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Thread: rendering MP4 reduces quality and increases file size

  1. #1

    Default rendering MP4 reduces quality and increases file size

    I'm starting out with two MP4 files, both 1920x1080, 29fps, data rate approximately 16000kbps, dxva ac1 with aac audio. I have Sony Vegas Pro 9.0.

    What settings should I set in my project properties and/or render settings to preserve my original video quality? There was a lot of blocking the first time I tried rendering with the default MP4 settings (with the resolution jump to 1920x1080 being the only difference), and the second time I upped the max and average bitrate to 50,000,000bps and got a 1.13gb file, even though the two original files together didn't even add up to 600mb. The quality was still worse than the originals.

    I guess another way to solve this problem would be if there was a way to copy video streams from the original files over to the output. Is there a way to do that?


    Thanks for the help guys!

  2. #2

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    Quote Originally Posted by lostguru View Post
    I'm starting out with two MP4 files, both 1920x1080, 29fps, data rate approximately 16000kbps, dxva ac1 with aac audio. I have Sony Vegas Pro 9.0.

    What settings should I set in my project properties and/or render settings to preserve my original video quality? There was a lot of blocking the first time I tried rendering with the default MP4 settings (with the resolution jump to 1920x1080 being the only difference), and the second time I upped the max and average bitrate to 50,000,000bps and got a 1.13gb file, even though the two original files together didn't even add up to 600mb. The quality was still worse than the originals.

    I guess another way to solve this problem would be if there was a way to copy video streams from the original files over to the output. Is there a way to do that?


    Thanks for the help guys!
    From what i see Vegas and MP4 never liked themselfs. I also get a crappy quality when trying to export to MP4 - so what i do is either to render it as AVI or M2t and process it with WinAVi video converer to Mp4 - never lost quality !

  3. #3

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    Quote Originally Posted by maximquaye View Post
    From what i see Vegas and MP4 never liked themselfs. I also get a crappy quality when trying to export to MP4 - so what i do is either to render it as AVI or M2t and process it with WinAVi video converer to Mp4 - never lost quality !
    Ah, alright. That seems like a nice workaround. I'll test it out.


    Thanks for the fast reply!

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