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Thread: Is video export limited to 4GB size?

  1. #1
    Member gru3d's Avatar
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    Is video export limited to 4GB size?

    Using Revit 2016, I've exported some quite large walkthrough to uncompressed video that should a bit more than 12GB size, however the resulting file was 4GB 4 GB (4295009792 bytes)

    The resulting video was messed up with several parts overlapped. Then I exported the walkthrough in several steps of about 1GB each piece and perfect, joined the video with ffmpeg and no problems at all.

    The drive is formatted in NTFS and I've got 8GB or ram so that shouldn't be a problem. Anyone else "tried" this? Weird issue nonetheless.

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    Moderator snowyweston's Avatar
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    I can't speak to video export directly (I only ever export frames from Revit) - however there are most certainly (undocumented AFAIK) performance limits in Revit - with there most definitely being a maximum exportable image-size threshold, so I can only suppose you've found the limit for videos.

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    Forum Co-Founder Twiceroadsfool's Avatar
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    My guess is you dont have enough system resources for it to temporarily *hold* the video in Memory, while its still processing. Ive seen Revit fully render an image on screen, then fail to export it, when the computer didnt have enough RAM. Same version of revit, same model, same rendering, same resolution (on a computer with more RAM), and suddenly it was successful. 8GB of ram isnt that much at all, especially considering that Windows and running Revit itself will require a chunk of that.

    Like Snowy, i dont think i would ever trust Revit to export an entire video that was that long, when you could export it as frames, and then stitch it together elsewhere (which has many more upsides). But with a single video export, you run the risk of anything going wrong (heck, a power failure even) sacking the entire video.

    But, i would look at Hardware first. I think youre lacking in the RAM department, for making exports that large.

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    Member gru3d's Avatar
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    Quote Originally Posted by Twiceroadsfool View Post
    My guess is you dont have enough system resources for it to temporarily *hold* the video in Memory, while its still processing. Ive seen Revit fully render an image on screen, then fail to export it, when the computer didnt have enough RAM. Same version of revit, same model, same rendering, same resolution (on a computer with more RAM), and suddenly it was successful. 8GB of ram isnt that much at all, especially considering that Windows and running Revit itself will require a chunk of that.

    Like Snowy, i dont think i would ever trust Revit to export an entire video that was that long, when you could export it as frames, and then stitch it together elsewhere (which has many more upsides). But with a single video export, you run the risk of anything going wrong (heck, a power failure even) sacking the entire video.

    But, i would look at Hardware first. I think youre lacking in the RAM department, for making exports that large.
    Yes, I think that was the problem. Exporting a 3-minute video at 25 FPS at 1024x768 is quite a demand. I though the video was being written to the file as it was generated, however the exact 4GB size suggests me that the problem may lay elsewhere. Maybe Revit takes for granted that you may export to a FAT32 pendrive or maybe that's because the program executable is 32-bit so can only handle up to 4GB of size.
    Last edited by gru3d; July 1st, 2016 at 04:23 PM.

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    Moderator snowyweston's Avatar
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    Quote Originally Posted by gru3d View Post
    at 1024x768
    Word of caution, work with 16:9 ratio'd dimensions - then you'll be able to edge-to-edge fullscreen on widescreens

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    Member gru3d's Avatar
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    Quote Originally Posted by snowyweston View Post
    Word of caution, work with 16:9 ratio'd dimensions - then you'll be able to edge-to-edge fullscreen on widescreens
    I know, I know. I did it 4:3 because the video was for a demonstration using the projector NEC U250X, which has 1024 x 768 pixels.
    Last edited by gru3d; July 2nd, 2016 at 10:51 AM.

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