vbv-maxtrate is automatically set to the maximum bit rate in the output profile.I was thinking maybe via a command line box in Advanced Options, using regular x264 syntax, and would append the GUI's encoder string. I use --vbv-maxrate and --vbv-bufsize a lot for streaming, occasionally --deblock and others for special cases.
And therein lies part of my problem with small home and wan streaming servers. Unconstrained (except by profile) peak bitrates typically cause stalls, stutters, and hiccups. Wifi is especially touchy about this. Capping vbv-maxrate is an effective prevention against this, at the expense of some high-motion detail. Also, on enterprise/school servers, media bandwidth control is essential if one is serving CQ/CRF and not converting everything to ABR/CBR, where even more source-level control is possible.vbv-maxtrate is automatically set to the maximum bit rate in the output profile.
level=4.1 --ref=1 --8x8dct=0 --weightp=1 --b-pyramid=none --subme=2 --mixed-refs=0 --trellis=0 --vbv-bufsize=30000 --vbv-maxrate=25000 --rc-lookahead=10 --deblock=-1,0
Wow - thanks for the tip!
"Size, Quality, Speed. Pick two."What I'd like to better understand is what I might be trading off when opting for smaller files sizes,
Okay, I've been an engineer (for nearly 40 years) where 360 of something are considered a HUGE sample size, but I can see how with video dividing those frames up in various ways (where I-frames can be far, far apart from each other) it's not. I was just figuring it might be enough to see some trends in size and appearance without investing a ton in time and space."Size, Quality, Speed. Pick two."
Note that presets will give different, sometimes contradictory results for each unique source footage.
More like aiming for a zone than a precise target, they are more consistent with programs longer than yours.
Most of my video clips (we're talking family videos of kids in sports and music and birthday party type stuff) are 1-2 minutes in length with some being perhaps up to 5 minutes in length. In the past I converted most of these (staying with the AVC flavor of h.264) using an average bitrate target of 6kbps (with peaks up to 15kbps) and and preset speed of very slow. Using preset speed, I was able to easily discern differences in size and visual quality.Ultrafast is the fastest encoding and biggest files at a constant quality, but take less time and are larger than Medium preset.
Placebo is the slowest encoding and smallest files at the same quality, perhaps in theory only. They could have called it the "Kitchen Sink" preset.
"noticing I could sometimes make a video more pleasing to watch"...I've been re-encoding since before the turn of the century, but I never really delved into it much. I played around with a couple filters here and there without full understanding what I was doing, but noticing I could sometimes make a video more pleasing to watch. Back then my primary purpose was to cut and join video into a versatile format without losing too much apparent detail.