Engineering and Developers Blog
What's happening with engineering and developers at YouTube
Recent activity: apitestjhartmann has written a tutorial
Tuesday, March 17, 2009
As you may have heard,
YouTube has been getting more social lately
. Our activity feeds help your users stay up-to-date on the cool channels and videos that their friends (or anyone else, for that matter) have been uploading, subscribing to, adding as favorites and so forth.
But we don't just care about YouTube users. We also care about developers. And we want you to have time to be more social, too.
With that in mind, Jeff Fisher and I wrote a
hands-on tutorial
that explains how to build the
YouTubeActivityViewer
, a PHP application that uses the new activity feeds. The application uses our
PHP client library
with
jQuery
. If you're still not ready to rush out and socialize, you can also build in a caching system with
memcache
.
Latest .NET SDK Released! LINQ & New Social Notifier Sample
Thursday, March 5, 2009
Posted by Frank Mantek, Google Data APIs Team
The new .NET SDK is released and available for download here:
http://code.google.com/p/
google-gdata/downloads/list
There's now updated support for YouTube V2 and a new vertical object model that allows you to use local LINQ queries. Please go through the
Google.YouTube
namespaces and see what's new there. We have some documentation for it here:
http://google-gdata.
googlecode.com/svn/trunk/
clients/cs/docs/
AdditionalContent/
YouTubeLinqExamples.html
Last, but not least, there is the
Notifier for YouTube
sample application, which showcases the
activity feeds
YouTube is exposing. You can subscribe to events from your friends and other YouTube users and get notified whenever they leave their marks in the YouTube universe. The
sample
is also available as a separate download.
The complete release notes can be found here:
http://google-gdata.
googlecode.com/svn/docs/
RELEASE_NOTES.HTML
which also lists all the bugs that were fixed in this release. Report new ones here:
http://code.google.com/p/
google-gdata/issues/list
PHP Client Library: Uploading videos now 99% more efficient !
Monday, March 2, 2009
Posted by Jochen Hartmann, YouTube APIs and Tools Team
If you are using the
PHP Client Library
to upload your videos to YouTube.com you may have had to deal with memory issues, such as the common
Fatal error: Allowed memory size of ... bytes exhausted
error message.
I am happy to announce that
as of version 1.7.6 of the client library
, this should no longer be a problem. Jeff Fisher and I have added support for streaming large video files to our API in manageable 1 MB chunks. The change is completely transparent, so you won't need to do anything besides upgrade your copy of the client library.
Prior to this change, our client library used to rely solely on the
Zend_Http_Client
object to handle HTTP communication between servers. The client makes requests by reading the entire body of your
HTTP POST
message into a string, which then gets sent to our API server. This behavior is perfectly acceptable for normal use since most of the time we are just sending XML strings or small media files such as images, but doesn't work quite so well for uploading 1 GB video files.
To address this problem, I designed a
Zend_Gdata_MediaMimeStream
object which only stores a handle to the video file being uploaded. Jeff built a
Zend_Gdata_HttpAdapterStreamingSocket
which then reads from the media stream in 1 MB chunks and sends to the socket until the entire message is read. We have tested this code extensively and are always open to feedback on how to improve performance issues in our client library, so
check out the source code
if you are interested.
While I have your attention, let me also share another trick for those obsessed with efficiency: If you are only interested in working with the raw XML instead of the complete Zend_Gdata object model, you can
flip a minor switch
that is available in all of our service classes (Zend_Gdata_YouTube, Zend_Gdata_Docs, etc.):
$yt = new Zend_Gdata_YouTube();
$yt->useObjectMapping(false);
$xmlString = $yt->getRecentlyFeaturedVideoFeed();
echo gettype($xmlString); # will return 'string'
As you can see in the snippet above, the
$xmlString
variable is now just a regular string instead of a
Zend_Gdata_VideoFeed
object. My testing shows that this can make fetching video feeds from YouTube faster by up to 35 times. Of course you would need to add a little bit of time parsing the XML with the tool of your choice (
XPath
, etc.). I should also add that those interested in parsing XML without the aid of the client library may want to check out the
Backward Compatibility Guidelines
for the YouTube Data API.
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