I had a similar complaint for those using HappyOtterScripts for rendering. I added an option to change processing priority in which the user could select below normal or low (as well as above normal or high) to permit other things to be done during renders. I suspect that you can easily do this manually by changing these settings using Windows Task Manager. I might be mistaken, but I think the freeware SEMW extensions also support priority changes during rendering. Perhaps someone using these extensions could comment.
I often open a second instance of Vegas and edit a different project. Over many years there has never been a problem. Not tried rendering two project simultaneously. CPU & GPU rarely get above 50% so may be worth a test.
OK just tried to render 2 projects. As anticipated appallingly slow but no crash..
Even on my 'low end' PC it is OK. CPU utilisation still high (more that 90%) in Task Manager, but PC is absolutely usable for typical tasks (browsing, email, watching video, web programming etc). Usually I do not do video editing in other Vegas instance as I noticed then when I adjusting some plugins (mercalli v4 for example) that are also used in the rendering project the render might stuck. Simple trimming video editing works with no issues.
I'd recommend to update chipset driver if someone have the issue (I'd use Intel/AMD ones, not from Microsoft).
Rendering with VP the CPU usage is around 50% with low usage on the nVvidia and intel GPU's. Rendering a similar project with Edius 8v5 results in CPU usage 98% with low usage of the GPU's. When Mercalli is in use the CPU drops to about 50%.
The video finished and came out ok, render time was about 1:1. But for some reason the file size is much larger than with other programs. Like almost 10x larger. Am i missing something here? All the presets in Vegas seemed quite large. Wouldn't allow me to match project settings..
~~~~~~~~~~~~~~~~~~~~~~~Original Format : MPEG-4 Format profile : Base Media Codec ID : isom (isom/iso2/avc1/mp41) File size : 9.64 GiB Duration : 11 h 40 min Overall bit rate mode : Variable Overall bit rate : 1 970 kb/s Writing application : Lavf58.20.100
Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : Baseline@L4 Format settings : 1 Ref Frames Format settings, CABAC : No Format settings, RefFrames : 1 frame Codec ID : avc1 Codec ID/Info : Advanced Video Coding Duration : 11 h 40 min Source duration : 542 ms Bit rate mode : Variable Bit rate : 1 709 kb/s Maximum bit rate : 2 000 kb/s Width : 1 920 pixels Height : 1 080 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 30.000 FPS Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Scan type : Progressive Bits/(Pixel*Frame) : 0.027 Stream size : 8.36 GiB (87%) Source stream size : 8.36 GiB (87%) Color range : Limited Transfer characteristics : BT.709 Matrix coefficients : BT.709 mdhd_Duration : 42012284 Codec configuration box : avcC
Audio ID : 2 Format : AAC LC Format/Info : Advanced Audio Codec Low Complexity Codec ID : mp4a-40-2 Duration : 11 h 40 min Bit rate mode : Variable Bit rate : 253 kb/s Maximum bit rate : 256 kb/s Channel(s) : 2 channels Channel layout : L R Sampling rate : 48.0 kHz Frame rate : 46.875 FPS (1024 SPF) Compression mode : Lossy Stream size : 1.24 GiB (13%) Default : Yes Alternate group : 1
~~~~~~~~~~~~~~~~~~~~~~~~~Vegas Render Format : MPEG-4 Format profile : Base Media / Version 2 Codec ID : mp42 (isom/mp42) File size : 97.8 GiB Duration : 11 h 40 min Overall bit rate mode : Variable Overall bit rate : 20.0 Mb/s Encoded date : UTC 2019-06-17 04:57:55 Tagged date : UTC 2019-06-17 04:57:55
Video ID : 1 Format : HEVC Format/Info : High Efficiency Video Coding Format profile : Main@L4.1@High Codec ID : hvc1 Codec ID/Info : High Efficiency Video Coding Duration : 11 h 40 min Bit rate : 19.8 Mb/s Width : 1 920 pixels Height : 1 080 pixels Display aspect ratio : 16:9 Frame rate mode : Constant Frame rate : 59.940 (60000/1001) FPS Color space : YUV Chroma subsampling : 4:2:0 Bit depth : 8 bits Bits/(Pixel*Frame) : 0.159 Stream size : 96.8 GiB (99%) Language : English Encoded date : UTC 2019-06-17 04:57:56 Tagged date : UTC 2019-06-17 04:57:56 Codec configuration box : hvcC
Audio ID : 2 Format : AAC LC Format/Info : Advanced Audio Codec Low Complexity Format profile : AAC@L2 Codec ID : mp4a-40-2 Duration : 11 h 40 min Bit rate mode : Variable Bit rate : 192 kb/s Maximum bit rate : 525 kb/s Channel(s) : 2 channels Channel layout : L R Sampling rate : 48.0 kHz Frame rate : 46.875 FPS (1024 SPF) Compression mode : Lossy Stream size : 949 MiB (1%) Language : English Encoded date : UTC 2019-06-17 04:57:56 Tagged date : UTC 2019-06-17 04:57:56
You used wrong framerate (in project settings or in render) and specified too high bitrate.
It's not VP to blame.
> All the presets in Vegas seemed quite large.
You can modify render templates (key in lower bitrate if you like, however I would not do this as usually wou will get poor quality video, I'd better downscale it to 720p) and save it under different name.