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A
Abdul_Majid
Known Participant
August 22, 2012
Question

Premier Pro Slow Motion is jerky (not smooth) when exporting with Mercury Playback GPU Acceleration

  • August 22, 2012
  • 4 replies
  • 43878 views

When rendering slow motion video clips (video slowed down to, for example, 30%), with Mercury Playback GPU Acceleration and with frame blend enabled, the rendered video is not smooth (is jerky). Frame Blending does not have any effect on the rendered output , The results are identicle with and without Frame Blend.

When software only rendering, and with frame blend enabled (ticked), the resulting video is smooth motion.

Please take a look at the following which demonstrates the issue:

https://vimeo.com/48133743

I am using the following:

Windos 7  64 bit

Premier Pro CS5.5 (with latest updates)

NVIDIA GeForce GTX 570 (with latest driver)

The video I am rendering is HDV 1080i format..

I have tried exporting in MPEG2 and M2T with Max Render Quality ticked. Both formats produce the same results.

Why does Frame Blending have no effect on slowed down clips when exporting with Mercury Playback GPU Acceleration? Is this a known issue?

    This topic has been closed for replies.

    4 replies

    D
    D225342979z9o
    Inspiring
    May 31, 2022

    Hi I am having the same issue as you. It started last week all of a sudden. Using Sony A7S3 10 bit, 60 frames a second slowed to half, I am having bad motion blur even with very slow movements on my part while taking video. I don't know what to do about it. I am trying to search for a solution. I dropped back to version 22 2.0 and I thought that fixed it, but no.

      J
      Jaron Wong
      Participant
      June 22, 2022

      God. I'm running into this for months! It's unbelievable that they haven't fixed this since 2014.

      Looking for solutions but nothing can help.

      S
      seelenfaenger
      Participant
      November 2, 2012

      Thought I chime in here for some more information. I'm not a video pro (rarely do anything related) but from what I understand slowing down a clip and enabling Frame Blend should produce a smooth result. However, when I do exactly that with the current CS6 I get the same choppy result that has been the subject of this thread.

      So as long as I am not overseeing something in the process of creating slow motion, the problem still exists with CS6.

      To test it I used a h264 video @ 1080p60 I exported with Sony Vegas at 100% speed and normal settings (as far as I can tell) earlier. I imported it into a new project, slowed it down and enabled frame blend (for the clip as well as later in export). However, the frames in the resulting video are not interpolated but duplicated, so all I see is a slide show with 12 FPS.

      Renderer is MPE, software only (apparently my 660 Ti is not even supported...).

      D
      Dave_Knarr
      Participating Frequently
      November 3, 2012

      First, I have a video showing the slow motion problem in CS5.5 and CS6.  CS5 seems to be okay.  Here it the link to the video    http://www.studio1productions.com/blog/?p=93

      Also, you can enable you 660Ti to run in GPU mode.  Here is an article explain how and a software program I wrote that will do it for you for CS5, CS5.5 and CS6

      http://www.studio1productions.com/Articles/PremiereCS5.htm

      Dave

      A
      Abdul_MajidAuthor
      Known Participant
      December 28, 2012

      Hi

      I raised this issue with Adobe back in August 2012 - see above. Adobe have withdrwan the support case I raised with the following comments:

      "The case has been withdrawn as it is a known bug & has been reported to our Engineering Team for further research."

      So, at least it has been acknowledged as a bug. Hopefully a fix on its way in the not too distant future.

      Jeff Bellune
      Jeff Bellune
      Legend
      August 25, 2012

      I don't know what combination of hardware or settings is affecting your result, but I just exported AVCHD 1080i source footage that was slowed down to 15% using hardware MPE in CS5.5 and the result was silky-smooth slow motion.  I exported to MPEG2 Blu-ray using Premiere Pro's built-in encoder.  I have a GTX560Ti card using the latest drivers.

      Jeff

      E
      excited_Genie16B8
      Legend
      August 25, 2012

      In my test with 24p media, both hardware and software looked like crap at 30%, very stuttery, even with Frame Blend.

      A
      Abdul_MajidAuthor
      Known Participant
      August 30, 2012

      What sequence Presets do you use with the video material with these tests? Have you tried the test with transcoding the HDV to MP4?

      Eric

      ADK


      Hi Eric, the source clip is PAL 1080i HDV (1440x1080), upper field order. I'm transcoding to the same format i.e. FORMAT=MPEG2, PRESET=1440x1080i 25 High Quality.

      I've also tried transcoding to MP4 but no notable difference to motion jitter.

      I don't beleive it is a problem with the presets. It is to do with Frame Blending not being recogized or applied at the time of transcoding. If I compare a clip produced in software only CPU mode (without frame blending) to a clip produced with GPU Acceleration with Frame Blending, both outputs look the same i.e. with motion jitter. It is frame blending that makes the slow motion smoother - frame blending is not working is CS5.5 with GPU Acceleration.

      When testing, it is best to slow the clip to approximately 15%. Also, use a clip where the camera is panning from right to left or left to right so there is more chance of seeing motion jitter. Some people have reported no problems. As Dave pointed out above, it really depends on the clip you are using for your test. If it is not slowed down enough or it does not contain much in the way of panning, it is difficult to see the jitter.

      You don't need to export the clip to see the motion Jitter. It is also visible in the preview window. 1. Enable GPU Acceleration, 2. Delete Any Exiting Previews, 3. Render Entire Work Area to generate new previews 4. you will see the motion jitter in the preview window - nothing to with with transcoding presets.

      Obviously by slowing something down to 15% there is bouind to be some motion jitter. But you will notice there is a huge amount of difference when you compare the amount of jitter between Software-only CPU and GPU Accelerated video clips.

      A
      Abdul_MajidAuthor
      Known Participant
      August 25, 2012

      This is the first time I have used this forum. I am surprised no one has replied after several days of me posting this question. Perhaps I have not described the problem clearly. If anyone has any questions or requires clarification, please do not hesitate to ask.

      I have since been liaising with Studio 1 Productions who have also confirmed this problem in CS5.5 - please visit the following link for more information:

      http://www.facebook.com/permalink.php?story_fbid=455951077751730&id=149452058431969

      We are conducting further experiments to see if this problem also exists in CS6.

      Can anyone suggest how we can get this escalated to the right people?

      Jeff Bellune
      Jeff Bellune
      Legend
      August 25, 2012

      Can anyone suggest how we can get this escalated to the right people?

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