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Support the BPG image format #36
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From @jospoortvliet on June 23, 2015 11:50 aw this is really cool ;-) |
Except that almost nobody has collections in that format :D . I think this would be most useful as a format for thumbnails, but it won't happen before ownCloud uses PHP7 as the minimum version of PHP... |
Let's see what the GD team has to say about it :) |
From @vi on June 23, 2015 14:40 Can it use the JavaScript version as a fallback when libbpg is not available? |
I suppose you're talking about using it for thumbnails in core, but unfortunately, it wouldn't work. I could create an app which would only work with that format, but it would only work with Gallery and would mean having 2 copies of each thumbnail, one in PNG and one in BPG. So currently, the only thing we can do is show BPG images and let users convert their collections using their favourite tools. |
From @vi on June 23, 2015 15:30 I don't want ownCloud to convert pictures, I just want to save storage and traffic by using BPGs which I provide.
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Since there is not a single browser supporting BGP, the app would need to always decode files. |
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From @vi on June 23, 2015 16:28 Why no JavaScript source code for the decoder? It's probably this: https://github.com/mirrorer/libbpg/blob/master/post.js . It probably requires some Emscripten and friends to complile... Here is example of using |
Yes, that's the one. There is no need to compile it as it provides a |
Preliminary analysisI did some testing and it's a not easy to work with. We would need our own decoders since the methods available are too rigid and since we would need to add our own. PNGs - 16 pictures - 36.1MB - GD resizing116 requests - 3.9MB - 5.5sBPG - 18 pictures - 1.5MB - Browser resizing116 requests - 4.5MB - 8.5sBPG - 18 pictures - 1.5MB - Hermite algo resizing116 requests - 4.5MB - 10sI did not enable asset pipe-lining in the tests, so you could probably shave off 4s to the loading time, which means that you get from 1.5s with PNGs to 6s with BPG with a resizing algorithm and that's with only 18 pictures... |
Things to test:
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Now that BPG has evolved into a standard we should reconsider this. |
BPG is different than HEIF, and it is more complex. There is also AVIF, which is a simpler (subset?) version of HEIF, probably less problematic with patents. BPG, HEIF, and AVIF have little or zero support in browsers. IMHO, broad support is more likely to come to AVIF in the mid-term, but that is not the current situation. I don't think BPG has future (e.g.: probably less than FLIF). |
Different container, same codec
As far as I understand, bpg container is simpler than HEIF container (which is basically mp4). Features seem to match.
AVIF is based on AV1 video codec. I don't think it is subset of HEIF (based on HEVC codec). The main common part is usage of MP4-like container.
Probably.
Maybe it is correct, given "future" and "large vendor support" is very correlated. I'm thinking about a tool that losslessly converts bpg files to heic files... |
Not really. HEIF can contain images and image sequences coded in different formats.
Sorry, I wrote the opposite of what I wanted to say, HEIF can be more complex to implement.
I think AVIF files are valid HEIF files that use the AV1 codec. Therefore, the format is based on both HEIF and AV1. |
Now I understand what is difference between HEIC and HEIF:
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From @oparoz on June 22, 2015 18:22
Introduction
BPG (Better Portable Graphics) is a new image format. Its purpose is to replace the JPEG image format when quality or file size is an issue. Its main advantages are:
Source: http://bellard.org/bpg/
Converters
Plan
After a preliminary analysis, I concluded that it would not be too difficult to add support to ownCloud via the Gallery app, but the use cases are quite limited at the moment, since mobile browsers would not be able to show the images.
image/bpg
to the list of core media types Adding BPG media type owncloud/core#17206Avenues to explore
Advantages
Caveats
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Copied from original issue: owncloud/gallery#185
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