Hello.
After performing some changes in my code, I could get the h264 parser to
start saying additional errors for I-Frames.
From my perspective, errors I am facing are the same as those ones that
I obtain when I try to play the stream dumped in a file with mplayer:
[h264 @ 0x8a0db00]non-existing PPS 0 referenced
[h264 @ 0x8a0db00]decode_slice_header error
[h264 @ 0x8a0db00]no frame!
However, the well news are the next: if I use "mplayer" indicating fps,
then I can play the stream:
mplayer -fps 30 stream.h264
So, my question is, ¿How can I specify the fps (extracted via SDP) to
avcodec / h264 decoder in the code?
Thanks a lot for your help.
Sergio
Sergio Arroutbi escribió:
Hello.
I am trying to decode images coming from a H264 Axis camera.
This camera is sending H.264 stream based on some information provided
in SDP (sent via 200 Ok responses to RTSP DESCRIBE messages).
After sending RTSP requests, I start receiving the stream.
Once the stream is received, I dont know how to parse the RTP messages
in order to be able to decode the
What i have is basically a socket that reads the RTP packets, get RTP
payload and calls:
avcodec_decode_video(*context, *decoded_image, &got_picture, frame,
frame_size)), where "frame" and "frame_size" are the RTP payload and RTP
payload length. I continously get the error:
[h264 @ 0x99b7a20]no frame!
After investigating the issue, I guess that I have to parse RTP payload
in order to get "raw H264 frames". I discovered RFC3984 (that talks
about this topic), but I believe ffmpeg library does already perform
"RFC3984 performance", as it has some methods to parse the sdp, RTP, etc.
Which is the best method to decode the frames by calling
avcodec_decode_video?
I guess I have to pass SDP information to AVContext*, but do not know
how to do so.
Anyone could perform decoding of frames in a H.264 stream encapsulated
in RTP?
Which is the best method to use?
Thanks a lot.
Sergio.
--
Sergio Arroutbi Braojos
Ingeniero de Desarrollo Software
Grupo GMIS
SEPSA
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