Christian Schaller

I am heading down to Amsterdam tomorrow morning to attend IBC. Got a few meetings lined up, but I am also looking forward to hanging out with David Schleef and Jan Schmidt. I am looking forward to the conference as it will also be a big event for promoting Dirac Video.

It will be my first ever visit to Amsterdam, so I am looking forward to exploring the city. I heard they got great coffee places in Amsterdam

Thought I should let the world now we have a new employee at Collabora Multimedia. I think most of you know him already as Sebastian Dröge is one of the biggest patch reviews and bug fixers in the GStreamer community already. While Sebastian will be helping out with some of our internal projects we also plan on letting Sebastian continue his great community work. In fact the first assignment we have given him is simply to try to help out with some hard bugs thats been troubling Jokosher for a long time. So a big welcome to Collabora Sebastian, and an especially big thanks for starting your new job by taking GStreamer once again out of the top 10 bugzilla list

Currently sitting at the X Developers Summit at the Googleplex waiting for some time to pass before getting on the airplane this evening. X Development isn’t exactly what interests me mostly, but there has been some movements in terms of thinking about multimedia support issues. David Schleef did a talk here yesterday where he talked about colour handling. For a lot of Linux users, especially in the content creation industry, the lack of good colourspace correction support is a big issue.

Earlier this week I was at the CE Linux Forum meeting doing a talk about GStreamer. Talk ended up taking quite a lot less time than what I had expected it would, but still got a lot of nice feedback on it afterwards.

Bought myself one of these noise reduction headsets while here, so I am looking forward to testing out how well they actually work on my flight back to the UK.

Only thing I wish now is that I could blog about the two little ’secret’ GStreamer projects that Edward and David Schleef are working on

Been in the US for about a week now together with Wim. Our first stop was the Linux Foundation Collaboration Summit in Austin, Texas. It was a nice conference and I got to talk to a lot of people in and around the linux desktop and embedded linux. Was happy to learn how many people, especially in the embedded sector, who where aware of Collabora and our expertise around GStreamer and Telepathy.

Once the collaboration summit was over Wim and I flew up to San Fransisco and attended a meeting at Mozilla Corporation discussing how to improve the story of embedding the Mozilla engine on embedded devices. With the improvements done for Firefox 3 the current Mozilla engine kicks ass in terms of speed and memory usage, the stats they showed for running Firefox on ARM where absolutely amazing. So if their plans for a reasonably stable embedding API comes together I can see great things for mozilla/firefox in the embedded space. At Collabora we have already been helping customers with both Webkit and Mozilla work so far and it will be interesting to see which of these two engines we will end up helping our business partners integrate on their devices the most going forward.

Currently attending LUGRadio Live USA, which is an attempt at moving the LUGRadio conference concept to the US. Working out pretty well so far, although troublesome US regulations have cut away the customary beer sale at the venue. David Schleef did a lightning talk here yesterday about Dirac and the room was packed full with people, so I was very happy to see the interest around Dirac. The early buzz is just amazing. David’s Dirac talk wasn’t the only GStreamer related talk at the conference, Aaron Bockover did a nice presentation about Banshee which is progressing really nicely. I need to grab latest SVN when I get back home to test out the new video support and the super fast song database. Later today there will be a Songbird talk which I am also looking forward too. With their recent switch to GStreamer across all platforms and Mike Smith starting work there on Monday, to be their resident GStreamer expert, I think Songbird is going to be absolutely rocking.

Wim will be travelling back to Europe this afternoon as he is needed onsite at a customer site, personally I will stay another 5 days here in the bay area as there are some more open source conferences being organized which I wanted to attend. For instance I hope to be able to stop by the X Developers summit before I leave to hear about the plans Keith Packard talked about in Austin in regards to XvMC for instance. Seems media playback is a growing concern for the X hackers in terms of their priorities.

Songbird hacker Steve Krulewitz posted a blog entry yesterday outlining the progress made on using GStreamer for the Songbird music player and browser not only on Linux/Unix, but also on Windows and MacOS X.Collabora’s very own Edward Hervey has been spending the last Month in San Francisco, working with steve on getting everything going. As you see in the screen shots posted by Steve in his blog, the native codec wrappers are up and running fine, and Songbird even added a nice about:gstreamer URI for the Songbird browser, just wish all browsers had that So be sure to check out the blog entry from Steve.

I was also very excited to see Aaron Bockovers blog entry of having added video support to Banshee. Great stuff Aaron!

Spent some time early this week trying to figure out how to get my NTSC DVD’s ripped and transcoded into a format I could store and play on my PS3. My main goal was to keep the AC3 audio intact and use the best video codec possible and at the same time have it working on the PS3. After some trial and error I learned that MPEG PS was the only way to combine AC3 audio and H264 video into a file and have the PS3 be able to read it.

None of the various Linux rippers seemed to support this combination however and trying to use gst-launch I discovered that the mpeg ps muxer from gst-ffmpeg did not seem to work to well.

As part of this process I got reminded of a couple of things. The first being that we really need an relatively commonly used application using GStreamer to test and make sure our muxers and encoders keep working. Pitivi would fit that role, but its a complex application which I think is still some way away from being a tool for everyone. A simple transcoder application would probably be a better choice to get us started. That said looking at the current rippers out there the either are very targeted at a specific target (like Thoggen) or have a GUI which I think is unnecessarily complex for the average user (dvd::rip). I do not consider myself a multimedia novice, but I still only had a vague idea what the various options exposed in dvd::rip would accomplish. I am not saying dvd::rip sucks though, it was in fact the only application I was able to find for Linux which produced files that my PS3 actually recognized (although I had to use ac3 and mpeg4 part 2 in avi to make it happen.) Tried another application called Handbrake, which was fairly easy to operate although only being command line for linux, but the only files it could make that worked was h264 and aac in mp4 which meant I lost surround sound output due to my PS3 being connected by s/pdif to my amplifier.

So thinking about what kind of GUI I thought a transcoder should/could have I took a screenshot of dvd::rip and started modifying it in the Gimp. The result you see above. The idea would be that you select your input source at the top and then choose your target container format. Based on which container you choose the codecs which are supported by that container get ungreyed, while the remaining ones stay grey (unselectable). One are able to query muxers for the codecs they can mux so with the aid of pbutils one should be able to ungrey the codecs dynamically (which is an advantage as muxers could have new mappings added as time goes on.)

Once we have managed to stabilize/improve the muxers and encoders in GStreamer due to this application being tested and bugreported upon we could move this page into a ‘advanced’ tab. The new default view should then be a list of presets for various devices like N810, PS3, PSP, iPod and so on. These presets could then of course in addition to the codec choices also include resizing based on target device.

While there are use cases where one might still want/need a more advanced GUI which need all the options exposed by something like dvd::rip I think for the vast majority of us this application would do the job.

So if anyone out there would be interested in trying to hack up this application using gst-python for instance that would be really cool