<html><body><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div>Hi all</div><div><br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: times new roman,new york,times,serif; background-color: transparent; font-style: normal;">I'm trying to get a single image from an IP Camera MJPEG stream, like this:</div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: times new roman,new york,times,serif; background-color: transparent; font-style: normal;"><br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: times new roman,new york,times,serif; background-color: transparent; font-style: normal;">ffmpeg -i http://192.168.99.97/video.mjpg -vframes 1 -y algo.jpeg<br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: times new roman,new york,times,serif; background-color: transparent; font-style: normal;"><br></div><div style="color:
rgb(0, 0, 0); font-size: 16px; font-family: times new roman,new york,times,serif; background-color: transparent; font-style: normal;">It works. But there is a significant delay (between 10 and 20 seconds) getting the frame. I assume that this time is used to "guess" the right video settings from the source. I need this to return as soon as possible. Can someone help me with the right settings for the command line ? thx.<br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: times new roman,new york,times,serif; background-color: transparent; font-style: normal;"><br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: times new roman,new york,times,serif; background-color: transparent; font-style: normal;">emelo@alfa:~> ffmpeg -i http://192.168.99.97/video.mjpg -vframes 1 -y algo.jpeg <br>ffmpeg version 0.11.1 Copyright (c) 2000-2012 the FFmpeg developers<br> built on Jun 10 2012 22:43:48
with gcc 4.5.1 20101208 [gcc-4_5-branch revision 167585]<br> configuration: --shlibdir=/usr/lib64 --prefix=/usr --mandir=/usr/share/man --libdir=/usr/lib64 --enable-shared --disable-static --enable-debug --disable-stripping --extra-cflags='-fmessage-length=0 -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables -fasynchronous-unwind-tables -g -fPIC -I/usr/include/gsm' --enable-gpl --enable-x11grab --enable-version3 --enable-pthreads --enable-avfilter --enable-libpulse --enable-libvpx --enable-libmp3lame --enable-libvorbis --enable-libtheora --enable-libspeex --enable-libxvid --enable-libx264 --enable-libschroedinger --enable-libgsm --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-postproc --enable-libdc1394 --enable-librtmp --enable-libfreetype --enable-avresample<br> libavutil 51. 54.100 / 51. 54.100<br> libavcodec 54. 23.100 / 54. 23.100<br>
libavformat 54. 6.100 / 54. 6.100<br> libavdevice 54. 0.100 / 54. 0.100<br> libavfilter 2. 77.100 / 2. 77.100<br> libswscale 2. 1.100 / 2. 1.100<br> libswresample 0. 15.100 / 0. 15.100<br> libpostproc 52. 0.100 / 52. 0.100</div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: times new roman,new york,times,serif; background-color: transparent; font-style: normal;"><<<<<<<<< HERE IS THE DELAY >>>>>>>>>><br>[mjpeg @ 0x62e140] Estimating duration from bitrate, this may be inaccurate<br>Input #0, mjpeg, from
'http://192.168.99.97/video.mjpg': <br> Duration: N/A, bitrate: N/A<br> Stream #0:0: Video: mjpeg, yuvj420p, 640x480 [SAR 1:1 DAR 4:3], 25 fps, 25 tbr, 1200k tbn, 25 tbc<br>[buffer @ 0x917a20] w:640 h:480 pixfmt:yuvj420p tb:1/1200000 sar:1/1 sws_param:flags=2<br>[buffersink @ 0x80d680] No opaque field provided<br>Output #0, image2, to 'algo.jpeg': <br> Metadata:<br> encoder : Lavf54.6.100<br> Stream #0:0: Video: mjpeg, yuvj420p, 640x480 [SAR
1:1 DAR 4:3], q=2-31, 200 kb/s, 90k tbn, 25 tbc<br>Stream mapping:<br> Stream #0:0 -> #0:0 (mjpeg -> mjpeg)<br>Press [q] to stop, [?] for help<br>frame= 1 fps=0.0 q=6.4 Lsize= 0kB time=00:00:00.04 bitrate= 0.0kbits/s <br>video:36kB audio:0kB global headers:0kB muxing overhead -100.000000%<br></div></div></body></html>