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PuccioTosch
Participating Frequently
April 23, 2020
Question

Video lagging and bad quality after rendering

  • April 23, 2020
  • 2 replies
  • 9706 views

Hi there! I'm facing a terrible problem. I'm using Premiere Pro 2018. After rendering my video and producing it, I noticed it's not fluent at all and the quality is bad. I've never faced this problem. My original source video is 848x480 and I want to export it to 1920x1086. My video contains clip having different frame rates: some of them run on 43fps, instead most of them on 29.97 fps. I think the problem is in the slow-motion clips (43fps). I'm trying to change some options while exporting small parts of my video, but it still takes a lot of time (I can't spend 5 minutes for every attempt!). I've tried to find the solution online, but nothing seems working. I'm trying to export the video in 29.97fps, 50fps, 60fps but nothing changes. Moreover, the quality is low in all the cases, despite I export it in H.264. Moreover, I have some clips slowed using optical flow, so when I export the video, should I use optical flow or frame sampling (most of the clips use this last one)? It's driving me mad!

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2 replies

Ann Bens
Community Expert
Ann BensCommunity Expert
Community Expert
April 24, 2020

All your footage looks like it has variable framerate.

Hence being a mess after export.

Make sure all footage has constant framerate (Handbrake).

Upscaling SD to HD nearly always results in image quality loss

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Steve Griffiths
Inspiring
April 24, 2020

Have your render settings for your H.264 encode changed? For example in the export dialogue menu try setting the 'preset' menu to 'Match Source - High Bitrate' (see attached image).

Additionally you are scaling your 848x480 footage to HD resolution - so you will see a significant 'softening' of your image in the HD output.

 

If you've already applied optical flow to clips in your sequence - no need to apply again in your export settings. Leave 'Time Interpolation' in your export setting at 'Frame sampling'

Also you mention 'not fluent', does this mean your motion is not appearing to be smooth in your exported videos? If so you should apply 'optical flow' to (most) clips in your sequence that do not match your sequence frame rate.

For example if your sequence is set to 29.97fps you should apply optical flow to your clips that do not match 29.97fps (like your 43fps clips).

However (another issue), and this might be what you are seeing - optical flow can create weird motion effects. They often appear as foregound movement appearing to drag' some of the background as the object moves. If this is a problem select 'frame blending' for these clips in your sequence.

Another option for clips that do not match your sequence frame rate is to right click these clips in your bin, select > modify > interpret footage and change the frame rate for the clips to match your sequence frame rate. Look for the 'assume this frame rate' section of the interpret footage panel. This won't work if your clips have sync sound, like people talking and in the case of changing 43fps footage to 29.97 will slow you footage down. 

Sorry, covered a lot. Hope this helps a little bit.

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    PuccioToschAuthor
    Participating Frequently
    April 24, 2020

    Moreover, if I use Match Source - High bitrate I don't get the HD option on Youtube because the video rendered is 848x480

    S
    Steve Griffiths
    Inspiring
    April 24, 2020

    848x480 is a standard definition resolution. It's not HD. So putting this footage into an HD sequence (1920x1080) or exporting it to HD (1920x1080) is not going to make it HD.

     

    There may be 'some' benefits to upscaling your 848x480 footage into an HD sequence if you are (say) adding graphics/text etc. but without knowing more about what you are creating it's hard to make the best suggestion.

     

    But the bottom line is - yes you could put your 848x480 footage into a 1920x1080 sequence and scale it up to fit the HD frame - then export to a 1920x1080 video - so you can get the 'HD' option on YouTube but the video will still only have the resolution of a standard definition video. 

    Does that make sense?

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