Subscriber Discussion

Zipstream May Not Be So Zippy On Playback...

U
Undisclosed #1
•Jun 07, 2016
IPVMU Certified

Came across this Axis deck on zipstream that contained this panel:

maybe just axis being conservative...

Has anyone tried high-speed scrubbing back and forth on an aggressively GOP compressed zipstream?

4x may seem fast enough, but as I found out after purchasing an NVR that maxed out at 4x, it can be supremely irritating if you have a lot of ground to cover. Ditto with latent scrubbing back and forth.

Not mentioned but worth investigating is possible issues with multi-window jumbo GOP playback.

Anybody seen anything one way or another?

(1)
JH
John Honovich
•Jun 07, 2016
IPVM

Ethan, test this. Let us know.

UM
Undisclosed Manufacturer #2
•Jun 08, 2016

Very similar to when h264 came out, freezer and rewarding was I frame only.

Need to buffer the video and/or decode p frames...

(1)
U
Undisclosed #1
•Jun 08, 2016
IPVMU Certified
In reply to Undisclosed Manufacturer #2

...freezer and rewarding was I frame only

assuming you mean fast-freezer? :)

(1)
UM
Undisclosed Manufacturer #2
•Jun 08, 2016
In reply to Undisclosed #1

Doh! Yeah, auto correct kicked in and I didn't notice it. Thanks.

That should have been "fast-forwarding and rewinding was I-Frame only".

I know one manufacturer added a "smooth playback" option which buffered the video to allow FF/Rew playback that included P-frames, but it was a hidden menu that most end users or SI would never know about...

Avatar
Ethan Ace
•Jun 08, 2016

I have no issues playing a Zipstream camera back at even 64x in Exacq. I'll grab some samples and drop them here.

Granted, Exacq buffers things prior to playback, but so do most, I believe.

U
Undisclosed #1
•Jun 08, 2016
IPVMU Certified
In reply to Ethan Ace

Cool!

When you say samples do you mean the raw zipstream video file, or a video of the playback?

It would be great to get a raw h.264 file with GOP stretching intact for those of us who are ARPTECally challenged, though I'm not sure that possible.

U
Undisclosed #3
•Jun 08, 2016
In reply to Ethan Ace

Ethan,

What about reverse playback? UD2M mentions freeze frame and rewinding (I'm fluent in spellcheckese) - from my experience, the 'I-frame only' limitations are in reverse playback - not in forward (any speed) playback.

Am I wrong?

Avatar
Matthew Netardus
•Jun 20, 2016
IPVMU Certified

Is that maybe just a disclaimer for their Companion software rather then most VMS'?

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