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opening a large pdf files on web
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Closed 6 years ago.
I am hosting around 18Mb pdf file to s3 bucket and trying to get it, but it takes a long time on a bit slow network, I also tried to covert the file to HTML and then render it but it becomes of around 48MB because of which the phone starts hanging. I have also moved the s3 to Singapore location to reduce latency and have also tried to pipe it through the server, Now I am only left with a option to disintegrate the PDF into images for every page and load them when requested, Is there anything that I am missing to make the load time of pdf bearable?
You have the following options as you are facing limitations on end-users devices:
Split large PDF files into several parts and allow users to download these parts separately.
Linearize PDF files, this will affect how files are loaded but will not decrease the size so you may face issue with crashes on end-user devices too.
Optimize file size of PDF files by re-compressing images inside.
Render low resolution JPEG images of PDF pages (with Ghostscript or ImageMagick) but please do not use JPEG as main format as JPEG compression is not designed for text compression (but for human faces).
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I am writing my own Opus Ogg writer following these specifications: RFC7845 and RFC3533.
Currently, I am facing an issue that I believe is related to how I am setting the lacing values (segment table).
My current setup is to basically read (using an existing Ogg reader) an Ogg file with a single Opus track and put that Opus track in another Ogg file that I create using my own Ogg writer.
So I have a function that takes the Opus content of each page from the original Ogg file and put it in pages in my new Ogg file.
I am being able to create the file successfully, but when I try playing it on VLC, it shows the correct timestamp but it does not play any sound.
I noticed that the issue is being caused by the way my segment table (or lacing values) is set.
I am currently creating it by filling each segment with as much data as possible (i.e 255 bytes), and letting only the last segment have a size < 255. This seems to be the way that other implementations are doing it (see Rust implementation, C implementation).
However, when I inspect the lacing values for a page containing that Opus content in the original Ogg file, it is not filled with 255s. It's another combination of segment sizes that still sums up to the same page size, but that uses more segments (since it's not taking up the max segment size). When I try using the exact segments combination in the original file, the file plays on VLC successfully.
So that makes me conclude that the approach I am taking with creating as many 255-sized segments is incorrect. Does anyone have any idea how to properly set the lacing values?
I am trying to write a script in python or nodejs which can download a file, image or video at constant speed, lets say average download rate of my connection is 10 mbs/s but I want to dedicate 3 mbs/s speed to that script and it must download the media at that constant speed.
I'm creating a Raspberry Pi Zero W security camera and am attempting to integrate motion detection using Node.js. Images are being taken with Pi camera module at 8 Megapixels (3280x2464 pixels, roughly 5MB per image).
On a Pi Zero, resources are limited, so loading an entire image from file to Node.js may limit how fast I can capture then evaluate large photographs. Surprisingly, I capture about two 8MB images per second in a background time lapse process and hope to continue to capture the largest sized images roughly once per second at least. One resource that could help with this is extracting the embedded thumbnail from the large image (thumbnail size customizable in raspistill application).
Do you have thoughts on how I could quickly extract the thumbnail from a large image without loading the full image in Node.js? So far I've found a partial answer here. I'm guessing I would manage this through a buffer somehow?
Starting from the assumption that I have deleted all unnecessary files, i have my app that contains a folder with jpg images (1024*700 resolution minimum permitted) where the size is 400 MB. When generate my ipa size is 120 MB. I have tried to convert those images in PNG and next generate ipa but size is more than 120 MB (140 MB), but quality it's a bit worse.
Which best practices recommended to reduce the size of the application?
P.s. Those files are showed as gallery.
On tool we used in our game, Draw a Stickman: EPIC, is smusher.
To install (you have to have ruby or XCode command line tools):
sudo gem install smusher
It might print some errors installing that you can ignore.
To use it:
smusher mypng.png
smusher myjpg.jpg
The tool will send the picture off to yahoo's web service smush.it, and in a non-lossy way compress the image.
Generally you can save maybe 20% file size with no loss in quality.
There are definitely other techniques we used like using indexed PNGs, but you are already using JPGs, which are smaller.
Is that possible to download only several bytes using torrents? E.g. download all ID2 headers from all mp3 files in torrent.
NO
but you can write script which downloads only pieces which contain part of file which contain desired data and process that piece(partOFfile). but its very complex process. size of pieces relies on size of torrent so you can end up downloading whole song if torrent is big. it depends on your application.
No , there is no such facility in existing torrent clients , you should build your Torrent client to do that .