5 Replies Latest reply on Feb 27, 2011 6:30 PM by the_wine_snob

    Smart Rendering of H.264 footage in PrEl9

    Olivervideo

      Hi experts,

       

      I am wondering how smart rendering of H.264 source material (rendering of source material without reencoding video so maximum output quality and minmium processing time is achieved) works.

       

      I use footage from a Canon Powerhot S90 camera, where analysis shows that it is encoded in H.264 with 8 bit and variable bitrate with maximum 10,0Mbps is used.

       

      However, if I render unaltered clips for test purposes to harddisk with Quicktime H.264 and no limitation of the video bitrate setting is done, file size clearly grows by factor 2  compared to the original video file, which means to me that it is reencoded with a higher bitrate.

       

      Of course I can manually set the bitrate according to the source, but what is 10,0 Mbps in the bitrate dialogue setting in PrEl9 - 10000 kbps? 10240 kps? I also doubt that if I am starting to deal with the video codec's detailed parameters, and there are many, that I will meet the exact parameter combination of the source footage that will actually allow samrt rendering. Or am I wrong?

       

      So my questions is how I can achieve smart rendering of H.264 material. Is there any function that the codec uses all original parameters of the source footage?

       

      Thanks for advice,

       

      Olivervideo

        • 1. Re: Smart Rendering of H.264 footage in PrEl9
          the_wine_snob Level 9

          Unless I am missing something important, the term Smart Rendering refers to the process of Exporting MPEG material, that has not changed, without Transcoding. Some NLE (Non Linear Editor) programs allow for this. Important Note: notice the term, "that has not changed," as if you add any Effect, or overlay (PiP, Title, etc.) then Transcoding will be needed. The same holds trure for areas of the Clips, with added Transitions.

           

          PrE does not support this type of Smart Rendering.

           

          It does support Rendering, that basically creates proxy files for smoothest playback. This ARTICLE will give you background on that.

           

          If you are talking about something else, please correct me.

           

          Good luck,

           

          Hunt

          • 2. Re: Smart Rendering of H.264 footage in PrEl9
            Olivervideo Level 1

            Hunt,

             

            I agree with your definition of smart rendering, but understood that PrE does support smart rendering for MPEG and, since version 9, also for H.264. I learned this from this article abaout what's new in PrE 9:

             

            http://forums.adobe.com/thread/725424?tstart=0

             

            [quote]

            Improved support for AVCHD video. AVCHD video can now be edited natively in Premiere Elements! That means you don’t have to render the video (if you’re using the correct project preset) on the timeline until you add effects or transitions to it.

            [end quote]

             

            Oliver

            • 3. Re: Smart Rendering of H.264 footage in PrEl9
              nealeh Level 5

              I think you have misinterpreted the sentence you quote. Prior to PRE9 any AVCHD clip you imported would require a complete timeline render before PRE would give any kind of acceptable preview during the editing stage of your workflow. In practical terms you would see when you imported the clip a red line across the whole length of the clip. In PRE9, providing you select the correct preset the need for that render was no longer necessary. In practical terms there would be no red line across the whole length of the clip. In all versions of PRE when you share the project to any format then PRE will re-encode the footage.

               

              Cheers,
              --
              Neale
              Insanity is hereditary, you get it from your children

              • 4. Re: Smart Rendering of H.264 footage in PrEl9
                the_wine_snob Level 9

                Well, the term "Render" is thrown about, and as it applies to all Adobe programs, it means to create proxy files for smoothest playback. The Smart Rendering means to Export with not additional Transcoding for unchanged parts. This ARTICLE will give you background.

                 

                Others use Render to equal Export, but not Adobe.

                 

                Hope that this helps,

                 

                Hunt

                • 5. Re: Smart Rendering of H.264 footage in PrEl9
                  the_wine_snob Level 9

                  As Neale points out, PrE handles AVCHD natively for editing. Many other programs have to create proxy files for editing, and not just for smoothest playback.

                   

                  Good luck,

                   

                  Hunt