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[FfmpegMetadata] Allow setting metadata of individual streams 

Closes #877
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pukkandan 2022-01-02 03:31:49 +05:30
parent 1797b073ed
commit 8896899216
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2 changed files with 18 additions and 13 deletions
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2
README.md
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@ -1547,7 +1547,7 @@ Note that any field created by this can be used in the [output template](#output
This option also has a few special uses: This option also has a few special uses:
* You can download an additional URL based on the metadata of the currently downloaded video. To do this, set the field `additional_urls` to the URL that you want to download. Eg: `--parse-metadata "description:(?P<additional_urls>https?://www\.vimeo\.com/\d+)` will download the first vimeo video found in the description * You can download an additional URL based on the metadata of the currently downloaded video. To do this, set the field `additional_urls` to the URL that you want to download. Eg: `--parse-metadata "description:(?P<additional_urls>https?://www\.vimeo\.com/\d+)` will download the first vimeo video found in the description
* You can use this to change the metadata that is embedded in the media file. To do this, set the value of the corresponding field with a `meta_` prefix. For example, any value you set to `meta_description` field will be added to the `description` field in the file. For example, you can use this to set a different "description" and "synopsis". Any value set to the `meta_` field will overwrite all default values. * You can use this to change the metadata that is embedded in the media file. To do this, set the value of the corresponding field with a `meta_` prefix. For example, any value you set to `meta_description` field will be added to the `description` field in the file. For example, you can use this to set a different "description" and "synopsis". To modify the metadata of individual streams, use the `meta<n>_` prefix (Eg: `meta1_language`). Any value set to the `meta_` field will overwrite all default values.
For reference, these are the fields yt-dlp adds by default to the file metadata: For reference, these are the fields yt-dlp adds by default to the file metadata:

29
yt_dlp/postprocessor/ffmpeg.py
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@ -1,5 +1,6 @@
from __future__ import unicode_literals from __future__ import unicode_literals
import collections
import io import io
import itertools import itertools
import os import os
@ -728,15 +729,15 @@ class FFmpegMetadataPP(FFmpegPostProcessor):
yield ('-map_metadata', '1') yield ('-map_metadata', '1')
def _get_metadata_opts(self, info): def _get_metadata_opts(self, info):
metadata = {} meta_prefix = 'meta'
meta_prefix = 'meta_' metadata = collections.defaultdict(dict)
def add(meta_list, info_list=None): def add(meta_list, info_list=None):
value = next(( value = next((
str(info[key]) for key in [meta_prefix] + list(variadic(info_list or meta_list)) str(info[key]) for key in [f'{meta_prefix}_'] + list(variadic(info_list or meta_list))
if info.get(key) is not None), None) if info.get(key) is not None), None)
if value not in ('', None): if value not in ('', None):
metadata.update({meta_f: value for meta_f in variadic(meta_list)}) metadata['common'].update({meta_f: value for meta_f in variadic(meta_list)})
# See [1-4] for some info on media metadata/metadata supported # See [1-4] for some info on media metadata/metadata supported
# by ffmpeg. # by ffmpeg.
@ -760,22 +761,26 @@ class FFmpegMetadataPP(FFmpegPostProcessor):
add('episode_sort', 'episode_number') add('episode_sort', 'episode_number')
if 'embed-metadata' in self.get_param('compat_opts', []): if 'embed-metadata' in self.get_param('compat_opts', []):
add('comment', 'description') add('comment', 'description')
metadata.pop('synopsis', None) metadata['common'].pop('synopsis', None)
meta_regex = rf'{re.escape(meta_prefix)}(?P<i>\d+)?_(?P<key>.+)'
for key, value in info.items(): for key, value in info.items():
if value is not None and key != meta_prefix and key.startswith(meta_prefix): mobj = re.fullmatch(meta_regex, key)
metadata[key[len(meta_prefix):]] = value if value is not None and mobj:
metadata[mobj.group('i') or 'common'][mobj.group('key')] = value
for name, value in metadata.items(): for name, value in metadata['common'].items():
yield ('-metadata', f'{name}={value}') yield ('-metadata', f'{name}={value}')
stream_idx = 0 stream_idx = 0
for fmt in info.get('requested_formats') or []: for fmt in info.get('requested_formats') or []:
stream_count = 2 if 'none' not in (fmt.get('vcodec'), fmt.get('acodec')) else 1 stream_count = 2 if 'none' not in (fmt.get('vcodec'), fmt.get('acodec')) else 1
if fmt.get('language'): lang = ISO639Utils.short2long(fmt['language']) or fmt.get('language')
lang = ISO639Utils.short2long(fmt['language']) or fmt['language'] for i in range(stream_idx, stream_idx + stream_count):
for i in range(stream_count): if lang:
yield ('-metadata:s:%d' % (stream_idx + i), 'language=%s' % lang) metadata[str(i)].setdefault('language', lang)
for name, value in metadata[str(i)].items():
yield (f'-metadata:s:{i}', f'{name}={value}')
stream_idx += stream_count stream_idx += stream_count
def _get_infojson_opts(self, info, infofn): def _get_infojson_opts(self, info, infofn):