Compressing Files

jarvis_own

Hey ! Everyone i want to compress videos and images which are in GBs. So how can i compress them on my device. I have don't upload my photos and then compress i want an offline on device (app) that can compress my img & vid.
Edit : don't want to lose of quality (quality is my priority)
In Advance : Thanking all !

Eumenia

jarvis_own

The default file manager has a function to compress files and folders to .zip, which is lossless

Johnnyloans

jarvis_own compress my img & vid.
Edit : don't want to lose of quality

jarvis_own Original SIZE :200MB
After compression SIZE :199.23
Almost negligible.

The only way to compress images or videos is to re-encode it. Re-encode always loses quality, usually negligible. It depends on the settings you use and how small you make it.

Even if you have it set to be the same bitrate/size and everything as the original, there's technically a quality loss.

Putting a jpg or video into a .zip, .rar file is just like putting a zip file inside of a zip file--it is already compressed. ( 200MB > 199MB)

Not sure if pixels have hardware encoding and apps to utilize it. However, hardware encoding always looks worse than software encoding which takes more time and CPU.

Eumenia bug in the compresion

No.

MineralWater

You can use apps like Rar from Rarlabs (just don't give it network access and you can use it for free without ads) to compress files.

However, compression always means a loss in quality.

I think you want an alternative to uploading the uncompressed pictures to a cloud and having compressed images in the gallery until you open them?

I am not sure if there is an offline solution to this. Maybe you can do this with own clouds like next cloud, but I don't know how and if that works.

0xC0DED0D0

MineralWater

jarvis_own

There's a difference between lossy and lossless compression. The former should arguably rather be referred to as "reduction" than "compression".

The thing is, though, that traditional compression algorithms — like ZIP, RAR, etc — are optimized and only intended for non-media files. Highly useful, and definitely lossless (lossy would defeat the purpose!), they basically pre-date any serious "multimedia" handling within computing.

So, for media files, formats like JPEG (images) or MP3 (audio) quickly became popular. But these are obviously lossy, as pointed out.

Lossless, true, compression is possible though! For audio, FLAC is most popular and well-known. The image equivalent you're looking for is AVIF.

As with audio, there are other lossless compression algorithms available too. In fact, both JPEG and PNG can do lossless as well, but AVIF is probably most popular.

Comparing lossless compression is a thankful task, as you only need to factor in speed and efficiency. No difference in quality — it's lossless! Were there any differences in output quality, the format isn't lossless by definition...

So, to the main question on how to go about compressing photos losslessly on Android: I'd recommend https://squoosh.app/ as it's usable within browser, or as a PWA.

Not a cloud service, as all processing is done client-side. But, keep in mind that it still does lossy compression as default. You need to manually select AVIF as output, and hit the "lossless" checkbox. Setting can be saved as preset for future use, though.

It takes quite some time to process photos on-device, and lossless compression yields "only" about a 25-30% reduction in size, compared to 50-75% for lossy. But Squoosh is probably your best option!

Vomitorius

There is a compress option in Files. Mark file and tap three dots in top right side

jarvis_own

Vomitorius

Eumenia
I have tried it. But it's kind of useless.
Original SIZE :200MB
After compression SIZE :199.23
Almost negligible.

AcclaimSublevel19

I'm using https://github.com/WirelessAlien/ZipXtract and it's pretty decent for compressing files on the go. It also supports archive formats with very good compression ratios and you won't lose quality. The caveat is that you have to extract the archive to be able to view the photos inside. It's best to back up your photos regularly and consider deleting older ones to free up space (especially videos).

Eumenia

jarvis_own I have tried it. But it's kind of useless.
Original SIZE :200MB
After compression SIZE :199.23
Almost negligible.

This looks like a bug in the compresion.

Maybe you can try to compress with ImageToolbox (It can compress all File type, not just Images)
https://github.com/T8RIN/ImageToolbox

AcclaimSublevel19

0xC0DED0D0 it should be mentioned that using AVIF may make the media compatible with less devices (similar to HEVC).

jarvis_own

0xC0DED0D0
Is it offline it says your data is safe (private). I am wondering how its a website and it cannot be run without internet. I want on device solution offline.

0xC0DED0D0

Sorry, missed that the original question was also about video compression.

