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Bitrate = Resolution?
Ive been having a bit of trouble determining which export codec to use mainly because ive been tempted by a uncompressed 8bit codec which changes the look of my footage but is 30mb/s than another which retains the original quality but is uncompressed 8bit 20mb/s, which is being transcoded from compressed 8Mb/s 10bit Ycbcr footage. What effect does bitrate have on resolution or image quality in general? Any advice on what do to in my situation?
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3 Replies
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Export for what purpose? Uncompressed is seldom necessary since the original DV AVI is compressed. As is HDV. You can’t make it look better by uncompressing video. But if you are re-editing after the export, that’s different.
The word resolution is usually applied to the number of pixels, like 720X480. The higher the data rate the less likely you will have quality loss. Up to a point. Going to a higher data rate thatn the original footage seldom solves anything.
Going from 8 bit to 10 bit is useful when applying effects, especially color correction.
So, perhaps if you explained what you were attempting to do, we could be useful.
Steven
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I started a project getting 35mm telecined to PRORES HQ format to use on FCP, however i am forced near the end of my project to export my files to a windows compatible format (since prores is proprietary). It is my understanding that prores is 10bit compressed, and i tried exporting to uncompressed 10bit, but premiere did not accept the file, it would only accept 8bit. Im trying to find a codec that will minimize the quality loss but i dont see any codec that can do so. I currently having to jump between after effects and premiere, where either program will accept some prores files and not others, and there doesnt appear to be any pattern why.
So basically its already been color corrected initially in telecine, and fx are done afterwards, but since is having to had the source files changed from 10bit compressed to 8bit uncompressed. It works, so i cant complain there, but at what cost?
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What is being done in Premiere? There are lots of choices that are cross-platform.
If there is 3rd party hardware on Premiere, use a codec for the hardware (AJA cards can accept 10-bit encoding). A universal, lossless codec is PNG compressed QuickTime (8-bit). Film folks sometimes prefer file sequences; TGA is the most reliable (also 8-bit), and works on Premiere and Discreet (Flame/Fire/Inferno), though FCP doesn’t play well with sequences. If the footage is not coming back to you from the Premiere side, there might be other choices that are better.We still want more info… ;>)
-jeff
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