问题
I am trying to download closed captions for this public youtube video (just for testing) https://www.youtube.com/watch?v=Txvud7wPbv4
I am using the code sample(captions.py) below that i got from this link https://developers.google.com/youtube/v3/docs/captions/download
I have already stored the client-secrets.json(oauth2 authentification) and youtube-v3-api-captions.json in the same directory (asked in the sample code)
I put this code line in cmd : python captions.py --videoid='Txvud7wPbv4' --action='download'
I get this error: I don't know why it doesn't recognise the video id of this public video.
Anyone had the a similar issue ?
Thank you all in advance.
Code sample:
# Usage example:
# python captions.py --videoid='<video_id>' --name='<name>' --file='<file>' --language='<language>' --action='action'
import httplib2
import os
import sys
from apiclient.discovery import build_from_document
from apiclient.errors import HttpError
from oauth2client.client import flow_from_clientsecrets
from oauth2client.file import Storage
from oauth2client.tools import argparser, run_flow
# The CLIENT_SECRETS_FILE variable specifies the name of a file that contains
# the OAuth 2.0 information for this application, including its client_id and
# client_secret. You can acquire an OAuth 2.0 client ID and client secret from
# the {{ Google Cloud Console }} at
# {{ https://cloud.google.com/console }}.
# Please ensure that you have enabled the YouTube Data API for your project.
# For more information about using OAuth2 to access the YouTube Data API, see:
# https://developers.google.com/youtube/v3/guides/authentication
# For more information about the client_secrets.json file format, see:
# https://developers.google.com/api-client-library/python/guide/aaa_client_secrets
CLIENT_SECRETS_FILE = "client_secrets.json"
# This OAuth 2.0 access scope allows for full read/write access to the
# authenticated user's account and requires requests to use an SSL connection.
YOUTUBE_READ_WRITE_SSL_SCOPE = "https://www.googleapis.com/auth/youtube.force-ssl"
YOUTUBE_API_SERVICE_NAME = "youtube"
YOUTUBE_API_VERSION = "v3"
# This variable defines a message to display if the CLIENT_SECRETS_FILE is
# missing.
MISSING_CLIENT_SECRETS_MESSAGE = """
WARNING: Please configure OAuth 2.0
To make this sample run you will need to populate the client_secrets.json file
found at:
%s
with information from the APIs Console
https://console.developers.google.com
For more information about the client_secrets.json file format, please visit:
https://developers.google.com/api-client-library/python/guide/aaa_client_secrets
""" % os.path.abspath(os.path.join(os.path.dirname(__file__),
CLIENT_SECRETS_FILE))
# Authorize the request and store authorization credentials.
def get_authenticated_service(args):
flow = flow_from_clientsecrets(CLIENT_SECRETS_FILE, scope=YOUTUBE_READ_WRITE_SSL_SCOPE,
message=MISSING_CLIENT_SECRETS_MESSAGE)
storage = Storage("%s-oauth2.json" % sys.argv[0])
credentials = storage.get()
if credentials is None or credentials.invalid:
credentials = run_flow(flow, storage, args)
# Trusted testers can download this discovery document from the developers page
# and it should be in the same directory with the code.
with open("youtube-v3-api-captions.json", "r") as f:
doc = f.read()
return build_from_document(doc, http=credentials.authorize(httplib2.Http()))
# Call the API's captions.list method to list the existing caption tracks.
def list_captions(youtube, video_id):
results = youtube.captions().list(
part="snippet",
videoId=video_id
).execute()
for item in results["items"]:
id = item["id"]
name = item["snippet"]["name"]
language = item["snippet"]["language"]
print "Caption track '%s(%s)' in '%s' language." % (name, id, language)
return results["items"]
# Call the API's captions.insert method to upload a caption track in draft status.
def upload_caption(youtube, video_id, language, name, file):
insert_result = youtube.captions().insert(
part="snippet",
body=dict(
snippet=dict(
videoId=video_id,
language=language,
name=name,
isDraft=True
)
),
media_body=file
).execute()
id = insert_result["id"]
name = insert_result["snippet"]["name"]
language = insert_result["snippet"]["language"]
status = insert_result["snippet"]["status"]
print "Uploaded caption track '%s(%s) in '%s' language, '%s' status." % (name,
id, language, status)
# Call the API's captions.update method to update an existing caption track's draft status
# and publish it. If a new binary file is present, update the track with the file as well.
def update_caption(youtube, caption_id, file):
update_result = youtube.captions().update(
part="snippet",
body=dict(
id=caption_id,
snippet=dict(
isDraft=False
)
),
media_body=file
).execute()
name = update_result["snippet"]["name"]
isDraft = update_result["snippet"]["isDraft"]
print "Updated caption track '%s' draft status to be: '%s'" % (name, isDraft)
if file:
print "and updated the track with the new uploaded file."
