I am new to libav tool avconv and trying to create a mosaic to output. Unfortunately I haven't succeeded yet, my command line is below. How to get it working?
~/mosaic$ avconv -i MTV3.ts -i MTV3.ts -i MTV3.ts -i MTV3.ts -filter_complex 'nullsrc=size=640x480 [base]; [0:v] setpts=PTS-STARTPTS, scale=320x240 [upperleft]; [1:v] setpts=PTS-STARTPTS, scale=320x240 [upperright]; [2:v] setpts=PTS-STARTPTS, scale=320x240 [lowerleft];[3:v] setpts=PTS-STARTPTS, scale=320x240 [lowerright]; [base][upperleft] overlay=shortest=1 [tmp1];[tmp1][upperright] overlay=shortest=1:x=320 [tmp2];[tmp2][lowerleft] overlay=shortest=1:y=240 [tmp3];[tmp3][lowerright] overlay=shortest=1:x=320:y=240' -c:v libx264 -f mpegts udp://226.229.1.1:1111avconv version 9.16-6:9.16-0ubuntu0.14.04.1, Copyright (c) 2000-2014 the Libav developers built on Aug 10 2014 18:16:02 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)[mpegts @ 0x2285f60] max_analyze_duration reached[NULL @ 0x22ab800] start time is not set in estimate_timings_from_pts[NULL @ 0x22ad940] start time is not set in estimate_timings_from_pts[mpegts @ 0x2285f60] PES packet size mismatch Last message repeated 2 timesGuessed Channel Layout for Input Stream #0.1 : stereoGuessed Channel Layout for Input Stream #0.2 : stereoInput #0, mpegts, from 'MTV3.ts': Duration: 00:03:14.34, start: 11661.014122, bitrate: 3399 kb/s Program 49 Metadata: service_name : MTV3 service_provider: MTV Oy Stream #0.0[0x131]: Video: mpeg2video (Main), yuv420p, 720x576 [PAR 64:45 DAR 16:9], 5000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc Stream #0.1[0x231](fin): Audio: mp2, 48000 Hz, stereo, s16p, 224 kb/s Stream #0.2[0x232](dut): Audio: mp2, 48000 Hz, stereo, s16p, 128 kb/s (visual impaired) Stream #0.3[0x331](fin): Subtitle: [6][0][0][0] / 0x0006 Stream #0.4[0x431](fin): Subtitle: dvbsub Stream #0.5[0x432](dut): Subtitle: dvbsub[mpegts @ 0x228c160] max_analyze_duration reached[NULL @ 0x22b1700] start time is not set in estimate_timings_from_pts[NULL @ 0x22ac400] start time is not set in estimate_timings_from_pts[mpegts @ 0x228c160] PES packet size mismatch Last message repeated 2 timesGuessed Channel Layout for Input Stream #1.1 : stereoGuessed Channel Layout for Input Stream #1.2 : stereoInput #1, mpegts, from 'MTV3.ts': Duration: 00:03:14.34, start: 11661.014122, bitrate: 3399 kb/s Program 49 Metadata: service_name : MTV3 service_provider: MTV Oy Stream #1.0[0x131]: Video: mpeg2video (Main), yuv420p, 720x576 [PAR 64:45 DAR 16:9], 5000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc Stream #1.1[0x231](fin): Audio: mp2, 48000 Hz, stereo, s16p, 224 kb/s Stream #1.2[0x232](dut): Audio: mp2, 48000 Hz, stereo, s16p, 128 kb/s (visual impaired) Stream #1.3[0x331](fin): Subtitle: [6][0][0][0] / 0x0006 Stream #1.4[0x431](fin): Subtitle: dvbsub Stream #1.5[0x432](dut): Subtitle: dvbsub[mpegts @ 0x2289d60] max_analyze_duration reached[NULL @ 0x22b8540] start time is not set in estimate_timings_from_pts[NULL @ 0x22b2580] start time is not set in estimate_timings_from_pts[mpegts @ 0x2289d60] PES packet size mismatch Last message repeated 2 timesGuessed Channel Layout for Input Stream #2.1 : stereoGuessed Channel Layout for Input Stream #2.2 : stereoInput #2, mpegts, from 'MTV3.ts': Duration: 00:03:14.34, start: 11661.014122, bitrate: 3399 kb/s Program 49 Metadata: service_name : MTV3 service_provider: MTV Oy Stream #2.0[0x131]: Video: mpeg2video (Main), yuv420p, 720x576 [PAR 64:45 DAR 16:9], 5000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc Stream #2.1[0x231](fin): Audio: mp2, 48000 Hz, stereo, s16p, 224 kb/s Stream #2.2[0x232](dut): Audio: mp2, 48000 Hz, stereo, s16p, 128 kb/s (visual impaired) Stream #2.3[0x331](fin): Subtitle: [6][0][0][0] / 0x0006 Stream #2.4[0x431](fin): Subtitle: dvbsub Stream #2.5[0x432](dut): Subtitle: dvbsub[mpegts @ 0x22d3da0] max_analyze_duration reached[NULL @ 0x2396340] start time is not set in estimate_timings_from_pts[NULL @ 0x2396bc0] start time is not set in estimate_timings_from_pts[mpegts @ 0x22d3da0] PES packet size mismatch Last message repeated 2 timesGuessed Channel Layout for Input Stream #3.1 : stereoGuessed Channel Layout for Input Stream #3.2 : stereoInput #3, mpegts, from 'MTV3.ts': Duration: 00:03:14.34, start: 11661.014122, bitrate: 3399 kb/s Program 49 Metadata: service_name : MTV3 service_provider: MTV Oy Stream #3.0[0x131]: Video: mpeg2video (Main), yuv420p, 720x576 [PAR 64:45 DAR 16:9], 5000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc Stream #3.1[0x231](fin): Audio: mp2, 48000 Hz, stereo, s16p, 224 kb/s Stream #3.2[0x232](dut): Audio: mp2, 48000 Hz, stereo, s16p, 128 kb/s (visual impaired) Stream #3.3[0x331](fin): Subtitle: [6][0][0][0] / 0x0006 Stream #3.4[0x431](fin): Subtitle: dvbsub Stream #3.5[0x432](dut): Subtitle: dvbsub[scale @ 0x22b65a0] [Eval @ 0x7fff1b7fccd0] Invalid chars 'x240' at the end of expression '320x240' Last message repeated 1 timesError when evaluating the expression '320x240'[scale @ 0x22b65a0] Failed to configure output pad on Parsed filter 2 scale
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