[Live-devel] MP4 Video Startup Issue

[Bill Barnett]

Thanks Ross, this brings up several questions (since I am mainly integrating this into a product as opposed to being an expert).

- Wouldn't we see this problem on all 30 seconds videos, not just starting at file 8 and above (very reproducible)?
- What is the typical frame rate vs I-frame interval that most people use (if there is a "typical")?
- Is there any way to get openRTSP to spit out additional debug data during operation - I did not see this in the docs?
- Is see various mp4 inspectors, is there one that you would recommend that might specifically point to a particular problem?

Thanks much, Bill


-----Original Message-----
From: live-devel [mailto:live-devel-bounces at ns.live555.com] On Behalf Of Ross Finlayson
Sent: Thursday, August 23, 2018 3:44 PM
To: LIVE555 Streaming Media - development & use <live-devel at ns.live555.com>
Subject: Re: [Live-devel] MP4 Video Startup Issue

The problem here is probably that the stream from your camera is not including I-frames (i.e., ‘key’ frames, consisting of complete pictures) often enough.  The captured MP4 file won’t be able to show anything until it sees the first (complete) I-frame.

So, I suggest decreasing the “I-frame interval” in each stream that you want to capture.

Another thing to keep in mind is that these streams will be very sensitive to network packet loss.  Each I-frame will take up many RTP packets, and if even one of these RTP packets gets lost on the network, the whole I-frame will be unusable.  So, you might also want to play around with decreasing your stream’s bit rate.


Ross Finlayson
Live Networks, Inc.
http://www.live555.com/


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