Repository: yt-dlp/yt-dlp

Issue:
[Feature Request] Add support for ec-3, dtsc
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## Checklist

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- First of, make sure you are using the latest version of yt-dlp. Run `yt-dlp --version` and ensure your version is 2021.04.22. If it's not, see https://github.com/yt-dlp/yt-dlp on how to update. Issues with outdated version will be REJECTED.
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- [x] I'm reporting a feature request
- [x] I've verified that I'm running yt-dlp version **2021.04.22**
- [x] I've searched the bugtracker for similar feature requests including closed ones


## Description

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Provide an explanation of your issue in an arbitrary form. Please make sure the description is worded well enough to be understood, see https://github.com/ytdl-org/youtube-dl#is-the-description-of-the-issue-itself-sufficient. Provide any additional information, suggested solution and as much context and examples as possible.
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Hello.
Please add support for ec-3, dtsc.

yt-dlp.exe --allow-unplayable-formats -F "http://prod-stpeter-mss.verizon.cdn.rakuten.tv/1/4/7/147569feb106401d61f0a677799acd3d-mc-0-139-0-0_DS2/stream.ism/Manifest"

yt-dlp.exe -F "https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest"

WARNING: [generic] EC-3 is not a supported codec
WARNING: [generic] dtsc is not a supported codec
[Feature Request] Add support for ec-3, dtsc
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  WARNING!
  IGNORING THE FOLLOWING TEMPLATE WILL RESULT IN ISSUE CLOSED AS INCOMPLETE
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## Checklist

<!--
Carefully read and work through this check list in order to prevent the most common mistakes and misuse of yt-dlp:
- First of, make sure you are using the latest version of yt-dlp. Run `yt-dlp --version` and ensure your version is 2021.04.22. If it's not, see https://github.com/yt-dlp/yt-dlp on how to update. Issues with outdated version will be REJECTED.
- Search the bugtracker for similar feature requests: https://github.com/yt-dlp/yt-dlp. DO NOT post duplicates.
- Finally, put x into all relevant boxes like this [x] (Dont forget to delete the empty space)
-->

- [x] I'm reporting a feature request
- [x] I've verified that I'm running yt-dlp version **2021.04.22**
- [x] I've searched the bugtracker for similar feature requests including closed ones


## Description

<!--
Provide an explanation of your issue in an arbitrary form. Please make sure the description is worded well enough to be understood, see https://github.com/ytdl-org/youtube-dl#is-the-description-of-the-issue-itself-sufficient. Provide any additional information, suggested solution and as much context and examples as possible.
-->

Hello.
Please add support for ec-3, dtsc.

yt-dlp.exe --allow-unplayable-formats -F "http://prod-stpeter-mss.verizon.cdn.rakuten.tv/1/4/7/147569feb106401d61f0a677799acd3d-mc-0-139-0-0_DS2/stream.ism/Manifest"

yt-dlp.exe -F "https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest"

WARNING: [generic] EC-3 is not a supported codec
WARNING: [generic] dtsc is not a supported codec


Discussion:
Give non-DRM example
The second link is DRM-free, but alas, only for ec-3.

https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest
Related: https://github.com/ytdl-org/youtube-dl/issues/20968
Give non-DRM example
The second link is DRM-free, but alas, only for ec-3.

https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest
Related: https://github.com/ytdl-org/youtube-dl/issues/20968

Resolving patch:
diff --git a/yt_dlp/downloader/ism.py b/yt_dlp/downloader/ism.py
--- a/yt_dlp/downloader/ism.py
+++ b/yt_dlp/downloader/ism.py
@@ -138,6 +138,8 @@ def write_piff_header(stream, params):
 
