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Thread: Video playback with Audio. Sync error?

  1. #21
    Ah ha! Ok used the divide settings as mentions above and that is a fantastic improvement!

    Richard, if you don't mind explaining: if you use a frame playback rate of 30fps, monitors 60Hz, and use the 1/1 setting (60fps) do i then need to re render the content to 60fps? Sorry I don't really understand what the 1/1 or 2/1 do.

    Same for 25fps..
    Set monitors to 50/75Hz and use setting?

    Despite never seeing the stat hud move so fast there where no drop frames when quickly testing this morning. Will continue testing.

    For the show i was going to use the TH2G outputting two 800x600 windows (one to ImagePro/R7 LED, other to LX41). If this is not a good idea then will look at one output and two ImagePros for locating the content.

    Thank you!

  2. #22
    you dont rerender - playback movie rate stays the same

    but it does run my playback engine at 60fps or 50 or 75fps - which means the threshold for overloading graphics card is much lower- much less time to decode and render things on screen

    so you have to reduce number of layers by at least half - on older graphics cards - it doesnt work so well at all.

    output screen video timings are critical with audio

    dont mix screen output sizes

    -

    if you want no drop frames playing audio - the frame rate at all stages of playback and screens and output screens needs to match exactly- not just on mac but in entire video system.
    not 50/60 exact - but 59.94Hz 60.02Hz 75.03Hz exact

    using well defined PAL -720p and 1080p frame rates - NOT vga or dvi frame rates or triple heads - is usually best - vga/dvi timing are off by quite a lot for audio. ( 1/1000)

    800x600 is ok at 75Hz - but not through a triple head


    Quote Originally Posted by pip View Post
    Ah ha! Ok used the divide settings as mentions above and that is a fantastic improvement!

    Richard, if you don't mind explaining: if you use a frame playback rate of 30fps, monitors 60Hz, and use the 1/1 setting (60fps) do i then need to re render the content to 60fps? Sorry I don't really understand what the 1/1 or 2/1 do.

    Same for 25fps..
    Set monitors to 50/75Hz and use setting?

    Despite never seeing the stat hud move so fast there where no drop frames when quickly testing this morning. Will continue testing.

    For the show i was going to use the TH2G outputting two 800x600 windows (one to ImagePro/R7 LED, other to LX41). If this is not a good idea then will look at one output and two ImagePros for locating the content.

    Thank you!

  3. #23
    the reason why these things happen - is that when play audio is used-
    the real movie frame rate is used-

    the real movie frame rate might be exactly 30fps or 25fps -

    DOES NOT match the vga or dvi timings-

    vga/dvi timings are different at different screen sizes-

    they are 60.02 or 75.03 or 59.94 - very rarely exactly 75Hz or 60Hz

    so your movie is playing back NOT locked to the screen outputs-

    There arent any drop frames - or any stuttering - the frames are not being output locked to the screen output rate - so at certain times - usually every 30 secs dont have any chance to get displayed- as the movie playback goes out of sync with the screen rate


    you want to do audio and dropped frames are critical-

    you need to use single or dual output - at exact same size-
    do not use triple heads-
    do not mix monitor resolutions-

    use 1920x1080 or 1280x720 or 800x600 similar-

    run catalyst playback at 60fps or 50fps or 75fps -

    this give more of a chance for frames which dont line up with the screen refresh rate to get displayed.

  4. #24
    Join Date
    Oct 2004
    Location
    UK - Milton Keynes
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    Richard - a question:
    In a show scenario with some content with audio and some without

    - How do you change the playback from 'lock to screen div 1' back to a rate that works for the rest of the non-audio content using a non-audio playmode?

    Do you have to go and change it in the catalyst control window or via the web server?
    or
    should you just use the speed control to slow playback of the non-audio files?

    S
    Simon Pugsley

    SNP Productions Ltd. (UK)
    Lighting & Video Control Solutions
    Catalyst|Sales|Hire|Training|Support
    Catalyst Dealer UK Europe & Worldwide...

    Office: +44 (0)1908 410129
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  5. #25
    Quote Originally Posted by Mr_P View Post
    Richard - a question:
    In a show scenario with some content with audio and some without

    - How do you change the playback from 'lock to screen div 1' back to a rate that works for the rest of the non-audio content using a non-audio playmode?

    Do you have to go and change it in the catalyst control window or via the web server?
    or
    should you just use the speed control to slow playback of the non-audio files?

    S
    look in the safari activity log when you access the pull down menu in cat web server-

    changes the frame rate via web commands
    http://xxxyourcomputer.local.:8080/c...=61,0,500,31,0
    http://xxxyourcomputer.local.:8080/c...=61,0,500,32,0
    ...

    -

    the performance is far lower at 60Hz- its really only for emergencies when audio syncing is THE most important thing- or you have one or two layers
    normal shows will very rarely run well at 60Hz - if at all.

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