say you have a video that is 640x480 and 25fps and you render it in 1280x720 and 30fps will that distort the video and lowers the quality? is it best to keep it as the original format?
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640*480 is native 4:3. 1280*720 is native 16:9. So going from the first to the second will stretch/distort the video.
If you want to upscale 4:3 then you would chose 960*720
Generally, any additional render will lower actual quality. You would have to increase the bitrate to compensate for the larger image but real quality is still lost.
640x480 -> 1280x720 stretches the video horizontally (4:3 -> 16:9), unless you add borders and/or force the display aspect ratio and set the sample aspect ratio correctly (assuming that your playback device can handle it properly).
25fps to 30fps speeds the runtime up and may desync video and audio unless you telecine or interpolate it properly.
So yes, it is often best to keep it at the original format unless you know exactly what you are doing.
Of course you can always try and see what you get