LOLA (Low Latency audio visual streaming system) A LOW LATENCY, HIGH QUALITY AUDIO/VIDEO TRANSMISSION SYSTEM FOR NETWORK MUSICAL PERFORMANCES AND INTERACTION.

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Presentation transcript:

LOLA (Low Latency audio visual streaming system) A LOW LATENCY, HIGH QUALITY AUDIO/VIDEO TRANSMISSION SYSTEM FOR NETWORK MUSICAL PERFORMANCES AND INTERACTION Speakers Nicola Buso, Carlo Drioli

LOLA (Low Latency audio visual streaming system) Production Conservatorio di musica G. Tartini - Trieste Implementation Paolo Pachini: general coordination Carlo Drioli: programming Nicola Buso: testing and musical advice Claudio Allocchio (Consortium GARR): testing and networking advice Massimo Parovel: conception and supervision

Motivations and Objectives Target applications: interactive musical tasks Network musical performances Network music education and training Challanges Management of synchronous audio video streams over packet networks Minimal delay requirements for interactive task and music performances Optimal balance between AV presentation delay and quality Targets of the project A system suitable for musical performances relying on both aural and visual communication Providing lowest possible delay using available technology Low cost and portable equipment Oriented to dedicated networks (LightNet Project, GARR Consortium)

Functions and networking Connection negotiation and management Send/receive and manage connection requests Negotiation of audio/video formats and compatibility check Video: 640*480, fps, BW/Color Audio: 44100, 16/24 bit, mono/stereo, etc Transmission of raw audio and video streams, monitoring

Grabbing and Tx with low latency devices Video: Grabber BitFlow, BW progressive scan camera Audio: RME HDSP9632 Network: 1GBps Ethernet Card Presentation delays (no Tx): < 5 msec (audio and video) Delays due to Network: from 1 msec (LAN/WAN) to >10-20 msec, depending on the distance On actual networks, jitter buffers are required (delay vs quality balance) At present, tests are ongoing on dedicated GARR network setups Functions and networking Audio/Video data grabbing and transmission

GUI functions Controls for connection negotiation and management Audio/Video buffering controls Visualization options, audio mixer, etc Recording Functions and networking Graphical user interface