After decoding on another PC(192.168.1.100), I can see the delay 2 seconds more. There is no exact calculation. The decoding module is also ffmpeg library. I found out ffmpeg encoder does not return output data even though vfw capture data exist. After ffmpeg encoder is received more than 40 frames, the encoder returns output data. BTW, I added cqp option and then the ffmpeg encoder returns output data promptly. -----Original Message----- From: "NEERAJ SHUKLA"<[email protected]> To: "This list is about using libavcodec, libavformat, libavutil, libavdevice and libavfilter."<[email protected]> Cc: Sent: 11-09-10(토) 02:14:35 Subject: Re: [Libav-user] Encoding packetization speed 2011/8/31 김희숙 <[email protected]> Hi All, I'm testing FFMPEG performance with libx264 for H.264 encoding. I found there may 2 or 3 seconds delay on receiving PC. The command is as follows: ffmpeg -r 30 -f vfwcap -s 1280x720 -i 0 -vcodec libx264 -b 2000k -minrate 1000k -coder 0 -flags +loop+cgop -cmp +chroma -partitions -parti8x8+parti4x4+partp8x8-partp4x4-partb8x8 -me_method dia -subq 3 -me_range 24 -g 250 -keyint_min 25 -sc_threshold 40 -i_qfactor 0.71 -b_strategy 1 -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -directpred 1 -flags2 +fastpskip -refs 6 -subq 5 -f rtp rtp://192.168.1.100:40000 I also tested cif resolution and I got same result, 2 or 3 seconds delay. I captured the rtp packets and I found there is no many packets to be sent on receiving side. In general, how many packets to be sent under 1280x720@30fps? the decoding picture quality was good but there was delay. I wonder there is missing point on above command or something. Please advise something to me. Thanks hsk _______________________________________________ Libav-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/libav-user HOW ARE YOU CALCULATING THE DELAY ?? PLEASE SPECIFY ELABORATELY
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