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Re: [Linphone-users] NEWSLETTER Re: BUGS: H.264 stream probably invalid
Petr Macháček - 2N
Re: [Linphone-users] NEWSLETTER Re: BUGS: H.264 stream probably invalid + crash
Thu, 4 Nov 2021 15:57:22 +0000
Ok, I have just re-sent it to developers.
From: Linphone-users <firstname.lastname@example.org> On
Behalf Of David Emanuel da Costa Santiago
Sent: Thursday, November 4, 2021 4:32 PM
Subject: NEWSLETTER Re: [Linphone-users] BUGS: H.264 stream probably invalid +
I believe this would be better discussed in the developers mailing list:
Às 10:10 de 04/11/21, Petr Macháček - 2N escreveu:
> Hello Linphone developers,
> I'm testing some piece of my software with Linphone. When I make a
> call from Linphone to my software, the video from Linphone has bad
> quality, it contains artifacts that are typical for H.264. Using
> WireShark, I saved the stream from Linphone to pcap format and
> extracted the H264 stream from that. I then analyzed this stream with
> the H.264 Stream Analysis program
> This program shows that the H264 stream from Linphone is very strange.
> It contains several I-frames at the beginning followed by a long
> series of P-frames. Normally it is typical for I-frames to be many
> times larger than P-frames, but from Linphone both I-frames and
> P-frames are similarly large (~1kB).
> I note that Linphone is the only software that my program has a
> problem with. I've tested it with a number of other devices (e.g.
> GrandStream GXV3275, various IP cameras...) and I haven't had a
> problem with H.264 video anywhere.
> I am attaching a screenshot of the H.264 Stream Analysis program with
> the stream from the Linphone (linphone.png) and another screenshot
> with the stream from the IP camera where the stream is not corrupted
> I am also sending a link to a zip file that contains both a pcap dump
> from Wireshark that contains the Linphone stream and the extracted
> h264 stream from Linphone:
> Another problem a Linphone crash:
> When I call from Linphone to GrandStream GXV3275, Linphone asks
> whether I want to turn on video. I click Confirm and the Linphone crashes.
> Linphone: Desktop 4.3.0, Core 5.0.39.
> OS: Windows 10 Pro (21H1, build 19043.1288)
> PC: Notebook Dell Latitude 5491
> Best regards
> Petr Machacek
> Linphone-users mailing list
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