what am I doing wrong

Johnkl

Newbie Joined: May 07, 2017 13:48 Messages: 43 Offline

Solved by

Aug 22, 2018 13:26

I have PD16 and I'm processing 4K video (AVC format MP4)

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L5.1
Format settings : CABAC / 2 Ref Frames
Format settings, CABAC : Yes
Format settings, RefFrames : 2 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 16 s 320 ms
Bit rate mode : Variable
Bit rate : 91.4 Mb/s
Maximum bit rate : 106 Mb/s
Width : 3 840 pixels
Height : 2 160 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 25.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.441
Stream size : 178 MiB (100%)
Encoded date : UTC 2018-08-18 14:33:48
Tagged date : UTC 2018-08-18 14:33:48
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709

Audio: Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : mp4a-40-2
Duration : 16 s 320 ms
Source duration : 16 s 341 ms
Bit rate mode : Constant
Bit rate : 128 kb/s
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 249 KiB (0%)
Source stream size : 250 KiB (0%)
Encoded date : UTC 2018-08-18 14:33:48
Tagged date : UTC 2018-08-18 14:33:48

place the video in the time line, and doing nothing else...
go to produce, analyze with SVRT , with result the same result as the one from MediAnalyze saying 100% reduction saving

enable that profile and render(produce)

The produce screen shift to SVRT but the rendertime are pretty slow, say minutes depending of the lenght of the footage

If I deselect "fast rendering te...) the render time is much longer, so the SVRT seems to work...

Why does a 100% time reduction time still takes minutes ???

My hardware is Xeon E3 3.4Ghz, GPU Nvidia Quatro600

This message was edited 1 time. Last update was at Aug 22. 2018 13:28

Hatti

Contributor Location: Bonn, Germany Joined: Feb 21, 2017 15:54 Messages: 576 Offline

Aug 22, 2018 16:06

Maybe producing it to a ridiculously slow drive, like a SD-Card or a slow external HDD, maybe the same drive where the source files are, which reduces the write rate by half.

Hatti Win 10 64, i7-4790k, 32GB Ram, 256 GB SSD, SATA 2TB, SATA 4TB, NVidia GTX1080 8GB, LG 34" 4K Wide, AOC 24" 1080

Johnkl

Newbie Joined: May 07, 2017 13:48 Messages: 43 Offline

Aug 27, 2018 17:07

you are right :

I was writing and reading from the same slow SATA external USB3 drive.
By moving the data to one SSD and writing to another SSD speeded the whole process a lot...
Hovewer, I still dont understand why the machines need to process anything other than reading and writing if there is no change to the video.

One thing that I noticed: The SVRT analyze always select Dolby as the source for my audio. This is not my case, I'm using AAC, if I let that profile continue it takes L O N G time to render, but I have to change the profile to ACC and then let SVRT analyzer run again in order to select SVRT, the second time audio it set to AAC

JL_JL

Senior Contributor Location: Arizona, USA Joined: Oct 01, 2006 20:01 Messages: 6091 Offline

Aug 27, 2018 23:41

Quote One thing that I noticed: The SVRT analyze always select Dolby as the source for my audio. This is not my case, I'm using AAC, if I let that profile continue it takes L O N G time to render, but I have to change the profile to ACC and then let SVRT analyzer run again in order to select SVRT, the second time audio it set to AAC

Not sure on that, my experience is not that it always selects Dolby, what CL tech support indicated earlier was:

Quote Thanks very much for your help. Just for the record, I e-mailed Technical Support about this just to make sure that what I was trying to achieve is indeed possible, and have just received a reply:
"I understand you want to know how to use "Smart rendering" audio in PowerDirector 15. In regards to your concern, I would like to inform that SVRT only supports video profile only but not audio profile. We appreciate for the suggestion and have forwareded the needs to the related department." So it actually seems it's not possible in PD15, which is both surprising and disappointing. Oh, well - back to the drawing board of trying to find a piece of software that will "smart render" both video and audio...

My experience is similar to yours in that you have to fiddle a little to get the proper audio settings of the source and SVRT with manual audio to stick, a mistake can add significant time to "Produce" as you noted, but still substantially less than full re-encoding. The mistake I note with the longer times is often AAC source goes to Dolby or source of Dolby (stereo or 5.1) that goes to AAC.
I don't think it's really a pure copy as you infer, with the no change to the video statement. I think there is always change on the audio side, like a demux and mux. For instance, one can replace the audio with a separate track WAV file and the SVRT encode times will be the same as if the video audio was used.
I wonder if some of your performance shift was the fault of USB3 solely, was is possibly a USB2 external compatible HD in a USB3 port? That would do it, it's also very wise for SVRT with high bitrates as you have, 90+Mbps, that one isolates read and writes to separate drives, HD and/or SSD for best SVRT throughput.

Jeff