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./ffmpeg -f lavfi -i testsrc=rate=30 -filter_complex "anullsrc[a];testsrc=rate=30[v]" -map "[v]" -map "[a]" -f flv <rtmp>
Results in high FPS.
frame= 6789 fps=672 q=10.2 Lsize= 15829kB time=00:03:46.30 bitrate= 573.0kbits/s speed=22.4x
Why if I set rate on testsrc?
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