From 13010a9812a3a419a36f6cda63ce3c9e323ae96d Mon Sep 17 00:00:00 2001
From: Yannik Enss <me@adnidor.de>
Date: Sun, 10 May 2020 11:06:47 +0200
Subject: [PATCH] init

---
 jumpcutter.py | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100755 jumpcutter.py

diff --git a/jumpcutter.py b/jumpcutter.py
new file mode 100755
index 0000000..ab05f87
--- /dev/null
+++ b/jumpcutter.py
@@ -0,0 +1,64 @@
+#!/usr/bin/python3
+import subprocess as sp
+from shlex import quote
+import re
+import argparse
+import sys, os
+
+FFMPEG_SILENCEDETECT_COMMAND = "ffmpeg -y -hide_banner -nostats -i {filename} -af silencedetect=d=0.3 -map 0 -map -0:v -f wav /dev/null"
+
+SILENCE_START_RE = re.compile("^\[silencedetect @ 0x[0-9a-f]+\] silence_start: ([\d\.]+)$")
+SILENCE_END_RE = re.compile("^\[silencedetect @ 0x[0-9a-f]+\] silence_end: ([\d\.]+) \| silence_duration: ([\d\.]+)$")
+
+def cut(in_file, out_file="out_file.mkv", silences=[]):
+    betweens = ""
+    for silence in silences:
+        betweens += f"between(t,{silence[0]},{silence[1]})+"
+
+    betweens = betweens[:-1] if betweens else betweens
+
+    video_filter = f"select='{betweens}',setpts=N/FRAME_RATE/TB"
+    audio_filter = f"aselect='{betweens}',asetpts=N/SR/TB"
+
+    command = ["ffmpeg", "-i", in_file, "-vf", video_filter, "-af", audio_filter, out_file]
+
+    sp.run(command)
+
+def detect_silence(filename):
+    output = sp.run(FFMPEG_SILENCEDETECT_COMMAND.format(filename=quote(filename)), shell=True, stderr=sp.PIPE).stderr
+    total_silence = 0 
+    talking = []
+    current_silence = ["0", None]
+    for line in output.split(b"\n"):
+        line = line.strip()
+        line = line.decode("utf8")
+        if not "silencedetect" in line:
+            continue
+        if match := SILENCE_START_RE.match(line):
+            print("Silence start at", match[1])
+            current_silence[1] = match[1]
+            talking.append(tuple(current_silence))
+        elif match := SILENCE_END_RE.match(line):
+            print("Silence end at", match[1])
+            current_silence[0] = match[1]
+            total_silence += float(match.group(2))
+
+    print("Total:", total_silence)
+    return talking
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+    parser.add_argument("--output-format", "-f")
+    parser.add_argument("infiles", nargs="+")
+    args = parser.parse_args()
+
+    for f in args.infiles:
+        if not os.path.isfile(f):
+            print(f"{f} not found, skipping...", file=sys.stderr)
+            continue
+
+        new_filename = os.path.splitext(f)[0]+".mkv"
+
+        talking = detect_silence(f)
+        cut(f, new_filename, talking)