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MPEG-2 Music Videos :-) Alan Crosswell [email protected] Outline The Content Network Issues Production Issues Show and Tell CODEC Issues and Requirements Outline The Content Network Issues Production Issues Show and Tell CODEC Issues and Requirements The Content

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MPEG-2 MusicVideos :-)

Alan Crosswell

[email protected]


Outline l.jpg
Outline

  • The Content

  • Network Issues

  • Production Issues

  • Show and Tell

  • CODEC Issues and Requirements

Columbia University Academic Information Systems


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Outline

  • The Content

  • Network Issues

  • Production Issues

  • Show and Tell

  • CODEC Issues and Requirements

Columbia University Academic Information Systems


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The Content

  • Violin Master Class – December 8, 2000

    • Student: Wu Jie, at CANARIE in Ottawa.

    • Teachers: Pinchas Zukerman and Patinka Copec (of MSM) in New York (at Columbia).

    • Manhattan School of Music, CANARIE, National Research Centre, Natl Arts Centre.

    • Pt-to-Pt Litton CV2 MPEG2 & mcast MPEG1.

Columbia University Academic Information Systems


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The Content

  • Dance Rehearsal/Conference – Jan 6, 01

    • Peter Sparling Dance Company in Ann Arbor.

    • Association for Performing Arts Presenters conference in New York.

    • Demonstration/discussion of an in-progress commissioned work involving dances, costumes, set designs.

Columbia University Academic Information Systems


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The Content

  • Cello Master Class – May 10, 2001

    • David Geber of MSM in New York (at CU).

    • Erin Dunn at University of Oklahoma

    • YAML (Yet Another Music Lesson:-)

Columbia University Academic Information Systems


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Outline

  • The Content

  • Network Issues

  • Production Issues

  • Show and Tell

  • CODEC Issues and Requirements

Columbia University Academic Information Systems


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Network Issues

  • Campus network

    • 1% packet loss is not good enough w/CV2.

    • CV2 at 15.4 Mbps sends 16K PDUs via UDP:

      • 11 IP fragment Ethernet packets.

      • 352 ATM cells.

    • Drop one cell and the whole PDU's lost.

    • ATM issues - cell loss, policing, bursts.

Columbia University Academic Information Systems


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Network Issues

  • Abilene/CANARIE ATM issues

    • Getting clobbered by QoS (shaping, policing).

    • ATM cell loss on NYCM OC-12 intf

      • Several sub-rate VCs.

      • OC-12 was not oversubscribed.

      • One 24 Mbps VC was heavily congested (JANET).

      • Caused head of line problems for other VCs.

    • Brent made it go away.

Columbia University Academic Information Systems


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Network Issues

  • Some things to look for on campus:

    • 100-full duplex negotiated correctly?

    • Router ATM interface CRC errors?

      • ATM cell loss (policing, default burst length)?

      • Cisco PA-A3 (OC3 ATM) SAR HW 1.0?

    • Analog video causing Codec resets that convince you there’s a network problem.

Columbia University Academic Information Systems


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Outline

  • The Content

  • Network Issues

  • Production Issues

  • Show and Tell

  • CODEC Issues and Requirements

Columbia University Academic Information Systems


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Production Issues

  • Demos Harder than the “real thing.”

    • A large audience for a one-on-one event.

    • Added sound amplification adds echo.

    • Complicates echo cancellation.

    • Video monitors/projection screens.

    • Lighting for two-way video at the same time as projecting is goofy.

Columbia University Academic Information Systems


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Production Issues

  • Audio

    • Emphasize audio over video quality.

    • Pops, squeals, screeches, drop-outs, echoes.

    • Audience will accept a few video artifacts.

    • Room-filling "rich" audio compensated for poor video in one event.

Columbia University Academic Information Systems


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Production Issues

  • Audio engineers dealt with:

    • Room acoustics at both ends.

      • Drapes and foam where hung.

      • Gobos used to isolate codec fan noise.

