Why is my exported file size so big?

[siteminderUX]

Hi

I am no expert but do understand codecs, bitrates, formats etc. and usually have pretty good results when exporting footage. However, today I was editing a webinar which is basically screenshots and voice over. The source file (.mp4) is about 40MB but when exporting the file size jumps to 3+GB when using .h264 codec and matching the source file.

After many attempts and tests the minimum export size I could get while retaining the source quality was about 600MB which is more then x10 times the imported source.

Why does it happen? it's only a static 10/fps progressive footage.

Thanks

Mic

[R Neil Haugen]

Search the web for what I think are called "re-muxers".

Neil

[Phillip Harvey]

I believe there's one called Lossless Cut you can use that's what you (and many others in this thread) are looking for: trimming a clip without re-encoding.

[HeyTay]

I had some luck with my own webinar editing project today. I can't guarantee this will work for you, but maybe it is worth a try. Even though Premiere estimated that the size would be huge, it only exported a little bit bigger than the original video. The original video was 32mb and the new export was 36mb.

These are the only settings that I changed for export.

Under Export Settings

Format: H.264

Preset: Custom

Under Video Bit Rate Settings

Bitrate Encoding: VBR 2 Pass

Target Bitrate [Mbps]: 8

Max Bitrate [Mbps]: 50