LARGE GPU vs. CPU Export quality differences in MPEG2 (and others?)
I noticed that encoding to MPEG2 (for DVD's) using the CPU (through Media Encoder) produces much better results than does the MPEG2 codec the uses the GPU. Just finished a documentary and was preparing it for DVD. During fades to black, I would get grey macroblock errors on the first full-black frame. Also the encode quality was very poor (mosquito noise, lots of pixelation, and the macroblock errors). Rather than exporting directly from the timeline, I decided to queue to Media Encoder (which on CS6, only uses the CPU). While this increased the render time from 20 minutes up to 55 minutes (for a 57-minute show), the resultant file was of much higher quality (less mosquito noise, no macroblock errors, MUCH less pixelation). Both of these encodes had the exact same parameters. Exact. With the Media Encoder render, the CPU was maxed properly at 99% and the GPU was only handling the RT Effects from the timeline and such, varying in the low percentages of its utilization. With the GPU direct timeline render, the CPU was working around 40%-50% and the GPU was utilizing about 50%-88% of its potential.
I also tried test renders changing from single-pass to two-pass encoding. Absolutely no difference. Results were visually identical with same issues in GPU encode. Also tried the usual tests with switching on and off various features (maximum render quality, maximum depth, etc.)
I'm assuming, as with many other compression programs, there are different codecs because of the different processor architectures (cpu vs. gpu).
Has anyone else seen whether this has been resolved in later versions (CC+)? Because while I LOVE the low render times, the quality difference is HUGE (with MPEG2 for DVD).
Thanks!
Intel 3930K
16GB RAM
GTX680 2GB
CS6
Win7/64 SP1
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