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JohnAStebbins · 23rd January 2014, 16:54

Hi,

Bob in HandBrake is indeed yadif mode 1.

Regarding framerates, the default framerate mode in HandBrake is "variable frame rate" (VFR). The duration of each frame can vary. This is especially useful with the Bob Decomb filter. This filter will output some frames at 25fps (frames where no combing is detected) and some frames at 50fps (combed frames). In this scenario, if you do not use VFR and instead set your framerate to 50fps CFR, the 25fps sequences will have their framerate increased to 50fps by duplicating frames. This results in encoding of duplicate frames that wastes a little space. The amount of wasted space is pretty minimal since duplicate frames compress really well.

Basically, what I'm saying is framerate doesn't matter if you use HandBrake's default VFR setting. It automatically "does the right thing" to preserve fluid motion. The important factor is your choice of deinterlace filter. The Bob variation of decomb or deinterlace preserves motion best.

The only reason not to use VFR would be for device compatibility. Some broken devices don't parse h.264 VFR information properly.

23rd January 2014, 16:54	#13 \| Link
JohnAStebbins Registered User Join Date: Oct 2008 Posts: 114	Hi, Bob in HandBrake is indeed yadif mode 1. Regarding framerates, the default framerate mode in HandBrake is "variable frame rate" (VFR). The duration of each frame can vary. This is especially useful with the Bob Decomb filter. This filter will output some frames at 25fps (frames where no combing is detected) and some frames at 50fps (combed frames). In this scenario, if you do not use VFR and instead set your framerate to 50fps CFR, the 25fps sequences will have their framerate increased to 50fps by duplicating frames. This results in encoding of duplicate frames that wastes a little space. The amount of wasted space is pretty minimal since duplicate frames compress really well. Basically, what I'm saying is framerate doesn't matter if you use HandBrake's default VFR setting. It automatically "does the right thing" to preserve fluid motion. The important factor is your choice of deinterlace filter. The Bob variation of decomb or deinterlace preserves motion best. The only reason not to use VFR would be for device compatibility. Some broken devices don't parse h.264 VFR information properly.