Add ges-multi-split.py

diff --git a/python/ges-multi-split.py b/python/ges-multi-split.py
new file mode 100755 (executable)
index 0000000..dbc3641
--- /dev/null
+++ b/python/ges-multi-split.py
@@ -0,0 +1,82 @@
+#!/usr/bin/env python3
+#
+# ges-multi-cut - generate commands to split a video file into multiple clips
+#
+# Copyright (C) 2016  Antonio Ospite <ao2@ao2.it>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+import sys
+
+CLIP_FILENAME_TEMPLATE = "sample_%s.webm"
+CLIP_FORMAT = "video/webm:video/x-vp8:audio/x-vorbis"
+
+
+def timeformat_to_seconds(timeformat):
+    """Convert a time string in the format HH:MM:SS.dd to seconds"""
+    multipliers = [3600, 60, 1]
+    return sum([mult*val for mult, val in
+                zip([float(t) for t in timeformat.split(':')], multipliers)])
+
+
+def parse_samples_list(samples_list_filename):
+    """Parse a file in a custom format.
+    Each line in the file has this format:
+
+        SAMPLE_NAME HH:MM:SS.ddd HH:MM:SS.ddd
+
+    where sample name is a string and the two time fields are the start time of the
+    sample and the end time of the sample.
+
+    Returns a list where each item is a tuple:
+        (sample_name, start_time, end_time)
+    """
+    samples = []
+
+    with open(samples_list_filename, "r") as samples_list_file:
+        for row in samples_list_file:
+            sample_name, start_timeformat, end_timeformat = row.split()
+
+            start_time = timeformat_to_seconds(start_timeformat)
+            end_time = timeformat_to_seconds(end_timeformat)
+
+            samples.append((sample_name, start_time, end_time))
+
+    return samples
+
+
+def usage():
+    print("usage: %s <video_file> <samples_list_file>"
+          % os.path.basename(sys.argv[0]))
+
+
+def main():
+    if len(sys.argv) < 3:
+        usage()
+        return 1
+
+    master_file = sys.argv[1]
+    samples_list_filename = sys.argv[2]
+
+    samples = parse_samples_list(samples_list_filename)
+    for sample_name, start_time, end_time in samples:
+        duration = round(end_time - start_time, 2)
+        clip_filename = CLIP_FILENAME_TEMPLATE % sample_name
+        print("ges-launch-1.0 +clip \"%s\" inpoint=%s duration=%s -o \"%s\" --format=\"%s\"" %
+              (master_file, start_time, duration, clip_filename, CLIP_FORMAT))
+
+
+if __name__ == "__main__":
+    sys.exit(main())