How low the frame rate can DM365(8) H264 encoder support? Is there any restriction ?
We had appro IPNC based camera system (dvsdk 2.10.1.18) with DM365(8) processor. What we found out the H264 encoder started to have problem when the frame rate drops to 5fps. While in 5fps, we set the GOV to 20 (which means every 4 seconds there is an I-frame). But when we use ffprobe to check the recorded file, it printed out "Missing reference picture". When the frame rate is 6fps, we do not see the problem.
byu@ubuntu:~$ ffprobe -show_frames -pretty ipcam_20140618183847.avi|grep 'size\|pict_type\|coded_picture_number' > iframe.txt
FFprobe version SVN-r20090707, Copyright (c) 2007-2009 Stefano Sabatini
libavutil 49.15. 0 / 49.15. 0
libavcodec 52.20. 0 / 52.20. 1
libavformat 52.31. 0 / 52.31. 0
built on Jan 19 2010 21:59:04, gcc: 4.4.3 20100116 (prerelease)
Input #0, avi, from 'ipcam_20140618183847.avi':
Duration: 00:01:00.60, start: 0.000000, bitrate: 1749 kb/s
Stream #0.0: Video: h264, yuv420p, 320x240, 5 tbr, 5 tbn, 10 tbc
[h264 @ 0x9dc2ae0]error while decoding MB 13 13, bytestream (-82)
[h264 @ 0x9dc2ae0]non-existing PPS referenced
[h264 @ 0x9dc2ae0]decode_slice_header error
[h264 @ 0x9dc2ae0]non-existing PPS referenced
[h264 @ 0x9dc2ae0]decode_slice_header error
[h264 @ 0x9dc2ae0]non-existing PPS referenced
[h264 @ 0x9dc2ae0]decode_slice_header error
[h264 @ 0x9dc2ae0]concealing 76 DC, 76 AC, 76 MV errors
[h264 @ 0x9dc2ae0]Missing reference picture
[h264 @ 0x9dc2ae0]left block unavailable for requested intra mode at 0 14
[h264 @ 0x9dc2ae0]error while decoding MB 0 14, bytestream (135)
[h264 @ 0x9dc2ae0]non-existing PPS referenced
[h264 @ 0x9dc2ae0]decode_slice_header error
[h264 @ 0x9dc2ae0]non-existing PPS referenced
[h264 @ 0x9dc2ae0]decode_slice_header error
[h264 @ 0x9dc2ae0]non-existing PPS referenced
[h264 @ 0x9dc2ae0]decode_slice_header error
[h264 @ 0x9dc2ae0]concealing 69 DC, 69 AC, 69 MV errors
[h264 @ 0x9dc2ae0]Missing reference picture
[h264 @ 0x9dc2ae0]error while decoding MB 0 14, bytestream (-15)
[h264 @ 0x9dc2ae0]non-existing PPS referenced
[h264 @ 0x9dc2ae0]decode_slice_header error
[h264 @ 0x9dc2ae0]non-existing PPS referenced
[h264 @ 0x9dc2ae0]decode_slice_header error
[h264 @ 0x9dc2ae0]non-existing PPS referenced
[h264 @ 0x9dc2ae0]decode_slice_header error
[h264 @ 0x9dc2ae0]concealing 69 DC, 69 AC, 69 MV errors
[h264 @ 0x9dc2ae0]Missing reference picture
[h264 @ 0x9dc2ae0]left block unavailable for requested intra mode at 0 14
[h264 @ 0x9dc2ae0]error while decoding MB 0 14, bytestream (147)
[h264 @ 0x9dc2ae0]non-existing PPS referenced
[h264 @ 0x9dc2ae0]decode_slice_header error
[h264 @ 0x9dc2ae0]non-existing PPS referenced
[h264 @ 0x9dc2ae0]decode_slice_header error
[h264 @ 0x9dc2ae0]non-existing PPS referenced
[h264 @ 0x9dc2ae0]decode_slice_header error
[h264 @ 0x9dc2ae0]concealing 69 DC, 69 AC, 69 MV errors
[h264 @ 0x9dc2ae0]Missing reference picture
[h264 @ 0x9dc2ae0]error while decoding MB 0 14, bytestream (-69)
[h264 @ 0x9dc2ae0]non-existing PPS referenced
[h264 @ 0x9dc2ae0]decode_slice_header error
[h264 @ 0x9dc2ae0]non-existing PPS referenced
[h264 @ 0x9dc2ae0]decode_slice_header error
[h264 @ 0x9dc2ae0]non-existing PPS referenced
[h264 @ 0x9dc2ae0]decode_slice_header error
[h264 @ 0x9dc2ae0]concealing 69 DC, 69 AC, 69 MV errors
[h264 @ 0x9dc2ae0]Missing reference picture
[h264 @ 0x9dc2ae0]error while decoding MB 0 14, bytestream (-73)
[h264 @ 0x9dc2ae0]non-existing PPS referenced
[h264 @ 0x9dc2ae0]decode_slice_header error
[h264 @ 0x9dc2ae0]non-existing PPS referenced
[h264 @ 0x9dc2ae0]decode_slice_header error
[h264 @ 0x9dc2ae0]non-existing PPS referenced
[h264 @ 0x9dc2ae0]decode_slice_header error
[h264 @ 0x9dc2ae0]concealing 69 DC, 69 AC, 69 MV errors
[h264 @ 0x9dc2ae0]Missing reference picture
[h264 @ 0x9dc2ae0]error while decoding MB 0 14, bytestream (-67)
