Talk:Conference Recordings

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Disamiguation Official / Inofficial

Does the term official apply to the video files or to the servers? I'm asking as there are different mirrors in the inofficial Section that contain only the official Matroska and MP4 Files and others have local copys of the wmv streams on their servers which are "inofficial" video files. --Mastacheata 17:52, 29 December 2007 (CET)

The term applies to the video files. The official recordings are done by teams working for the CCC (FeM and fefe and others).
Inofficial recordings are transcodings of the official streams or of other sources (like DVB-T Broadcast). --Niere 18:31, 29 December 2007 (CET)

Inofficial Recordings

Does anybody have an idea how tho play these files? mplayer, vlc, aviplay, all seem to not do the job. -- divby0

The Inofficial Mirrors are mostly (at least mine[thematrix-reloaded] and the one by c-otto)copies of the wmv Streams from FeM. So you should be able to play the asf (Microsofts Container Format) and wmv files with mplayer if you have codecs for windows media video installed. --Mastacheata 01:29, 29 December 2007 (CET)

Directory Naming Convention

hi.. I'm not very happy with the naming convention (including whitespace and parentheses). Nevertheless: the official recordings are online. What about creating folders "day1", "day2" etc..? just an idea.. (sak)

As there are only recordings of day1 at the moment I don't think this disambiguation is needed yet. But with the Naming Conventions of the Files themselves you're probably right. --Mastacheata 17:55, 29 December 2007 (CET)
You can find all that information in the Fahrplan. The directory structure stays flat. --Niere 18:31, 29 December 2007 (CET)


Thank you very much. Thanks!!! --Casandro 08:54, 29 December 2007 (CET)

Thanks to all who are involved in publishing the videos so fast! -- Loom 19:52, 29 December 2007 (CET)

Thank you for your effort! -- Ankon 20:56, 29 December 2007 (CET)

OT: Media from 23c3

are there videos from last year?

All videos should be available at

are there videos from last year?


(or ftp)

--Ksandre 22:16, 30 December 2007 (CET)

The old list of mirrors can be read but not anymore updated here:

--Bugmenot 01:00, 15 January 2008 (CET)

Broken Files

Can anybody confirm success when playing the file 24c3-2293-en-what_can_we_do_to_counter_the_spies? It seems to be broken and stops after a few minutes. No alternative (mpeg4) available yet.

Resume the download. --Tørstig 03:48, 10 January 2008 (CET)

Why VGA instead of PAL ?

Why the heck do you squeeze the PAL video to VGA resolution ? You had PAL, stay with PAL ! Don't mess the quality by shrinking the resolution ... If I wanted quirky video's I would have recorded the streams ...

The motivation to use 640x480 for iPod compatible videos should be obvious. In the general case it is still a good idea to adjust screen resolution to a mod16 square pixel format and deinterlace the video. Signaling PAL pixel aspect ratio and interlaced content through metadata is admittedly possible but not really robust. Of course this assessment might change in the future. Concerns about reductions in quality due to resizing are likely overblown though. The conversions from DV->FBAS->MPEG2->H.264 probably impact video quality much more than the final resize to 640x480. Ultimately you'd have to ask fefe about his motivations to use these specific settings for his non-iPod encodings. --Mfeiri 20:37, 2 January 2008 (CET)
I just asked Fefe and he said that the cameras that the FEM team used had a big black border to begin with. After cropping that border away the image wasn't much bigger than 640x480, so there wasn't that much scaling necessary. (And furthermore the original signal was already rather bad quality due to the long distance, so scaling didn't make much of a difference.) --Henryk 00:40, 6 January 2008 (CET)
In the Cameras there were DV tapes, I suppose they were thought only for emergency Backup, if everything else get's messed up, but still they should deliver good DV quality(so better that DVD or DVB) image. Why not use Those for the non-realtime Recordings ? Chippy 10:57, 7 January 2008 (CET)
It is simply because using the tapes would imply a huge additional effort. Naturally the tape has only recorded the cam's view, not the scanline converter with the presentation. So to produce a good video would mean to a) read all the videotapes onto harddrive (time consumption == tape runtime, e.g. one hour per 1h tape), b) somehow convert the presentation file into something useful (time consumption unknown), c) again cut and mix those two or more video sources to a final movie (time consumption >> tape runtime) , d) put in the audio as well and e) finally produce all wanted encoding formats (would be pretty automatic, but time consuming as well). Even if things run smoothly, that would mean at least three times the time of the original event. This four-day-congress would need 12 days with three teams to re-cut - working full-time. More than unlikely to happen.
Of course we all would be happier if the technical solution applied gets better quality. Just have a look at the FEM Abschlußbericht presentation, especially Fefes part. First assumption was: There's a DV signal coming out of the wall that just needs to be recorded - but things are not as simple as that, even though it shouldn't be too much of a problem for the NOC to provide a separate network to transmit a 25 MBit DV video stream to be recorded, transcoded and broadcast. But this needs proper hardware (cams, video mixers, monitors, capture cards etc.) in the lecture rooms, and if the FEM does not bring such hardware (maybe because they do not OWN it), then all those nice plans fold, and you are stuck with "crappy" FBAS over long distance lines.
I am very happy with the fact that this time the videos were completely available really short after the congress. Compare this with the publishing of the CCCamp2007 or previous congresses. The next task naturally is to keep this level and add quality - on the next congress. :)
Herold Angel Svenr 02:00, 11 January 2008 (CET)

