> On Wednesday, 26 September 2018, 8:38:09 pm AWST, PaulYurt > <[email protected]> wrote:> > Are you certain the. camera output is > interlaced? HD720 is typically progressive. > > If you decode progressive as > interlaced you would get two very similar images. I believe it is. The documentation for camera states it sends PAL interlaced encoded using ITU-R BT.601 and ITU-R BT.656, using RFC 4175 RTP packets. I tried capturing the RTP traffic over the network using Wireshark and examing it.The headers in the RTP look like they do conform to RFC 4175. A sample of the capture is at https://www.dropbox.com/s/l65o879qf2er3qi/camera_5.pcapng?dl=0. > Paul Yurt> > On Sep 26, 2018, at 8:15 AM, [email protected] <[email protected]> wrote:>> >> Hi, >> >> I am unable to get ffplay to play back a raw uncompressed interlaced>> video from an RTP stream, coming from a camera feed. The camera>> broadcasts the SDP using SAP, which I have been able to extract into>> a local file. The contents of the SDP:>> >> v=0>> o=- 340496 340496 IN IP4 192.168.204.40>> s=Camera 2>> c=IN IP4 239.192.1.40/15>> t=0 0>> m=video 5004 RTP/AVP 97>> a=rtpmap:97 raw/90000>> a=fmtp:97 sampling=YCbCr-4:2:2; width=720; height=576; depth=8; colorimetry=BT601-5; interlace>> a=framerate:25>> >> I am using the following command to play it back with ffplay:>> >> ffplay -protocol_whitelist file,rtp,udp -strict -2 -f sdp \>> camera2.sdp>> >> This resulting image showed two almost identical images laid out>> vertically. In order to show the results I am getting, I have also>> recorded a small sample with the following:>> >> ffmpeg -protocol_whitelist file,rtp,udp -strict -2 -f sdp -i \>> camera2.sdp -t 5 -vf "scale=240x192,idet" camera2_sample.mp4>> >> Note that I applied the scaling only to keep the file size small - the>> resulting mp4 file is close to what I was seeing in ffplay. The file >> has been uploaded to my Dropbox at:>> >> https://www.dropbox.com/s/6kgfsie7rgfnoe7/camera2_sample.mp4?dl=0>> >> The tail end of the output from FFmpeg at the end of the recording, >> including the output from idet:>> >> video:171kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 2.121141%>> [Parsed_idet_1 @ 000001d6ff69f4c0] Repeated Fields: Neither: 217 Top: 0 Bottom: 0>> [Parsed_idet_1 @ 000001d6ff69f4c0] Single frame detection: TFF: 0 BFF: 0 Progressive: 217 Undetermined: 0>> [Parsed_idet_1 @ 000001d6ff69f4c0] Multi frame detection: TFF: 0 BFF: 0 Progressive: 217 Undetermined: 0>> [libx264 @ 000001d680000500] frame I:2 Avg QP:18.69 size: 1068>> [libx264 @ 000001d680000500] frame P:127 Avg QP:28.83 size: 750>> [libx264 @ 000001d680000500] frame B:121 Avg QP:30.57 size: 638>> [libx264 @ 000001d680000500] consecutive B-frames: 10.0% 76.0% 1.2% 12.8%>> [libx264 @ 000001d680000500] mb I I16..4: 77.2% 1.7% 21.1%>> [libx264 @ 000001d680000500] mb P I16..4: 2.6% 6.1% 2.8% P16..4: 13.2% 6.0% 2.8% 0.0% 0.0% skip:66.5%>> [libx264 @ 000001d680000500] mb B I16..4: 28.9% 2.5% 4.3% B16..8: 7.2% 2.6% 0.6% direct: 1.6% skip:52.3% L0:22.3% L1:76.0% BI: 1.7%>> [libx264 @ 000001d680000500] 8x8 transform intra:18.1% inter:34.7%>> [libx264 @ 000001d680000500] coded y,uvDC,uvAC intra: 18.1% 21.9% 11.9% inter: 8.7% 10.7% 2.7%>> [libx264 @ 000001d680000500] i16 v,h,dc,p: 69% 29% 1% 0%>> [libx264 @ 000001d680000500] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 1% 29% 67% 0% 1% 1% 1% 0% 1%>> [libx264 @ 000001d680000500] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 7% 46% 21% 4% 4% 3% 5% 3% 5%>> [libx264 @ 000001d680000500] i8c dc,h,v,p: 66% 31% 1% 1%>> [libx264 @ 000001d680000500] Weighted P-Frames: Y:0.0% UV:0.0%>> [libx264 @ 000001d680000500] ref P L0: 45.1% 14.7% 31.6% 8.6%>> [libx264 @ 000001d680000500] ref B L0: 57.7% 42.3%>> [libx264 @ 000001d680000500] kb/s:279.35>> >> I was suspecting that FFmpeg was not treating the interlacing >> correctly. Is there an option that I should be specifying? I have >> tried playing back with the yadif and tinterlace with similar >> results. The commands I used were:>> >> ffplay -protocol_whitelist file,rtp,udp -strict -2 -vf yadif=mode=1 \>> -f sdp camera2.sdp>> >> and>> >> ffplay -protocol_whitelist file,rtp,udp -strict -2 -vf tinterlace=6 \>> -f sdp camera.sdp>> _______________________________________________>> ffmpeg-user mailing list>> [email protected]>> http://ffmpeg.org/mailman/listinfo/ffmpeg-user>> >> To unsubscribe, visit link above, or email>> [email protected] with subject "unsubscribe".>> _______________________________________________>> ffmpeg-user mailing list>> [email protected]>> http://ffmpeg.org/mailman/listinfo/ffmpeg-user>> >> To unsubscribe, visit link above, or email>> [email protected] with subject "unsubscribe".
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