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Timeline render bit rate vs Compressor quality

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Adrian Makai
Timeline render bit rate vs Compressor quality
on Aug 26, 2011 at 8:45:09 am

Hi All,

Hoping someone could chime in on this admittedly basic question...

I have 10-bit HD footage but to avoid frame stuttering, I set my FCP timeline to render in 8-bit. My question is - when I send to Compressor, does Compressor use the original 10-bit footage or does it start with the 8-bit rendered footage in FCP and do its transcoding from there?

Obviously I want to maximize the quality. Do I have to first re-render my FCP timeline in 10-bit before sending to Compressor in order to maximize quality in Compressor's final output?

Thanks for any help!


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Rafael Amador
Re: Timeline render bit rate vs Compressor quality
on Aug 26, 2011 at 10:55:33 am

If you "Send to Compressor", the time-line will be rendered with the bit depth of you sequence before reaching Compressor.
Your 10b stuff wil be crunched to 8b.
rafael

http://www.nagavideo.com


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Jerry Hofmann
Re: Timeline render bit rate vs Compressor quality
on Aug 26, 2011 at 12:09:14 pm

Change the setting back to 10 bit rendering... Then don't even bother to render it. Just send the unrendered sequence to Compressor. Compressor will add the filters and effects during the compression to your delivery format actually saving a digital generation (that skipped render).

Jerry


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Bret Williams
Re: Timeline render bit rate vs Compressor quality
on Aug 26, 2011 at 2:18:49 pm

I believe it should do that no matter what the sequence settings. It's supposed to skip the intermediate render and render straight to mpeg 2 from the source 10 bit HD files. Sequence settings, rendered or not, should be ignored. That's why it's so ridiculously slow, no?


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Jerry Hofmann
Re: Timeline render bit rate vs Compressor quality
on Aug 26, 2011 at 2:27:24 pm

It should do that, but it doesn't... it reads the render files if they exist.
The slowness will be even a bit slower with unrendered material too.

Jerry

Apple Certified Trainer, Producer, Writer, Director Editor, Gun for Hire and other things. I ski. My Blog: http://blogs.creativecow.net/Jerry-Hofmann

Current DVD:
http://store.creativecow.net/p/81/jerry_hofmanns_final_cut_system_setup

8-Core 3.0 Intel Mac Pro, Dual 2 gig G5, AJA Kona SD, AJA Kona 2, Huge Systems Array UL3D, AJA Io HD, 17" MBP, Matrox MXO2 with MAX - Cinema Displays I have a 22" that I paid 4k for still working. G4 with Kona SD card, and SCSI card.


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Adrian Makai
Re: Timeline render bit rate vs Compressor quality
on Aug 26, 2011 at 4:14:04 pm

Thanks guys!


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Rafael Amador
Re: Timeline render bit rate vs Compressor quality
on Aug 26, 2011 at 4:53:56 pm

Does matter the Bit depth/Color space (8bRGB,8/10b YUV), set in FC.
[Jerry Hofmann] "Compressor will add the filters and effects during the compression to your delivery format actually saving a digital generation (that skipped render)."
Not really.
Compressor can´t do nothing inside FC.
FC does all the time-line work (effects, motion), just skeeping the Sequence Codec compression.
FC hands Compressor an Uncompressed 4.4.4 with the bit depth SET IN THE FC´s RENDER OPTIONS.
Compressor will do what you haveset on Compressor: resizing, time-base changing, deinterlacing, MPEG-2, H264,..


[Jerry Hofmann] "actually saving a digital generation (that skipped render)."
If you were working in 10b Unc, the only thing you skipp, is a 444 to 422 downsampling.
In the other hand you will waste time.
If you send to a double-pass MPEG-2, FC must render your sequence twice. If you send to a multi-pass H262, will be rendered three times.

The best: Set render ALL YUV in high prcision, export a Self-contained 10b Unc, and import to Compressor.
rafael

http://www.nagavideo.com


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Bret Williams
Re: Timeline render bit rate vs Compressor quality
on Aug 27, 2011 at 5:04:20 am

See, this is why FCX can bite me. We are STILL learning all the bugs, oddities and workarounds in FC7! I don't have time to learn all new bugs and workarounds! :)


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Jerry Hofmann
Re: Timeline render bit rate vs Compressor quality
on Aug 29, 2011 at 12:37:26 am

Let me be clearer then. The computer renders the filters etc during the compression process.

Jerry

Apple Certified Trainer, Producer, Writer, Director Editor, Gun for Hire and other things. I ski. My Blog: http://blogs.creativecow.net/Jerry-Hofmann

Current DVD:
http://store.creativecow.net/p/81/jerry_hofmanns_final_cut_system_setup

8-Core 3.0 Intel Mac Pro, Dual 2 gig G5, AJA Kona SD, AJA Kona 2, Huge Systems Array UL3D, AJA Io HD, 17" MBP, Matrox MXO2 with MAX - Cinema Displays I have a 22" that I paid 4k for still working. G4 with Kona SD card, and SCSI card.


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