24p question...
- Thread starter Brooksy
- Start date
If you shoot 24p and plan on going to DVD, I would recommend you work at 29.97 - could save you some hassles later.
If you shot with a Panasonic camera, it records the image at 29.97, but with the flags in the footage for 24p. But unless you're going out to actually film, DVDs play back at 29.97 so it's easiest to work at that frame rate.
If you shot with a Panasonic camera, it records the image at 29.97, but with the flags in the footage for 24p. But unless you're going out to actually film, DVDs play back at 29.97 so it's easiest to work at that frame rate.
Bad advice. DVD players handle 24p just fine.
I wouldn't say it's bad advice...just one option. Notice I said it could cause problems later...if the poster needs to cut in other footage that wasn't shot 24p, that could be a problem. If you're going out to tape and then for broadcast on something other then DVD, you may have trouble.
There really isn't any benefit to working in a 24p timeline if you aren't going out to actual film, and even then if it wasn't shot 24pa you may have a tough time with that.
Both ways will work, but as someone who shots a lot in 24p, I always edit in a 29.97 timeline. It really doesn't make any difference in the final product. A DVD player will take that 24p video and add the pulldown to show it at 29.97.
Barry_Green
Moderator
Not true. The image is higher quality, better compression, better color space, and you can fit more footage on a disc, if you render as 24p progressive.
ONLY if you're displaying on a device that requires 29.97, and that pretty much means interlaced CRT TVs.
If you're displaying on a device that can display native progressive, then it skips the whole pulldown process. Pretty much any modern television, whether LCD or LED or Plasma or DLP or whatever, will have native progressive display, and most of them understand 24Hz.
So yes, you're losing fidelity and harming the end visual experience by going 29.97 on your timeline.
If you shot 24p, you should edit on a 24p timeline and export to a 24p MPEG-2 file for DVD playback.
j1clark@ucsd.edu
Veteran
It's the result of the stream being acquired at 24 fps, then packed into the 29.97 (30 * (1000/1001)) fps interlace telecine format.
PAL users have it much easier...
Okay - would that hold true for Standard Def? I don't mean to question you, Barry (you are the resident guru and I would defer to your knowledge), but is the color space of 24p SD (I assumed, maybe wrongly, the poster was working with SD) different then that of 29.97? And while I would agree that you can fit more on a DVD, thus giving you better compression, how would the image quality be any higher quality - isn't it still 720x480? I realize that better compression will yield better images - is that what you're talking about? Or do you mean in the sense that there isn't any interlacing going on?
Would an SD DVD player output a pure 24p signal? I have been under the impression that they always did the pulldown because how could the DVD player know what it was ouputing to?
For instance, I know when I watch DVDs on my Blu-Ray player, the player is upconverting them, and the Sony LCD montor(when I hit the display button on the remote) says it's playing them back at 1080 60P...the 24p playback light on the Blu-Ray player only lights up when I put an actually Blu-Ray disc in.
Please understand, I'm not looking to contradict you and start an arguement - just looking to gain new insight and understanding.
Barry_Green
Moderator
DVD uses MPEG-2 to encode, at 4:2:0 color sampling. But the difference between interlaced 4:2:0 and progressive 4:2:0 is night and day. Interlaced 4:2:0 is hideous, progressive 4:2:0 is pretty solid.
When you use 24p encoding, you're getting the benefit of progressive 4:2:0 color encoding, which is much superior.
Yes, better compression yields better images. And progressive images compress more efficiently than interlaced ones do. So having 20% fewer "frames" to compress per second, on top of having progressive images instead of interlaced ones, means that you'll get either better efficiency and higher quality in compression, or, if you accept a given quality level then you can have more footage on a disc.
That helps too.
A "progressive" DVD player will, yes. Through composite, no. But if it advertises that it has "progressive" component output, then yes it will.
You tell it in the menus. If your television supports 24p, you tell the DVD player that, and it'll output 24fps.
No. Color subsampling is different.
I take it, you did not care to read the article I gave you the link to. The first in the pack of four, above.
Some upscaling SD DVD players and many BD players can output native 24p.
Menu settings, HDMI handshake.
Your particular player does not output DVD-video as 24p. So what? If your TV does not have 72Hz/120Hz refresh rate, then it does not really matter, it is all converted to 60Hz with 2-3 frame repeat.