Bergel, Alexandre wrote:

Thanks Goran,

This is great!

Would it be possible to get the raw file? I would like to put it on youtube

Cheers, Alexandre

The avi file is plenty good enough for u-tube. I have been attempting to upload these videos to google video for several days now.

Keith

Hi fellas!

The "raw file" is about 12Gb for 1 hour. :) I am using XviD, 2-pass encoding and setting size to 700Mb (though they seem to end up around 780). This was a quality level I ended up with when I taped Bryce in Brussels - in order to have legible text on the projector.

Someone told me to use a quantizer - perhaps it was Marcus Denker? I haven't done that though - should check before encoding the rest of the tapes.

I will try to get some more files done later tonight.

regards, Göran

I think youtube has a limit that is well below the 1h length and 700MB size. Here [1] is a version of the first video on sevenload.

Alex

[1] http://en.sevenload.com/videos/fLnZ2gj/Squeak-BOF-OOPSLA-2007-1-3

Bergel, Alexandre schrieb:

...

Thanks Goran,

This is great!

Would it be possible to get the raw file? I would like to put it on youtube

Cheers, Alexandre

On 25 Oct 2007, at 08:28, goran@krampe.se wrote:

...

Hi folks!

Ok, the first tape is up now - second will be up very soon, third coming in a day or two, read more here:

http://goran.krampe.se/blog/OOPSLA/OOPSLA07-1.rdoc

regards, Göran

I used avidemux2 to get the video size below 200Mb. I cut the resolution by half, smoothed the result for better compression (again with xvid), changed the audio to mono and ac3 (at least for the first video). The first video came down to 196Mb and the second one to about 130Mb.

The second video can now also be seen at:

http://en.sevenload.com/videos/r8msK6w/Squeak-BOF-OOPSLA-2007-2-3

Alex

Andres Valloud schrieb:

Hey Göran,

It seems to me you're dealing with MiniDV video.

If you're encoding a one hour long tape, then it's very likely those 80mb may be the audio which is not accounted for. Now, MiniDV cameras typically record in 12bits/44khz, or 16bit/32khz. Either way, if you convert down to mono and downsample to 32khz with an audio program, then you can use something like 48kbps LAME CBR mp3 encoding, which will reduce the amount of space you need to dedicate to the audio. This should sound reasonably well. If you're inclined to, you may want to train a noise reduction filter and run the audio through that first. If all you care is about voice, you can downsample all the way down to 22khz or even 16khz without much loss of anything. If you go below 16khz, then female voices will start suffering. Less khz, less bitrate necessary to encode it, and more bits you can dedicate to video.

Regarding the video, and particularly for presentations, you may want to run the raw file through a temporal smoother filter. VirtualDub has one, and I've used it more than once with very nice results (e.g. about 80 mins of DivX half resolution video in about 200mb, including the audio!). This will eliminate noise while making video look very nice, and a side effect is that you get better quality from the video encoder since it has less high frequency noise to deal with. In other words, less bitrate dedicated to the grainy mess, and more bitrate dedicated to e.g.: making the slides legible :).

Something else that you may want to try is either tell XviD to preserve the interlace, or just deinterlace the video altogether. Deinterlacing properly without ruining the resolution is difficult, but done well it looks fantastic in progressive monitors. Essentially you get (assuming PAL) 50fps of almost full resolution frames. The only bad thing about this is that it takes more space. You may get away with it if you run the whole thing through a temporal smoother filter first.

Hope this helps, Andres.

Göran Krampe wrote:

...

Hi fellas!

The "raw file" is about 12Gb for 1 hour. :) I am using XviD, 2-pass encoding and setting size to 700Mb (though they seem to end up around 780). This was a quality level I ended up with when I taped Bryce in Brussels - in order to have legible text on the projector.

Someone told me to use a quantizer - perhaps it was Marcus Denker? I haven't done that though - should check before encoding the rest of the tapes.

I will try to get some more files done later tonight.

regards, Göran

...

I think youtube has a limit that is well below the 1h length and 700MB size. Here [1] is a version of the first video on sevenload.

Alex

[1] http://en.sevenload.com/videos/fLnZ2gj/Squeak-BOF-OOPSLA-2007-1-3

Bergel, Alexandre schrieb:

...

Thanks Goran,

This is great!

Would it be possible to get the raw file? I would like to put it on youtube

Cheers, Alexandre

On 25 Oct 2007, at 08:28, goran@krampe.se wrote:

...

Hi folks!

Ok, the first tape is up now - second will be up very soon, third coming in a day or two, read more here:

http://goran.krampe.se/blog/OOPSLA/OOPSLA07-1.rdoc

regards, Göran