4 Replies Latest reply: Jun 11, 2010 7:21 AM by able123 RSS

    60fps - what happens when you encode to 30, or 24?

    2drumstix Community Member

      Curious if anyone knows what actually happens in the encode process when you film at 60fps and then encode to 30, 29.97 or 24 fps? How does media encoder handle the extra leftover frames during encoding?

       

      Doesnt seem to make a whole lot of sense to record at 60fps when its not supported on DVD, Bluray or flash. Wouldnt it be better quality to just record at 30 or 24 and encode "same as source"?

       

      Curious for thoughts,

      Thanks,

      Donnie

       

      ...still CS4 for now

        • 1. Re: 60fps - what happens when you encode to 30, or 24?
          Ann Bens CommunityMVP

          The only advantage i see that it will make great slomo's.

          • 2. Re: 60fps - what happens when you encode to 30, or 24?
            Community Member

            I think some sports footage is shot 60 fps...cause of the fast physical action...so there's less blur .... ??

             

             

             

            Rod

            • 3. Re: 60fps - what happens when you encode to 30, or 24?
              2drumstix Community Member

              Anyone know what is happening in the encode process when 60fps is encoded to 30, 29.97 ir 24?

              • 4. Re: 60fps - what happens when you encode to 30, or 24?
                Community Member

                Hi,

                 

                I did a google search using something like,    60fps sports video broadcast 30 fps

                 

                And got a bunch of results you might find interesting....

                 

                Here's a section of one forum conversation .....You could narrow your search to find out more as needed....

                 

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                Interesting, hadn't heard that. You're saying it was shot as interlaced 1080/60i, like a taped football match, deinterlaced to 30 fps, but then then interlaced again (using pulldown?) for 1080/60i (30i) delivery?

                Yes. At least the first five seasons were shot with regular interlaced SD video cameras (not HD). I don't know what you mean by "60i (30i)". They can't be both.


                Quote:
                My 1080/60i CRT RPTV, presumably, would treat it much like 24p material with 3:2 pulldown.

                No. It's 2:2 pulldown.


                Quote:
                But what are all the deinterlacing video processors for fixed-pixel displays doing with 30 fps material delivered at 1080/60i (30i)?

                Deinterlacing it as if it were interlaced. 30 fps progressive is so rare, I seriously doubt anything would recognize the 2:2 pattern.


                Quote:
                Understand that some ads are captured at 1080/30p, too. But again the outgoing station signals still have to be 1080/60i, so interlacing of the captured 30 fps would have to be involved, just like duplicate TV fields are involved with 24 fps delivery (2-3 pulldown) to achieve the 60-Hz broadcast rate. -- John

                Yeah, but it's a simple 2:2 pulldown like what they do for filmed material to broadcast it in PAL. It's treated no differently from interlaced material. I don't even think the frames are flagged progressive on the DVDs.

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                Rod