Incorrect handling of the --sub-langs "ru-en" parameter (also --sub-langs "ru.*") #494
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I tested the --sub-langs "ru-en" parameter inside the container using this video: https://youtu.be/xairCL9m9ec?si=EWXZxzGG-HbTFDfx But when I send --sub-langs "ru.*" through the YTPTube web interface, I see the following issue in the logs: The “ru-en” subtitle file doesn’t download — only the plain “ru” file is fetched, and that one is rendered incorrectly by most players (Vimu, VLC). However, when I request the list of available subtitles through the YTPTube web interface using --list-subs, the “ru-en” subtitle track does appear in the list: |
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Answered by
arabcoders
Nov 18, 2025
Replies: 1 comment 10 replies
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Looking at the yt-dlp compiled options i.e. the green button {
"command": "--format default --write-thumbnail --convert-thumbnails jpg --write-info-json --embed-info-json --embed-metadata --extractor-args youtube:player_client=web_embedded --windows-filenames --socket-timeout 30 --write-thumbnail --write-info-json --write-auto-subs --write-subs --sub-langs 'ru.*' --format 'bestvideo[height<=480][dynamic_range=SDR][vcodec!^=av01]+worstaudio[language=ru]/bestvideo[height<=480][dynamic_range=SDR][vcodec!^=av01]+worstaudio' --embed-info-json --embed-metadata --embed-thumbnail --embed-subs --convert-thumbnails jpg --sleep-subtitles 5 --verbose --replace-in-metadata pre_process:title '[\\.\\s]+' _ --list-subs --no-simulate --output '%(title).180B [%(extractor)s-%(id)s].%(ext)s' --paths home:/downloads --paths temp:/tmp 'https://youtu.be/xairCL9m9ec?si=EWXZxzGG-HbTFDfx'",
"yt_dlp": {
"format": "bestvideo[height<=480][dynamic_range=SDR][vcodec!^=av01]+worstaudio[language=ru]/bestvideo[height<=480][dynamic_range=SDR][vcodec!^=av01]+worstaudio",
"windowsfilenames": true,
"writeinfojson": true,
"writethumbnail": true,
"writesubtitles": true,
"writeautomaticsub": true,
"listsubtitles": true,
"subtitleslangs": [
"ru.*"
],
"verbose": true,
"socket_timeout": 30,
"extractor_args": {
"youtube": {
"player_client": [
"web_embedded"
]
}
},
"postprocessors": [
{
"key": "MetadataParser",
"actions": [
[
{
"__module__": "yt_dlp.postprocessor.metadataparser",
"__name__": "replacer",
"__qualname__": "MetadataParserPP.replacer",
"__doc__": null,
"__annotations__": {},
"__type_params__": [],
"__wrapped__": {},
"func": {},
"_function_with_repr__repr": null
},
"title",
"[\\.\\s]+",
"_"
]
],
"when": "pre_process"
},
{
"key": "FFmpegThumbnailsConvertor",
"format": "jpg",
"when": "before_dl"
},
{
"key": "FFmpegEmbedSubtitle",
"already_have_subtitle": true
},
{
"key": "FFmpegMetadata",
"add_chapters": true,
"add_metadata": true,
"add_infojson": true
},
{
"key": "EmbedThumbnail",
"already_have_thumbnail": true
}
],
"sleep_interval_subtitles": 5
}
}vs yt-dlp opts { 'simulate': False,
'format': 'bestvideo[height<=480][dynamic_range=SDR][vcodec!^=av01]+worstaudio[language=ru]/bestvideo[height<=480][dynamic_range=SDR][vcodec!^=av01]+worstaudio',
'windowsfilenames': True,
'ignoreerrors': 'only_download',
'retries': 10,
'fragment_retries': 10,
'writeinfojson': True,
'writethumbnail': True,
'writesubtitles': True,
'writeautomaticsub': True,
'listsubtitles': True,
'subtitleslangs': ['ru.*'],
'verbose': True,
'cookiefile': '/config/cookies/cookies_test.txt',
'proxy': 'socks5://192.168.129.100:10808/',
'socket_timeout': 30.0,
'extractor_args': {'youtube': {'player_client': ['web_embedded']}},
'extract_flat': 'discard_in_playlist',
'postprocessors': [ { 'key': 'MetadataParser',
'actions': [ ( yt_dlp.postprocessor.metadataparser.MetadataParserPP.replacer,
