91 行
5.0 KiB
Bash
91 行
5.0 KiB
Bash
# adjust these parameters to your screen
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BOX_WIDTH=1920 # pixels
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BOX_HEIGHT=1080 # pixels
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BOX_OFFSET_X=0 # pixels
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BOX_OFFSET_Y=0 # pixels
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VIDEO_HEIGHT=360 # pixels
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VIDEO_WIDTH=$(echo "$VIDEO_HEIGHT * $BOX_WIDTH / $BOX_HEIGHT / 2 * 2" | bc) # ensures even width, required for yuv420p
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VIDEO_BITRATE=200 # kbit/s
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AUDIO_BITRATE=64 # kbit/s
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AUDIO_CHANNELS=1 # channels
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FRAMERATE=50 # fps
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HLS_TIME=10 # seconds per segment
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DELETION_THRESHOLD=240 # seconds until segments are deleted
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HLS_LIST_SIZE=$(echo $DELETION_THRESHOLD / $HLS_TIME | bc)
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mkdir -p stream
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rm stream/*
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# This exists so we can corrupt video streams of viewers who are too delayed
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ffmpeg -f lavfi -i color=size="$BOX_WIDTH"x"$BOX_HEIGHT":rate=$FRAMERATE:color=black \
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-f lavfi -i anullsrc=channel_layout=stereo:sample_rate=48000 \
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-t 1 \
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-f hls -hls_init_time 0 -hls_time $HLS_TIME -hls_list_size $HLS_LIST_SIZE -hls_flags delete_segments -hls_segment_type fmp4 \
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-map_metadata -1 -fflags +bitexact -flags:v +bitexact -flags:a +bitexact \
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stream/corrupt.m3u8
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rm stream/corrupt.m3u8 stream/init.mp4
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mv stream/corrupt0.m4s stream/corrupt.m4s
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# This is the command you should edit
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ffmpeg -thread_queue_size 2048 -video_size "$BOX_WIDTH"x"$BOX_HEIGHT" -framerate $FRAMERATE -f x11grab -i :0.0+$BOX_OFFSET_X,$BOX_OFFSET_Y \
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-thread_queue_size 2048 -f pulse -i default \
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-c:v libx264 -b:v "$VIDEO_BITRATE"k -tune zerolatency -preset slower -g $FRAMERATE -sc_threshold 0 -pix_fmt yuv420p \
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-filter:v scale=$VIDEO_WIDTH:$VIDEO_HEIGHT,"drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeMonoBold.ttf:text='%{gmtime}':fontcolor=white@0.75:box=1:boxborderw=2:boxcolor=black@0.5:fontsize=24:x=8:y=6" \
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-c:a aac -b:a "$AUDIO_BITRATE"k -ac $AUDIO_CHANNELS \
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-f hls -hls_init_time 0 -hls_time $HLS_TIME -hls_list_size $HLS_LIST_SIZE -hls_flags delete_segments -hls_segment_type fmp4 \
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-map_metadata -1 -fflags +bitexact -flags:v +bitexact -flags:a +bitexact \
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stream/stream.m3u8
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# TODO: low-latency HLS
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# https://stackoverflow.com/a/63229182/15580043
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# https://github.com/video-dev/hls.js/projects/7
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# https://www.ffmpeg.org/ffmpeg-formats.html#dash-2
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# https://github.com/video-dev/hls.js/issues/2861
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# software encoding
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# -c:v libx264 -crf 31 -maxrate "$VIDEO_BITRATE"k -bufsize 1M -tune zerolatency -preset slower -g $FRAMERATE -sc_threshold 0 -pix_fmt yuv420p \
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# -c:v libx264 -b:v "$VIDEO_BITRATE"k -tune zerolatency -preset slower -g $FRAMERATE -sc_threshold 0 -pix_fmt yuv420p \
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# example Nvidia hardware encoding; see https://trac.ffmpeg.org/wiki/HWAccelIntro
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# -c:v h264_nvenc -rc cbr_ld_hq -b:v "$VIDEO_BITRATE"k -preset llhp -g $FRAMERATE -sc_threshold 0 -pix_fmt yuv420p \
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# this is the deprecated version of the timestamp; it shows local time
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# -vf drawtext="expansion=strftime:fontfile='/usr/share/fonts/cantarell/Cantarell-Light.otf':fontsize=128:fontcolor=white:shadowcolor=black:shadowx=2:shadowy=1:text='%T':x=80:y=8" \
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# links about overlaying a timestamp
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# https://unix.stackexchange.com/questions/508194/how-to-embed-current-time-with-ffmpeg
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# https://einar.slaskete.net/2011/09/05/adding-time-stamp-overlay-to-video-stream-using-ffmpeg/
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# https://video.stackexchange.com/questions/28999/how-to-burn-timestamp-in-video-with-different-date-format-using-ffmpeg
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# https://superuser.com/questions/1020102/adding-a-timestamp-on-frames-captured-using-ffmpeg
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# DASH
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# DASH can do multiple video/audio streams at different bandwidths
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# dashjs didn't work easily in Tor Browser, someone else can figure it out
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# TODO: find DASH equivalent of -hls_flags delete_segments
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#
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#VIDEO_HEIGHT_0=420 # pixels
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#VIDEO_WIDTH_0=$(echo "$VIDEO_HEIGHT_0 * 16 / 9 / 2 * 2" | bc)
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#VIDEO_WIDTH_1=$(echo "$VIDEO_HEIGHT_1 * 16 / 9 / 2 * 2" | bc)
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#VIDEO_BITRATE_0=400 # kbit/s
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#VIDEO_BITRATE_1=200 # kbit/s
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#
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#ffmpeg -thread_queue_size 2048 -video_size "$BIX_WIDTH"x"$BOX_HEIGHT" -framerate $FRAMERATE -f x11grab -i :0.0+$BOX_OFFSET_X,$BOX_OFFSET_Y \
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# -thread_queue_size 2048 -f pulse -i default \
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# -map 0:v -map 0:v -map 1:a \
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# -c:v:0 h264 -b:v "$VIDEO_BITRATE_0"k -preset slow -g $FRAMERATE -sc_threshold 0 -pix_fmt yuv420p \
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# -c:v:1 h264 -b:v "$VIDEO_BITRATE_1"k -preset slow -g $FRAMERATE -sc_threshold 0 -pix_fmt yuv420p \
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# -filter:v:0 scale=$VIDEO_WIDTH_0:$VIDEO_HEIGHT_0,"drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeMonoBold.ttf:text='%{gmtime}':fontcolor=white@0.75:box=1:boxborderw=2:boxcolor=black@0.5:fontsize=24:x=8:y=6" \
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# -filter:v:1 scale=$VIDEO_WIDTH_1:$VIDEO_HEIGHT_1,"drawtext=fontfile=/usr/share/fonts/truetype/freefont/FreeMonoBold.ttf:text='%{gmtime}':fontcolor=white@0.75:box=1:boxborderw=2:boxcolor=black@0.5:fontsize=24:x=8:y=6" \
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# -c:a aac -b:a "$AUDIO_BITRATE"k -ac $AUDIO_CHANNELS \
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# -f dash -hls_init_time 0 -hls_time $HLS_TIME -hls_list_size $HLS_LIST_SIZE -adaptation_sets "id=0,streams=v id=1,streams=a" -ldash 1 \
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# -map_metadata -1 -fflags +bitexact -flags:v +bitexact -flags:a +bitexact \
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# stream/stream.mpd
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