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-rw-r--r--yt_dlp/YoutubeDL.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/yt_dlp/YoutubeDL.py b/yt_dlp/YoutubeDL.py
index 071f2e943..8c8cf7ecb 100644
--- a/yt_dlp/YoutubeDL.py
+++ b/yt_dlp/YoutubeDL.py
@@ -2330,6 +2330,10 @@ class YoutubeDL(object):
format['resolution'] = self.format_resolution(format, default=None)
if format.get('dynamic_range') is None and format.get('vcodec') != 'none':
format['dynamic_range'] = 'SDR'
+ if (info_dict.get('duration') and format.get('tbr')
+ and not format.get('filesize') and not format.get('filesize_approx')):
+ format['filesize_approx'] = info_dict['duration'] * format['tbr'] * (1024 / 8)
+
# Add HTTP headers, so that external programs can use them from the
# json output
full_format_info = info_dict.copy()