Showreel Settings

6 replies [Last post]
Gavin Gration
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Joined: Jul 29 1999

I've eventually got round to (thinking about)putting an 8 1/2 minute showreel on my wedding pages.

I am looking for help & advice on datarates - frame sizes - buttons to shove - anything that will improve the encode quality.

My server is boggy basic so no multi-stream - but I do intend to have seperate 56k - 256k & 512k versions in Real & Windows Media.

The content for this showreel is weddings with classical music & dissolves-a-plenty (I know!!)

The encoding we've tried in the past has been OK but we kind of just accepted the presets - this time I'd like to do it better - if that's possible.

I'll be using DPS Velocity to do the encoding & the source material is from DVCam.

Gavin

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ps
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Joined: Feb 28 2001

gavin

I will respond tomorrow with information. I can't at the moment as our encoder is currently working and estimates a nice 5 hours still to go and I can't remember off the top of my head all the settings.

PS

dacquinh
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Joined: Nov 7 1999

For Real broadband I would use:

Target Audience Info: DSL Cable 256 K
Framerate: (depends on source material). If not at a lot of movement 15 fps will do and improve quality.

Target Bitrate: 250 Kbps (smoother than 300 Kbps on DSL).

Audiocodec: 44 or 64 Knps
Videocodec: 206 Kbps or 286 Kbps

Size: 320x240 px is I think very watchable

Two pass encoding: true
Variable Botrate encoding: ture
VBR startup latency: 15
Maxrimebetween keyframes: 500
High Quality resize: true
Inverse telecine: false (except your source is telecine of course)
Deinterlace filter: true

For Realvideo I would use Realvideo 8 as the version 9 codec for the moment is not very widespread

Realvideo narrowband:

size: 200x160 px
bitrate: 32 Kbps
Audio 8 Kbps or 16 Kbps
Video 24 Kbps or 16 Kbps
Other setting are he same as Realvideo broadband except for the deinterlacing which I wopuld set to false as it would not be a watchable difference and would waste encoding time.

Hope this helps

Hendrik

[This message has been edited by dacquinh (edited 03 July 2002).]

dacquinh
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Joined: Nov 7 1999

quote:Originally posted by Gavin Gration:
The content for this showreel is weddings with classical music & dissolves-a-plenty (I know!!)

Is it a slideshow or a real video?

Try to focus on the audio for the narrowband and try to avoid too many dissolves, they don't encode very well (in fact they are allmost allways crap when encoded at these bitrates because everything, every pixel changes very quickly)

Hendrik

Gavin Gration
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Joined: Jul 29 1999

"Is it a slideshow or a real video?"

It's a video comprised of high-lites from Weddings - mostly slo-mo with lots of dissolves.

Producing a web version with straight cuts would take for ever to re-edit since the source footage is spread over loads of DVCam 184's - I will try to store some cuts only clip-sequences from this seasons weddings as I go along so I can make a fresh web demo next winter.

I'm going to see how it goes with the footage I have right now & appreciate the detailed input recieved .

The next problem is that I need to find a big chunk of webspace to store it all!!

Thanks Guys,

Gavin

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ps
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Joined: Feb 28 2001

Gavin

Sorry - been a while getting back - been a workin.

Hendrik has pretty much covered Real, so I will give some suggestions for MS and QT

I agree with the frame sizes and rough bit rates. How much music do you use, or is the majority of it voice? If there is little music you can get away with lower bitrates and perhaps look at Voxware metavoice (MS).

If you want easy reverse compatibility with MS you will need to look at the MPEG 4 V2 video codec to be easily compatable with Media Player 6.4. MS, however, will download new codec's quite easily so you can go for Video V7 and now V8. V8 support VBR and Multiple bitrate so it is very nice. The quality is prety good too (we use it for our live system)

You say your source is lots of dissovles etc. Look seriously at Sorenson for Quicktime. Unless you have an Apple server you will only get pseudo streaming (progressive download), but the quality for ADSL etc is stonkin' Just look at the Apple web site and the film trailors, they are all using Sorenson. In Cleaner you can set your own keyframes, so it would be possible to just add in more keyframes at your transitions. That is how the trailors are done. You get an average keyframe / delta frame figure, but with a bit of experimenting you get nice results. Sorenson also can perform better with lower bitrates. Chuck 100kps at it and it is great, chuck 200kps at it and it doesn't perform as well type thing. The reason is it is very processor intensive and unless you have a decent processor at the decoding/playback end, the quality actually goes down. If you are going to do lots with Sorenson, you need to buy the developer version. The quality is much better than the free version.

Our live system broadcasts at the following settings:

WAN (26 links at 512K frame)

Microsoft Video 8

Video 320 x 240
109kps
15fps
keyframe every 8 seconds

Microsoft Audio 8
16kps 22Khz mono

LAN (100Mps/sec)
Microsoft Video 8

320 x 240
220kps
15fps
keyframe every 6 seconds

Microsoft Audio 8
20kps 32Khz mono

We have to have both running at 320 x 240 because everyone is using the same custom player so we wanted them all to have the same size.

These settings allow people to continue working and transfering data on the WAN. I admit we often burst over the 512K, but on the whole it runs pretty smoothly. I know I can go higher on the LAN settings, but that is the head office (which is why they get better quality anyway), and I err'd on the safe side. Rather it ran smoothly than kept stopping. That LAN is also worked V hard as it is. We are currently looking into quality of service settings for the routers, which would mark streaming packets as priority and so would guarrentee bandwidth so meaning I can really push up the data rate.

I know most of this is for live, but the theories for on-demand are still the same.

PS

Gavin Gration
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Joined: Jul 29 1999

P.S. - Thanks

Gavin

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