During the last foss-gbg meeting I tried filming the entire event. The idea is to produce videos of each talk and publish them on YouTube. Since I’m lazy, I simply put up a camera on a tripod and recorder the whole event, some 3h and 16 minutes and a few seconds. A few seconds that would cause me quite some pain, it turns out.
All started with me realizing that I can hear the humming sound of the AC system in the video. No problem, simply use ffmpeg to separate the audio from the video and use the noise reduction filter in Audacity. However, when putting it all together I recognized a sound sync drift (after 6h+ of rendering videos, that is).
ffprobe told me that the video is 03:16:07.58 long, while the extracted audio is 03:16:04.03. This means that the video of the last speaker drifts more than 3s – unwatchable. So, googling for a solution, I realized that I will have to try to stretch the audio to the same duration as the video. Audacity has a tempo effect to do this, but I could not get the UI to accept my very small adjustment in tempo (or my insane number of seconds in the clip). Instead, I had to turn to ffmpeg and the atempo filter.
ffmpeg -i filtered.ac3 -filter:a "atempo=0.9996983236995207" -vn slower.ac3
This resulted in an audio clip of the correct length. (By the way, the factor is the difference in length of the audio and video).
Back to kdenlive – I imported the video clip, put it on the time line, separated the audio and video (just a right click away), ungrouped them, removed the audio, added the filtered, slowed down audio, grouped it with the video and everything seems nice. I about 1h43 I will know when the first clip has been properly rendered :-)
After much preparation, the tickets for foss-north 2017 is available at foss-north.se – grab them while they are hot!
The call for papers is still open (do you want to talk – register!) so we do not have a final schedule, but you will find our confirmed speakers on the web site as we grow the list. Right now, we know that have the pleasure to introduce:
- Lydia Pintscher, the product manager of Wikidata, Wikimedia’s knowledge base, as well as the president of KDE e.V.
- Lennart Poettering, from Red Hat known for systemd, PulseAudio, Avahi and more.
- Jos Poortvliet, with a background from SUSE and KDE, he now heads marketing at Nextcloud.
The conference covering both software and hardware from the technical perspective. The event is held on April 26 in central Gothenburg located between Copenhagen, Oslo and Stockholm with an international airport.
This is a great excuse to visit a really nice part of Sweden while attending a nice conference – welcome!
Another interesting weeks has passed by. We held our first Gothenburg C++ meetup with a nice turn up. We met at the Pelagicore offices in Gothenburg (thanks for the fika) and decided on a format, the cadence and future topics for the group. If you want a primer in C++ and Qt in the next few months, make sure to join us! All the details are on the gbgcpp meetup page. For those of you not based in Gothenburg, there is a Sweden C++ group based in Stockholm.
Some other, more work related news: Pelagicore are changing offices in Gothenburg and it will be an Upgrade with a capital U! We’ve signed for a really nice office space just across the street from the opera and less than five minutes from the central train station and the Brunnsparken public transport hub of Gothenburg. And as always – we are looking for developers – hint, hint ;-)
Finally, do not forget that fosdem starts in a week. I’m going, so I’ll see you in Brussels!
As some of you might know I’ve been involved in the foss-gbg group for a long while (more than 3 years now). Last year I helped starting the foss-north conference, which is really about taking what foss-gbg is and turning it into something bigger. We had a great turn-up – over 100 guests and ten great speakers.
This week, I finally got time to start pushing forward with this year’s edition of foss-north. It will be held on April 26 in Gothenburg and it is a great opportunity to visit Sweden and Gothenburg and mingle with the FOSS community. We’ve already confirmed Lydia Pintscher and Lennart Poettering as speakers. If you want to speak the call for paper has just opened and will run until March 12. Tickets sales will open shortly too, as well as the call for sponsors.
By a random chance I got involved in the organization of yet another group this week. The C++ meetup community in Gothenburg has been inactive for almost a year, so a group of people decided to pick up the ball and try to get something running. We’ve renamed the group to gbgcpp and the next (our first) meeting will be held January 26, and then we will take it from there. Hopefully this can turn into something fun!
I’ve just booked flights and hotel for QtCon. It is going to be great to see all the Qt people and some of my fellow Pelagicorians from our Munich office. For those who want to hear me speak, I’ll share my view of the world on Friday at 11:30.
The time to summarize the foss-north event has come. I’d like to start by thanking everyone – speakers, sponsors and visitors – you all made it a great event!
After the event I sent out a questionnaire which made for some interesting reading. About 30% of the visitors have replied to the questions, so I feel that the input is fairly representative.
First of all, everyone who joined the event seems happy with it. Almost everyone are likely or very likely to come next year and the same goes for recommending a friend. This sounds like a great starting point for the 2017 event.
When it comes to the scheduling, the results are a bit ambiguous. It seems that everyone wants more contents, but it is harder to tell if two days or two tracks is the way to go. I am also a bit torn on this subject. Two days mean that some people might not be able to make it due to it taking too much time, but two tracks means that everyone, even those who have the time, will miss half the contents.
All this data and much more will be incorporated into an event summary report that will be made available soon. We are also looking into the details of setting up next year’s event, so stay tuned for a date and venue.
Just a short update on foss-north – the schedule is up. We have a whole list of speakers that I’m super excited about and tickets are selling well. I still don’t know what to expect, but more than 1/3 of the tickets are gone and the sales numbers are actually even better for the full priced tickets than the early birds.
Speakers will cover everything from design, methodology, licensing, embedded tech, networking, IoT, start-ups, innovation – a broad spectrum demonstrating the versatility of free and open source.
To sum things up – it looks like we might actually pull this off and I still can treat my family with a vacation instead of paying for unused catering ;-)
I’ve written about foss-north earlier. From now, tickets are available. What we are looking at is a free and open source one day conference in Gothenburg. Great speakers already now, and the CfP isn’t even closed.
Of course you all want to visit Gothenburg in the early summer and enjoy a day of great speakers and great company. You are all very welcome!