X-Git-Url: http://git.cielonegro.org/gitweb.cgi?a=blobdiff_plain;f=youtube_dl%2Fdownloader%2Ff4m.py;h=c460c167a2db78be7a1cdb8e81a3efe89e677ed1;hb=b4a64c592b5f0f547c11c72e6c840612b336de5d;hp=87d3150c705037c4ff520c02e82679805b18b9d4;hpb=3b8f3a1504b46ff6085617ea22e027668d45a503;p=youtube-dl.git

diff --git a/youtube_dl/downloader/f4m.py b/youtube_dl/downloader/f4m.py
index 87d3150c7..c460c167a 100644
--- a/youtube_dl/downloader/f4m.py
+++ b/youtube_dl/downloader/f4m.py
@@ -187,6 +187,14 @@ def build_fragments_list(boot_info):
     return res
 
 
+def write_unsigned_int(stream, val):
+    stream.write(struct_pack('!I', val))
+
+
+def write_unsigned_int_24(stream, val):
+    stream.write(struct_pack('!I', val)[1:])
+
+
 def write_flv_header(stream):
     """Writes the FLV header to stream"""
     # FLV header
@@ -198,16 +206,15 @@ def write_flv_header(stream):
 
 def write_metadata_tag(stream, metadata):
     """Writes optional metadata tag to stream"""
+    SCRIPT_TAG = b'\x12'
+    FLV_TAG_HEADER_LEN = 11
+
     if metadata:
-        # Script data
-        stream.write(b'\x12')
-        # Size of the metadata with 3 bytes
-        stream.write(struct_pack('!L', len(metadata))[1:])
+        stream.write(SCRIPT_TAG)
+        write_unsigned_int_24(stream, len(metadata))
         stream.write(b'\x00\x00\x00\x00\x00\x00\x00')
         stream.write(metadata)
-        # Magic numbers extracted from the output files produced by AdobeHDS.php
-        # (https://github.com/K-S-V/Scripts)
-        stream.write(b'\x00\x00\x01\x73')
+        write_unsigned_int(stream, FLV_TAG_HEADER_LEN + len(metadata))
 
 
 def _add_ns(prop):