introspect
1st July 2009, 22:57
I'm in the process of encoding an SD music video, but this question just popped into my mind.
Suppose that your source is dominated by movement, like a hockey or race car segment, or a music video. Suppose also that it's in 1080i at 29.97 fps.
After de-interlacing, the video is now 1080p at 59.94 fps. From that point on, I can see a couple options:
1) All filtering done at 59.94 fps, final encode at 59.94 fps
2) All filtering done at 59.94 fps, final encode at 29.97 fps
3) All filtering done at 29.97 fps, final encode at 29.97 fps
With SD I would always opt for the third choice, because I don't feel that the motion is under a microscope. But maybe it's different with HD content.
Which option would you pick? Myself, I would hazard to guess that option 2 might allow motion-based filters to perform better. But do you gain anything with a high-motion source by staying at the higher frame rate throughout?
Also, suppose you plan to downscale to 720p. Would that change your decision? And would it make any material difference if you downscaled right after de-interlacing, or downscaled right before encoding?
Suppose that your source is dominated by movement, like a hockey or race car segment, or a music video. Suppose also that it's in 1080i at 29.97 fps.
After de-interlacing, the video is now 1080p at 59.94 fps. From that point on, I can see a couple options:
1) All filtering done at 59.94 fps, final encode at 59.94 fps
2) All filtering done at 59.94 fps, final encode at 29.97 fps
3) All filtering done at 29.97 fps, final encode at 29.97 fps
With SD I would always opt for the third choice, because I don't feel that the motion is under a microscope. But maybe it's different with HD content.
Which option would you pick? Myself, I would hazard to guess that option 2 might allow motion-based filters to perform better. But do you gain anything with a high-motion source by staying at the higher frame rate throughout?
Also, suppose you plan to downscale to 720p. Would that change your decision? And would it make any material difference if you downscaled right after de-interlacing, or downscaled right before encoding?