When I try to run the following command to do rtsp streaming ffmpeg -r 1 -i frame_%05d.pgm -b 18000 -vcodec libx264 -y -vpre slow http://condor1:8090/feed1.ffm I get the following results Input #0, image2, from 'frame_%05d.pgm': Duration: 00:00:24.00, start: 0.000000, bitrate: N/A Stream #0.0: Video: pgm, gray, 3332x332, 1 fps, 1 tbr, 1 tbn, 1 tbc [buffer @ 0x12b11050] w:3332 h:332 pixfmt:gray [scale @ 0x12b11430] w:3332 h:332 fmt:gray -> w:640 h:160 fmt:yuv420p flags:0xa0000004 [buffer @ 0x12b14b20] w:3332 h:332 pixfmt:gray [ffsink @ 0x12b16400] auto-inserting filter 'auto-inserted scaler 0' between the filter '(null)' and the filter 'out' Impossible to convert between the formats supported by the filter 'auto-inserted scaler 0' and the filter 'out' Error opening filters! [flv @ 0x12b16d60] automatic thread number detection not supported by codec, patch welcome Output #0, ffm, to 'http://condor1:8090/feed1.ffm': Stream #0.0: Video: flv, yuv420p, 640x160, q=1-5, 200 kb/s, 1000k tbn, 15 tbc Stream #0.1: Video: [0][0][0][0] / 0x0000, (null), q=0-0, 102400 kb/s, 1000k tbn Stream mapping: Stream #0.0 -> #0.0 Stream #0.0 -> #0.1 Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height *** glibc detected *** /home/champ/deps/ffmpeg-HEAD-60c68c0/ffmpeg: free(): invalid pointer: 0x0000000012b13220 ***