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natashab82106007
Participant
February 13, 2024
Question

Export h264 glitch

  • February 13, 2024
  • 1 reply
  • 518 views

I am working on a video series, I have 3 sequences each 8 - 10 minutes.  Source videos are 1080 / 24fps mov files.   I'm editing multi-cam video tracks, 7 audio tracks, using dynamic link with some After Effects texts.  Final output needs to be mp4 to post online.  Two of the sequences are rendering fine with the media export .h264 setting, but one of them is giving me trouble.  It's 8 minutes long, and about halfway through it is pixelating.  From about 3.5 -5 minutes on the exported file, the video image gets blurry and pixelated.  Not the opening 3 minutes, not the final 3 minutes, just the middle. The playback from timeline in premiere does not do this pixelation, it looks good there, the problem only comes up with exporting the whole sequence.  I had some lumetri color correction (which was applied in other clips throughout the timeline too, and in the other projects, and it rendered correctly), I removed all effects to see if that was an issue.  I exported directly from premiere, and tried with media encoder.  Same issue each time.  When I render it as quicktime mov file there's no problem, it looks great - but it's an enormous file.    I tried converting the mov file (which looks good) in media encoder to h264, and it gives the same problem in the middle section.   When I render just the problem zone, just about a minute's worth of video, it renders correctly from premiere or media encoder.   I also tried rendering the timeline before sending to export.  That made playback faster, but didn't change the export problem.  All cache files are stored on the project drive, which has 1.5 terabytes open space, it shouldn't be a cache issue. (although that is another issue I'm having, with choppy playback... I just need to fix this problem first)

This is driving me crazy.  What is going on?  How can I get this file exported in a small file size for online posting?

 

MacBook Pro 2023, apple M2 pro chip / 16g memory

OS14.2.1

 

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1 reply

Kevin J. Monahan Jr.
Community Manager
Kevin J. Monahan Jr.Community Manager
Community Manager
February 13, 2024

Hi @natashab82106007,

Thanks for the case notes. I suspect that the issue lies with the source file. How was this footage originally acquired? Is it from a video camera, a DSLR, a mobile phone, a drone, or a screen capture? Let me know. The key is that the transcoded file is working, so I think that will probably be the solution for you. I must resort to that workflow when my source footage is questionable (read: when I use footage from my iPhone!). If you have a ProRes master, you can always send that back through Media Encoder for your H.264 copies for upload. That is what I end up doing. It works every time. Let me know if you need any help with that.

 

Thanks,
Kevin

Kevin Monahan - Sr. Community and Engagement Strategist – Adobe Pro Video and Audio
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natashab82106007Author
Participant
February 13, 2024

Thanks Kevin - the footage is all from professional-level video cameras, I don't know exactly which models but it was done at a pro level.  I recieved a drive with all the original mov files.   The odd thing is that all the footage across all 3 sequences is from the exact same cameras, the ones in this one sequence are the only ones causing trouble.  The precise shots that are getting ruined in export are from 2 of the cameras, but there's no difference in these files from any others.  And as mentioned, if I render this problem area isolated it looks fine, it's when it's in the middle of the 8-minute sequence that it gets blurry.   And the footage used earlier and later (from the same source file) in this one timeline is fine too.

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