Daniel Low
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The keyframes setting is basically saying ‘Force a keyframe every ‘x’ seconds’. Codecs will insert ‘natural’ keyframes when they see fit, at scene changes or when the difference between frames exceed a defined threshold. Forcing too many keyframes can have a bad effect on picture quality.
With the quality slider, if you choose a setting towards the ‘smoother’ end the encoder will drop picture quality in order to maintain a smooth frame rate, towards the ‘sharper end it will maintain picture quality at the expense of possibly dropping a frame or two. If you’re after high quality pictures then you’ll want to be in the range I suggested. At this kind of data rate you have to compromise.
The cropping I was suggesting was just a mild crop into the picture, to get closer to the ‘active’ picture not to change the aspect ratio.
Most cameramen still allow for an ‘action safe’ frame and the edges of the frame are sometimes ‘content redundant’ and as such can be discarded.__________________________________________________________________
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Can I suggest the following:
Keyframes every 10 seconds, (also try every 15 seconds)
Quality slider between 60% and 80%
Try a longer buffer delay.
Try B-Frames at 1 or 2
Have you applied any cropping?
Let us know how you get on.
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Sorry, I shouldn’t answer these things in a hurry when I’ve just woken up!
For a 30 second clip you need to average about 540k/bits per second (not taking any audio into account).
At that sort of data rate you’ll probably need to reduce your frame size to get anything like a decent picture. What sort of content is it that you are working with?
It’s not compressor that’s the problem here, it’s that you are asking rather a lot. Any application would struggle.
Anyhow, using Frame Controls will help you somewhat.
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1. Either
2. Either
3. Ask them if they want to deliver the file from a web server (HTTP) or from a Windows Media Server (MMS)
More here:
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What application are you using to compress?
What other settings are you applying? (Deinterlace, keyframes etc)
Shaky DV footage is is going to be a challenge whatever.
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This has been covered a lot in this forum, you need to search for Frame Controls. Ultimately you need frame controls on.
Your frame size is very odd and you need to set an explicit data rate – not sure what 0.512Mb/s is – maybe you mean 512Mb/s
Where did you get these settings from?
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Ed,
I have no answer for you. Many users of compressor (including myself) have ditched the application and moved on due to issues just like this.
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X264 is the best, according to expert tests. (and it’s free)
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Sure,
H.264 is a standard, just like MPEG-2. There are a bunch of implementations from various groups and commercial organisations that produce H.264 codecs.
A list is available here
Apple is to be praised for bringing H.264 to the masses long before Blu-Ray or HD-DVD, but they have been lacking in features and quality support, much in the same way that iTunes MP3 encoding quality is easily beat by encoders like LAME.
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Yup, that’s a good fix, however Apple needs to get on top of these faults, as well as building a class leading H.264 codec before too long, Quickime H.264 is the bottom of the pile for quality and profile/level support. Workarounds like this should not be needed at this level. QuickTime is the best format out there and Apple needs to pull their finger out. Quickly.
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Please post back saying what solved your problem. It could help others, and saying ‘thanks’ is free!