Practical report: Upload via media manager (http://accesstoinsight.eu/doku.php?id=km:tipitaka:audiobooks&do=media&ns=km%3Atipitaka) would not work since amr is not supported.
If uploading a file via ftp or copy others as the supported file, they would be linked just as normal link (speak no player or display with extention icon).
Oh yes, that is because .amr is not supported inside standard HTML5 browser player. (Maybe this would change some day with the next standard.)
For .amr to be playable inside the browser one would need to have an own .amr player integrated somehow, as Adobe Flash, Java Applet or similar stuff. I have not found such an applet yet. And use of such techniques are not really common anymore and not well and universally supported. Most things nowadays are simply done with standard HTML5 and JavaScript. But HTML5 does not (yet) support .amr audio.
Another advantage maybe for .mp3.
Actually, there is plenty space available now. It is just not yet well arranged. Apart from the Greensta space there are 20 GB at test.accesstoinsight.eu, hosted at Gandi.net.
I have just sent the password for the upload interface at test.accesstoinsight.eu/files in an SMS. So Bhante could upload everything unconverted there if you want.
I could convert everything to .amr or .mp3 with less quality to accesstoinsight.eu.
Actually the sample Bhante gave of trying to convert to mp3 of lower quality was not the best one. The original file was mono and the converted (lower quality) file was stereo. So it had double the size as necessary for this quality, using two audio channels carrying the same signal.
Also, from what I've tried, keeping 22.05kHz sample rate (while still keeping the same compression rate) sounds better than lowering to 8000 Hz.
But still I think no more than 30% size reduction would be good for .mp3. Anything lower is not good.
.amr is better at this compression rate, being specialized for voice audio. I think the 30% reduced .mp3 sample I have here actually sounds very similar in quality to the .amr.
(File attached, 'mp3-noisereduced-16.mp3', compared with previous 'noisereduced.amr' file, I think the quality is nearly equal. There is also another file attached: 'mp3-noisereduced-24.mp3' is the same file size as the original mp3, but sounds clearer after reducing background-noise.)
My person will try to upload book 1 as jep and amr in the mediafolder corresponding to ថត សម្លេង ព្រះត្រៃបិដកភាសាខ្មែរ .
I think it would be good to upload anything not-yet-converted to test.accesstoinsight.eu. I could convert everything from there and also apply noise reduction, and then upload to accesstoinsight.eu.
Regarding this new domain: The webspace is hosted on Gandi.net, which I had registered some time ago, without any intention to do anything with it, and I have no other use for it now.
Actually there would be enough space to host them in original quality (maybe improved with noise reduction). It is only not yet well organized.
The domain is named test.accesstoinsight.eu, but it could also be named to everything else, like media.sangham.net. The actual name is "moralhighground.org", and test.accesstoinsight.eu is now pointing to that. (I just wanted to test out how this works for now.)
At the moment I only thought of it as an easy way to upload files in full quality to a place where I could download and convert them from.
I could also make the list of downloads there not password protected (and only the upload). It was just a quicker and simpler to do it this way now.
I actually I registered it some months ago with no intention to do anything specific with it, but with a thought that maybe if at some point, if something might be needed which is not available at Greensta, this could be useful for things around sangham.net as well.
It is a very different kind of server, running Node.js instead of PHP. So there are different tools available which could be helpful for some other things.
May the Sangha make use of it for whatever useful purpose.
Media manage (or better the syntax tools for display) seem to have troubles with khmer front, of cause it easer to name files only in latin scripst, as Moritz thought, there might be may other places where the cases might make troubles.
Good to know.