![]() 1) To use constant quality mode, you MUST use a value of "0" when specifying the video bitrate (-b:v 0).There are two ways of using CRF - 1) "Constant Quality" mode, 2) "Constrained Quality" mode. Must be from 4-63 in VP8, or 0-63 in VP9. I believe the -qmax option prevents the quality from dropping below a certain level for any given frame, so the overall video quality will be more consistent (it prevents you from getting certain frames in your video which are of absolutely dreadful quality where everything is blocky as fuck, basically). All I know is that lower numbers = better quality. Don't worry if you don't know what a quantization parameter is, because neither do I. -qmin and -qmax: Tells ffmpeg what "quantization parameter" to use when assigning quality.Use -speed 0 for maximum quality and lowest filesizes. Faster speeds come at the expense of lower quality and larger filesizes. -speed: Controls the speed at which the video is encoded.For example, -t 00:00:10 cuts out the first ten seconds of the video for conversion, and -ss 00:00:10 -t 00:00:10 would skip the first ten seconds and cut out the next ten for conversion. use -t in tandem to set the file duration. ![]() Takes time in seconds as a parameter or HH:MM:SS syntax. You should probably not touch this unless you know what you're doing. Sometimes setting to 1 will give you a smaller filesize.
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