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Compressor not restricting data rate.
I have some clips I need to export to the web using H.264, and I’m using Compressor. I need to have the data rate restricted to 1500kbits/s for the site. I’ve set it that way in Compressor. The trouble is, the video file always comes out with a data rate of 3mb/s (3000kb/s) or right around 3. I’ve tried it through a custom-made droplet and just doing it regularly though Compressor. I’ve verified multiple times that everything is set correctly, and I’ve tried it on multiple computers (Two 8-cores and a Quad). Tried trashing Compressor plist, restarting and making a completely new setting.
Here are the settings I’m using:
Best Quality Audio 48k
Video- QT, 720×360, Pixel Aspect Ratio: Square, Crop: None, Padding:None, Frame Rate 100% of source, H.264 Codec, Multi-pass, Average data rate 1.536 (Mbps), Fast Start on Compressed Header, Watermark.
Thanks in advance.
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13 Replies
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I’m running comparisons in Quicktime and Compressor now. If I set the “Restrict data rate” in Compressor to 1500kbps, the Quicktime file I get is actually around 3mbps. If I set it in Compressor to 750kbps, The Quicktime file I get is 2.3mbps. By setting it in Compressor to a meager 100kbps the Quicktime comes out right around 1500kbps, but it looks really awful. I can get it pretty close to what I want by setting Compressor to 300kbps, and the Quicktime comes out at around 1800kbps, which I may be able to get away with, but I’d still like to know what exactly is happening.
Any ideas?
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Can you confirm that you are using CBR, not VBR in compressor?
How did you arrive at a frame size of 720×360?
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I don’t really know, there doesn’t seem to be anything regarding variable or constant in Compressor, only a restriction. And I think it’s logical to assume that means “Don’t go above x amount.”
As for frame size, I’m working from a RED proxy that was originally 1024×512 (the medium one), and I needed to make it smaller for the web, so I made it 720×360 in order to keep the same 2:1 ratio.
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My bad, there is no CBR/VBR for H.264.
Can I assume that you have tried setting both the Average and Maximum datarate sliders to 1500kb/s?
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Well, I have only two options for data rate: “Automatic” and “Restrict to”, for which you can type a numerical value. No sliders anywhere.
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I think you are looking at the Quicktime export windows options, not in compressor. What version of compressor are you using?
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I’m using the latest version of Compressor. I’m looking in the Video Settings under the Encoder tab in the Inspector window.
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OK. Have you tried the alternative H.264 method as described in chapter 11, specifically on page 155 of the compressor user manual?
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It looks like that method that’s in the manual is only for the DVDSP method of compression. I can’t seem to alter frame size or change audio settings.
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Sorry for the double post, but I forgot to add that I need to have it be a Quicktime movie, and that’s another reason I can’t use the DVDSP method.
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