Vitrinekast at 17:19, 8 November 2023

2023-11-08T17:19:20Z

← Older revision		Revision as of 19:19, 8 November 2023
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			''This page looked so much better in markdown...''

	Example of a media fragment URI URL: http://www.example.org/video.ogv?t=60,100#t=20		Example of a media fragment URI URL: http://www.example.org/video.ogv?t=60,100#t=20

Vitrinekast at 17:19, 8 November 2023

2023-11-08T17:19:03Z

← Older revision		Revision as of 19:19, 8 November 2023
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	==next steps==		==next steps==
	~~- [ ]~~ Furher understand the Media fragment URI and what the current state of the spec is		* Furher understand the Media fragment URI and what the current state of the spec is
	~~- [ ]~~ Read about [OggKate - XiphWiki](https://wiki.xiph.org/OggKate) an open source codec which could be used for Karaoke, but essentially allows for attaching time based metadata (see example below)		* Read about [OggKate - XiphWiki](https://wiki.xiph.org/OggKate) an open source codec which could be used for Karaoke, but essentially allows for attaching time based metadata (see example below)
	<pre>		<pre>
	event {		event {

Vitrinekast at 17:18, 8 November 2023

2023-11-08T17:18:52Z

← Older revision		Revision as of 19:18, 8 November 2023
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	~~###~~ next steps		==next steps==
	- [ ] Furher understand the Media fragment URI and what the current state of the spec is		- [ ] Furher understand the Media fragment URI and what the current state of the spec is
	- [ ] Read about [OggKate - XiphWiki](https://wiki.xiph.org/OggKate) an open source codec which could be used for Karaoke, but essentially allows for attaching time based metadata (see example below)		- [ ] Read about [OggKate - XiphWiki](https://wiki.xiph.org/OggKate) an open source codec which could be used for Karaoke, but essentially allows for attaching time based metadata (see example below)

Vitrinekast: Created page with "Example of a media fragment URI URL: http://www.example.org/video.ogv?t=60,100#t=20 Text below is from the [https://www.w3.org/TR/media-frags/#media-fragment-syntax) Media Fragments URI 1.0 (basic)] The names and values can be arbitrary Unicode strings, encoded in [https://www.w3.org/TR/media-frags/#utf-8 UTF-8] and percent-encoded as per [https://www.w3.org/TR/media-frags/#rfc3986 RFC 3986]. Here are some examples of URIs with name-value pairs in the fragment compo..."

2023-11-08T17:18:40Z

Created page with "Example of a media fragment URI URL: http://www.example.org/video.ogv?t=60,100#t=20 Text below is from the [https://www.w3.org/TR/media-frags/#media-fragment-syntax) Media Fragments URI 1.0 (basic)] The names and values can be arbitrary Unicode strings, encoded in [https://www.w3.org/TR/media-frags/#utf-8 UTF-8] and percent-encoded as per [https://www.w3.org/TR/media-frags/#rfc3986 RFC 3986]. Here are some examples of URIs with name-value pairs in the fragment compo..."

New page

Example of a media fragment URI URL: http://www.example.org/video.ogv?t=60,100#t=20

Text below is from the [https://www.w3.org/TR/media-frags/#media-fragment-syntax) Media Fragments URI 1.0 (basic)]

The names and values can be arbitrary Unicode strings, encoded in [https://www.w3.org/TR/media-frags/#utf-8 UTF-8] and percent-encoded as per [https://www.w3.org/TR/media-frags/#rfc3986 RFC 3986]. Here are some examples of URIs with name-value pairs in the fragment component, to demonstrate the general structure:
<pre>
* http://www.example.com/example.ogv#t=10,20
* http://www.example.com/example.ogv#track=audio&t=10,20
* http://www.example.com/example.ogv#id=Cap%C3%ADtulo%202
</pre>
Media fragment URI can be used on video, images, and audio(?) → altough mentioned in the spec as video only(?) but what is a video anyway...

===Used on image===

Following URL should show a cropped image, but it does not appear to work onchrome. <pre>http://placekitten.com/500#xywh=percent:5,25,50,50</pre>

https://caniuse.com mentions that all browsers that have implemented something of this spec, have actually only implemented support for the <code>#t=n,n</code> control for selecting a range of video, and possibly <code>track=(name)</code> & <code>id=(name)</code>.

===Used in Audio!===
I've uploaded some files to chopchop to test with
* https://hub.xpub.nl/chopchop/~vitrinekast/videos/small.3gp
* https://hub.xpub.nl/chopchop/~vitrinekast/videos/small.flv
* https://hub.xpub.nl/chopchop/~vitrinekast/videos/small.mp4
* https://hub.xpub.nl/chopchop/~vitrinekast/videos/small.ogv
* https://hub.xpub.nl/chopchop/~vitrinekast/videos/small.webm
* https://hub.xpub.nl/chopchop/~vitrinekast/videos/song.mp3
* https://hub.xpub.nl/chopchop/~vitrinekast/videos/song.flac

The following URL should only play the video from 00:01 to 00:02!
<pre>https://hub.xpub.nl/chopchop/~vitrinekast/videos/small.ogv#t=1,2</pre>

And... For mp3 it seems to work as wel!!
<pre>https://hub.xpub.nl/chopchop/~vitrinekast/videos/small.mp3#t=1,2</pre>

However, it does seem to fully load the file, when inspecting the request, which does not save any data being downloaded.
However 2: when throttling the request to slow3g, only 277 bytes are being downloaded according to the network tab. Something to investigate further.
* Check with [https://www.charlesproxy.com/ charles] to see if the amount of bytes are actually correct, as a reduced amount of bytes downloaded could be a positive result of using this to interact with an archive
* However, in terms of radio, m3u8 files are already broadcasted in "blobs" → so maybe this is more relevant to look into

==Further checking and reading the spec==

A glossary from the spec

Media fragments support addressing the media along two dimensions (in the basic version):

'''temporal''' This dimension denotes a specific time range in the original media, such as "starting at second 10, continuing until second 20";

'''spatial''' this dimension denotes a specific range of pixels in the original media, such as "a rectangle with size (100,100) with its top-left at coordinate (10,10)";

Media fragments support also addressing the media along two additional dimensions (in the advanced version defined in [Media Fragments 1.0 URI (advanced)](https://www.w3.org/TR/media-frags/#mf-advanced)):

'''track''' this dimension denotes one or more tracks in the original media, such as "the english audio and the video track";

'''id''' this dimension denotes a named temporal fragment within the original media, such as "chapter 2", and can be seen as a convenient way of specifying a temporal fragment.

* Spatial Dimension does not seem to work in chrome → clipping the video frame
* I'm not entirely sure yet what id/track should do, and also how to set this metadata, if it is even metadata?

* I tested https://hub.xpub.nl/chopchop/~vitrinekast/videos/small.mp4#track=audio but this still loads the full video instead of only the audio track. That could be great otherwise for the archive.

### next steps
- [ ] Furher understand the Media fragment URI and what the current state of the spec is
- [ ] Read about [OggKate - XiphWiki](https://wiki.xiph.org/OggKate) an open source codec which could be used for Karaoke, but essentially allows for attaching time based metadata (see example below)
<pre>
event {
00:18:30,000 --> 00:22:50,000
meta "GEO_LOCATION" = "35.42; 139.42"
meta "DATE" = "2011-08-12"
}
</pre>

User:Vitrinekast/Checking out the media fragments URI - Revision history

Vitrinekast at 17:19, 8 November 2023

Vitrinekast at 17:19, 8 November 2023

Vitrinekast at 17:18, 8 November 2023