On 08/10/17 21:14, Wouter Verhelst wrote: > Hi Daniel, > > On Sun, Oct 08, 2017 at 08:09:23PM +0200, Daniel Pocock wrote: >> Hi, >> >> Where can I store the raw video and audio files from the MiniDebConf in >> Prishtina? >> >> Is there a workflow I can suggest for volunteers to process these into a >> format suitable for the web? >> >> We have about 30GB of data, including video files from a DSLR and audio >> recorded with a lapel microphone. > Whoa. > > I hope you used a clapperboard or something along those lines, otherwise > getting them back into sync might be complicated. The human mind is Given that over half the talks are in Albanian and they are all concatenated in 3 large WAV files, it will be complicated++. Fortunately we have two very competent Albanian speaking communities keen to help out.
> *extremely* good at detecting when A/V desync has happened; the only way > to reliably get things back into sync well enough is by using a > visualisation of the audio and to line that up with a visual cue that > can be easily related to part of the audio visualisation (like would be > the case with a clapperboard and the spike that its clap would produce). I've done this before with Blender so I understand what you are getting at. Somebody will need to identify the start points in the big WAV files and potentially cut them into smaller files and normalize them with sox. If we can create a basic wiki page for this situation then one of the hackerspace communities (Prishtina or Tirana) might have a go at it. The DSLR also had a Rode VideoMic Pro and it probably has reasonable quality audio from the audience questions, this source can be muted for the talks and enabled for the questions. As it also picks up the speakers very well it is very useful for the sync process. I've previously patched the Diktofon app to disable AGC and add high bit rates. Would anybody have any suggestions for further enhancements to Diktofon that could make it easier to sync with DSLR and mobile phone videos? > Most nonlinear editors will support doing so. One nonlinear editor that > exists in Debian is "kdenlive". Not sure whether it supports that -- > haven't tried yet. Blender is also in Debian and it is useful for this, although some people feel kdenlive is easier. I've read elsewhere that the Blender keystrokes are "wrong" for people who do this type of work regularly. https://packages.qa.debian.org/b/blender.html https://danielpocock.com/quick-start-blender-video-editing > Alternatively, sreview (https://sreview.debian.net) is capable of > processing A/V desync correction values, but it doesn't have any way to > help you line up the audio and video yet. > > If you want to do the former, you'll probably have to do more work > yourself, and afterwards one of us will have to do the upload into the > meetings archive. > > If you want to do the latter, we'll have to get the raw files uploaded > to vittoria.debian.org, I'll have to add code to sreview so that audio > from alternate sources is supported (shouldn't be too hard, can probably > get that done next weekend or maybe a little earlier), you'll have to > give me the schedule, and then you and any volunteers you want to share > the load with can do review through the sreview webinterface. > > Let me know what you decide ;) > The schedule is on the wiki: https://wiki.debian.org/DebianEvents/ks/2017/MiniDebConfPrishtina#Schedule but from what you describe, it doesn't seem like sreview is the right solution for this type of raw data. However, I would really like to upload the raw data somewhere for backup purposes at the very least, can I still put it on vittoria.debian.org and if so, under which directory? One other issue: I notice the DSLR doesn't always keep the speaker in focus when autofocus is enabled. It is a Nikon D800. Can anybody with more experience comment on this? Is there anything I can do to get the autofocus working well? Do I need to have the camera closer to the speaker for good autofocus? Or should I just put it in manual focus mode in future? Are any other DSLR models better for this? In this case, the camera was about 5- 6 meters from the speaker. Regards, Daniel _______________________________________________ Debconf-video mailing list [email protected] http://lists.debconf.org/mailman/listinfo/debconf-video
