Re: MPEG 2 Video Decoding

[Herbert Grabmayer <Herbert.Grabmayer () schoeller at>]

Thanks Frank, 

the hint brings me on the right way. I played now with VLC player. But when i open the pcap file it begins playing but 
the quality was horrible. So i tried others. I configured VLC to listen on the udp multicast address and port. But in 
this configuration i needed a replay software for the pcap file. i found colasoft packet player. Now i have configured 
in the Host (MAC OSX) the VLC player. In a VMWare with windows 7 i installed the colasoft packet player and replay the 
pcap with the video as captured on different points ind the network. With some reference videos where i know that there 
are no problems in, i see that my analyzing setup have no influence in the quality of the video.

regards
Herbert

Am 17.08.2011 um 22:33 schrieb Frank Bulk:

> Have you looked at VLC?
>
> Frank
>
> -----Original Message-----
> From: wireshark-users-bounces () wireshark org
> [mailto:wireshark-users-bounces () wireshark org] On Behalf Of Herbert
> Grabmayer
> Sent: Wednesday, August 17, 2011 4:06 AM
> To: wireshark-users () wireshark org
> Subject: [Wireshark-users] MPEG 2 Video Decoding
>
> Hello to all!
>
> First a little introduction of myself. I am working the past ten years in
> the network and application performance troubleshooting and using various
> tools for my work. i have some knowledge in TCP and use Wireshark for
> analysis since some years.
>
> Now i am analyzing a video stream that a have recorded with an shark
> appliance. Analyzing parts of this stream where i found some anomalies with
> the pilot console with the Wireshark show me the packets decoded as ISO/IEC
> 13818-1 and when i have packet loss i get a indication in the Wireshark
> expert. When i save the payload as avi file and run it with windows media
> player i see clearly if the packet loss affects the video quality. 
>
> But i have there a other anomaly seen. the stream is variable bit-rate with
> around 11 Mbit/s. normally there are little variations around 10 to  12
> Mbit/s when i show the packets with IO Graph with 0,01 second granularity.
> but some times it goes down to nearly zero for 10 ms. When i look at the
> trace i see normally 2 to 3 packets per second running but sometimes i see
> for 10 milliseconds nothing. Now i need a tool to make this behavior visible
> in a video playback. When i save only the payload than i loos the timing
> information and a can only detect the behavior of packet loss. So i need a
> tool where i can read the pcap trace with udp/ISO/IEC -13818-1 frame and
> replay it without loos of the timing information so i can see if this 10 ms
> gaps affect the video quality. 
>
> Someone know an open-source or commercial tool that can read and replay
> video over ethernet frames?
>
> thanks in advance
> Herbert
>
>
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