[M4IF Technotes] Reference software Error Resilient

[Joao Tavares]

Dear Chang:
Error concealment is implementation specific, although ISO MPEG-4 supports it. For instance, Synchronization Markers, Data Partitioning, RVLC and HEC field allow for error concealment mechanisms to be implemented in the decoder. Microsoft MPEG-4 Visual reference software does not have error concealment functions implement but MoMuSys does. MoMuSys software can't also decode bitstreams with errors. Important checks for error detection are missing in both the software packages.
_______________________________
  Joao Tavares
  IT -  Instituto das Telecomunicacoes
  Universidade de Aveiro
  Campus Universitario de Santiago
  3810-193 AVEIRO - PORTUGAL
  Tel +351 234 377900
  Fax +351 234 377901
________________________________
  ----- Original Message ----- 
  From: Chang Yoong Choon 
  To: technotes   lists.m4if.org 
  Sent: Friday, December 21, 2023 1:25 AM
  Subject: [M4IF Technotes] Reference software Error Resilient
  Dear All:
  I am using Microsoft ISO MPEG-4 reference software. Whenever I try to decode MPEG-4 bitstream with errors, the decoder will crash or stop decoding. According to ISO MPEG-4 reference software manual, the current decoder supports error resilient bitstream but does not have error recovery, error detection, error concealment functions. In other words, whenever the decoder encounter bitstream error during decoding process, it will stop decoding.
  Where can I find MPEG-4 decoder that support error resilient and have error detection, error detection, error recovery, error concealment functions?
  How can I modify the Microsoft MPEG-4 refernece software so that it can decode bitstream with errors? Which file in the source code should I modify?
  Does MoMuSys MPEG-4 reference software decoder support error resilient functions? Can the decoder decode MPEG-4 bitstream with errors?
  Many thanks for your help.
  regards
  Yoong-Choon Chang
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