[extractor,utils] Detect more codecs/mimetypes

Fixes: https://github.com/ytdl-org/youtube-dl/issues/29943

yt_dlp/extractor/common.py

@@ -2646,6 +2646,8 @@ class InfoExtractor(object):
                             content_type = mime_type
                         elif codecs.split('.')[0] == 'stpp':
                             content_type = 'text'
+                        elif mimetype2ext(mime_type) in ('tt', 'dfxp', 'ttml', 'xml', 'json'):
+                            content_type = 'text'
                         else:
                             self.report_warning('Unknown MIME type %s in DASH manifest' % mime_type)
                             continue

yt_dlp/utils.py

@@ -4621,7 +4621,7 @@ def parse_codecs(codecs_str):
     vcodec, acodec = None, None
     for full_codec in split_codecs:
         codec = full_codec.split('.')[0]
-        if codec in ('avc1', 'avc2', 'avc3', 'avc4', 'vp9', 'vp8', 'hev1', 'hev2', 'h263', 'h264', 'mp4v', 'hvc1', 'av01', 'theora'):
+        if codec in ('avc1', 'avc2', 'avc3', 'avc4', 'vp9', 'vp8', 'hev1', 'hev2', 'h263', 'h264', 'mp4v', 'hvc1', 'av01', 'theora', 'dvh1', 'dvhe'):
             if not vcodec:
                 vcodec = full_codec
         elif codec in ('mp4a', 'opus', 'vorbis', 'mp3', 'aac', 'ac-3', 'ec-3', 'eac3', 'dtsc', 'dtse', 'dtsh', 'dtsl'):