Vapoursynth Auto Detect Width based on Input - Printable Version +- Selur's Little Message Board (https://forum.selur.net) +-- Forum: Talk, Talk, Talk (https://forum.selur.net/forum-5.html) +--- Forum: A/V Talk (https://forum.selur.net/forum-6.html) +--- Thread: Vapoursynth Auto Detect Width based on Input (/thread-3025.html)

Vapoursynth Auto Detect Width based on Input - TheLastApostle - 08.01.2023 Hi, I have a library with hundreds of clips each with different aspect ratios ( 16:9 and 21:9 ) How could I in the param underneath tell VS to auto add/decide the height based on the inputs aspect ratio? clip = vs.core.resize.Bicubic(clip, width = 1280, height = 720, format=vs.RGBS, matrix_in_s="709") Thank you! RE: Vapoursynth Auto Detect Width based on Input - Selur - 08.01.2023 In Hybrid, you could simply tell Hybrid to: autocrop resize to target width 1280 add letterbox to 1280x720 That said, since this is not Hybrid related, in Vapoursynth in general it's tricky since not all source filters set that info and neither VideoNode  (http://www.vapoursynth.com/doc/pythonreference.html#VideoNode) or VideoFrame (http://www.vapoursynth.com/doc/pythonreference.html#VideoFrame) does hold par information. Assuming you are using lsmas.LibavSMASHSource or lsmas.LWLibavSource you are in luck. lsmas it sets "_SARNum" and "_SARDen" as frame properties. So you could write some python code to calculate the new height value. Untested, but I think it should work targetWidth = 1280 sarNum = float(int(clip.get_frame(0).props["_SARNum"])) sarDen = float(int(clip.get_frame(0).props["_SARNum"])) mult = targetWidth/(clip.width*sarNum/sarDen)) # newWidth =  oldWidth*SARNum/SARDen*mult newHeight = int(height * mult + 0.5); # note that this might be mod1, not all filter support this clip = vs.core.resize.Bicubic(clip, width = targetWidth, height = newHeight, format=vs.RGBS, matrix_in_s="709") If you later want to convert back to anything but YUV 4:4:4 you need to adjust the height for any height requirement due to the sub sampling. Cu Selur Ps.: this will only work if your source is properly signaling the PAR (16:9 and 21:9 are DARs)