vid-scratch: Add consolidated versions of my experiments from 2025-02-XXlukeshu/vid-scratch

1 files changed, 19 insertions, 0 deletions

diff --git a/vid-scratch/reschange-mkvgen.sh b/vid-scratch/reschange-mkvgen.sh
new file mode 100755
index 0000000..cbe637d
--- /dev/null
+++ b/vid-scratch/reschange-mkvgen.sh
@@ -0,0 +1,19 @@
+name=${0##*/}
+name=${name%.sh}
+
+rm -f -- "${name}.part1.mkv" "${name}.part2.mkv" "${name}.concat.txt" "${name}.mkv"
+
+# Create a 320x240 clip
+ffmpeg -f lavfi -t 2 -i testsrc=r=30:s=320x240 -c:v vp8 -level 3 -pix_fmt yuv420p "${name}.part1.mkv"
+
+# Create a 640x480 clip
+ffmpeg -f lavfi -t 2 -i testsrc=r=30:s=640x480 -c:v vp8 -level 3 -pix_fmt yuv420p "${name}.part2.mkv"
+
+# Create a text file with the list of files
+{
+	echo "file '${name}.part1.mkv'"
+	echo "file '${name}.part2.mkv'"
+} > "${name}.concat.txt"
+
+# Concatenate the clips
+ffmpeg -f concat -safe 0 -i "${name}.concat.txt" -c:v copy "${name}.mkv"