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Warn against using -f mp4 (#13915)

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Authored by: seproDev
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sepro 2025-08-17 00:35:46 +02:00 committed by GitHub
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commit 70f5669951
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yt_dlp/__init__.py
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@ -500,6 +500,14 @@ def metadataparser_actions(f):
'To let yt-dlp download and merge the best available formats, simply do not pass any format selection', 'To let yt-dlp download and merge the best available formats, simply do not pass any format selection',
'If you know what you are doing and want only the best pre-merged format, use "-f b" instead to suppress this warning'))) 'If you know what you are doing and want only the best pre-merged format, use "-f b" instead to suppress this warning')))
# Common mistake: -f mp4
if opts.format == 'mp4':
warnings.append('.\n '.join((
'"-f mp4" selects the best pre-merged mp4 format which is often not what\'s intended',
'Pre-merged mp4 formats are not available from all sites, or may only be available in lower quality',
'To prioritize the best h264 video and aac audio in an mp4 container, use "-t mp4" instead',
'If you know what you are doing and want a pre-merged mp4 format, use "-f b[ext=mp4]" instead to suppress this warning')))
# --(postprocessor/downloader)-args without name # --(postprocessor/downloader)-args without name
def report_args_compat(name, value, key1, key2=None, where=None): def report_args_compat(name, value, key1, key2=None, where=None):
if key1 in value and key2 not in value: if key1 in value and key2 not in value: