MPEG STREAMCLIP Not Keeping MBPS

Discussion in 'Digital Video' started by DigitalWorlds01, Feb 11, 2015.

  1. DigitalWorlds01 macrumors newbie

    Joined:
    Mar 11, 2014
    #1
    Second Try:

    Been using MPG Streamclip for a large digitizing project at home. For the most part the program is working fine -- until I get to my Star Trek DS9 discs.

    My issue is that when I assign a Limit of 7 MBPS, the program basically downgrades the MBPS as its digitizing -- what should be close to 7 turns out to be far less at 4.43.

    I had no problems with limiting until I got to this series.

    Any ideas?

    My iMac 3.5 MGHZ, i7 intel core
     
  2. lostless macrumors 6502

    Joined:
    Oct 22, 2005
    #2
    what exactly is your end result? What are you trying to achieve? What format are you converting to?
     
  3. DigitalWorlds01 thread starter macrumors newbie

    Joined:
    Mar 11, 2014
    #3
    Greetings!

    My end result is that I wanted the program to stick as close as possible to the 7MBPS as possible; not the 4.43. I have done nothing different in over teh 600 discs I have burned. All have been stable around the 7mbps - except on these discs.

    I'm converting to MPEG-4.

    As A test, I converted 'Happily Divorced" at 10mbps -- and guess what, the finished files were either 10 or slightly higher.

    Can there be something embeded in the actual discs that when you extract -- and type of conversion to digital file would not work properly?
     
  4. lostless macrumors 6502

    Joined:
    Oct 22, 2005
    #4
    If your final format is mpeg4 (h.264?). Why are you concered about bit rate? Those bit rates were needed for dvd, but h.264 is a much more efficant codec and requires a lot less data for the same quality. I use handbrake to convert videos to mpeg4 and it uses a constant quality setting which will adjust the bit rate based off the videos complexity and makes the files as small as possible.
    My next question is why are trying to keep that high of bit rate if not nessasary in MPeg 4
     
  5. DigitalWorlds01 thread starter macrumors newbie

    Joined:
    Mar 11, 2014
    #5
    >If your final format is mpeg4 (h.264?). Why are you concerned about bit rate?
    If I dont use a good number of MBPS, the video gets pixelated too much.

    >I use handbrake to convert videos to mpeg4 and it uses a constant quality setting which will adjust the bit rate based off the videos complexity and makes the files as small as possible.

    Again, the picture will get pixelated if I don't use a decent amount. I do understand that the digital file wont be exactly the same; but I really dont want to see that many artifacts.

    But what about my original question -- any reason why the program would not keep the limit of what I'm requesting on these DVDs?
     
  6. lostless macrumors 6502

    Joined:
    Oct 22, 2005
    #6
    Truthfully, I have no idea why Mpeg stream clip is not keeping the bit rate. I haven't used it in years because it's very slow and never gave me consistent results and I hated guessing what bit rate to use (not very efficiant). There's nothing in DVDs that have any effect on the output.
    As for the pixelization, I highly recommend handbrake. As I said, it has a constant quality option as its default. In fact, it has removed the manual bit rate option years ago as it's pointless as the results would very from scene to scene. But the constant quality will analyze the video and give what bit rate it needs to represent the original video with as little bits as possible. Like a plain black screen or a scene with very little to no movement doesn't need as many bits to recreate the picture. If you set the CQ setting to 18, the picture comes out virtually identical to the dvd. (I have yet to notice much loss) It's one of the best free, Mpeg4 converter out there right now. Give it a try
     
  7. ColdCase macrumors 68030

    Joined:
    Feb 10, 2008
    Location:
    NH
    #7
    Handbrake provides consistent and artifact free video without worrying about what settings to use. It always uses the right settings.

    The only reason to constrain bit rate is if you wanted to force a smaller file size (to fit a video on a DVD for example) and can live with artifacts. For low action home movies there likely would be non. When I want to minimize file size more than what handbrake does well, I use a custom setting in compressor.

    I tried streamclip years ago and found it quirky and you just may have found one of its quirks. Dunno about the most recent version.
     
  8. giffut macrumors 6502

    Joined:
    Apr 28, 2003
    Location:
    Germany
    #8
    I ...

    ... suspect that the original DVD bitrate is only 4.43Mb/s to begin with, so MPEGstreamclip probably won´t top on that.

    That said: I strongly recommend handbrake, too. The encoding is so much better than what MPEGstreamclip can achieve. It does´t make sense to use it anymore.

    You can use the "normal" preset from Handbrake. It gives you a fast, but nearly perfect copy of your content with huge space savings.

    We tried many different encoding settings, but the "normal" preset is the most efficient one for us. We use it for encoding any DVD and Blurray media. Just for comparison: A 25GByte blurray movie compresses to about 4Gbyte, with hardly any quality loss.

    http://www.handbrake.org/
     

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