    • Some echo is a good thing: room was too dead, so...

    • Remote echo was used to liven the room.

Columbia University Academic Information Systems


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Production Issues

  • Audio echo avoidance

    • Can't use a voice-grade echo canceller for music.

    • Off-axis speaker/mic placement.

    • Gobos isolating mics from speakers.

    • Masking the backs of mics to control echo.

    • Muting ruins spontaneity.

Columbia University Academic Information Systems


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Production Issues

  • Audio for world-class musicians

    • Doing audio for people who can hear the difference.

    • Frustrating not being able to directly monitor the remote room.

    • Maintaining a natural listening level.

    • Shaping of the audio by codec, etc.

Columbia University Academic Information Systems


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Production Issues

  • Video (bush league)

    • Switching sources *must* have a time base corrector (e.g. video mixer).

    • A simple video switch causes a ~5 second CV2 encoder reset.

    • Which also kills the audio.

    • Bad video (loose connector) causes encoder resets which manifest as audio dropout.

Columbia University Academic Information Systems


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Production Issues

  • Video

    • A prosumer mixer boasts 500 effects.

    • Don’t <BLINK>have</BLINK> to use them.

    • Prosumer mixer quality is just that.

    • PIP may show annoying artifacts.

    • Good lighting, camera quality and operator skill (get a pro video crew if it is important).

    • Plug a $200 camera into a $20,000 codec….

Columbia University Academic Information Systems


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Production Issues

  • “How do you get to Carnegie Hall?”

  • “Practice, Practice, Practice”

    • In a new campus location, begin testing one month beforehand to have plenty of time to deal issues that will come up.

    • When dealing with a new partner, there will be new routes and performance issues.

    • Both ends need to rehearse from the actual location of the event.

Columbia University Academic Information Systems


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Outline

  • The Content

  • Network Issues

  • Production Issues

  • Show and Tell

  • CODEC Issues and Requirements

Columbia University Academic Information Systems


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SKB portable rack

The Road Show

Columbia University Academic Information Systems


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SKB portable rack

Flat panel drawer

The Road Show

Columbia University Academic Information Systems


The road show23 l.jpg

SKB portable rack

Flat panel drawer

Keyboard/mouse drawer

The Road Show

Columbia University Academic Information Systems


The road show24 l.jpg

SKB portable rack

Flat panel drawer

Keyboard/mouse drawer

Video proc amp

The Road Show

Columbia University Academic Information Systems


The road show25 l.jpg

SKB portable rack

Flat panel drawer

Keyboard/mouse drawer

Video proc amp

Stereo mic/line mixer

The Road Show

Columbia University Academic Information Systems


The road show26 l.jpg

SKB portable rack

Flat panel drawer

Keyboard/mouse drawer

Video proc amp

Stereo mic/line mixer

Stereo VU meter

The Road Show

Columbia University Academic Information Systems


The road show27 l.jpg

SKB portable rack

Flat panel drawer

Keyboard/mouse drawer

Video proc amp

Stereo mic/line mixer

Stereo VU meter

Litton CV2 MPEG-2 codec

The Road Show

Columbia University Academic Information Systems


The road show28 l.jpg

SKB portable rack

Flat panel drawer

Keyboard/mouse drawer

Video proc amp

Stereo mic/line mixer

Stereo VU meter

Litton CV2 MPEG-2 codec

PC w/Z360 H.323 codec

The Road Show

Columbia University Academic Information Systems


The road show29 l.jpg

SKB portable rack

Flat panel drawer

Keyboard/mouse drawer

Video proc amp

Stereo mic/line mixer

Stereo VU meter

Litton CV2 MPEG-2 codec

PC w/Z360 H.323 codec

PC w/IPTV MPEG-1/2

The Road Show

Columbia University Academic Information Systems


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Belkin PC switcher (remoted to kbd drawer)

Video & Audio DAs

The Road Show

Columbia University Academic Information Systems


The road show31 l.jpg

Belkin PC switcher (remoted to kbd drawer)