Well, for that, you'd probably want to use FFmpeg CLI, within Termux, for FFV1, HuffYUV, or H.264/HEVC in lossless mode.

https://ffmpeg.org/ for full details. Bit cumbersome to hit the right parameters, but here's how to do FFV1 lossless:

ffmpeg -i input.mp4 -c:v ffv1 -level 3 -c:a copy output.mkv

Video processing is insanely heavy on a phone, though. Unless you have a high-spec Pixel, you'd probably want to hit Ctrl-C before it emits Cherenkov radiation or something. 😳

horde

https://github.com/JoshAtticus/Compressor

https://github.com/caydey/ffshare

jarvis_own

Eumenia
I have use imagetool box and one day (after a new update) i want to check the permissions after updating it. It has VIRUS and CAMERA PERMISSION , CONTACT PERMISSION and many more. I will not recommend you to use it. I can give the proof.

0xC0DED0D0

jarvis_own

Yes, it's completely offline (client-side), once loaded. All necessary code is handled inside the web browser, then run from there. Many websites, even some more advanced like this one, work this way.

Few realize that a web browser has essentially become its own "operating system" (or at least a program runtime environment). Lots of websites can be run as "Progressive Web Applications", or PWAs, nowadays.

This is also one of the reasons why Vanadium is such a crucial component of GrapheneOS.

Squoosh has full open source code at https://github.com/GoogleChromeLabs/squoosh, currently at 24.7k stars (more on this below).

jarvis_own

🤨

If installed through legitimate sources, Image Toolbox will certainly not have any viruses within it. Perfectly safe software, also open source: https://github.com/T8RIN/ImageToolbox

Currently at 11.6k stars, meaning "fans", on GitHub. Stars can be seen to matter in that it also roughly correlates with how many people are watching the code. If the developer went rogue, we'd certainly know about it by now...

Image Toolbox is a solid recommendation, and one I probably should have too, along with Squoosh. No worries.

jarvis_own

0xC0DED0D0 Thanks! For explaining

jarvis_own

0xC0DED0D0
Go and scan te apk file on virustotal you'll see and find everything.
First trogan , then shady permissions for an image compression app like contact etc. you'll get.
I had heared this : "Trust, but verify" now i'm started to think on it.
You know that its open source but what an issue in re-checking it.

0xC0DED0D0

jarvis_own "Trust but verify" is sound advice, I agree.

So, with that in mind, I checked out an Image Toolbox APK on VirusTotal, like you said.

And yes, I see what might be of concern here. There's a detection by VBA32 for "Trojan.Linux.Agent". This is the ONLY detection, out of 66 vendors, which also immediately mitigates any concern I might have. Here's why:

Virus/malware detection is extremely tricky and complicated. This is inherent of the "business" as threat actors are getting ever more clever in using countermeasures against finding the payload.
Hence why VirusTotal exists in the first place, it uses multiple tools in order to find any offending code.
When only one of the vendors on VirusTotal flags a scanned file as potentially malicious, this is most likely to be a false positive.
The detection of "Trojan.Linux.Agent" further indicates a false positive, as this is a generic label for any unlabelled malware.
VBA32 thus appears to be overly cautious in this case.
Here's what a true positive looks like on VirusTotal.

Even the true positive scan isn't flagged by all vendors, but most of them.

As to permissions usage by Image Toolbox, there are reasonable explanations as well:

"Camera" can be used by the built-in QR code reader, as well as the Tesseract-based OCR scanner.
Similarly, "Contacts" can be used by the built-in QR code generator to share contact info.

Image Toolbox won't request those permissions unless you use the respective features.

jarvis_own

0xC0DED0D0

0xC0DED0D0 Virus/malware detection is extremely tricky and complicated. This is inherent of the "business" as threat actors are getting ever more clever in using countermeasures against finding the payload.

I don't know that much can you explain in simple words.

0xC0DED0D0 As to permissions usage by Image Toolbox, there are reasonable explanations as well:

"Camera" can be used by the built-in QR code reader, as well as the Tesseract-based OCR scanner.
Similarly, "Contacts" can be used by the built-in QR code generator to share contact info.

Image Toolbox won't request those permissions unless you use the respective features.

Are you 100% sure about that. Imagetool box use it for compression.

My personal question:
1.How do you check virus in apks, files etc. ? I want to learn more.
2.How to understand all that virustotal give after scan?