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M
Mark of WA
Participating Frequently
July 18, 2021
Answered

H.264 and H.265 audio gaps and sync errors on export on M1 MacBookPro

  • July 18, 2021
  • 2 replies
  • 1860 views

The video source is Sony XAVCS 4k and audio being used is the original audio from the video. 

The only purpose for editing in Premier Pro is color grading and trimming. 

In the timeline, audio is perfectly in sync and perfectly intact all the way through the video to the end. 

After exporting to H.264 and H.265 in 4k with hardware accelleration enabled, the audio has been damaged with sections of it missing entirely, and very out of sync by the middle of the video. I have tried several PP presets with hardware accelleration. None fix the problem. 

Never had problems like this with Sony source video before on this M1 Mac, or on an Intel coreI9 Mac. This looks like a newish bug in the video export encoder. 

Export time with hardware accelleration enabled is about 17 minutes for 30 minutes of video. 80 minutes plus to render in software.

This topic has been closed for replies.
Correct answer Phillip Harvey

Did you already try the Software Encoding? That would be my first suggestion even though it does take longer. The Software Encoding tends to be more accurate and have fewer issues anyway and I prefer to use that for my final renders (if I'm going straight to H264).

2 replies

P
Community Expert
Phillip HarveyCommunity ExpertCorrect answer
Community Expert
July 19, 2021

Did you already try the Software Encoding? That would be my first suggestion even though it does take longer. The Software Encoding tends to be more accurate and have fewer issues anyway and I prefer to use that for my final renders (if I'm going straight to H264).

    M
    Mark of WAAuthor
    Participating Frequently
    July 19, 2021

    Software encoding did work, but what a shame to wipe out all the performance advantages of an M1 Mac by making it run very hard with fan blasting away for five times as long. It's hilarious that YouTube manages to get good quality transcodes out of iPhone Pro Max's in less time without all the fuss. What's missing from their ingestion steps that have kept me using PP is color grading. With so many other hassles in PP workflows, I avoid PP when I can. 

    P
    Community Expert
    Phillip HarveyCommunity Expert
    Community Expert
    July 19, 2021

    Yeah, everything has its pros and cons.

      M
      Michael Grenadier
      Legend
      July 19, 2021

      have you tried smart rendering?

      https://community.adobe.com/t5/premiere-pro/faq-what-is-smart-rendering/td-p/10648488?page=1

      Although it may seem that your workflow will take longer, it can actually be a timesaver.  It's saved my bacon a few times and allows you to sometimes pinpoint exactly where the problem resides.

      M
      Mark of WAAuthor
      Participating Frequently
      July 19, 2021

      Smart rendering is not a solution for PP correctly exporting simple edits on single video clips. I'm not going to bloat two hours of Sony video that's great in its original form and handled quite well by YouTube and Vimeo just to work around a buggy PP H.264 and H.265 encoder stage to export the color graded and trimmed footage. I'd sooner cancel the PP subscription and shift to Davinci. 

      M
      Michael Grenadier
      Legend
      July 19, 2021

      You might take a short clip and test how long it takes to do a smart render and then export vs directly exporting.  You might be surprised...    And there are plenty of problems with DaVinci including it's lousy interface.    And have you actually tried your workflow in Resolve?  It's possible it might have the same or some other problem.  And you talk about never having this issue on an intel mac.  Have you actually tried this workflow on the intel mac?    

       

      How many audio channels does the camera original have and do you need all of them?  select a clip in the browser and go clip: modify: audio channels and turn off any audio channels you do not need.   Then edit the clip into the timeline.  I have had issues with audio channel configuration with material shot on sony cameras.   

       

      And if this is a new problem without any changes in the hardware or the macos, I suggest you revert to the previous version of Premiere that works without issues.    One of the great things about Premiere is the ability to keep various versions available.  I have on a few occasionals had multiple versions of Premiere open at the same time.  

       

      If you want to explore some other ideas for troubleshooting and workarounds, post back.  I have a few ideas.   

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