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	[core] Warn if lack of ffmpeg alters format selection (#9805)
Authored by: seproDev, pukkandan
This commit is contained in:
		| @@ -2136,6 +2136,11 @@ class YoutubeDL: | ||||
| 
 | ||||
|     def _check_formats(self, formats): | ||||
|         for f in formats: | ||||
|             working = f.get('__working') | ||||
|             if working is not None: | ||||
|                 if working: | ||||
|                     yield f | ||||
|                 continue | ||||
|             self.to_screen('[info] Testing format %s' % f['format_id']) | ||||
|             path = self.get_output_path('temp') | ||||
|             if not self._ensure_dir_exists(f'{path}/'): | ||||
| @@ -2152,33 +2157,44 @@ class YoutubeDL: | ||||
|                         os.remove(temp_file.name) | ||||
|                     except OSError: | ||||
|                         self.report_warning('Unable to delete temporary file "%s"' % temp_file.name) | ||||
|             f['__working'] = success | ||||
|             if success: | ||||
|                 yield f | ||||
|             else: | ||||
|                 self.to_screen('[info] Unable to download format %s. Skipping...' % f['format_id']) | ||||
| 
 | ||||
|     def _select_formats(self, formats, selector): | ||||
|         return list(selector({ | ||||
|             'formats': formats, | ||||
|             'has_merged_format': any('none' not in (f.get('acodec'), f.get('vcodec')) for f in formats), | ||||
|             'incomplete_formats': (all(f.get('vcodec') == 'none' for f in formats)  # No formats with video | ||||
|                                    or all(f.get('acodec') == 'none' for f in formats)),  # OR, No formats with audio | ||||
|         })) | ||||
| 
 | ||||
|     def _default_format_spec(self, info_dict, download=True): | ||||
|         download = download and not self.params.get('simulate') | ||||
|         prefer_best = download and ( | ||||
|             self.params['outtmpl']['default'] == '-' | ||||
|             or info_dict.get('is_live') and not self.params.get('live_from_start')) | ||||
| 
 | ||||
|         def can_merge(): | ||||
|             merger = FFmpegMergerPP(self) | ||||
|             return merger.available and merger.can_merge() | ||||
| 
 | ||||
|         prefer_best = ( | ||||
|             not self.params.get('simulate') | ||||
|             and download | ||||
|             and ( | ||||
|                 not can_merge() | ||||
|                 or info_dict.get('is_live') and not self.params.get('live_from_start') | ||||
|                 or self.params['outtmpl']['default'] == '-')) | ||||
|         compat = ( | ||||
|             prefer_best | ||||
|             or self.params.get('allow_multiple_audio_streams', False) | ||||
|             or 'format-spec' in self.params['compat_opts']) | ||||
|         if not prefer_best and download and not can_merge(): | ||||
|             prefer_best = True | ||||
|             formats = self._get_formats(info_dict) | ||||
|             evaluate_formats = lambda spec: self._select_formats(formats, self.build_format_selector(spec)) | ||||
|             if evaluate_formats('b/bv+ba') != evaluate_formats('bv*+ba/b'): | ||||
|                 self.report_warning('ffmpeg not found. The downloaded format may not be the best available. ' | ||||
|                                     'Installing ffmpeg is strongly recommended: https://github.com/yt-dlp/yt-dlp#dependencies') | ||||
| 
 | ||||
|         return ( | ||||
|             'best/bestvideo+bestaudio' if prefer_best | ||||
|             else 'bestvideo*+bestaudio/best' if not compat | ||||
|             else 'bestvideo+bestaudio/best') | ||||
|         compat = (self.params.get('allow_multiple_audio_streams') | ||||
|                   or 'format-spec' in self.params['compat_opts']) | ||||
| 
 | ||||
|         return ('best/bestvideo+bestaudio' if prefer_best | ||||
|                 else 'bestvideo+bestaudio/best' if compat | ||||
|                 else 'bestvideo*+bestaudio/best') | ||||
| 
 | ||||
|     def build_format_selector(self, format_spec): | ||||
|         def syntax_error(note, start): | ||||
| @@ -2928,12 +2944,7 @@ class YoutubeDL: | ||||
|                 self.write_debug(f'Default format spec: {req_format}') | ||||
|                 format_selector = self.build_format_selector(req_format) | ||||
| 
 | ||||
|             formats_to_download = list(format_selector({ | ||||
|                 'formats': formats, | ||||
|                 'has_merged_format': any('none' not in (f.get('acodec'), f.get('vcodec')) for f in formats), | ||||
|                 'incomplete_formats': (all(f.get('vcodec') == 'none' for f in formats)  # No formats with video | ||||
|                                        or all(f.get('acodec') == 'none' for f in formats)),  # OR, No formats with audio | ||||
|             })) | ||||
|             formats_to_download = self._select_formats(formats, format_selector) | ||||
|             if interactive_format_selection and not formats_to_download: | ||||
|                 self.report_error('Requested format is not available', tb=False, is_error=False) | ||||
|                 continue | ||||
|   | ||||
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