On Sat, 29 Jan 2005 12:02:21 -0800, Brad Templeton
<[EMAIL PROTECTED]> wrote:
>
> What we care about is the following though:
>
> a) Is there enough spare capacity so that when minor system tasks
> take place, they don't make video skip.
>
> b) Is there enough capacity to do that if you also throw in a niced
> thread to do commercial elimination or transcode?
>
> c) Do we have enough capacity to handle "peak" decoding load, since
> that varies with scene complexity.
>
> And also
>
> d) What's the cheapest processor we can get away with and still play
> skip-free 1080i and 720p?
>
Is it possible for someone who understands the issues around "peak"
decoding load (scene complexity / changes) to either create a
"benchmark" video(s) or at least define what it should contain (think
"test clip" like in Avia or Video Essentials). We could then use that
as a standard for playback during benchmarking.
What would the requirements be?
- Would we need one for 1080i and one for 720p?
- How long should it be to get a good benchmark (duration=1 minute?)?
- Can we then use that (those) videos as a standard for people to test
with in mythtv?
- Is it possible to play a video and get output on how many frames
were dropped (if any)?
- What's a good way to determine cpu "idleness" during the test?
- Ideally we would want to standardize the testing and be able to
provide simple output results (e.g., for such and such a
configuration, running the standard benchmark resulted in x% frames
dropped and average cpu utilization of y%)
- Ideally, we would define a small number of different tests:
1. Play the video through mythtv while mythbackend is idle
2. Play the video through mythtv while mythbackend is recording (1 stream)
3. Play the video through mythtv while mythbackend is recording
and transcoding
Thoughts?
Thanks,
phlepper
--
I hear and I forget. I see and I remember. I do and I understand. -- Confucius
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