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 :)
Best -- Laura Arjona Reina https://wiki.debian.org/LauraArjona