         if fourcc == 'AACL':
             sample_entry_box = box(b'mp4a', sample_entry_payload)
+        if fourcc == 'EC-3':
+            sample_entry_box = box(b'ec-3', sample_entry_payload)
     elif stream_type == 'video':
         sample_entry_payload += u16.pack(0)  # pre defined
         sample_entry_payload += u16.pack(0)  # reserved
diff --git a/yt_dlp/extractor/common.py b/yt_dlp/extractor/common.py
--- a/yt_dlp/extractor/common.py
+++ b/yt_dlp/extractor/common.py
@@ -3116,9 +3116,10 @@ def _parse_ism_formats_and_subtitles(self, ism_doc, ism_url, ism_id=None):
             stream_name = stream.get('Name')
             stream_language = stream.get('Language', 'und')
             for track in stream.findall('QualityLevel'):
-                fourcc = track.get('FourCC') or ('AACL' if track.get('AudioTag') == '255' else None)
+                KNOWN_TAGS = {'255': 'AACL', '65534': 'EC-3'}
+                fourcc = track.get('FourCC') or KNOWN_TAGS.get(track.get('AudioTag'))
                 # TODO: add support for WVC1 and WMAP
-                if fourcc not in ('H264', 'AVC1', 'AACL', 'TTML'):
+                if fourcc not in ('H264', 'AVC1', 'AACL', 'TTML', 'EC-3'):
                     self.report_warning('%s is not a supported codec' % fourcc)
                     continue
                 tbr = int(track.attrib['Bitrate']) // 1000
diff --git a/yt_dlp/utils.py b/yt_dlp/utils.py
--- a/yt_dlp/utils.py
+++ b/yt_dlp/utils.py
@@ -3533,7 +3533,7 @@ def get_compatible_ext(*, vcodecs, acodecs, vexts, aexts, preferences=None):
     COMPATIBLE_CODECS = {
         'mp4': {
             'av1', 'hevc', 'avc1', 'mp4a',  # fourcc (m3u8, mpd)
-            'h264', 'aacl',  # Set in ISM
+            'h264', 'aacl', 'ec-3',  # Set in ISM
         },
         'webm': {
             'av1', 'vp9', 'vp8', 'opus', 'vrbs',


