VEGAS 17 - 400mbps 4K HEVC stuttering bad on timeline

j-v wrote on 11/22/2019, 1:15 PM

1. Install the latest Studio drivers for your GPU and enable it in Options/Preferences /Video
2. If you don't use Dynamic RAM preview, lower that option on the same place to 0 or the default 200
3. Select in Options Preferences/ File I/O these options

4. If this does not help, use also proxies for those files.

Musicvid wrote on 11/22/2019, 2:14 PM

VEGAS 17 - 400mbps 4K HEVC stuttering bad on timeline

Yes, I would expect that with any combination of equipment, settings, and drivers, unless you have a nitrogen cooling tower sticking through your roof. What would you use 400Mbps for? "Because I can " is not an answer.

Proxies.

karma17 wrote on 11/22/2019, 2:33 PM

FWIW, you might try disabling Thumbsnails in Options > Preferences > Video. And turn OFF, Thumbnails to show on Video Events.

LMK if that helps, you can donate $5 to the charity of your choice.

fr0sty wrote on 11/22/2019, 3:16 PM

Without hardware decoding, you aren't going to smoothly play back that file on your system. Try hardware decoding, which can be enabled on the file i/o tab of preferences.

fifonik wrote on 11/22/2019, 7:58 PM

1/2 off: 400mbps (milli-bits-per-second) does not make any sense. 400Mbps (mega-bits-per-second) does.

Musicvid wrote on 11/22/2019, 8:27 PM

m vs. M?

I don't recall anyone making that distinction since the days of 5-1/2" floppies and bell bottoms.

OTOH, there are still 8 b in a B, and Mb and Mib are conflated.

TheRhino wrote on 11/22/2019, 11:25 PM

HEVC is designed to save space so it's not a good codec for editing... Therefore a lot of folks will transcode it to a ProRes or DNxHR intermediate of equal or better quality.

That said, I have edited 10bit 400Mbps 4K HEVC on my 9900K workstation. Although the projects have only required basic cuts & color work I did not experience stuttering on the timeline... I have both the onboard iGPU & liquid-cooled VEGA 64 enabled on my 4.9ghz 9900K system because the 9900K's onboard QSV appears to help with HEVC. To do this I have to have a 3rd monitor plugged into the onboard iGPU or it is not recognized by Windows or Vegas… I then have (4) 2TB M.2 placed into two separate RAID0 configurations so I have 8TB @ 3000+MB/s available for my source video files. The target drive is a 400Mb/s SATA RAID0. This allows me to work with very high quality 4K intermediates and 1080p uncompressed which are the bulk of my current paid work.

In addition to others' suggestions, on an older Xeon I used to change the project settings to 1080 to edit 4K. Then I would change it back to 4K for the final render... This allowed me to preview the timeline without stuttering, but even on that system I had the source video on fast RAID0 arrays...