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>And it was still grainy! Because the grain is not from video compression but because the camera sensor wasn't receiving enough light so it boosted the ISO to
by SilverRed 5y ago
>And it was still grainy!
Because the grain is not from video compression but because the camera sensor wasn't receiving enough light so it boosted the ISO to compensate which causes grain. Also the fact that phones have to live encode video which is very non optimal while movies are shot uncompressed and then a powerful CPU can spend as long as it needs for a perfect compression.
- deathanatos 5y agoThe CPU in a real machine makes a huge difference: the last video I shot on my phone went from 3.9M → 1.6M, ~59% compressed. (With no noticable quality loss, but the original isn't winning any Oscars…)
- SilverRed 5y agoAnd your phone is already pretty well off. Cheap dashcams spit out awful quality video with large file sizes since they don't have the benefit of expensive encoder chips.
- barrkel 5y agoOTOH with the unambitious encoding parameters they are very easy to cut with ffmpeg, or at least the MP4s produced by my helmet camera are. I mean, the cheaper the hardware, the fewer frames it'll be able to buffer, so I-frames should come pretty regularly. I wrote a very simple video editor: video playback, some scrubbing controls on the arrow keys to jump around, and space bar to mark / unmark segments to keep (capturing timestamps). Run ffmpeg to cut the bits out then move source video to a different directory, ready to be deleted. This cut down on my video volume 100x, while I still retained a few old commute videos, as a keepsake for that time in my life.
- GrayShade 5y agoAlso, noisier video will probably compress worse.