Hello, I am trying to receive a live h.264 multicast stream. I can view it with VLC, but FFMPEG or my own libav-based applciation take minutes before they can figure out what to do with the stream. I am trying to figure out what is different about VLC and my application.
The video comes from cameras connected to a Mango DSP-based server which uses VLC and some other processing to stream the packets. I can see other live h.264 multicast streams fine with FFMPEG and my application, but they are not being streamed with this server setup. The vlc command line is: vlc 'rtsp://10.10.32.200/?multicast/h264?cam=0' This Mango server then converts those packets to the multicast address 232.0.0.11:7170. (I'm not exactly sure how or what else it does.) When I try to grab the stream with FFMPEG, I see h264-related error messages right away (log linked below). Then, after a long wait (sometimes about 5-10 minutes), I see the output messages from libavformat where it has detected some of the stream parameters such as the screen resolution and time base information. Now, I have actually a seen a couple times where after more waiting it starts to generate frames. Here is an example of an FFMPEG command line I have used: > ffmpeg -i imPath0.sdp -y out.mp4 Here is the snippet of code that calls libav*. It's pretty standard: http://davehenning.com/pages/code_snippet.c Here is the complete console log of a trial from my laptop: http://davehenning.com/pages/impath_console_log.txt Here is the SDP file that I used to actually generate a frame: http://davehenning.com/pages/imPath0.sdp I have also used this SDP file, which is generated by the server, but that hasn't worked yet: http://davehenning.com/pages/stream.sdp Can anyone give me a hint on what I might need to do when invoke ffmpeg/libav* in order to see the video consistently and in a reasonable amount of time? Does anyone have an idea why VLC sees it no problem every time? Thanks, Dave ... _______________________________________________ libav-user mailing list [email protected] https://lists.mplayerhq.hu/mailman/listinfo/libav-user
