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Jerky video

Hi,

I'm owner of 2 laptops, Windows 10 I7 9750h 6 core, 16 GB Ram 2666 Mhz, SSD Nvme 512Gb and RTX Nvidia 2060 6gb, and macbookpro late 2013 I7 16gb Ram, Flash Memory, with gt750 2gb

If i try to play a video from MAC it run smootly but if i play the same video from the other pc it goes jerky.

On the paper the windows pc is more powerful than the mac, and i can't understan why.

Any suggestion for me?

Thanks

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  • It may depend on the codec and other aspects of the file. I can't really say since you haven't provided details. Please do so.


    It's not clear how you're determining playback appearance.

    It's not clear if you've looked at CPU use during the file playback which could indicate decode abilities.

    It's not clear which version(s) of Wirecast you're using.

    Please provide details and I can help analyze the issue. 

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  • Thanks CraigS.

    The file is an 1920x1080p.

    The file is a simple sync test audio/video and there is a ball running aroung a circle- The codec is the H264  and when i play it on second screen (projector) from the Windows 10 I7 9750h 6 core it goes a little bit jerky.

    "It's not clear if you've looked at CPU use during the file playback which could indicate decode abilities." What about that?

    I'm using the last versione of Wirecast 13.0.1 on both laptop.

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  • Dave Sasso said:
    "It's not clear if you've looked at CPU use during the file playback which could indicate decode abilities." What about that?

     Your CPU% in Task Manager or Wirecast?

    Dave Sasso said:
    when i play it on second screen (projector) from the Windows 10 I7 9750h 6 core it goes a little bit jerky.

     That would be using the GPU. Please do a local recording and look at the file in Windows Media Player.

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  • I've attached a screenshot of my "Task Manager" and 2 videos. The first, called  "Sync_Audio_Test.mp4", this is the file i was talking about, then the second "MyStream_2_RAR.mp4"(about this, is a rar file but i had to rename the extension of it in mp4 otherwise i wasn't able to attach it for the form restrictions) is the recording done with Wirecast record. If i try to play "Sync_Audio_Test.mp4" by VLC it goes smoothly but, if i try to play "MyStream_2.mp4"(the name is different because it is the name inside the RAR) it goes jerky.
    Help me solve it please.

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  • Dave Sasso Sync file seems like a fairly normal H.264. The key frames seem to be 5 seconds apart. Overall CPU% is reasonable so the computer isn't being stressed.

    The Sync Audio Test file is 30fps and the MyStream file is 60fps so changing the frame rate would be an issue. 

    Frame rate into through out should remain the same otherwise you can get motion artifacts.

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  • Dave Sasso 

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    • Thanks again CraigS, but remains the fact that the mac runs the same file more smoothly.  The registration file could be wrong for my recording setting error, but it plays as the video you saw (a little bit jerky). Maybe i need to change the fps of live on wirecast preference? Or you were talking about the registration setting?

    PS: What kind of program did you use to inspect files?

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  • Dave Sasso 

    Dave Sasso said:
    What kind of program did you use to inspect files?

     

    Dave Sasso said:
    but remains the fact that the mac runs the same file more smoothly.

     How they handle the frame rate change may be different.
    Frame rate should be the same end to end.
    If source is 30fps, then Wirecast > Preferences > Advanced > Video Display Rate should be 30fps and the encoder should be 30fps.

    Then you would check the test recording. Wirecast's recorded/streamed frame rate may vary slightly from the target but that's done to maintain smooth motion (avoiding dropped frames/jerky video).

    The only way to compare the two computers would be to compare the two recordings. Ideally MJPEG MOV on Windows and Apple ProRes MOV on Mac (avoids potential H.264 compression related issues).

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