Test patch:
diff --git a/test/test_InfoExtractor.py b/test/test_InfoExtractor.py
--- a/test/test_InfoExtractor.py
+++ b/test/test_InfoExtractor.py
@@ -1567,6 +1567,292 @@ def test_parse_ism_formats(self):
                     ]
                 },
             ),
+            (
+                'ec-3_test',
+                'https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest',
+                [{
+                    'format_id': 'audio_deu_1-224',
+                    'url': 'https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest',
+                    'manifest_url': 'https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest',
+                    'ext': 'isma',
+                    'tbr': 224,
+                    'asr': 48000,
+                    'vcodec': 'none',
+                    'acodec': 'EC-3',
+                    'protocol': 'ism',
+                    '_download_params':
+                    {
+                        'stream_type': 'audio',
+                        'duration': 370000000,
+                        'timescale': 10000000,
+                        'width': 0,
+                        'height': 0,
+                        'fourcc': 'EC-3',
+                        'language': 'deu',
+                        'codec_private_data': '00063F000000AF87FBA7022DFB42A4D405CD93843BDD0700200F00',
+                        'sampling_rate': 48000,
+                        'channels': 6,
+                        'bits_per_sample': 16,
+                        'nal_unit_length_field': 4
+                    },
+                    'audio_ext': 'isma',
+                    'video_ext': 'none',
+                    'abr': 224,
+                }, {
+                    'format_id': 'audio_deu-127',
+                    'url': 'https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest',
+                    'manifest_url': 'https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest',
+                    'ext': 'isma',
+                    'tbr': 127,
+                    'asr': 48000,
+                    'vcodec': 'none',
+                    'acodec': 'AACL',
+                    'protocol': 'ism',
+                    '_download_params':
+                    {
+                        'stream_type': 'audio',
+                        'duration': 370000000,
+                        'timescale': 10000000,
+                        'width': 0,
+                        'height': 0,
+                        'fourcc': 'AACL',
+                        'language': 'deu',
+                        'codec_private_data': '1190',
+                        'sampling_rate': 48000,
+                        'channels': 2,
+                        'bits_per_sample': 16,
+                        'nal_unit_length_field': 4
+                    },
+                    'audio_ext': 'isma',
+                    'video_ext': 'none',
+                    'abr': 127,
+                }, {
+                    'format_id': 'video_deu-23',
+                    'url': 'https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest',
+                    'manifest_url': 'https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest',
+                    'ext': 'ismv',
+                    'width': 384,
+                    'height': 216,
+                    'tbr': 23,
+                    'vcodec': 'AVC1',
+                    'acodec': 'none',
+                    'protocol': 'ism',
+                    '_download_params':
+                    {
+                        'stream_type': 'video',
+                        'duration': 370000000,
+                        'timescale': 10000000,
+                        'width': 384,
+                        'height': 216,
+                        'fourcc': 'AVC1',
+                        'language': 'deu',
+                        'codec_private_data': '000000016742C00CDB06077E5C05A808080A00000300020000030009C0C02EE0177CC6300F142AE00000000168CA8DC8',
+                        'channels': 2,
+                        'bits_per_sample': 16,
+                        'nal_unit_length_field': 4
+                    },
+                    'video_ext': 'ismv',
+                    'audio_ext': 'none',
+                    'vbr': 23,
+                }, {
+                    'format_id': 'video_deu-403',
+                    'url': 'https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest',
+                    'manifest_url': 'https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest',
+                    'ext': 'ismv',
+                    'width': 400,
+                    'height': 224,
+                    'tbr': 403,
+                    'vcodec': 'AVC1',
+                    'acodec': 'none',
+                    'protocol': 'ism',
+                    '_download_params':
+                    {
+                        'stream_type': 'video',
+                        'duration': 370000000,
+                        'timescale': 10000000,
+                        'width': 400,
+                        'height': 224,
+                        'fourcc': 'AVC1',
+                        'language': 'deu',
+                        'codec_private_data': '00000001674D4014E98323B602D4040405000003000100000300320F1429380000000168EAECF2',
+                        'channels': 2,
+                        'bits_per_sample': 16,
+                        'nal_unit_length_field': 4
+                    },
+                    'video_ext': 'ismv',
+                    'audio_ext': 'none',
+                    'vbr': 403,
+                }, {
+                    'format_id': 'video_deu-680',
+                    'url': 'https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest',
+                    'manifest_url': 'https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest',
+                    'ext': 'ismv',
+                    'width': 640,
+                    'height': 360,
+                    'tbr': 680,
+                    'vcodec': 'AVC1',
+                    'acodec': 'none',
+                    'protocol': 'ism',
+                    '_download_params':
+                    {
+                        'stream_type': 'video',
+                        'duration': 370000000,
+                        'timescale': 10000000,
+                        'width': 640,
+                        'height': 360,
+                        'fourcc': 'AVC1',
+                        'language': 'deu',
+                        'codec_private_data': '00000001674D401EE981405FF2E02D4040405000000300100000030320F162D3800000000168EAECF2',
+                        'channels': 2,
+                        'bits_per_sample': 16,
+                        'nal_unit_length_field': 4
+                    },
+                    'video_ext': 'ismv',
+                    'audio_ext': 'none',
+                    'vbr': 680,
+                }, {
+                    'format_id': 'video_deu-1253',
