How can I mux (or encapsulate) H.264 RTP output into a container using FFMPEG? -

-

i working on effects of network losses in video transmission. in order simulate network losses use simple program drops random rtp packets output of h.264 rtp encoding.

i use joint model (jm) 14.2 in order encode video. however, don't use annexb format output, instead choose output rtp packets. jm output generated rtp packets rtp headers , payload sequence. after that, of rtp packets dropped using simple program. then, can decode output bitstream using jm , it's error concealment methods.

the main purpose of process evaluate differences created network losses on human video quality perception. in order measure perceived quality, shown video must in decoded form (i.e. full resolution) or can decodable @ receiver side. rtp packets created jm encoder cannot decoded without jm software installed. however, proper header (or container) video players able decode bitstream. so, goal in question encapsulate encoded rtp packet bitstream in common container such avi or mp4 have content decodable @ receiver computer.

the format of encoded bitstream in rtp packetized form follows:

     ----------------------------------------------------------------------      | rtp header #1 | rtp payload #1 | rtp header #2 | rtp payload #2 |...      ----------------------------------------------------------------------

in order find video quality, want make subjective test these bitstreams. can make these test using full resolution data decoded myself whereas it's inconvenient crowdsource subjective test gbs of video data on internet. so, want mux these bitstreams container (i.e. avi) using ffmpeg. have tried decode these bitstreams ffmpeg , ffplay; however, both of them didn't work. tried following command , didn't work, either.

    ffmpeg - f h264 -i <raw_rtpdropped.264> -vcodec copy -r 25 out.avi

which format or muxer should use? need convert these files other format?

i think i'll attempt convince once more: encoding method of taking raw video , compressing it. reduces size of video, want, , reduces quality (you can't nothing). multiplexing term used in many sciences, , means taking 2 or more data streams , turning them 1. when mux video, mean take encoded video , add audio, or video put in container such mpeg2 transport, or mpeg4 iso based containers. avi container/ multiplex of video (hence name audio video interleave) not solve issue gb of data. wikipedia: "an avi file may carry audio/visual data inside chunks in virtually compression scheme, including full frame (uncompressed), intel real time (indeo), cinepak, motion jpeg, editable mpeg, vdowave, clearvideo / realvideo, qpeg, , mpeg-4 video."


Comments

Post a Comment

Popular posts from this blog

css - Which browser returns the correct result for getBoundingClientRect of an SVG element? -

-
this svg contains rect overflows svg element: <svg id='svg' width='10' height='10'> <rect x='-10' y='-10' width='30' height='30'/> </svg> chrome 28 , opera 12 return getboundingclientrect() svg element width , height of 10. firefox 23 reports width , height of 30. correct? jsfiddle the relevant spec cssom , delegates svg spec if svg element not "have associated css layout box". haven't found definition of "having associated css layout box", correct result seem hinge on definition, getbbox returns 30x30 rect in browsers. this firefox bug fixed now, fix in firefox nightlies , should make through firefox 33 released on 14 october 2014. see bug 530985 details.
Read more

gcc - Calling fftR4() in c from assembly -

-
i trying asm fft implementation www.embeddedsignals.com work. running make gives error: undefined reference fftr4(short*, short*, int) at top of asm have .syntax unified .thumb .global fftr4 .type fftr4, %function and there #define's associate c functions arguments registers followed macros fftr4 function uses. after that, fftr4 called .thumb_func fftr4: stmfd sp!, {r4-r11, lr} mov tmp0, #0 // bit reversed counter mov tmp1, #0 .word 0xf3a2fa92 //rbit r3,r2 //rbit r,n lsl r,#3 and c code follows: void fftr4(short *y, short *x, int n); short x[512]; short y[512]; int i; void loop() { (i=0;i<512;i++) x[i]=0; (i=0;i<512;i=i+8) { x[i+0]=16384; x[i+2]=16384; x[i+4]=-16384; x[i+6]=-16384;} fftr4(y, x, 256); serialusb.println(y[128]); serialusb.println(y[129]); serialusb.println(y[384]); serialusb.println(y[385]); // expected results: //y[128]is 8191; y[129] -8190 y[...
Read more

.htaccess - Matching full URL in RewriteCond -

-
i'm trying block post access site (and return 403), except 2 ip's , 1 url ( http://mydomain.com/about-us/contact-us/ ). here's have: rewritecond %{request_method} post rewritecond %{remote_addr} !=1.2.3.4 rewritecond %{remote_addr} !=4.3.2.1 rewritecond %{request_uri} !^http://mydomain.com/about-us/contact-us/$ rewriterule ^ / [f] these rules allowing access ip properly, contact page still not accessible. i'm not sure i'm using request_uri correctly? i've tried variations relative urls rewritecond %{request_uri} !^/about-us/contact-us$ , rewritecond %{request_uri} !^/about-us/contact-us/$ without luck. what doing wrong please? it looks me rule on file name specific. if relax bit, should work. made few other esthetic tweaks. give try: rewritecond %{request_method} post rewritecond %{remote_addr} !^1.2.3.4 rewritecond %{remote_addr} !^4.3.2.1 rewritecond %{request_uri} !about-us/contact-us rewriterule ^ - [f]
Read more