[FFmpeg-user] FFmpeg mosaic

[alexdjca]

Hi All,

following this help  Create Mosaic with FFMPEG
<https://trac.ffmpeg.org/wiki/Create%20a%20mosaic%20out%20of%20several%20input%20videos>  
i've created a nice mosaic i run to keep a constant eye on a lot of
different live streams I've published in my network, and the presence of
audio in each of them.

The final code i've built is the following:

ffmpeg -probesize 1M  \
 -i udp://239.98.181.1:6000?fifo_size=100000?overrun_nonfatal=1 \
 -i udp://239.98.181.2:6000?fifo_size=100000?overrun_nonfatal=1 \
 -i udp://239.98.181.3:6000?fifo_size=100000?overrun_nonfatal=1 \
 -i udp://239.98.181.4:6000?fifo_size=100000?overrun_nonfatal=1 \
 -i udp://239.98.181.6:6000?fifo_size=100000?overrun_nonfatal=1 \
 -i udp://239.98.181.7:6000?fifo_size=100000?overrun_nonfatal=1 \
 -i udp://239.98.181.3:6000?fifo_size=100000?overrun_nonfatal=1 \
 -i udp://239.98.181.2:6000?fifo_size=100000?overrun_nonfatal=1 \
 -i udp://239.98.181.4:6000?fifo_size=100000?overrun_nonfatal=1 \
 -i udp://239.98.181.1:6000?fifo_size=100000?overrun_nonfatal=1 \
 -i udp://239.98.181.7:6000?fifo_size=100000?overrun_nonfatal=1 \
 -i udp://239.98.181.2:6000?fifo_size=100000?overrun_nonfatal=1 \
-filter_complex "color=c=black:size=1280x720 [base];\
                [0:v] setpts=PTS-STARTPTS, scale=224x192,
drawtext=text='TESTO1'[r1p1];\
                [0:a] showvolume=b=1:h=10:w=200:o=v [r1p1a];\
                [1:v] setpts=PTS-STARTPTS, scale=224x192 [r1p2];\
                [1:a] showvolume=b=1:h=10:w=200:o=v [r1p2a];\
                [2:v] setpts=PTS-STARTPTS, scale=224x192 [r1p3];\
                [2:a] showvolume=b=1:h=10:w=200:o=v [r1p3a];\
                [3:v] setpts=PTS-STARTPTS, scale=224x192 [r1p4];\
                [3:a] showvolume=b=1:h=10:w=200:o=v [r1p4a];\
                [4:v] setpts=PTS-STARTPTS, scale=224x192 [r2p1];\
                [4:a] showvolume=b=1:h=10:w=200:o=v [r2p1a];\
                [5:v] setpts=PTS-STARTPTS, scale=224x192 [r2p2];\
                [5:a] showvolume=b=1:h=10:w=200:o=v [r2p2a];\
                [6:v] setpts=PTS-STARTPTS, scale=224x192 [r2p3];\
                [6:a] showvolume=b=1:h=10:w=200:o=v [r2p3a];\
                [7:v] setpts=PTS-STARTPTS, scale=224x192 [r2p4];\
                [7:a] showvolume=b=1:h=10:w=200:o=v [r2p4a];\
                [8:v] setpts=PTS-STARTPTS, scale=224x192 [r3p1];\
                [8:a] showvolume=b=1:h=10:w=200:o=v [r3p1a];\
                [9:v] setpts=PTS-STARTPTS, scale=224x192 [r3p2];\
                [9:a] showvolume=b=1:h=10:w=200:o=v [r3p2a];\
                [10:v] setpts=PTS-STARTPTS, scale=224x192 [r3p3];\
                [10:a] showvolume=b=1:h=10:w=200:o=v [r3p3a];\
                [11:v] setpts=PTS-STARTPTS, scale=224x192 [r3p4];\
                [11:a] showvolume=b=1:h=10:w=200:o=v [r3p4a];\
                [base][r1p1] overlay=shortest=0:x=50:y=10 [stop1];
[stop1][r1p1a] overlay=shortest=0:x=0:y=0 [tmp1];\
                [tmp1][r1p2] overlay=shortest=0:x=370:y=10 [stop2];
[stop2][r1p2a] overlay=shortest=0:x=320:y=0 [tmp2];\
                [tmp2][r1p3] overlay=shortest=0:x=690:y=10  [stop3];
[stop3][r1p3a] overlay=shortest=0:x=640:y=0 [tmp3];\
                [tmp3][r1p4] overlay=shortest=0:x=1010:y=10  [stop4];
[stop4][r1p4a] overlay=shortest=0:x=960:y=0 [tmp4];\
                [tmp4][r2p1] overlay=shortest=0:x=50:y=250 [stop5];
[stop5][r2p1a] overlay=shortest=0:x=0:y=240 [tmp5]; \
                [tmp5][r2p2] overlay=shortest=0:x=370:y=250 [stop6];
[stop6][r2p2a] overlay=shortest=0:x=320:y=240 [tmp6]; \
                [tmp6][r2p3] overlay=shortest=0:x=690:y=250 [stop7];
[stop7][r2p3a] overlay=shortest=0:x=640:y=240 [tmp7]; \
                [tmp7][r2p4] overlay=shortest=0:x=1010:y=250 [stop8];
[stop8][r2p4a] overlay=shortest=0:x=960:y=240 [tmp8]; \
                [tmp8][r3p1] overlay=shortest=0:x=50:y=490 [stop9];
[stop9][r3p1a] overlay=shortest=0:x=0:y=480 [tmp9]; \
                [tmp9][r3p2] overlay=shortest=0:x=370:y=490 [stop10];
[stop10][r3p2a] overlay=shortest=0:x=320:y=480 [tmp10]; \
                [tmp10][r3p3] overlay=shortest=0:x=690:y=490 [stop11];
[stop11][r3p3a] overlay=shortest=0:x=640:y=480 [tmp11]; \
                [tmp11][r3p4] overlay=shortest=0:x=1010:y=490 [stop12];
[stop12][r3p4a] overlay=shortest=0:x=960:y=480" \
-c:v mpeg2video -b:v 4M -minrate 4M -maxrate 4M -map 0 -map 1 -map 2 -map 3
-map 4 -map 5 -map 6 -map 7 -map 8 -map 9 -map 10 -map 11 -f mpegts
udp://239.98.181.20:6000


The result is quite good but there is a major issue i cannot figure out how
to fix.

Basically until all the streams are running fine the mosaic is perfect, but
as soon as one of the input is missing all the mosaic stops and there is no
way to let it start again.

Another issue (minor actually) is that ffmpeg, before to compose the mosaic,
needs to analyze all the streams so it takes a lot to start.

Can anybody help me to find a solution please?

Thanks in advance.

Alex



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