8 Replies Latest reply: May 21, 2012 5:33 PM by Bernie at Clarity RSS

    Re-rendering Canon XF footage

    Bernie at Clarity Community Member

      Hi - just upgraded to CS5.5 for a new project. I bought it in the "free upgrade to CS6" period, so I'll grab that when it's available. Auto updates are on, so the software is at 5.5.2


      I've got a puzzling issue with footage from a Canon XF300. The project is a multi-camera shoot of a school musical production, with footage from 2 x Sony Z1P cameras (stage left and stage right), and the Canon (locked-off wide shot from the lighting/audio control box). The project's specs are set for the Canon's footage (1920x1080 square pixels) and the Sony footage is imported to conform (1440x1080 1.333 pixel aspect ratio). About 90GB of footage files, all up.


      Import, indexing, peak and cfa generation all went fine, but the indicator bar above the Canon footage timeline goes red if I so much as blink! I'm using opacity changes and a colour correction on the Canon footage, and of course that needs a render for smooth preview - but the bar still goes red if all I do is move the clip along the timeline. It's already rendered for the opacity and colour correction, now I just want to fine-tune the position of the clip, but moving it even a single frame left or right makes it want to re-render again, and that's slowing me down quite a bit. If I don't render the clip, then playback is too jerky to work with. I can turn playback resolution down to half to get around this, but I still think it's weird to have to re-render for a simple move. Any ideas? The Sony footage does not suffer this problem - one render if I use or change an effect (e.g. opacity or scaling), then I can move that clip without having to re-render.


      I've already spent my budget on equipment (8GB memory and separate hard drives for OS/programs, media storage, and renders), so further hardware upgrades will have to wait.


      The machine has a Corei5 CPU with 8GB DDR3 memory, one PATA drive for OS/programs/swapfile, a 500GB SATA for media, and a 500GB SATA for renders. Windows 7 Pro. Once the footage is rendered, playback is very smooth, so video performance is satisfactory.

        • 1. Re: Re-rendering Canon XF footage
          Jim_Simon Community Member

          You should not have any trouble playing back unrendered footage with that CPU.  Something is wrong somewhere.


          Have you tried running the following?



          • 2. Re: Re-rendering Canon XF footage
            Jim Curtis Community Member

            I'm on Mac, and Pr 6 continues to un-render entire sequences, even after making a change to one clip.  I wish it wasn't so, but I suspect it's because Pr does top-down rendering, like Avid's Smart Render, as opposed to their option of bottom-up, with the Render All option, which allows one to make changes to upper layers without losing the rendering done on lower layers.


            I wish Pr had both too.  I've put in a feature-request, and perhaps you'll consider adding your voice to the chorus.


            I would like to compliment you on the lucidity of your post.  You described your issue articulately, and provided pertinent info about your set-up.  This puts you in a minority here.  I wish it was standard, but it's not.

            • 3. Re: Re-rendering Canon XF footage
              Bernie at Clarity Community Member

              Will do, thanks. I'll see what it has to tell me.

              • 4. Re: Re-rendering Canon XF footage
                Bernie at Clarity Community Member

                How can add my voice to the feature request? Is there an Adobe equivalent to the "Like" button somewhere?


                Thanks - if there's one thing I've learned about tech support, clear communication is important.

                • 6. Re: Re-rendering Canon XF footage
                  Jim Curtis Community Member

                  I put a bookmark button on my browser's title bar.  I do a lot of feature requesting and bug reporting.  Nice to have it handy.

                  • 7. Re: Re-rendering Canon XF footage
                    Bernie at Clarity Community Member

                    OK - I'll follow up that feature request later today - depending on the results of changes I make to the system from the research I've done this morning (I'm in Queensland, Australia) - I think I've found the problem - my video card isn't on the list of "certified for hardware MPE playback" adapters. I re-checked all the preferences and project settings dialogs and found that "Video rendering and playback" option was greyed out and set to "software MPE only".


                    It's an nVidia GeForce GT240 - CUDA-enabled with 96 CUDA cores, and 1GB DDR3 memory. There is a website with instructions on tricking PPro into accepting this adapter. My card appears to have the bare minimum to enable hardware MPE, so I'm going to give it a try.


                    Yes, I understand that I'm straying from the path and may encounter problems ranging from minor annoyances to potential project corruption, so I'll make backups of everything before I start. I'm not going to overclock anything, and I'll only make one change at a time. If this course of action violates any of the forum's rules, than I apologise in advance, and my next purchase will be a certified video adapter.

                    • 8. Re: Re-rendering Canon XF footage
                      Bernie at Clarity Community Member

                      Seems to have done the trick! PPro accepted the card, gave me the option to use hardware MPE playback, and stopped turning the render bar red whenever I made an adjustment to a Canon clip.


                      I'll tell it to produce some output and see what happens. If that works, I'll give the PPBM5 benchmark a run.