delay.sh

Makefile

@@ -80,7 +80,8 @@ build: $(BUILD_DIR)/$(TARGET)
 
 .PHONY: run
 run: $(BUILD_DIR)/$(TARGET)
-	$(BUILD_DIR)/$(TARGET) $(RUN_ARGS)
+	# $(BUILD_DIR)/$(TARGET) $(RUN_ARGS)
+	$(PROJECT_DIR)/delay.sh /dev/video0 25 640x480 30
 
 .PHONY: submodule-init
 submodule-init:

delay.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+set -e
+
+DEVICE=${1:-/dev/video0}
+DELAY=${2:-30}
+SIZE=${3:-1280x720}
+FPS=${4:-20}
+
+rm -rf /tmp/delay_stream*
+
+ffmpeg -f v4l2 -framerate $FPS -video_size $SIZE -i $DEVICE \
+  -vcodec libx264 -preset ultrafast -tune zerolatency \
+  -f hls -hls_time 1 -hls_list_size $((DELAY + 5)) -hls_flags delete_segments \
+  /tmp/delay_stream.m3u8 &
+FFMPEG_PID=$!
+
+start=`date +%s`
+
+until [ -f /tmp/delay_stream.m3u8 ]; do sleep 0.1; done
+
+end=`date +%s`
+
+sleep $((DELAY - end + start))
+
+ffplay /tmp/delay_stream.m3u8
+
+kill $FFMPEG_PID $HTTP_PID