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Guest Message by DevFuse

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Please Record "Test Pattern" Tonight


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31 replies to this topic

#26 OFFLINE   Stuart Sweet

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Posted 13 May 2007 - 05:28 PM

I had a little better performance than you, Milo:

Ten 30second slips took 5:40, for an average of 34 seconds per slip, just as you had.

Twenty replays took exactly 120 seconds, for the average of six seconds per slip, just as advertised.

This is an excellent test for all DBSTalkers - well done of course.

At least I never saw :pinkie:
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#27 OFFLINE   Coffey77

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Posted 13 May 2007 - 09:17 PM

I also got the 10 Slips to get to 4:19.
- Andy
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#28 OFFLINE   Steve

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Posted 14 May 2007 - 06:26 AM

This is an excellent test for all DBSTalkers - well done of course.

It's a test, but I'm not sure how valuable it is. As I mentioned in previous post, this is not representative of real worls content. It's MPEG-2 compression of static material. Bound to be consistent.

Real world results with MPEG-4 and moving content are wildly inconsistent.

Speaking for myself, I do not want to give D* the impression that I am pleased with "cruise control" performance. Every time I press FF or Replay, it's a crapshoot as to what's going to happen. /s
/steve

#29 OFFLINE   Coffey77

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Posted 14 May 2007 - 08:24 AM

This test has nothing to do with MPEG4 or 2 performance. This is purely for trickplay features and what they should be. This is a great test for that as the time code on it doesn't vary.
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#30 OFFLINE   Steve

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Posted 14 May 2007 - 08:47 AM

This test has nothing to do with MPEG4 or 2 performance. This is purely for trickplay features and what they should be. This is a great test for that as the time code on it doesn't vary.

Agree, it's what they should be if all we watched were test patterns! I guess that's the point I was trying to get across. I probably didn't make it very well. My bad. /s
/steve

#31 OFFLINE   Coffey77

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Posted 14 May 2007 - 12:49 PM

I guess I'm still not getting what your trying to say. All that is being compared here is the timing of how the Trickplay features work. The only reason we're using this Test Pattern is to see the time stamp on the bottom to see how much time elapses during the tests. Milo is trying gather information outside of his own to prove his theory's are correct and it's not just his box that performs this way.

We are not watching the Test Pattern to discuss the quality of MPEG2/MPEG4. If you're saying that MPEG4 channels operate differently with Trickplay features then please post your findings here and we can start a test on that idea. I sometimes think there is a difference myself. :)
- Andy
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#32 OFFLINE   Steve

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Posted 14 May 2007 - 01:40 PM

I guess I'm still not getting what your trying to say. All that is being compared here is the timing of how the Trickplay features work.[...]

Yup. I'm not at all impugning the validity of Craig's test. All I'm trying to say (and badly, I'm afraid :grin: ) is that the test is only showing how the Trickplay features work for that particular MPEG-2 recording, which I do not believe represents "real world" trick play performance. I'll go out on a limb here and guess that 50% of what users record on their HR20's are MPEG-4 network shows and/or their MPEG-4 RSNs.

If you're saying that MPEG4 channels operate differently with Trickplay features then please post your findings here and we can start a test on that idea. I sometimes think there is a difference myself. :)

Me too. As has been noted by several in various threads (and me in post #5 of this thread), MPEG-4 trick play is very erratic. That's why I asked in this thread's post #20 yesterday morning if someone knew of an MPEG-4 show with an HH:MM second clock that we could all record and run a similar comparison to the HDNet test pattern timing. Doug suggested an NBA game.

My MPEG-4 experience is as follows: 6 second replays sometimes freeze and sometimes do nothing unless clicked more than once. With 0158, sometimes you can stack Replays, and sometimes you can't. 6 presses of 30 second skip will often leave you way short or take you way past a 3 minute block of commercials. I believe it has to do with the Tandberg MPEG-4 encoders that D* uses not creating enough "iframes", which are key frames the HR20 needs to latch onto in order to make trick play work smoothly.

I'm not sure if this is related to the problem as well, but it may be. Unwatched MPEG-4 recordings often aren't cued properly to the start of the recording. Press "play" from the list, and they often start 15 seconds into the recording, and a RW is required to find the true start of the recording. Drives me nuts! :) /s
/steve




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