-
Exported MP4 same file size, no matter what I change…
Okay, so this is surreal. I’m exporting this project to an MP4, and at 1280 pixels wide, the final file was 1gig. So, I’m trying to get it down to around 500 megs, so I decreased the size to 900 pixels wide, and the final MP4 is one gig. I just changed the settings again to 720 pixels wide, and it’s …wait for it…*
Any ideas what settings I might have messed up to get this result? The video dimensions are the only change I made.
h.264, 720×404, 23.976fps, progressive VBR, 2 pass, ACC, 320kbps, 48 kHz
NOTE: all other projects have given me a predictable result. Thoughts?
* 1 gig
“Ohh, a lesson in not changing history from Mr. “I’m My Own Grandfather”! Let’s just steal the damn dish and get out of here! Screw history!”
-Professor Hubert Farnsworth -
6 Replies
-
Hi Shawn,
A resolution change will not affect on the final file size. It’s compressing less pixels at the same bit rate.
What you need to change is the video bit rate.
Also, you can most likely lower your audio bit rate down to 192k, it’s unlikely you will hear any difference, unless you are a sound engineer 🙂
Vince Becquiot
Indigo Live
San Francisco – Bay Area -
Actually, it turns out the file was corrupt anyway.
If I reduce a video from 1280 to 720, it’s definitely smaller. Not sure I understood your comment on that.
I’ll adjust my bit rates and audio settings as you indicate.
Thanks for the help Vince.
Shawn
“Ohh, a lesson in not changing history from Mr. “I’m My Own Grandfather”! Let’s just steal the damn dish and get out of here! Screw history!”
-Professor Hubert Farnsworth -
To append what I just said above – I realize now that I ASSUME it’s a smaller file, but I think I’m getting confused between Full Quicktime broadcast MOV, and an h.264 compressed file.
So, the file size os the same regardless the final video dimensions?
Shawn
“Ohh, a lesson in not changing history from Mr. “I’m My Own Grandfather”! Let’s just steal the damn dish and get out of here! Screw history!”
-Professor Hubert Farnsworth -
Hi Shawn,
So, to get into details, if a file is encoded at a video bit rate of say 2Mb/s (the average internet video), it will always come to 120 Mb per minute (or 15 MB) .It doesn’t matter what resolution it’s set to. Basically a lower resolution will usually result in better quality at low bit rates, since less pixels need to be compressed, but the final file size will always be the same.
If you are choosing H.264 from the Quicktime preset, you will not be able to choose a bit rate, only a quality setting. But if you choose H.264 Mainconcept from the main format settings, you will be able to input all that information.
Vince Becquiot
Indigo Live
San Francisco – Bay Area -
And just to add to the confusion:
If you used the QuickTime h.264 encoder, it’s possible that a lower resolution yielded to a smaller file size. Since it uses a “quality” setting, it likely lowered the bit rate in the background based on the resolution you gave it.
Vince Becquiot
Indigo Live
San Francisco – Bay Area -
Okay, that makes sense. I’m a graphic designer turned “video editor” (note the sarcastic quotes), so this level of detail is good to know. I’m not knowledgeable, but I am generally experienced enough to understand the concepts.
I appreciate the advice, again. Trying to improve…
Thanks Vince,
Shawn“Ohh, a lesson in not changing history from Mr. “I’m My Own Grandfather”! Let’s just steal the damn dish and get out of here! Screw history!”
-Professor Hubert Farnsworth
Reply to this Discussion! Login or Sign Up