[downloader/ffmpeg] Support for DASH manifests (experimental)

Closes #159

yt_dlp/downloader/__init__.py

@@ -94,6 +94,10 @@ def _get_suitable_downloader(info_dict, params, default):
         if ed.can_download(info_dict, external_downloader):
             return ed
 
+    if protocol == 'http_dash_segments':
+        if info_dict.get('is_live') and external_downloader.lower() != 'native':
+            return FFmpegFD
+
     if protocol in ('m3u8', 'm3u8_native'):
         if info_dict.get('is_live'):
             return FFmpegFD

yt_dlp/downloader/external.py

@@ -342,7 +342,7 @@ class HttpieFD(ExternalFD):
 
 
 class FFmpegFD(ExternalFD):
-    SUPPORTED_PROTOCOLS = ('http', 'https', 'ftp', 'ftps', 'm3u8', 'm3u8_native', 'rtsp', 'rtmp', 'rtmp_ffmpeg', 'mms')
+    SUPPORTED_PROTOCOLS = ('http', 'https', 'ftp', 'ftps', 'm3u8', 'm3u8_native', 'rtsp', 'rtmp', 'rtmp_ffmpeg', 'mms', 'http_dash_segments')
     can_download_to_stdout = True
 
     @classmethod
@@ -462,12 +462,11 @@ class FFmpegFD(ExternalFD):
             args += self._configuration_args((f'_i{i + 1}', '_i')) + ['-i', url]
 
         args += ['-c', 'copy']
-        if info_dict.get('requested_formats'):
-            for (i, fmt) in enumerate(info_dict['requested_formats']):
-                if fmt.get('acodec') != 'none':
-                    args.extend(['-map', '%d:a:0' % i])
-                if fmt.get('vcodec') != 'none':
-                    args.extend(['-map', '%d:v:0' % i])
+        if info_dict.get('requested_formats') or protocol == 'http_dash_segments':
+            for (i, fmt) in enumerate(info_dict.get('requested_formats') or [info_dict]):
+                stream_number = fmt.get('manifest_stream_number', 0)
+                a_or_v = 'a' if fmt.get('acodec') != 'none' else 'v'
+                args.extend(['-map', f'{i}:{a_or_v}:{stream_number}'])
 
         if self.params.get('test', False):
             args += ['-fs', compat_str(self._TEST_FILE_SIZE)]
@@ -490,7 +489,7 @@ class FFmpegFD(ExternalFD):
         else:
             args += ['-f', EXT_TO_OUT_FORMATS.get(ext, ext)]
 
-        args += self._configuration_args((f'_o1', '_o', ''))
+        args += self._configuration_args(('_o1', '_o', ''))
 
         args = [encodeArgument(opt) for opt in args]
         args.append(encodeFilename(ffpp._ffmpeg_filename_argument(tmpfilename), True))

yt_dlp/extractor/common.py

@@ -2584,8 +2584,8 @@ class InfoExtractor(object):
             return ms_info
 
         mpd_duration = parse_duration(mpd_doc.get('mediaPresentationDuration'))
-        formats = []
-        subtitles = {}
+        formats, subtitles = [], {}
+        stream_numbers = {'audio': 0, 'video': 0}
         for period in mpd_doc.findall(_add_ns('Period')):
             period_duration = parse_duration(period.get('duration')) or mpd_duration
             period_ms_info = extract_multisegment_info(period, {
@@ -2647,8 +2647,10 @@ class InfoExtractor(object):
                             'format_note': 'DASH %s' % content_type,
                             'filesize': filesize,
                             'container': mimetype2ext(mime_type) + '_dash',
+                            'manifest_stream_number': stream_numbers[content_type]
                         }
                         f.update(parse_codecs(codecs))
+                        stream_numbers[content_type] += 1
                     elif content_type == 'text':
                         f = {
                             'ext': mimetype2ext(mime_type),

yt_dlp/utils.py

@@ -4987,6 +4987,7 @@ def cli_configuration_args(argdict, keys, default=[], use_compat=True):
             return [arg for args in arg_list for arg in args]
     return default
 
+
 def _configuration_args(main_key, argdict, exe, keys=None, default=[], use_compat=True):
     main_key, exe = main_key.lower(), exe.lower()
     root_key = exe if main_key == exe else f'{main_key}+{exe}'