I imported a video that is 3.06 GB shot in 1920 x 1080. All I did was make a few adjustments with color and lighting. When I go to export I choose Match Source, format H.264, make sure frame rate, size etc is the same but the estimated file size is only 621 MB. Even when I increase the bitrate the largest my file size gets is 1618 MB. What am I doing wrong? Why isn't my exported video the same as the original (3.06 GB) or higher?
It might be irrelevent.
Is the file that you are exporting for delivery to YouTube or social media (or anywhere else a finished movie file is likely to be used where the intended audience is viewing it)? Then, yes, it is irrelevant as the exported file is expected to be smaller than high bitrate source footage.
Is the file that you are exporting to be used as source? Then, no, it is not irrelevant as the exported file needs to be high bitrate to hold up well to further editing.
With H264, it's common for source footage (like a camera orignal file, for example) to be 50, 100, or 200 mbits per second while a delivery file might be 5, 10, or 40 mbits per second. As such, the delivery file will be smaller.
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