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Re: [Debconf-video] Videos of MiniDebConf Bucharest 2015 (Debian Women)

Hi Wouter

El 23/10/15 a las 09:24, Wouter Verhelst escribió:
> Hi Larjona,
> On Thu, Oct 22, 2015 at 10:58:24PM +0200, Laura Arjona Reina wrote:
>> Dear DebConf-Video team, Debian Women and Debian MiniDebConf Bucharest
>> team:
>> Marga passed to me several months ago an url to the RAW video files,
>> named 00000.MTS to 00007.MTS
>> I've watched all of them and uploaded to my site the ones with talks:
>> http://cosas.larjona.net/2015_minidebconf_bucharest/
>> (the others are recordings of the room while breaks etc).
>> In that folder there is also a txt file with the hh:mm of cuts for the
>> different talks.
>> Note that I only have the talks of Saturday, I don't know if there are
>> more videos in other place (sorry, I lost the original URL that Marga
>> gave me too, I just downloaded the videos that were there, and didn't
>> save the URL).
>> I don't know if the video team may upload the videos plus the txt file
>> for now, or better to finish the work first.
> It's better to finish the work first, IMO.
>> So, the pending work. I have no idea about video
>> editing/transcoding/formats, but I suppose the next steps would be:
>> 1.- Actually cut the videos, and transform them to webm format
>> (ogg+theora vorbis). I suppose I can use openshot or kdenlive for
>> that. I know how to cut the videos. I'm more lost about the format and
>> quality desired for the output. If you can help me giving me the
>> details about format resolution, fps or quality, whatever I have to
>> tell to openshot o kdenlive in the "export" process, I'd be very
>> thankful for that.
>> 2.- If possible, enhance the audio (volume + deleting noise). I have
>> no idea about how to do that, nor which tool to use.
>> My best machine to do this work is a laptop year 2011 with AMD dual
>> core processor E300, AMD Radeon HD 6310, and 6GB RAM, which runs
>> Debian stable. I suppose it can do the work but may take days, that's
>> why I'd like to know well in advance how to proceed.
>> Any advice?
> I would recommend against doing this in interactive tools. If you've
> already looked at the videos and decided where the cuts need to be, then
> entering those cuts in an interactive tool is just a waste of time. Far
> faster to script all that.
> I've blogged about this during Debconf:
> http://grep.be/blog/en/computer/play/Multi-pass_transcoding_to_WebM_with_normalisation/
> That post contains a perl script snippet which generates some shell
> script that will do the cutting and audio normalisation for you with
> another script that uses gstreamer and sox. Yes, it's terribly ugly, but
> it should get you started. You may need to modify the "dv2webm" script
> so that it has the appropriate settings for reading MTS files rather
> than DV ones.
> It doesn't have any specific settings for video quality (just uses the
> gstreamer defaults), which seems to result in "use whatever bandwidth is
> necessary", and I think that's a good default for non-live video
> (obviously it isn't for live video, but then that's not what we need
> here).
> In addition, I've since learned that there is actually a broadcasting
> standard about audio normalisation which the sox line in my script
> doesn't do. There is a tool called "bs1770gain" in the archive which I'm
> told does do so. I had decided not to change audio levels for debconf
> anymore (since I learned about it halfway through debconf already, and I
> wasn't sure I could finish all transcoding in time if I had changed it
> anymore), but it's something I think we should do for future recordings.
> I'm not very knowledgeable about the "cleaning up noise" part of doing
> audio; you'll have to find someone else to figure that out. However, if
> the noise is not too distracting and/or not too loud, I would suggest
> you don't remove it; in a recording of a talk, it's actually beneficial
> to have some minor background noise.
> Other than that, if you've got any further questions, fire away.
Thank you very much for the information. I'll have a look at the blog
post and the scripts and try to find my way. Doing the task from the
commandline looks more interesting than with the interactive aka
freezing-in-my-computer tools :)

Laura Arjona Reina

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