). But when I finally got a PAL-N tape to test, I found out that it plays the tape at 50 hz, but converts the color information to PAL-M (and later I checked the manual, and it says clearly that PAL tapes will only work with TVs that support PAL-M at 50 hz). (PAL-M is NTSC with different color codification)
I am using BTWinCap drivers and tried every broadcast mode with no success... The closest think I got is choosing PAL-NC, this way I could get a color image (but the colors were misplaced, green becomes blue and vice-versa and so on...). I mailed Eduardo (the BTWinCap author) asking if there's a solution. But I was thinking that maybe some avisynth filter could correct the chroma information.
Then I did an experiment: got a PAL tape, played on the VCR. It had that inicial color bars on the beggining. I set to PAL-NC and captured. Then I set to PAL-M (colors right, but image desync), and captured. And I run throught the following script:
a=AVISource("PAL-NC.avi").bilinearresize(320,240)
b=AVISource("PAL-M.AVI").bilinearresize(320,240)
ret=mergechroma(a,b,1)
return(ret)
There might be spelling error since I don't have the script here, but it was more or less like this. Well I got a image with desynched chroma, but right colors on top! Now I ask you:
Is it possible to calculate the color differences (maybe in RGB or other colorspace) and apply a script that would correct the colors in the movie? Any ideas? Any help would be very appeciated.
[]'s
Vmesquita
When I was buying a VCR this year, a choose the only model that could play PAL-B/G/N tapes (a panasonic model). But when I finally got a PAL-N tape to test, I found out that it plays the tape at 50 hz, but converts the color information to PAL-M (and later I checked the manual, and it says clearly that PAL tapes will only work with TVs that support PAL-M at 50 hz). (PAL-M is NTSC with different color codification)
I am using BTWinCap drivers and tried every broadcast mode with no success... The closest think I got is choosing PAL-NC, this way I could get a color image (but the colors were misplaced, green becomes blue and vice-versa and so on...). I mailed Eduardo (the BTWinCap author) asking if there's a solution. But I was thinking that maybe some avisynth filter could correct the chroma information.
Then I did an experiment: got a PAL tape, played on the VCR. It had that inicial color bars on the beggining. I set to PAL-NC and captured. Then I set to PAL-M (colors right, but image desync), and captured. And I run throught the following script:
a=AVISource("PAL-NC.avi").bilinearresize(320,240)
b=AVISource("PAL-M.AVI").bilinearresize(320,240)
ret=mergechroma(a,b,1)
return(ret)
There might be spelling error since I don't have the script here, but it was more or less like this. Well I got a image with desynched chroma, but right colors on top! Now I ask you:
Is it possible to calculate the color differences (maybe in RGB or other colorspace) and apply a script that would correct the colors in the movie? Any ideas? Any help would be very appeciated.
[]'s
Vmesquita