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Final Cut X Rendering with artefacts no matter what codec
Hi everyone,
I have 2 problems while rendering out of Final Cut X.
Artefacts & Controlling the H264 bitrate:
Artefacts:
What I’m rendering has a moving/shaping color background, which gets rendered with wave like artefacts, which can be seen especially in the lower center part if the screen, here is the example (you’ll have to watch in on the youtube page to see the artefacts):
https://www.youtube.com/watch?v=Q5CbYbLQyl4&list=UUrd1CtzghClDPpnu7CNn1Vw
It doesn’t matter if I use H264, ProRes HQ or even if I export uncompressed, always get the artefacts…
This backround image is an included with Final Cut X Apple Generator, so it should be flawless…
Could this be a bug or poor implementation from Apple?
Bitrate:
How can I control the H264 bitrate, there is a setting that you can set for a max bitrate, but you can’t set a minimum or a constant bitrate
So my questions are:
1. How do I render without artefacts?
2. How do I control the bitrate?
3. Does the bitrate matters for digital projection in a cinema, as long as the image looks fine on your computer screen?
Thanks
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16 Replies
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[Andrei Popa] “(you’ll have to watch in on the youtube page to see the artefacts)”
Hmmm… what does that fact tell you?
Exactly. It’s an error on the part of the YOUTUBE encoder. It has nothing to do with FCP. I for one saw no artefacts of any kind.
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The youtube is just an example, so people can see the artefacts.
The error is in the original file I rendered on my computer as well, it comes out like that when FCPX renders it.
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I don’t see how, if the master file doesn’t show the artefacts, it could be an FCP issue.
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[Andrei Popa] ” which gets rendered with wave like artefacts”
I’ve seen this on stuff rendered out of many apps, after effects, FCP, Pr etc. I forget exactly what causes it, but try dropping a gaussian blur on the BG and play with the strength (to shouldn’t need too much) and see if that helps.
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~ My FCPX Babbling blog ~
~”It is a poor craftsman who blames his tools.”~
~”The function you just attempted is not yet implemented”~ -
Did you look at the video? Nice smooth grads. I didn’t see any problems either.
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[Bret Williams] “Did you look at the video? Nice smooth grads. I didn’t see any problems either.”
I can only assume he means in the lower res/quality versions directly on YouTube. In which case, as I said, that’s not an FCP issue.
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Which is precisely why I asked Charlie the question.
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Which is precisely why he wrote “(you’ll have to watch in on the youtube page to see the artefacts)” because you (and he) can’t see the artefacts in that (full res) version.
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Charlie never said that. He said “I’ve seen this on stuff rendered out of many apps, after effects, FCP, Pr etc. I forget exactly what causes it, but try dropping a gaussian blur on the BG and play with the strength (to shouldn’t need too much) and see if that helps.”
And SO, I asked him if he had actually watched the youtube video which looks completely fine. So there is no need to do what Charlie suggests, unless his view of the video was different or he was just going by the OP description and the horrible looking freeze frame youtube is showing.
It looked crystal clear in 720p here.
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[Bret Williams] “Did you look at the video? Nice smooth grads. I didn’t see any problems either.”
I did, the blob edge gradient looks fine at 720 on YT, but I think I see what he’s talking about if you look at the non-colored area. (kind of moving graininess?) That’s why I suggested a slight blur. Honestly I don’t know where in the chain it’s coming from, it may well look like that in the generator source and just not show up in the X UI.
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~ My FCPX Babbling blog ~
~”It is a poor craftsman who blames his tools.”~
~”The function you just attempted is not yet implemented”~
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