Audio in MKVs out of sync

It's quite irritating that the matroska videos have unsynced audio. I got them using the torrents from the pack from Aren't they supposed to be repaired?

Apart from that it's nice to see that their size has (again) decreased compared to the videos of the previous congress.

Why dows anyone want smaller files ? Want to squeeze all recordings on a single CD or what ? We have all our decently fast Internet connections, we can handle getting 500 Megs per Hour of Video (instead of 100), hopefully then also with better quality. And seeing that I can get the torrents with over 2MBytes/s I assume that there are enough seeders, so distibution bandwith seems to be no problem. So what is so nice about the files beeing smaller ? Chippy 11:05, 7 January 2008 (CET)
Ok, ich will es mal ein einem Video konkretisieren, da mir aufgefallen ist, daß nicht alle Vidoes davon betroffen sind (bzw. weniger krass). Gleich das Erste (2158-en-the_arctic_cold_war) hat noch ziemlich deutlich zeitverschoben Ton. Alle Videos die beim Seek innerhalb der Titelsequenz ein Knacken verursachen*, scheinen nicht in Ordnung zu sein. (*: MPC, ffdshow-tryout, filter sind: container -> MPC, H.264 video -> CoreAVC, vorbis audio -> MPC). --Tørstig 01:24, 5 January 2008 (CET)
Sorry, for German. Anyway, I found that the offset correction in the above mentioned video is about -300ms using MPC. The other videos need an offset correction of less than 100ms, which is hard to determine. And example for a video with better sync is 2293-en-what_can_we_do_to_counter_the_spies. --Tørstig 01:31, 5 January 2008 (CET)

Checksum mismatches

The videos from the tracker seem to be different from the FEM http/ftp server...

Why all this chaos? When will there be final versions made available? --Tørstig 22:15, 5 January 2008 (CET)

Read the main article. Short: the fefe's version is the final. Mirror admins should get this final version. Normal viewers who just want to view a recording one time only should keep the version they have. --Ftpguy
Yeah, I know that the article says that. But some of fefe's final videos still have a/v syncing problems. See my section above. So I guess that's it then? --Tørstig 03:43, 10 January 2008 (CET)

Some videos missing in iPod compatible format

There are still some videos missing in that format. As they can be played on the Playstation 3 as well, I just wanted to ask, if and when it is planned to release them too. Watching event videos on the TV while laying on the couch is great fun, so I'd prefer that format. I'd love to help out in converting the missing files but I have no experience with video encoding at all. Hints and Links are welcome, preferrably for Linux. Venty 09:22, 7 January 2008 (CET)

It is definitly planned to release the missing videos in ipod compatible format, my latest news is that there will be other releases this week (hopefully we manage to release all the rest this week), just keep watching the FeM FTP-Server, maybe someone will post about new releases on the FeM blog.AgtMulda 09:54, 8 January 2008 (CET)


Might be slightly off-topic to some, but I just wanted to say "THANK YOU GUYS" for the great effort, bringing the videos online so fast! Great job! Venty 09:07, 7 January 2008 (CET)

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