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-rw-r--r--youtube_dl/downloader/f4m.py10
1 files changed, 7 insertions, 3 deletions
diff --git a/youtube_dl/downloader/f4m.py b/youtube_dl/downloader/f4m.py
index 87d3150c7..744bf91cb 100644
--- a/youtube_dl/downloader/f4m.py
+++ b/youtube_dl/downloader/f4m.py
@@ -187,6 +187,10 @@ def build_fragments_list(boot_info):
return res
+def write_unsigned_int(stream, val):
+ stream.write(struct_pack('!I', val))
+
+
def write_flv_header(stream):
"""Writes the FLV header to stream"""
# FLV header
@@ -198,6 +202,8 @@ def write_flv_header(stream):
def write_metadata_tag(stream, metadata):
"""Writes optional metadata tag to stream"""
+ FLV_TAG_HEADER_LEN = 11
+
if metadata:
# Script data
stream.write(b'\x12')
@@ -205,9 +211,7 @@ def write_metadata_tag(stream, metadata):
stream.write(struct_pack('!L', len(metadata))[1:])
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):