In my last post, I wrote about my experiences with Podcast Producer 2: the good, the bad and the downright ugly. Well, I had a bit of a breakthrough today in getting Podcast Producer 2 to “play nice with Windows,” so I’m posting my “new and improved” workaround.
As I described earlier, the main problem is the way PP2 posts videos to user blogs maintained by Wiki Server (which is a core part of Snow Leopard server). The primary culprits are the width and height tags that are included in the IMG tag that is written to the blog entry. If the video files were of a small resolution, PP2 would typically write out height tags that were empty, which breaks Internet Explorer on Windows, since IE assumes an empty height tag means a height of zero. But even if the video files were at a larger resolution, PP2 would write out width tags that were narrower than the actual width of the video file, presumably to make the thumbnail smaller than the video. That breaks any browser on Windows, since the Quicktime plugin for Windows doesn’t seem to be able to scale videos to fit within the dimensions defined by smaller-than-actual width and height tags. It works fine on a Mac, since it appears that the Quicktime plugin for Mac can shrink videos to fit into whatever dimensions are defined in a web browser.
My workaround was to manually edit these entries, removing the width and height tags. This would make the thumbnails full size, the same size as the associated video files denoted in the ALT attribute of the IMG file (a rather non-standard use of the ALT attribute, but that’s another issue). This workaround was a lot of work: manually editing the HTML of each and every video file produced by my server had become a daily chore. In the last month, I had edited over 1,000 blog entries. But at least the videos would play on Windows.
I had originally thought I should be able to fix this by changing the code found in the “_podcast.html” file found in the WikiTemplates folder in Library->Application Support->Apple->WikiServer. After all, this file looks like the exact template used by PP2 when it posts to WikiServer. But even though I removed the width and height attributes from this template file, it had no effect on the blog entries posted by PP2. I have since found that these templates are not used by PP2; they are used by WikiServer itself. That is, when you go to a user blog, click the plus sign to manually add a blog entry, and select the option to add podcast content, the resulting code is drawn from the _podcast.html file in the WikiTemplates folder. So PP2 must be getting the code from somewhere else.
Today I found out where: in a line of code in /usr/lib/podcastproducer/actions/wikiserver.rb. Near the top of this file is the following line…
MOVIE_ERB_TEMPLATE = "<%= h($properties[\"Description\"]) %> <br> <br> <img src=\"<%= poster_image_url %>\" alt=\"<%= published_url %>\" width=\"<%= width %>\" height=\"<%= height %>\" class=\"aligncenter posterimg\" />"
Bingo. I just took out the width and height tags from this line and restarted the server. Now PP2 doesn’t write out the width and height tags when it posts video podcasts. And I no longer have to manually edit the posts produced by PP2 to enable them to work on Windows. Hallelujah.
While studying this file, I think I discovered what may be the reason why PP2 is mucking up the dimension attributes. Further in this file are these lines of code…
if width > 480
height = PcastQT.info(input_published_path, "height").to_i * 480 / width
width = 480.0
So if I understand this correctly, what this does is check if a video is wider than 480, and if so, force it to stay at a width of 480 and adjust the height downward proportionally. That is, if a video has standard “VGA” dimension of 640 wide by 480 high, this bit of code forces it to be 480 wide by 360 high (the original height 480 multiplied by 0.75, or 480/640). And again, this scaling of the thumbnail downward is what seems to be breaking the Quicktime plugin on Windows.
I’m still not sure why videos that are smaller that 480 wide are being posted by PP2 with an empty height attribute, but I have a theory. I notice that in this section of code that the width is explicitly defined by this line of code:
width = PcastQT.info(input_published_path, "width").to_i
But height is not explicitly defined UNLESS the “if width > 480″ is evaluated true. This could be why I’ve discovered that for smaller submitted videos (say at a resolution of 320 by 240) the code being posted by PP2 has an empty height attribute (specifically, height=””). But whether or not this theory is correct, I’m happy that I’ve discovered a fix. By removing the width and height attributes completely from the MOVIE_ERB_TEMPLATE line of code, I’ve effectively addressed both the empty height attribute problem and the scaled-down width attribute problem.
Of course, Apple is likely to rewrite this file with a software update. Here’s hoping they correct this problem, so that I don’t have to hack the same file in the future. But just in case, I’ve documented my fix here for my reference, and potentially for the benefit of others frustrated trying to get Podcast Producer 2 to play nice with Windows.
var objectHTML = '<object classid="clsid:02BF25D5-8C17-4B23-BC80-D3488ABDDC6B" width="'+img.width+'" height="'+(img.height+(extendHeight?16:0))+'" codebase="http://www.apple.com/qtactivex/qtplugin.cab"><param name="SRC" value="/collaboration/fake.qti"><param name="QTSRC" value="'+fullSrc+'?sessionID='+server().sessionID+'"><param name="TYPE" value="video/quicktime"><param name="SCALE" value="aspect"><param name="AUTOPLAY" value="true"><param name="CONTROLLER" value="true"><param name="TARGET" value="myself"><param name="BGCOLOR" value="'+backgroundColor+'"></object>'
4 thoughts on “Getting Podcast Producer 2 to Play Nice With Windows”
I reported this bad behavior with QuickTime 7.6.4 on Windows (it works on prior versions), and finally Apple has acknowledged it’s a bug in the Windows version of QT. The bug ID is 7222681.
Right. I did notice that scaled-down videos could play back on older versions of the Quicktime plugin for Windows. However, if videos submitted to PP2 weren’t at least 480 pixels wide, the height=”” bug would break IE on Windows (but not Firefox). So for the moment, I think the best approach to get PP2 to play nice with Windows is to simply delete the width and height attributes. This could be impractical for very large encoding settings (like the Apple TV option) but for posting to user blogs, I think 640 x 480 is plenty big enough.
First, let me say, thanks for your work on this. Secondly, that I’m using Podcast Producer on Leopard, not Snow Leopard.
When I upload a video smaller than 480px wide, I see no problem with the width and height attributes (ie, both contain correct numeric values with the height increased by 16 pixels to account for the controls).
If I edit that same file and change the to something invalid like which effectively eliminates that parameter, videos suddenly work in Windows. However, any that are larger than the 480×335 window that is the standard scaled size play in their native resolution but in the smaller object window, so cropping occurs. Not at all optimal.
FWIW, I’m more inclined to attempt a fix on the display layer than on the import side, as such a fix would then cause all prior videos to display correctly, and could be undone when a solution for the bug comes from Apple. Of course, if there’s a bug in PcP 2, that’s a different issue.
I would be interested in seeing the output of alert(objectHTML); in your PcP2 environment.
In PcP 1, it’s important to note that it’s the SCALE parameter causes videos that are larger than the dimensions of the player to fail to properly display in Windows with QT 7.6.4. Videos that are smaller than the dimensions of the player work fine even with the SCALE param set.