add example video and the tests for bash-video

bash-video.sh

@@ -67,24 +67,35 @@ function join_videos() {
   OUTPUT_FILE=$3
   verify_file "$INPUT_FILE1"
   verify_file "$INPUT_FILE2"
-  ffmpeg -i "concat:$INPUT_FILE1|$INPUT_FILE2" -c copy "$OUTPUT_FILE" || exit 1
+
+  # Create a temporary file to store the list of input files
+  TEMP_FILE=$(mktemp)
+  echo "file '$(realpath "$INPUT_FILE1")'" > "$TEMP_FILE"
+  echo "file '$(realpath "$INPUT_FILE2")'" >> "$TEMP_FILE"
+
+  # Use the concat demuxer with the temporary file
+  ffmpeg -f concat -safe 0 -i "$TEMP_FILE" -c copy -y "$(realpath "$OUTPUT_FILE")" || exit 1
+
+  # Remove the temporary file
+  rm "$TEMP_FILE"
 }
 
-# Change playback speed
 function change_speed() {
   INPUT_FILE=$1
   SPEED_FACTOR=$2
   OUTPUT_FILE=$3
   verify_file "$INPUT_FILE"
-  ffmpeg -i "$INPUT_FILE" -filter:v "setpts=$SPEED_FACTOR*PTS" -filter:a "atempo=$SPEED_FACTOR" "$OUTPUT_FILE" || exit 1
+
+  RECIPROCAL_FACTOR=$(awk "BEGIN {print 1/$SPEED_FACTOR}")
+  ffmpeg -i "$INPUT_FILE" -filter:v "setpts=$RECIPROCAL_FACTOR*PTS" -filter:a "atempo=$SPEED_FACTOR" "$OUTPUT_FILE" || exit 1
 }
 
 # Optimize video to reduce size
 function optimize_video() {
   INPUT_FILE=$1
   OUTPUT_FILE=$2
   verify_file "$INPUT_FILE"
-  ffmpeg -i "$INPUT_FILE" -vcodec libx264 -crf 28 "$OUTPUT_FILE" || exit 1
+  ffmpeg -i "$INPUT_FILE" -vcodec libx264 -crf 32 -filter:v fps=15 -b:a 96k "$OUTPUT_FILE" || exit 1
 }
 
 # Remove a segment from the beginning of the video
@@ -122,7 +133,7 @@ function extract_audio() {
   INPUT_FILE=$1
   OUTPUT_FILE=$2
   verify_file "$INPUT_FILE"
-  ffmpeg -i "$INPUT_FILE" -vn -acodec copy "$OUTPUT_FILE" || exit 1
+  ffmpeg -i "$INPUT_FILE" -vn -acodec libmp3lame -b:a 128k "$OUTPUT_FILE" || exit 1
 }
 
 # Add audio to video
@@ -169,7 +180,7 @@ function rotate_video() {
   ffmpeg -i "$INPUT_FILE" -vf "$TRANSPOSE" "$OUTPUT_FILE" || exit 1
 }
 
-# Record screen
+# Record screen, not sure if this works, i use obs studio
 function record_screen() {
   OUTPUT_FILE=$1
   DURATION=$2

subtitles.srt

@@ -0,0 +1,11 @@
+1
+00:00:00,000 --> 00:00:05,000
+Hello, World!
+
+2
+00:00:05,000 --> 00:00:10,000
+This is a simple subtitle example.
+
+3
+00:00:10,000 --> 00:00:13,000
+Subtitles are displayed at the specified timestamps.

tests.sh

@@ -0,0 +1,11 @@
+./bash-video.sh popright tests/test-1-2-3_14s.mp4 9 tests/popright.mp4
+./bash-video.sh popleft tests/popright.mp4 2 tests/popleft.mp4
+./bash-video.sh trim tests/test-1-2-3_14s.mp4 2 4 tests/trim.mp4
+./bash-video.sh join tests/popleft.mp4 tests/trim.mp4 tests/join.mp4
+./bash-video.sh speedup tests/test-1-2-3_14s.mp4 '4' tests/speedup.mp4
+./bash-video.sh optimize tests/test-1-2-3_14s.mp4 tests/optimize.mp4
+./bash-video.sh extractaudio tests/popleft.mp4 tests/audio.mp3
+./bash-video.sh resize tests/test-1-2-3_14s.mp4 100 100 tests/resize-100-100.mp4
+./bash-video.sh rotate tests/resize-100-100.mp4 90 tests/rotate-90.mp4
+./bash-video.sh addsubtitle tests/test-1-2-3_14s.mp4 ./subtitles.srt tests/subtitle.mp4
+./bash-video.sh filter tests/popleft.mp4 'hue=h=90:s=1:b=0.5' tests/filter.mp4