'title',
'[\\.\\s]+',
'_')],
'when': 'pre_process'},
{ 'key': 'FFmpegThumbnailsConvertor',
'format': 'jpg',
'when': 'before_dl'},
{ 'key': 'FFmpegEmbedSubtitle',
'already_have_subtitle': True},
{ 'key': 'FFmpegMetadata',
'add_chapters': True,
'add_metadata': True,
'add_infojson': True},
{ 'key': 'EmbedThumbnail',
'already_have_thumbnail': True},
{ 'key': 'FFmpegConcat',
'only_multi_video': True,
'when': 'playlist'}],
'sleep_interval_subtitles': 5}looks identical minus the forced conversion due to json vs python object |
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10 replies
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As you can see from the debug log. {
"paths": {"home": "/downloads/YT_vp9_480p", "temp": "/tmp"},
"outtmpl": {
"default": "%(title)s.%(ext)s",
"chapter": "%(title)s - %(section_number)s %(section_title)s.%(ext)s",
},
"cookiefile": "/config/cookies/3648192a-459d-4e79-99c8-73811ef943b3.txt",
"format": "bestvideo[height<=480][dynamic_range=SDR][vcodec!^=av01]+worstaudio[language=ru]/bestvideo[height<=480][dynamic_range=SDR][vcodec!^=av01]+worstaudio",
"windowsfilenames": True,
"writeinfojson": True,
"writethumbnail": True,
"writesubtitles": True,
"writeautomaticsub": True,
"subtitleslangs": ["ru-en"],
"verbose": True,
"download_archive": "/config/archive.log",
"proxy": "socks5://192.168.129.100:10808/",
"socket_timeout": 30.0,
"extractor_args": {"youtube": {"player_client": ["web_embedded"]}},
"postprocessors": [
{
"key": "MetadataParser",
"actions": [
(
yt_dlp.postprocessor.metadataparser.MetadataParserPP.replacer,
"title",
"[\\.\\s]+",
"_",
)
],
"when": "pre_process",
},
{"key": "FFmpegSubtitlesConvertor", "format": "srt", "when": "before_dl"},
{"key": "FFmpegThumbnailsConvertor", "format": "jpg", "when": "before_dl"},
{"key": "FFmpegEmbedSubtitle", "already_have_subtitle": True},
{
"key": "FFmpegMetadata",
"add_chapters": True,
"add_metadata": True,
"add_infojson": True,
},
{"key": "EmbedThumbnail", "already_have_thumbnail": True},
],
"sleep_interval_subtitles": 5,
}we are passing exactly what you wrote. I am not sure why it's not working for your specific language string |
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I tested the --sub-langs 'ru-en' command again inside the container. The subtitles were downloaded without any issues. The problem is somewhere in YTPTube. |
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I have a question regarding the syntax of --sub-langs. My questions are: Is it possible that the parser in YTPTube splits "ru-en" into "ru" and "en" instead of treating it as a single language code? |
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No it's not possible as you can see from the log, however the early extraction might be the issue, Anyway once bb59e25 is built try it in dev branch. With this change i was able to get so i assume it's fixes the issue. https://github.com/arabcoders/ytptube/actions/runs/19477069306 |
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Answer selected by
arabcoders
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So, the key to understanding the root cause of the issue was the 'extract_flat': True in the logs? |
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No, most likely as we were stripping |
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Yes, this fix worked. Thank you. |
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No it's not possible as you can see from the log, however the early extraction might be the issue, Anyway once bb59e25 is built try it in dev branch.
With this change i was able to get
so i assume it's fixes the issue. https://github.com/arabcoders/ytptube/actions/runs/19477069306