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Editing mp4 makes file size much bigger

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Paul CampbellEditing mp4 makes file size much bigger
by on Jul 21, 2016 at 5:38:04 pm

I was emailed a little :15 video clip to which I wanted to add a :06 jingle. No biggy on the edit, just cropped some of the audio and squeezed the jingle in at the end. When I went to output it, the file size jumped from 2MB to 18MB. It was an mp4 file, resolution was something weird like 700x404 or something (don't quote me on that, but it was something like that).

As far as the output settings, I used H.264 as the preset (choosing mp4 from the dropdown list forced the resolution to a smaller size for some reason, so I didn't use it) and chose the "Match source" for the other options. The only way I could get the output file size down to a reasonable 5MB was to choose a medium bitrate. It didn't appear to affect the video quality, so I went with it. However, this isn't the answer. Was the original mp4 that was sent possibly compressed using an expensive hardware compressor/encoder, maybe? I don't understand why adding a simple :06 jingle could make the file size jump so high.

Facepalm.


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Dave LaRondeRe: Editing mp4 makes file size much bigger
by on Jul 21, 2016 at 5:50:59 pm

I bet it's the weird dimensions of the footage.

MP4/H.264 encodes to a finite set of STANDARD dimensions. Your stuff ain't standard. You may have to export a high-quality file and use some other compression software.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA


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Paul CampbellRe: Editing mp4 makes file size much bigger
by on Jul 21, 2016 at 6:09:36 pm

I do have Compressor to use, so that option exists. Gracias.


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Tero AhlforsRe: Editing mp4 makes file size much bigger
by on Jul 21, 2016 at 5:51:27 pm

You exported it with a higher bitrate than the original file.


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Paul CampbellRe: Editing mp4 makes file size much bigger
by on Jul 21, 2016 at 6:11:10 pm

I was searching for details of the original file to figure that out, but couldn't find that info anywhere. Doesn't Premiere allow me to view the original encoding bitrate?


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Tero AhlforsRe: Editing mp4 makes file size much bigger
by on Jul 21, 2016 at 6:19:50 pm

You know the size and duration so you could use simple arithmetics to figure that out.


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Paul CampbellRe: Editing mp4 makes file size much bigger
by on Jul 21, 2016 at 6:31:25 pm

Oh sure, make me earn this why don't you? :-)


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Tero AhlforsRe: Editing mp4 makes file size much bigger
by on Jul 21, 2016 at 6:35:16 pm

It's a basic skill that you'll probably use a bunch so yeah. Earn it.


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