Comments on: Jumping to time offsets in HTML5 video http://blog.gingertech.net/2009/08/19/jumping-to-time-offsets-in-videos/ Silvia's blog Sun, 28 Feb 2010 17:51:54 +0000 http://wordpress.org/?v=2.9.1 hourly 1 By: Flash, mobiles, Firefox and more: following on from the other day… @ Technology News http://blog.gingertech.net/2009/08/19/jumping-to-time-offsets-in-videos/comment-page-1/#comment-4162 Flash, mobiles, Firefox and more: following on from the other day… @ Technology News Fri, 05 Feb 2010 08:08:45 +0000 http://blog.gingertech.net/?p=496#comment-4162 [...] then perform actions (e.g. scripts) when you hit those points?” with taking a quick look at this link I don’t see why not? You certainly seem to be able to access the current time using [...] [...] then perform actions (e.g. scripts) when you hit those points?” with taking a quick look at this link I don’t see why not? You certainly seem to be able to access the current time using [...]

]]> By: silvia http://blog.gingertech.net/2009/08/19/jumping-to-time-offsets-in-videos/comment-page-1/#comment-3933 silvia Mon, 25 Jan 2010 08:25:32 +0000 http://blog.gingertech.net/?p=496#comment-3933 The open media community rocks indeed :-) there's help everywhere! The open media community rocks indeed :-) there’s help everywhere!

]]> By: Thomas http://blog.gingertech.net/2009/08/19/jumping-to-time-offsets-in-videos/comment-page-1/#comment-3931 Thomas Mon, 25 Jan 2010 06:55:18 +0000 http://blog.gingertech.net/?p=496#comment-3931 Awesome! Thanks for the great help, onloadedmetadata instead of just onload worked fine! Great and thx again! Awesome! Thanks for the great help, onloadedmetadata instead of just onload worked fine! Great and thx again!

]]> By: silvia http://blog.gingertech.net/2009/08/19/jumping-to-time-offsets-in-videos/comment-page-1/#comment-3927 silvia Mon, 25 Jan 2010 01:58:44 +0000 http://blog.gingertech.net/?p=496#comment-3927 @Thomas, you could try simply replacing the "onload" attribute with a "onloadedmetadata" - that might do the trick. @Thomas, you could try simply replacing the “onload” attribute with a “onloadedmetadata” – that might do the trick.

]]> By: Matthew Gregan http://blog.gingertech.net/2009/08/19/jumping-to-time-offsets-in-videos/comment-page-1/#comment-3925 Matthew Gregan Mon, 25 Jan 2010 01:46:32 +0000 http://blog.gingertech.net/?p=496#comment-3925 Thomas, As of Firefox 3.6, we no longer fire the 'load' event for videos (bug 521359 at bugzilla.mozilla.org explains why), so the code you have in will never be executed. I suspect the other method you tried (setting currentTime after calling getElementById) tried to seek before the video had initialized (open the script error console via Tools->Error Console and look for an error to confirm this)--you need to wait until it's safe to seek, e.g. by waiting for the loadedmetadata event. Thomas,

As of Firefox 3.6, we no longer fire the ‘load’ event for videos (bug 521359 at bugzilla.mozilla.org explains why), so the code you have in will never be executed. I suspect the other method you tried (setting currentTime after calling getElementById) tried to seek before the video had initialized (open the script error console via Tools->Error Console and look for an error to confirm this)–you need to wait until it’s safe to seek, e.g. by waiting for the loadedmetadata event.

]]> By: Michael Ressler http://blog.gingertech.net/2009/08/19/jumping-to-time-offsets-in-videos/comment-page-1/#comment-3924 Michael Ressler Mon, 25 Jan 2010 01:38:03 +0000 http://blog.gingertech.net/?p=496#comment-3924 @Thomas, exactly to Silvia's point, I use the loadedmetadata callback like so: video.addEventListener("loadedmetadata", function () { video.currentTime = newTime; }, false); And it works perfectly. I was having similar problems with Firefox 3.5 and found this solution with Silvia's help. Good luck! @Thomas, exactly to Silvia’s point, I use the loadedmetadata callback like so:

video.addEventListener(“loadedmetadata”, function () {
video.currentTime = newTime;
}, false);

And it works perfectly. I was having similar problems with Firefox 3.5 and found this solution with Silvia’s help. Good luck!

