Hi, Jim, and thanks for chiming in so quickly. I've checked the logs for further information. Here's the log for a 10mbps transcode of the file: 03/01/2019 04:39:24 PM : Queue Started - Source File: C:\Users\Jay\AppData\Local\Temp\CONSUL 2.prproj - Output File: O:\SCROOGE 2018 Media\0118 CONSUL COMPLETE.mp4 - Preset Used: Match Source - High bitrate - Video: 3840x2160 (1.0), 29.97 fps, Progressive, Hardware Encoding, 02;11;44;19 - Audio: AAC, 320 kbps, 48 kHz, Stereo - Bitrate: VBR, 1 pass, Target 10.00 Mbps - Encoding Time: 03:14:40 03/01/2019 07:54:04 PM : File Successfully Encoded Here's the same info for the one encoded - same folder, same drive - at 40mbps: 03/02/2019 10:47:09 AM : Queue Started - Source File: C:\Users\Jay\AppData\Local\Temp\CONSUL 2_1.prproj - Output File: O:\SCROOGE 2018 Media\0118819 CONSUL COMPLETE.mp4 - Preset Used: YouTube 2160p 4K Ultra HD - Video: 3840x2160 (1.0), 29.97 fps, Progressive, Hardware Encoding, 02;11;44;19 - Audio: AAC, 320 kbps, 48 kHz, Stereo - Bitrate: VBR, 1 pass, Target 40.00 Mbps - Encoding Time: 05:50:03 03/02/2019 04:05:04 PM : File Successfully Encoded The drive in question is an external 3.1 USB (Gen-1) connected directly to my new Asus Prime Z390-A motherboard (rear connector). The primary system drive is a 500GB Samsung SSD. The original footage comes from my two camcorders, both Sony, one an FDR-AX100 and the other an HXR-NX80, and results from a multi-camera rendering of the opera THE CONSUL by Menotti. The original footage is around 55-58mbps. The quality of the later (and much larger) file is obviously better. Sharper, better color rendition. What doesn't make sense is the muxing process taking so long! In each case, the actual encoding of the video file was within 30 minutes of the actual length of the project (2h11m44s19f). So the 40mbps took 3 1/2 hours longer...and it was all muxing. I'll experiment with different drive usage. I can also write to a RAID connected via eSATA; I can try that with the next performance of the show that I'm editing now. If the log info strikes you as informative, do let me know. Again, thanks for your input which will inform further testing. Jay
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