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Add Dolby Vision for DASH signaling support. #820

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Merged
barbibulle merged 2 commits into from
Nov 17, 2025
Merged

Add Dolby Vision for DASH signaling support. #820

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ade2f40
Add Dolby Vision for DASH signaling support.
XingzhaoYun Dec 6, 2022
b4c3d98
Merge branch 'master' into dolby/dovi_dash
XingzhaoYun Nov 17, 2025
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59 changes: 50 additions & 9 deletions Source/Python/utils/mp4-dash.py
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Original file line number Diff line number Diff line change
Expand Up @@ -128,6 +128,8 @@

DASH_DEFAULT_ROLE_NAMESPACE = 'urn:mpeg:dash:role:2011'

SCTE_NAMESPACE = 'urn:scte:dash:scte214-extensions'

DASH_MEDIA_SEGMENT_URL_PATTERN_SMOOTH = "/QualityLevels($Bandwidth$)/Fragments(%s=$Time$)"
DASH_MEDIA_SEGMENT_URL_PATTERN_HIPPO = '%s/Bitrate($Bandwidth$)/Fragment($Time$)'

Expand All @@ -141,6 +143,10 @@
DOLBY_DIGITAL_AUDIO_CHANNEL_CONFIGURATION_SCHEME_ID_URI = 'tag:dolby.com,2014:dash:audio_channel_configuration:2011'
DOLBY_AC4_AUDIO_CHANNEL_CONFIGURATION_SCHEME_ID_URI = 'tag:dolby.com,2015:dash:audio_channel_configuration:2015'

MPEG_DASH_MATRIX_COEFFICIENTS_SCHEME_ID_URI = 'urn:mpeg:mpegB:cicp:MatrixCoefficients'
MPEG_DASH_COLOUR_PRIMARIES_SCHEME_ID_URI = 'urn:mpeg:mpegB:cicp:ColourPrimaries'
MPEG_DASH_TRANSFER_CHARACTERISTICS_SCHEME_ID_URI = 'urn:mpeg:mpegB:cicp:TransferCharacteristics'

ISOFF_MAIN_PROFILE = 'urn:mpeg:dash:profile:isoff-main:2011'
ISOFF_LIVE_PROFILE = 'urn:mpeg:dash:profile:isoff-live:2011'
ISOFF_ON_DEMAND_PROFILE = 'urn:mpeg:dash:profile:isoff-on-demand:2011'
Expand Down Expand Up @@ -485,15 +491,50 @@ def OutputDash(options, set_attributes, audio_sets, video_sets, subtitles_sets,
AddSegmentTemplate(options, adaptation_set, init_segment_url, media_segment_url_template_prefix, video_tracks[0], 'video')

for video_track in video_tracks:
representation = xml.SubElement(adaptation_set,
'Representation',
id=video_track.representation_id,
codecs=video_track.codec,
width=str(video_track.width),
height=str(video_track.height),
scanType=video_track.scan_type,
frameRate=video_track.frame_rate_ratio,
bandwidth=str(video_track.bandwidth))
if hasattr(video_track, 'supplemental_codec') and hasattr(video_track, 'supplemental_profile'):
#adding MatrixCoefficients
if hasattr(video_track, 'matrix_coefficients'):
xml.SubElement(adaptation_set,
'EssentialProperty',
schemeIdUri=MPEG_DASH_MATRIX_COEFFICIENTS_SCHEME_ID_URI,
value=video_track.matrix_coefficients)

#adding ColourPrimaries
if hasattr(video_track, 'colour_primaries'):
xml.SubElement(adaptation_set,
'EssentialProperty',
schemeIdUri=MPEG_DASH_COLOUR_PRIMARIES_SCHEME_ID_URI,
value=video_track.colour_primaries)

#adding TransferCharacteristics
if hasattr(video_track, 'transfer_characteristics'):
xml.SubElement(adaptation_set,
'EssentialProperty',
schemeIdUri=MPEG_DASH_TRANSFER_CHARACTERISTICS_SCHEME_ID_URI,
value=video_track.transfer_characteristics)

representation = xml.SubElement(adaptation_set,
'Representation',
id=video_track.representation_id,
codecs=video_track.codec.split(',')[0],
width=str(video_track.width),
height=str(video_track.height),
scanType=video_track.scan_type,
frameRate=video_track.frame_rate_ratio,
bandwidth=str(video_track.bandwidth))
xml.register_namespace('scte214', SCTE_NAMESPACE)
representation.set('{'+SCTE_NAMESPACE+'}supplementalCodecs', video_track.supplemental_codec)
representation.set('{'+SCTE_NAMESPACE+'}supplementalProfiles', video_track.supplemental_profile)
else:
representation = xml.SubElement(adaptation_set,
'Representation',
id=video_track.representation_id,
codecs=video_track.codec,
width=str(video_track.width),
height=str(video_track.height),
scanType=video_track.scan_type,
frameRate=video_track.frame_rate_ratio,
bandwidth=str(video_track.bandwidth))
if hasattr(video_track, 'max_playout_rate'):
representation.set('maxPlayoutRate', video_track.max_playout_rate)

Expand Down
23 changes: 20 additions & 3 deletions Source/Python/utils/mp4utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -427,17 +427,34 @@ def __init__(self, parent, info):
brand = 'db1p'
if brand in self.parent.info['file']['compatible_brands']:
self.dv_brand = brand
else:
print('WARNING: missing brand "db1p" in MP4 file for Dolby Vision Profile 8.1.')
self.supplemental_profile = brand
self.transfer_characteristics = '16'
self.matrix_coefficients = '9'
self.colour_primaries = '9'
elif bl_compatibility_id == 2:
self.video_range = 'SDR'
brand = 'db2g'
if brand in self.parent.info['file']['compatible_brands']:
self.dv_brand = brand
self.supplemental_profile = brand
elif bl_compatibility_id == 4:
self.video_range = 'HLG'
self.matrix_coefficients = '9'
self.colour_primaries = '9'
if 'db4g' in self.parent.info['file']['compatible_brands']:
self.dv_brand = 'db4g'
elif 'db4h' in self.parent.info['file']['compatible_brands']:
self.dv_brand = 'db4h'
brand = 'db4g'
self.dv_brand = brand
self.supplemental_profile = brand
self.transfer_characteristics = '14'
else:
brand = 'db4h'
self.dv_brand = brand
self.supplemental_profile = brand
self.transfer_characteristics = '18'
if 'db4h' not in self.parent.info['file']['compatible_brands']:
print('WARNING: missing brand "db4g" or "db4h" in MP4 file for Dolby Vision Profile 8.4. Will use "db4h" as default.')
else:
PrintErrorAndExit('ERROR: unsupported ccid for Dolby Vision profile 8/9.')
else:
Expand Down
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