improve stream testing script (#2525)

* merge testContent.sh into ocContent.sh

* detect ffmpeg

ffmpeg or ffmpeg.exe in path, current dir, or parent dir

* use ocTestStream in api test

* enable verbose logging for api tests

* log ffmpeg version

* change ffmpeg lookup order

* set path properly for using the local ffmpeg

* rm double space from transcoder error logs

* update tests for new video stream

do not test bitrate

* set test stream target to 127.0.0.1

* log ffmpeg path

* update ffmpeg to v4.4.1

* improve logs

* fix ffmpeg installer script

* fix api test runner

* fix logs

* install fonts

* cleanup

* use ocTestStream.sh for all automated tests

* cleanup ocTestStream.sh

* cleanup test/automated/hls/run.sh

* Fix misspell

* fix ffmpeg installer in automated test runners

* spell fix

* cleanup script

* rev quick api tests

* cleanup tmp paths properly in automated tests

* rm unused ffmpeg package

* cleanup

test/testContent.sh

@@ -1,29 +0,0 @@
-#!/bin/sh
-
-ffmpeg -hide_banner -loglevel panic -re -f lavfi \
-	-i "testsrc=size=1280x720:rate=60[out0];sine=frequency=400:sample_rate=48000[out1]" \
-	-vf "[in]drawtext=fontsize=96: box=1: boxcolor=black@0.75: boxborderw=5: fontcolor=white: x=(w-text_w)/2: y=((h-text_h)/2)+((h-text_h)/-2): text='Owncast Test Stream', drawtext=fontsize=96: box=1: boxcolor=black@0.75: boxborderw=5: fontcolor=white: x=(w-text_w)/2: y=((h-text_h)/2)+((h-text_h)/2): text='%{gmtime\:%H\\\\\:%M\\\\\:%S} UTC'[out]" \
-	-nal-hrd cbr \
-	-metadata:s:v encoder=test \
-	-vcodec libx264 \
-	-acodec aac \
-	-preset veryfast \
-	-profile:v baseline \
-	-tune zerolatency \
-	-bf 0 \
-	-g 0 \
-	-b:v 6320k \
-	-b:a 160k \
-	-ac 2 \
-	-ar 48000 \
-	-minrate 6320k \
-	-maxrate 6320k \
-	-bufsize 6320k \
-	-muxrate 6320k \
-	-r 60 \
-	-pix_fmt yuv420p \
-	-color_range 1 -colorspace 1 -color_primaries 1 -color_trc 1 \
-	-flags:v +global_header \
-	-bsf:v dump_extra \
-	-x264-params "nal-hrd=cbr:min-keyint=2:keyint=2:scenecut=0:bframes=0" \
-	-f flv "rtmp://127.0.0.1/live/abc123" >/dev/null