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[downloader/ism] Support muxing TTML subtitles

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This commit is contained in:
Felix S 2021-04-18 12:48:39 +02:00
parent 15828bcf25
commit 66a1b8643a
2 changed files with 10 additions and 3 deletions
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11
yt_dlp/downloader/ism.py
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@ -118,8 +118,7 @@ def write_piff_header(stream, params):
vmhd_payload += u16.pack(0) * 3 # opcolor
media_header_box = full_box(b'vmhd', 0, 1, vmhd_payload) # Video Media Header
elif stream_type == 'text':
sthd_payload = u16.pack(0) * 2
media_header_box = full_box(b'sthd', 0, 1, sthd_payload) # Subtitle Media Header
media_header_box = full_box(b'sthd', 0, 0, b'') # Subtitle Media Header
else:
assert False
minf_payload = media_header_box
@ -173,6 +172,14 @@ def write_piff_header(stream, params):
sample_entry_box = box(b'avc1', sample_entry_payload) # AVC Simple Entry
else:
assert False
elif stream_type == 'text':
if fourcc == 'TTML':
sample_entry_payload += b'http://www.w3.org/ns/ttml\0' # namespace
sample_entry_payload += b'\0' # schema location
sample_entry_payload += b'\0' # auxilary mime types(??)
sample_entry_box = box(b'stpp', sample_entry_payload)
else:
assert False
else:
assert False
stsd_payload += sample_entry_box

2
yt_dlp/extractor/common.py
View file

@ -2816,7 +2816,7 @@ def _parse_ism_formats_and_subtitles(self, ism_doc, ism_url, ism_id=None):
for track in stream.findall('QualityLevel'):
fourcc = track.get('FourCC', 'AACL' if track.get('AudioTag') == '255' else None)
# TODO: add support for WVC1 and WMAP
if fourcc not in ('H264', 'AVC1', 'AACL'):
if fourcc not in ('H264', 'AVC1', 'AACL', 'TTML'):
self.report_warning('%s is not a supported codec' % fourcc)
continue
tbr = int(track.attrib['Bitrate']) // 1000