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  1. I am using AviUtl. I have one video with a logo that is 1920x1080 and flv format. I have another without the logo in 640x480 DX50 format. After I make my edits, I am planning on outputting the project as H.264. I will make a mask to display the lower resolution video through where the logo is.

    What is the best way to resize the 640 video to 1080? I know it will not matter much. But I like to over-think quality. I could use the AviUtl resize and do it on the fly while re-coding. Or I could use some other program to re-code the 640 video to 1080. What will do the best quality resize?

    Crud. Looks there is no way to edit the misspelling in my title
    Last edited by ChasVideo; 5th Nov 2021 at 05:14.
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  2. NNEDI3_rpow2
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  3. I mentioned Avisynth in this related thread, in case you were puzzled by the laconic reply above, it also refers to Avisynth. From what I could read, it is the best available filter for upscaling, which is what you need here. Others may be more suited for downscaling, although I don't remember the specifics.
    In fact you could probably do the whole matching / resizing / overlaying with Avisynth, then use ffmpeg to encode the result directly from the AVS script. (The alternatives would be actually more complicated : either encoding each framerate converted and/or resized video with a lossless codec if you care about quality — which means huge intermediate files — then loading those files into AviUtl ; or creating “virtual” uncompressed files from the Avisynth script using AVFS, then loading those “virtual” files into AviUtl — this solution doesn't require extra storage space but is quite complicated to set up the first time, and can present reliability issues when the script becomes complex.)
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