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MediaPortal 1
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Video & Audio Stuttering for short period of time for LiveTV only after S3 or S5
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<blockquote data-quote="CyberSimian" data-source="post: 1142366" data-attributes="member: 141969"><p>I thought that I would add this update for anyone else who is curious about the way that the EPG operates and who has been following this thread.</p><p></p><p>Today I switched off the TV and expected the HTPC to run for circa 7 minutes (it was overdue for an EPG grab), and then hibernate. Instead it ran for 30 minutes <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek! :eek:" loading="lazy" data-shortname=":eek:" />, and then hibernated. Looking at the TV Server log showed that the EPG grab had occurred for the full 30 minutes from a single channel and then timed out -- the smart limiter never operated.</p><p></p><p>Although I have only three examples, I am beginning to wonder whether the <em>ordering</em> of the transmitted EPG in the UK varies between daytime and nighttime:</p><p></p><p>(1) During the day, the ordering of the EPG is optimised for the large number of TV sets that do not retain the EPG when in standby, and so gives preference to EPG entries for today and for the next 2-3 days, and reduces the occurrence of EPG entries for days that are 7 days in the future. These "distant" EPG entries are not absent, but they occur so infrequently in the datastream that from the point of view of the EPG grabber, the EPG never stops changing (even after 30 minutes!), and so the grabber eventually times out.</p><p></p><p>(2) During the night, the ordering of the EPG is optimised for DVRs that wake up during the night to grab the EPG, and so there is a more uniform distribution of EPG entries for different days, allowing the entire EPG to be grabbed within 7 minutes (in the UK).</p><p></p><p>That is all speculation, of course. However, the reason for doing a frequent EPG grab (whether using the idle grabber or the timeshift grabber) is to receive last-minute EPG changes for programmes that are broadcast later the same day. A short grab would be sufficient to receive these last-minute changes. In the UK, a 30-minute grab serves no purpose, so I shall revert to the default idle grab of 10 minutes. So it seems (cough) that MP had it right all along. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p><p></p><p>-- from CyberSimian in the UK</p></blockquote><p></p>
[QUOTE="CyberSimian, post: 1142366, member: 141969"] I thought that I would add this update for anyone else who is curious about the way that the EPG operates and who has been following this thread. Today I switched off the TV and expected the HTPC to run for circa 7 minutes (it was overdue for an EPG grab), and then hibernate. Instead it ran for 30 minutes :eek:, and then hibernated. Looking at the TV Server log showed that the EPG grab had occurred for the full 30 minutes from a single channel and then timed out -- the smart limiter never operated. Although I have only three examples, I am beginning to wonder whether the [i]ordering[/i] of the transmitted EPG in the UK varies between daytime and nighttime: (1) During the day, the ordering of the EPG is optimised for the large number of TV sets that do not retain the EPG when in standby, and so gives preference to EPG entries for today and for the next 2-3 days, and reduces the occurrence of EPG entries for days that are 7 days in the future. These "distant" EPG entries are not absent, but they occur so infrequently in the datastream that from the point of view of the EPG grabber, the EPG never stops changing (even after 30 minutes!), and so the grabber eventually times out. (2) During the night, the ordering of the EPG is optimised for DVRs that wake up during the night to grab the EPG, and so there is a more uniform distribution of EPG entries for different days, allowing the entire EPG to be grabbed within 7 minutes (in the UK). That is all speculation, of course. However, the reason for doing a frequent EPG grab (whether using the idle grabber or the timeshift grabber) is to receive last-minute EPG changes for programmes that are broadcast later the same day. A short grab would be sufficient to receive these last-minute changes. In the UK, a 30-minute grab serves no purpose, so I shall revert to the default idle grab of 10 minutes. So it seems (cough) that MP had it right all along. :D -- from CyberSimian in the UK [/QUOTE]
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