[PLUG-AV] Last night's recording

[Jason Nicholls]

Video quality seems good enough although size works out to 157MB/hr

- that flickering sucks, i'd prefer not to include it in the future :( (i.e.
we gotta work out what's wrong)

- that audio does NOT sound like it's from the wireless mic, almost certain
it's from one of the cameras (or worse, my laptop built-in mic). The lapel
mic sound is very different as it doesn't pick up the surrounding sound (as
much) where as this mic is clearly picking up the hum sound from the switch.
The interference with the wireless mic sounds more like AM radio static and
it's not that. We really need to verify audio before streaming/recording
next time - need to get some practice in and put together a checklist...

- It's just a bit too long, I think we should be giving a guideline to
speakers for 1hr max including questions. Really a talk of 45mins is the
upper limit and around the 30min mark would be better.



On Thu, May 12, 2011 at 10:07 AM, James Bromberger <james at rcpt.to> wrote:

>
> OK, here's a first draft - I left it running to proced a file that I could
> potentially share with people. I'm clearly not going to copy 17 GB to you!
> :)
>
> wget this file (I would advise against looking in a  browser):
> http://www.plug.org.au/video/2011/IPv6-talk-1pass-slower-28.mp4
>
> It's 245,184,261 bytes. Then if you have time and want to make it better,
> send me an SSH key and I'll get you on to Av2 - the "Brad Cambell" AMD64 box
> we got together - its now installed and comes in at just over 4000 bogomips
> - dual core, 4 GB ram, 75 GB SCSI disk. I can copy the DV file on there, and
> you can use whatever tools you want to filter & process this file!
>
> If no one can be bothered, then the file I have becomes the final copy and
> we move on! :)
>
> Things I noted;
>
>    - The new camera we bought does seem to flicker a lot in the resulting
>    video, as we noticed on the night. Don't know if it needs maintenance on the
>    camera (perhaps contact the manufacturer)? Tim, how did you go with
>    disabling demo mode, and anything else you've discovered?
>    - Our audio does still suck. As does the copy Gary had (I had a listen
>    to a sample).
>    - The LinuxOutlaws podcasts talks about buzz on using on-board audio
>    inputs, and recommends using a USB audio input so that your line in isn't
>    anywhere near the laptop power circuit.
>
>
>
>
> On 11/05/2011 11:35 AM, Jason Nicholls wrote:
>
> Hey James,
>
>
>
>  I've copied the video file to my little Revo box, and he's happily
>> encoding using Jason's magic command line from an earlier post. I couldn't
>> get the hqdn3d filter to work, so I dropped that one and proceeded. It's
>> currently processing at 3fps; given 118k frames, that's 11 hours until it
>> completes this encoding to MP4 (it's not a fast box being an Atom, but it
>> can sit there doing it all day while I try and work).
>>
>
> The filters depend on how the video comes through, the hqdn3d filter is
> good if there is low light (and therefore the image is a bit grainy),
> otherwise it's best without it. Generally the yadif (de-interlace) and
> unsharp (sharpen) filters are good though.
>
>
>
>> I'll send an update when its encoded.
>>
>
> I'd recommend quitting the encoding so that you can watch it and ensure the
> quality is OK (for some reason i can't play the files unless I quit and it
> writes something special to the file - dunno). Finding the sweet spot "-crf"
> for the lighting/conditions etc... I think 28 is the starting point but may
> need lower if there is more action and especially check the slides are
> readable.
>
>
>
>
>  Jason Nicholls
> jason at mindsocket.com.au
> 0430 314 857
>
>
>
> --
> *Mobile:* +61 422 166 708, *Email:* james_AT_rcpt.to
> PLUG President 2011: http//www.plug.org.au <http://http/www.plug.org.au>
> Perth.pm Organiser 2011: http://perth.pm.org
>
> _______________________________________________
> AV mailing list
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>
>


-- 
Jason Nicholls
jason at mindsocket.com.au
0430 314 857
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