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  • Problems rendering out from AE

  • Francis Hughes

    September 3, 2008 at 1:51 pm

    Hi,

    Im having major problems rendering out from AE, the save ram preview works and also selecting quicktime DV PAL however when I try to go to uncompressed 10bit or 8bit (which is what I would prefer) or even the Animation preset quicktime wont play it. Final Cut does not even like it, both programs will play the first 2 seconds then it freezes and the play head just skips to the end. However just to make things even more confusing, if I just click along the timebar all the animation seems to be there? Ive tried the custom quit and restart, even turned of my computer a few times, no joy.

    Very confused any help would be awesome.

    P.S On a mac g4 powerbook

  • Kevin Camp

    September 3, 2008 at 7:19 pm

    i think your uncompressed/lossless files are exceeding the data rate of your drive.

    you may want to render to the codec that you are using in your nle… ie, if you are editing dv footage, you may want to render from ae as dv with the same data rate (dv25, dv50, etc)…

    Kevin Camp
    Senior Designer
    KCPQ, KMYQ & KRCW

  • Francis Hughes

    September 3, 2008 at 9:48 pm

    Hi Kevin,

    The animation is only 10 seconds long and at uncompressed it comes out a under 500 mb i dont have any trouble playing uncompressed files normally. FCP exports for example play fine. Is there anything else it could be?

    If i went out at dv 25fps into final cut then as this is most likely for web go to flash or mpeg how bad will the DV compression be given that it was already DV in the first place going to dv again from AE then to whatever after is going to result in lots of pixels?

  • Kevin Camp

    September 5, 2008 at 12:26 am

    you mentioned that the pal dv file played fine, but the uncompressed files started to play and then froze on a frame and then skipped to a later frame but kept pausing… this is exactly what would happen if the files data rate exceeded the data rate of the drive.

    due to the compression of lossless files it is possible to have some files that can play out fine and others that cannot. for example, if i had a simple white square that moved from side to side across a black screen for 30 seconds, the file size and data rate would be small. if i had full frame video of a pan across a city street (or something busy) for 30 seconds, then the file size and data rate would be much larger. this is due the the compression of flat color areas in the lossless animation codec. footage with more flat areas of color will compress more than footage with lots of tonal information, therefor the data rates can very significantly.

    500 mega bytes for 10 seconds, works out to be 50MB/second. that’s a pretty hefty data rate. dv25, for example, has a data rate around 3.5MB/second. a 10 second clip would be around 35MB.

    what do you normally capture your footage as in fcp? if it is through your firewire port on you laptop then it is most likely dv25 or dv50. i’m just suggesting that you try a codec that compresses the file further, to give you a more forgiving data rate so you can play things in real time.

    if you don’t need to work with the footage in fcp in realtime, then you should be able to stay lossless. as you noticed when you go frame by frame on the lossless file, the frames are there, they just don’t playback in realtime. so the frames will be there in the end when you create your final piece to get ready to compress to mpeg or flv.

    Kevin Camp
    Senior Designer
    KCPQ, KMYQ & KRCW

  • Francis Hughes

    September 5, 2008 at 10:32 am

    Hi Kevin,

    Wow great post that explains it excellently. I think i will export as dv25 for now just so i can see it in fcp so i dont go mad with the colour wheel of death. I usually go through firewire into final cut, and as I say no problems with fcp playing 13 gb quicktime files. Ive got a friend with a newer machine so I will try playing it on his. I will go with your suggestion of using the lossless file and just not playing it in rt. Thanks again for taking the time to go in to so much detail and explaining it to such a simpletons level greatly appreciated!

  • Evan Hsu

    March 4, 2010 at 4:25 pm

    having problems ram previewing my final piece at college the computers are powerful and i have got enough ram but every time I ram preview it stops half way through. On my laptop at home it works but on the dell exps at college it keeps on pausing. It is frustrating me no end I got it to work twice by ram previewing individual parts of the film have got but that was frustrating but did work. Buy now every time i ram preview it either crashes or just doesnt preview to the end. HELP?

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