Bobbing such a source to 50 frames per second is appropriate if you want progressive video. I tried viewing one of the 50fps output files in my editing software, where I can see it frame-by-frame, and I can see 50 individual unique/different frames per second? That indicates the source was true interlaced video (50 fields per second), not film (24 frames per second, normally sped up to 25 frames per second for PAL broadcast/DVD). Likewise please advise if there are any mistakes in my understanding. I would be grateful if someone could confirm if I should be setting the output to 50fps, or if the quality is better leaving it at 25fps. I've seen people say setting it to 50fps will only result in duplicated fields, but I've tried it myself and I do seem to get 50 unique fields (I can verify this with editing software), so I'm not sure if there's another reason (relating to the quality) that this should not be done? If I understance correctly, PAL DVD recordings at "25i fps" should deinterlace to "50p fps", in the same way that "1080i 25fps" would deinterlace to "1080p 50fps". Should I be setting the output format to 50fps, or leave it as 25fps (same as source)? I understand the basics of deinterlaced content but have a question that I've never found a definitive answer to. For PAL content this results in a 25fps MP4. I've been converting DVDs to MP4s using handbrake for many years and have always used Bob deinterlacing and left the Framerate as "Same as source / Variable".
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