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Enhanced Multimedia Packet Loss Handling Techniques for Optimal User Experience

This informative guide delves into advanced methods for mitigating packet loss in multimedia applications, covering sender-based repair, retransmission strategies, error concealment techniques, and interactive modes to ensure seamless playback and delivery of multimedia content. Learn how to optimize media transmission across various network conditions.

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Enhanced Multimedia Packet Loss Handling Techniques for Optimal User Experience

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  1. Methods of Handling Packet Loss for Multimedia Applications by Hansen Bow

  2. Contents • Introduction • Sender Methods • Receiver Methods • Interactive Methods

  3. Introduction • Channels can introduce bit and erasure errors • Variable length coding can be desynchronized • MPEG-2 • 15 pictures in GoP • loss in one frame messes up rest of frames in group • cannot really use TCP protocol because results in sawtooth patterns in transmission rate

  4. Sender-Based Repair • Forward Error Correction • Interleaving • Retransmission

  5. Forward Error Correction • Media independent • block or algebraic codes • Media dependent • primary and secondary encoding • multiple description coding • joint source and channel coding • robust waveform and entropy coding • Congestion Control • layered encoding sent to different groups

  6. Interleaving • Prerequisite: • Unit size smaller than packet size • Units interleaved at encoder and returned to order at decoder • Disperses effect of packet losses

  7. Retransmission • only host closest to failure issues request • subsidiaries repress request to avoid implosion

  8. Error Concealment • Insertion-based repair • Interpolation-based repair • Regeneration-based repair

  9. Insertion-based repair • Splicing together of streams • Silence substitutions • Noise substitution • Repetition

  10. Interpolation-based repair • Account for changing characteristics of signal • Motion-compensated temporal prediction • maximally smooth recovery • Time scale modification

  11. Regeneration-based repair • Based on compression algorithm • one way: DC and lowest five AC coefficients estimated from top and bottom of neighboring blocks – rest forced to zero

  12. Interactive modes • Adjusting transmission rate according to feedback information • withdraw congestion before packet loss • Selective encoding • tell encoder locations of damaged parts • encoder adapts encoding strategy to match with prediction • Retransmission without waiting • interpolation at decoder during retransmission • reverse calculate what current scene is when encoder information arrives

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