We are having trouble decoding video from an Axis Q7606 blade H.264 encoder. After running for about an hour the video dramatically degrades. The video appears to "melt". Stopping and restarting the video fixes the problem until it happens again. This problem does not seem to happen with VLC or using the Microsoft decoder. One other thing I notice is that, when using ffdshow, my effective frame rate is around 8fps when the actual frame rate is 20fps. Also, when using the Microsoft decoder (that comes with Windows7) the effective frame rate always matches the expected frame rate. The decoded SDP for the video is as follows.
Quote:
v=0
o=- 1326387995092752 1326387995092752 IN IP4 192.168.25.200
s=Media Presentation
e=NONE
c=IN IP4 0.0.0.0
b=AS:50000
t=0 0
a=control:rtsp://192.168.25.200/axis-media/media.amp?videocodec=h264
a=range:npt=0.000000-
m=video 0 RTP/AVP 96
b=AS:50000
a=framerate:20.0
a=transform:1,0,0;0,1,0;0,0,1
a=control:rtsp://192.168.25.200/axis-media/media.amp/trackID=1?videocodec=h264
a=rtpmap:96 H264/90000
a=fmtp:96 packetization-mode=1; profile-level-id=420029; sprop-parameter-sets=Z0IAKeKQFge2BqwYBBuHiRFQ,aM48gA==
H264, subtype switch set: 1
profile_idc: 66
const_set0: 0
const_set1: 0
const_set2: 0
level_idc: 41
sps_id: 0
log2maxFrame: 0
pic_order_cnt_type: 0
log2_pic_max_order_cnt: 9
num_ref_frames: 1
gaps_in_frame_num_allowed: 0
pic_width_in_mbs: 43 (704)
pic_height_in_mbs: 29 (480)
frame_mbs_only_flag: 1
direct_8x8_inference_flag: 1
frame_cropping_flag: 0
vui_parameter_present: 0
|
Any ideas what may be going wrong? Could there be some configuration setting that needs to be changed? Any ideas of how to further debug this issue? Thanks, David