1. #1
    Alright I have this movie put all togeather using Sony Vegas but I can not get decent video quality without making it a huge file what can I do? Also can someone explain in easy terms how to turn 1/2 speed tracks back to full speed using virtual dub? Thanks for any help
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  2. #2
    Hi Brutal67

    you might want to check this topic. Lots of info that may help. As far as recording at 1/2 speed. Set Fraps for 15fps, then change the frame rate to 30 in virtual dub. In case you don't know, Fraps is what most are using to capture the raw film file. I for one have not found a Frap ver. that has 15fps as an option, only 20. So this may or may not be of any help.

    http://forums.ubi.com/eve/forums/a/t...8/m/7521069792
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  3. #3
    Did I not understad your words or did you say you couldn't find a Fraps version with 15fps as an option? Well, Fraps 2.0 has that option.

    Sorry, my english is not very good, maybe you didn't mean that.

    By the way, wich compression should I use when using VirtualDub? MPEG-4 V3 is all right? Any better choice?

    Thank you!
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  4. #4
    Originally posted by Ala11_Izan:
    .....
    By the way, wich compression should I use when using VirtualDub? MPEG-4 V3 is all right? Any better choice?

    Thank you!
    I recommend that you use DivX compression...you must first have downloaded and installed the DivX codec(it's free). Once you have DivX on your harddrive, VirtualDub will automatically show it as an option for compression, BUT your original movie must be in a pixel size in which both the height and width dimensions are divisible by 4.

    Another codec is XVid...sometimes, though, the installation of XVid codec can be difficult or have errors.
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  5. #5
    Thank you Fliegeroffizier, I already have those codecs in my computer so I will use DivX next time and I will check the results.
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  6. #6
    "Did I not understad your words or did you say you couldn't find a Fraps version with 15fps as an option? Well, Fraps 2.0 has that option.
    "

    Yes that's what I meant. I have Fraps 2.5.4 bulid 4305. There is no option for 15 fps. It's has 20,25,30,40,50,60 under the movies subgroup. Maybe it was removed in a earlier ver.? Don't know and haven't found a vers with it.
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  7. #7
    Change the FPS to 40 in VirtualDub to get back to normal speed. When Sony Vegas renders the finished movie, it should 'capture' everything to 30 FPS, irregardless of the original FPS.
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  8. #8
    hi gyro, hi jarink, hi all,

    the settings have been changed at some point between v2.2 and 2.5, imo. i also miss the option of 15fps-recording in 'fraps'!

    reducing the framerate by undividable factors may lead to stuttering playback though... which means:
    first case - rendering is done with all frames are key-/fullframes. the options for reducing the framerate are then dropping frames or merging frames by interpolation. the first is probably the best possibility for reducing by half (like 50 -> 25fps), for reducing from 40 -> 30fps most editors drop every 2nd to 3rd frame by default, which can be seen in output clearly (and is easy to check: just open a 40->30 red video in 'vdub' and play frame by frame) . merging requires a lot of work for resharpening (if ever can be done) and is normally usewd as a substitute for blurring, not to reduce framerate (hard to find non-pro apps for that anyway, also takes a lot of render-time)

    second case - the framerate will be reduced in the final compression step by using motion-vector based compression (like 'wm9' or 'divx'). that means, all the editing steps have to be done with the frame-overload. compressing the footage at the beginning is not suitable, because the fps-reducing requires really a lot notice and some uncommon settings. so far i haven't found a 'receipt' for myself, also the updated versions of fe 'divx' seem to change some matrices out of the limit of my understanding
    anyway, this sysiphus-work of bidirectional settings is annoying...

    what else is left is either to record at halfspeed-playback/25fps, speed it up to 50fps and reduce it again to 25fps (might be helpful in some cases, when the game demands a lot of cpu, like smoke, ships, etc, for the absolute time to display such will be reduced). of course the smoothing effet is lost...
    or recording at 20/25fps, speed it up and keep it at 40/50fps, which means more file-size and - in some cases - also bad playback due to computer-power.

    however, the question of reducing the framerate by other than 2 is not trivial! it fills books by the example 3:2-pulldown for delivering to ntsc.
    and so it stays to hope, that 'fraps' will offer 15fps again in the future - maybe it can even be done already by changing some reg-settings.
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  9. #9
    maybe it can even be done already by changing some reg-settings.
    Hi Deepo,

    Thanks for the info. I searched the reg for fraps and didn't see a obvious reference for frame rates. Fraps keys show under fraps and fps1. Course it could be under some other name.
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  10. #10
    Hey, deepo! That would explain some jitter problems I've seen, although it's not usually noticeable. Wouldn't you have a similar problem increasing a 25fps clip to 30fps? Instead of removing frames, it would have to create them somehow, it seems. Would frames have to be duplicated or interpolated somehow? Seems like you'd see the image 'hang' a bit if that's true.

    Anyone out there have an old copy of FRAPS that supports 15fps? (Free version is fine by me)
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