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-rw-r--r--youtube_dl/downloader/external.py9
1 files changed, 9 insertions, 0 deletions
diff --git a/youtube_dl/downloader/external.py b/youtube_dl/downloader/external.py
index 138f353ef..41e37261d 100644
--- a/youtube_dl/downloader/external.py
+++ b/youtube_dl/downloader/external.py
@@ -199,6 +199,15 @@ class FFmpegFD(ExternalFD):
args = [ffpp.executable, '-y']
+ seekable = info_dict.get('_seekable')
+ if seekable is not None:
+ # setting -seekable prevents ffmpeg from guessing if the server
+ # supports seeking(by adding the header `Range: bytes=0-`), which
+ # can cause problems in some cases
+ # https://github.com/rg3/youtube-dl/issues/11800#issuecomment-275037127
+ # http://trac.ffmpeg.org/ticket/6125#comment:10
+ args += ['-seekable', '1' if seekable else '0']
+
args += self._configuration_args()
# start_time = info_dict.get('start_time') or 0