Video & Audio Das

Audio/Video patch bay

The Road Show

Columbia University Academic Information Systems


The road show32 l.jpg

Belkin PC switcher (remoted to kbd drawer)

Video & Audio Das

Audio/Video patch bay

Biamp echo canceller

The Road Show

Columbia University Academic Information Systems


The road show33 l.jpg

Belkin PC switcher (remoted to kbd drawer)

Video & Audio Das

Audio/Video patch bay

Biamp echo canceller

UPS

The Road Show

Columbia University Academic Information Systems


The road show34 l.jpg

Belkin PC switcher (remoted to kbd drawer)

Video & Audio Das

Audio/Video patch bay

Biamp echo canceller

UPS

Still missing/unfinished:

Headphone monitor

DV capture

Echo canceller + bypass

The Road Show

Columbia University Academic Information Systems


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Videonics MXPro DV :-(

Canon GL1 camera.

Tripod.

Powerbook w/PPT for title slides (use S-video out).

2 SM57 mics.

2 Samsung VGA/Video 15" TFT monitors.

2 DELVCAM 5.6" TFT monitors.

test generators (SMPTE bars, tone).

miniDV recorder.

2 S-Video to S+Comp DA.

lots and lots of cables.

adapters.

gaffers tape.

The Road Show

Columbia University Academic Information Systems


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The Road Show

  • Interfacing with the pros(umers)

    • Balanced vs. unbalanced audio (the audio engineers will get over it:-)

    • mic/line mixer with balanced XLR, TRS, mic and line jacks makes it easy.

    • Composite vs. S-video vs. component vs. firewire.

    • Chose S-video throughout the rack.

    • DV->analog conversion in the Videonics.

Columbia University Academic Information Systems




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Outline

  • The Content

  • Network Issues

  • Production Issues

  • Show and Tell

  • CODEC Issues and Requirements

Columbia University Academic Information Systems


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CODEC issues/reqs

  • Why are we using analog audio/video?

  • Audio requires better than CD quality:

    • 6 or more channels (e.g. Dolby 5.1, 7.1).

    • 96 kHz sampling.

  • "Perfect" audio/video synchronization.

  • Better than [email protected] (SDTV)

  • HD 1280p would be nice.

  • Firewire capture instead of analog?

Columbia University Academic Information Systems


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CODEC issues/reqs

  • CODECs have to work with IP networks.

  • QoS-enabled.

  • RTP.

  • Dynamically adjust based on changing conditions.

  • Oh, and, by the way, deliver extremely low latency:-)

Columbia University Academic Information Systems


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DV capture -> MPEG with Linux on a VAIO

http://www.schirmacher.de/arne/dvgrab/

http://linux1394.sourceforge.net/

# modprobe ieee1394

# modprobe ohci1394

# modprobe raw1394

# modprobe sbp2_1394

# rescan-scsi-bus.sh

# mount /dev/sda1 /mnt/disk

# cd /mnt/disk

# dvgrab --autosplit --format dv2 file

Columbia University Academic Information Systems


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DV capture -> MPEG with Linux on a VAIO

$ lav2yuv -I 1 file*.avi | mpeg2enc –o video.mpg

$ lav2wav file*.avi | mp2enc -s -b 384 -r 48000 -o audio.mp3

$ mplex -o final.mpg video.mpg audio.mp3

$ gtv final.mpg

Columbia University Academic Information Systems



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Thanks….

  • Lou Brown & Christianne Orto, Manhattan School of Music

  • Brent Sweeny, Grover Browning, Matt Davies & co., Abilene

  • Marc Boulerice, Jane Hermanson, Thomas Tam, CANARIE

  • Brian Shepard, Oklahoma University

  • Bill Owens, NYSERnet

Columbia University Academic Information Systems


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Performance Copyright (p) 2000 Pinchas Zukerman, Manhattan School of Music, National Arts Centre of [email protected]

Columbia University Academic Information Systems


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