Video file size getting larger after cutting?

[MustafaIslam]

I cut a 2mb video to make it shorter and the cut video is 10mb! How did it get bigger? What kind of stupid encoder does Samsung use? And why does it take so long to cut it too?

[Akhil2307]

Why file size is increasing after trimming on samsung studio?

My 55mb with 28mins video 480p resolution 

Trimmed to 14mins with 480p resolution, output file size is 445mb

Even with HEVC encoding also output file ended up with 400mb

Why the video size getting increasing? 

PLEASE RESOLVE THE ISSUE ASAP

 

[Shindaneko]

This is still an on-going issue.  

I regularly edit down videos to save file space. Even with deleting shadow data (full back-ups of original video to allow reverting) or saving as a new copy, the new file with the same resolution, encoding, extension, and fps when cut from 38.5 min to 22 min (-17min) went from 2.45 Gb to 3.68 Gb. That's actually the opposite of what I was trying to accomplish and might as well have left the file intact.

Yet, as a test, I cut the second file from 22min to 11 min (-11min) and the file size resumed from 3.68 Gb to 1.54 Gb, which is what I would have expected from the initial cut. 

As another test, I deleted the two edits and and saved a new on. This time, I simply cut 2 seconds of the original going from 38 min 30 sec to 38 min 28 sec. Everything else was exactly the same, it took 9 min to process, and the files sizes went from 2.45 Gb to 6.33 Gb. The video TRIPPLED in size! Why? They were practically the same file, less 2 secs. This seems to happen with all original video files when edited. Anyone trying to trim files to save space is then doing more harm than good and likely don’t even realize it.

That is horribly broken and eating up precious storage space.

This is unacceptable and really needs a clear explanation of what is happening and needs to be resolved and fixed asap.

[hArDsTyLe2259]

Iv been having this issue too, 30 min video cropped down to 10 mins and size increased by a full gig despite being the same res and no added effects/changes.

[Members_7aLROHT]

I have the same issue as everyone in this thread, and I have a guess why this is happening. 

When you edit a video or an image, the original file is still saved in the file's metadata or somewhere else to allow the user to revert changes.

However, what I don't understand is why when you "Save as copy", the file still weighs more than the original, even though you still have the original file on your device. If my guesses are correct, then I don't understand WHY there is no "delete original file data" button so the file doesn't weigh like 2x the size??? And WHY can't Samsung employees just say that, instead of being utterly useless.

[Noah20]

I cut 5 seconds in a video that was originally 1 minutes and 42 seconds long and it went from 13MB to 93MB. REALLY? That stuff makes me mad all the time. 

[chart2006]

This is entertaining because here we are over 4 years later and people are still having the same issue. To answer the question, it's because the embedded encoder is garbage plain and simple. The MP4 container is just in container but the encoder which is what's used to compress the file can vary in its compression algorithm. In other words everyone uses a different compression algorithm and the output file size varies based off what is used. It's why you'll be able to download an HD video from Facebook and it be 2MB but the moment you cut it or edit it in some fashion all of a sudden it goes from 2 to 200 MB. Facebook has developed their own compression algorithm called Zstandard (ZSTD) which they developed and is pretty darn efficient. While it's technically open-source I'm not aware of any app that uses it. 

As for a workaround the only thing I found is to use a standalone compression application. It won't get you to being as small of a file that you would normally find when downloading from Facebook or even some other websites but there's quite a few out there that have decent encoders or at least significantly better encoders than Samsung's built-in one.