]]> By: silvia http://blog.gingertech.net/2009/08/19/jumping-to-time-offsets-in-videos/comment-page-1/#comment-3923 silvia Mon, 25 Jan 2010 01:25:05 +0000 http://blog.gingertech.net/?p=496#comment-3923 @Thomas maybe the order in which the onload event is executed and the video load is executed has changed. I don't actually know and it doesn't actually matter. According to the HTML5 specification, you need to wait until the video is loaded, i.e. in loadedmetadata status before you can execute the currentTime attribute reliably. Otherwise it's random what happens. @Thomas maybe the order in which the onload event is executed and the video load is executed has changed. I don’t actually know and it doesn’t actually matter. According to the HTML5 specification, you need to wait until the video is loaded, i.e. in loadedmetadata status before you can execute the currentTime attribute reliably. Otherwise it’s random what happens.

]]> By: Thomas http://blog.gingertech.net/2009/08/19/jumping-to-time-offsets-in-videos/comment-page-1/#comment-3912 Thomas Sun, 24 Jan 2010 14:58:30 +0000 http://blog.gingertech.net/?p=496#comment-3912 I just updated Firefox to 3.6 and now the javascript video.currentTime no longer works. It worked perfectly in 3.5. I used the following code to start the video at a specific time that I calculated using javascript beforehand: fallback var video = document.getElementById("myVideo"); As I said, this worked fine in 3.5 but when I open the same html-file in 3.6, the video always starts playing at beginning and not at the time offset given in "TimeToJump". I also tried putting video.currentTime=TimeToJump into the on the bottom right under var=[...] but still, the video played from the beginning instead of the time offset. The example given at http://annodex.net/~silvia/itext/mediafrag.html works in 3.6 so the browser seems to be capable of playing videos at a time offset, just not with the simple video.currentTime function in javascript. The code that is used for this example is way more complicated than what I used and what used to work in 3.5! Here is the complete html-code http://pastebin.com/f40d55f69 Any help on how to get this to work as simple as possible with Firefox 3.6 (and all other browsers) would be awesome! Thx a lot for the great information so far, Thomas I just updated Firefox to 3.6 and now the javascript video.currentTime no longer works. It worked perfectly in 3.5.
I used the following code to start the video at a specific time that I calculated using javascript beforehand:

fallback

var video = document.getElementById(“myVideo”);

As I said, this worked fine in 3.5 but when I open the same html-file in 3.6, the video always starts playing at beginning and not at the time offset given in “TimeToJump”.

I also tried putting video.currentTime=TimeToJump into the on the bottom right under var=[...] but still, the video played from the beginning instead of the time offset.

The example given at http://annodex.net/~silvia/itext/mediafrag.html works in 3.6 so the browser seems to be capable of playing videos at a time offset, just not with the simple video.currentTime function in javascript. The code that is used for this example is way more complicated than what I used and what used to work in 3.5!

Here is the complete html-code http://pastebin.com/f40d55f69

Any help on how to get this to work as simple as possible with Firefox 3.6 (and all other browsers) would be awesome!

Thx a lot for the great information so far,
Thomas

]]> By: silvia http://blog.gingertech.net/2009/08/19/jumping-to-time-offsets-in-videos/comment-page-1/#comment-3882 silvia Thu, 21 Jan 2010 19:32:42 +0000 http://blog.gingertech.net/?p=496#comment-3882 Stepping through a video is a feature of a player, so it's up to the software to provide this. The URI addressing scheme can accommodate it. So, you're free to implement a video player that provides that accuracy. Current browser implementations will do the best they can and with the "currenttime" attribute in HTML5 media you will be able to control it. You can write your own javascript to test this, btw. You can get inspiration from http://annodex.net/~silvia/itext/mediafrag.html . (Though: I believe there is a bug in there that ignores subseconds). Stepping through a video is a feature of a player, so it’s up to the software to provide this. The URI addressing scheme can accommodate it. So, you’re free to implement a video player that provides that accuracy. Current browser implementations will do the best they can and with the “currenttime” attribute in HTML5 media you will be able to control it. You can write your own javascript to test this, btw. You can get inspiration from http://annodex.net/~silvia/itext/mediafrag.html . (Though: I believe there is a bug in there that ignores subseconds).

]]> By: Michael Ressler http://blog.gingertech.net/2009/08/19/jumping-to-time-offsets-in-videos/comment-page-1/#comment-3879 Michael Ressler Thu, 21 Jan 2010 13:37:10 +0000 http://blog.gingertech.net/?p=496#comment-3879 My use case for something like this would be to step through sports videos for player review. I wouldn't need audio at all. I'd just like to be able to allow my users to step frame by frame through the video. I'm looking forward to the variable playback rate for this very reason. Frame by frame stepping would be useful as well. My use case for something like this would be to step through sports videos for player review. I wouldn’t need audio at all. I’d just like to be able to allow my users to step frame by frame through the video.

I’m looking forward to the variable playback rate for this very reason. Frame by frame stepping would be useful as well.

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