+                    'url': 'https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest',
+                    'manifest_url': 'https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest',
+                    'ext': 'ismv',
+                    'width': 640,
+                    'height': 360,
+                    'tbr': 1253,
+                    'vcodec': 'AVC1',
+                    'acodec': 'none',
+                    'protocol': 'ism',
+                    '_download_params':
+                    {
+                        'stream_type': 'video',
+                        'duration': 370000000,
+                        'timescale': 10000000,
+                        'width': 640,
+                        'height': 360,
+                        'fourcc': 'AVC1',
+                        'language': 'deu',
+                        'codec_private_data': '00000001674D401EE981405FF2E02D4040405000000300100000030320F162D3800000000168EAECF2',
+                        'channels': 2,
+                        'bits_per_sample': 16,
+                        'nal_unit_length_field': 4
+                    },
+                    'video_ext': 'ismv',
+                    'audio_ext': 'none',
+                    'vbr': 1253,
+                }, {
+                    'format_id': 'video_deu-2121',
+                    'url': 'https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest',
+                    'manifest_url': 'https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest',
+                    'ext': 'ismv',
+                    'width': 768,
+                    'height': 432,
+                    'tbr': 2121,
+                    'vcodec': 'AVC1',
+                    'acodec': 'none',
+                    'protocol': 'ism',
+                    '_download_params':
+                    {
+                        'stream_type': 'video',
+                        'duration': 370000000,
+                        'timescale': 10000000,
+                        'width': 768,
+                        'height': 432,
+                        'fourcc': 'AVC1',
+                        'language': 'deu',
+                        'codec_private_data': '00000001674D401EECA0601BD80B50101014000003000400000300C83C58B6580000000168E93B3C80',
+                        'channels': 2,
+                        'bits_per_sample': 16,
+                        'nal_unit_length_field': 4
+                    },
+                    'video_ext': 'ismv',
+                    'audio_ext': 'none',
+                    'vbr': 2121,
+                }, {
+                    'format_id': 'video_deu-3275',
+                    'url': 'https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest',
+                    'manifest_url': 'https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest',
+                    'ext': 'ismv',
+                    'width': 1280,
+                    'height': 720,
+                    'tbr': 3275,
+                    'vcodec': 'AVC1',
+                    'acodec': 'none',
+                    'protocol': 'ism',
+                    '_download_params':
+                    {
+                        'stream_type': 'video',
+                        'duration': 370000000,
+                        'timescale': 10000000,
+                        'width': 1280,
+                        'height': 720,
+                        'fourcc': 'AVC1',
+                        'language': 'deu',
+                        'codec_private_data': '00000001674D4020ECA02802DD80B501010140000003004000000C83C60C65800000000168E93B3C80',
+                        'channels': 2,
+                        'bits_per_sample': 16,
+                        'nal_unit_length_field': 4
+                    },
+                    'video_ext': 'ismv',
+                    'audio_ext': 'none',
+                    'vbr': 3275,
+                }, {
+                    'format_id': 'video_deu-5300',
+                    'url': 'https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest',
+                    'manifest_url': 'https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest',
+                    'ext': 'ismv',
+                    'width': 1920,
+                    'height': 1080,
+                    'tbr': 5300,
+                    'vcodec': 'AVC1',
+                    'acodec': 'none',
+                    'protocol': 'ism',
+                    '_download_params':
+                    {
+                        'stream_type': 'video',
+                        'duration': 370000000,
+                        'timescale': 10000000,
+                        'width': 1920,
+                        'height': 1080,
+                        'fourcc': 'AVC1',
+                        'language': 'deu',
+                        'codec_private_data': '00000001674D4028ECA03C0113F2E02D4040405000000300100000030320F18319600000000168E93B3C80',
+                        'channels': 2,
+                        'bits_per_sample': 16,
+                        'nal_unit_length_field': 4
+                    },
+                    'video_ext': 'ismv',
+                    'audio_ext': 'none',
+                    'vbr': 5300,
+                }, {
+                    'format_id': 'video_deu-8079',
+                    'url': 'https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest',
+                    'manifest_url': 'https://smstr01.dmm.t-online.de/smooth24/smoothstream_m1/streaming/sony/9221438342941275747/636887760842957027/25_km_h-Trailer-9221571562372022953_deu_20_1300k_HD_H_264_ISMV.ism/Manifest',
+                    'ext': 'ismv',
+                    'width': 1920,
+                    'height': 1080,
+                    'tbr': 8079,
+                    'vcodec': 'AVC1',
+                    'acodec': 'none',
+                    'protocol': 'ism',
+                    '_download_params':
+                    {
+                        'stream_type': 'video',
+                        'duration': 370000000,
+                        'timescale': 10000000,
+                        'width': 1920,
+                        'height': 1080,
+                        'fourcc': 'AVC1',
+                        'language': 'deu',
+                        'codec_private_data': '00000001674D4028ECA03C0113F2E02D4040405000000300100000030320F18319600000000168E93B3C80',
+                        'channels': 2,
+                        'bits_per_sample': 16,
+                        'nal_unit_length_field': 4
+                    },
+                    'video_ext': 'ismv',
+                    'audio_ext': 'none',
+                    'vbr': 8079,
+                }],
+                {},
+            ),
         ]
 
         for ism_file, ism_url, expected_formats, expected_subtitles in _TEST_CASES:
diff --git a/test/testdata/ism/ec-3_test.Manifest b/test/testdata/ism/ec-3_test.Manifest
new file mode 100644
--- /dev/null
+++ b/test/testdata/ism/ec-3_test.Manifest
@@ -0,0 +1 @@
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