title: DVB PCR error time period
body: <p><strong><em>The main question is what the time for PCR error in DVB streaming ?</em></strong></p>
  
  <p>I am asking it because according to DVB standards (see additional information)
  PCR error retention period > 100 ms.
  But there is a lot of hardware which is logging PCR errors with PCR ~50 ms.</p>
  
  <p><strong>Aditional information</strong></p>
  
  <p><strong><em>You can skip it, if you already know the answer, this information presents just as additional info about standards that I was found</em></strong></p>
  
  <hr>
  
  <p>ETSI TR 101 290 V1.2.1 (2001-05) - aka true DVB
  <a href="http://www.etsi.org/deliver/etsi_tr/101200_101299/101290/01.02.01_60/tr_101290v010201p.pdf" rel="nofollow noreferrer">http://www.etsi.org/deliver/etsi_tr/101200_101299/101290/01.02.01_60/tr_101290v010201p.pdf</a></p>
  
  <p>A PCR _accuracy_error occurs when a transmitted PCR value differs from what is expected by more >than 500 nanoseconds. The expected PCR value is calculated using an extremely stable internal clock >n the test device and previous PCR values. The calculated PCR is then compared to the transmitted >PCR values to check for accuracy. It is important to note that most receivers do not contain very >accurate clocks and therefore can be severely affected by this error.</p>
  
  <p>ETSI TS 101 154 V1.9.1 (2009-09)
  <a href="http://www.etsi.org/deliver/etsi_ts/101100_101199/101154/01.09.01_60/ts_101154v010901p.pdf" rel="nofollow noreferrer">http://www.etsi.org/deliver/etsi_ts/101100_101199/101154/01.09.01_60/ts_101154v010901p.pdf</a></p>
  
  <p>Program Clock Reference (PCR)
  Encoding: The time interval between two consecutive PCR values of the same program shall not >exceed
  100 ms as specified in clause 2.7.2 of ITU-T Recommendation H.222.0 / ISO/IEC 13818-1 [1].
  Decoding: The IRD shall operate correctly with PCRs for a program arriving at intervals not exceeding
  100 ms</p>
  
  <p>ISO/IEC 13818-1 (Information technology — Generic coding
  of moving pictures and associated audio
  information: Systems)
  <a href="https://forums.xilinx.com/xlnx/attachments/xlnx/DSPTOOL/15095/1/iso13818-1.pdf" rel="nofollow noreferrer">https://forums.xilinx.com/xlnx/attachments/xlnx/DSPTOOL/15095/1/iso13818-1.pdf</a></p>
  
  <hr>
  
  <p>Thank you.</p>