[alsa @ 0x170fb20] ALSA buffer xrun.
[Parsed_drawtext_0 @ 0x17496d0] Using "/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf"
[h264_omx @ 0x171c820] Using OMX.broadcom.video_encode
[h264_omx @ 0x171c820] OMX_GetHandle(OMX.broadcom.video_encode) failed: 80001005
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
[alsa @ 0x170fb20] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
[image2 @ 0x1719260] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
Conversion failed!

$FFMPEG -loglevel warning -f alsa -ac 2 -i hw:Loopback,1,0 -fflags +genpts+igndts \
-loop 1 -framerate $FPS -i $IMGS \
-vf "drawtext=fontsize=22:fontfile=/usr/share/fonts/truetype/freefont/FreeSans.ttf:bordercolor=$BCOLOR:borderw=2:fontcolor=$COLOR:textfile=$TEXT:reload=1:y=15:x=15" \
-vcodec h264_omx -g $KEYINT -maxrate 1000k -bufsize 3000k \
-c:a libfdk_aac -b:a 128k -ar 44100 \
-f flv $URL