# Call the API's captions.download method to download an existing caption track.
def download_caption(youtube, caption_id, tfmt):
subtitle = youtube.captions().download(
id=caption_id,
tfmt=tfmt
).execute()
print "First line of caption track: %s" % (subtitle)
# Call the API's captions.delete method to delete an existing caption track.
def delete_caption(youtube, caption_id):
youtube.captions().delete(
id=caption_id
).execute()
print "caption track '%s' deleted succesfully" % (caption_id)
if __name__ == "__main__":
# The "videoid" option specifies the YouTube video ID that uniquely
# identifies the video for which the caption track will be uploaded.
argparser.add_argument("--videoid",
help="Required; ID for video for which the caption track will be uploaded.")
# The "name" option specifies the name of the caption trackto be used.
argparser.add_argument("--name", help="Caption track name", default="YouTube for Developers")
# The "file" option specifies the binary file to be uploaded as a caption track.
argparser.add_argument("--file", help="Captions track file to upload")
# The "language" option specifies the language of the caption track to be uploaded.
argparser.add_argument("--language", help="Caption track language", default="en")
# The "captionid" option specifies the ID of the caption track to be processed.
argparser.add_argument("--captionid", help="Required; ID of the caption track to be processed")
# The "action" option specifies the action to be processed.
argparser.add_argument("--action", help="Action", default="all")
args = argparser.parse_args()
if (args.action in ('upload', 'list', 'all')):
if not args.videoid:
exit("Please specify videoid using the --videoid= parameter.")
if (args.action in ('update', 'download', 'delete')):
if not args.captionid:
exit("Please specify captionid using the --captionid= parameter.")
if (args.action in ('upload', 'all')):
if not args.file:
exit("Please specify a caption track file using the --file= parameter.")
if not os.path.exists(args.file):
exit("Please specify a valid file using the --file= parameter.")
youtube = get_authenticated_service(args)
try:
if args.action == 'upload':
upload_caption(youtube, args.videoid, args.language, args.name, args.file)
elif args.action == 'list':
list_captions(youtube, args.videoid)
elif args.action == 'update':
update_caption(youtube, args.captionid, args.file);
elif args.action == 'download':
download_caption(youtube, args.captionid, 'srt')
elif args.action == 'delete':
delete_caption(youtube, args.captionid);
else:
# All the available methods are used in sequence just for the sake of an example.
upload_caption(youtube, args.videoid, args.language, args.name, args.file)
captions = list_captions(youtube, args.videoid)
if captions:
first_caption_id = captions[0]['id'];
update_caption(youtube, first_caption_id, None);
download_caption(youtube, first_caption_id, 'srt')
delete_caption(youtube, first_caption_id);
except HttpError, e:
print "An HTTP error %d occurred:\n%s" % (e.resp.status, e.content)
else:
print "Created and managed caption tracks."
回答1:
Your app seems overly-complex... it's structured to be able to do everything that can be done w/captions, not just download. That makes it harder to debug, so I wrote an abridged (Python 2 or 3) version that just downloads captions:
# Usage example: $ python captions-download.py Txvud7wPbv4
from __future__ import print_function
from apiclient import discovery
from httplib2 import Http
from oauth2client import file, client, tools
SCOPES = 'https://www.googleapis.com/auth/youtube.force-ssl'
store = file.Storage('storage.json')
creds = store.get()
if not creds or creds.invalid:
flow = client.flow_from_clientsecrets('client_secret.json', SCOPES)
creds = tools.run_flow(flow, store)
YOUTUBE = discovery.build('youtube', 'v3', http=creds.authorize(Http()))
def process(vid):
caption_info = YOUTUBE.captions().list(
part='id', videoId=vid).execute().get('items', [])
caption_str = YOUTUBE.captions().download(
id=caption_info[0]['id'], tfmt='srt').execute()
caption_data = caption_str.split('\n\n')
for line in caption_data:
if line.count('\n') > 1:
i, cap_time, caption = line.split('\n', 2)
print('%02d) [%s] %s' % (
int(i), cap_time, ' '.join(caption.split())))
if __name__ == '__main__':
import sys
if len(sys.argv) == 2:
VID = sys.argv[1]
process(VID)
The way it works is this:
- You pass in the video ID (VID) as the only argument (
sys.argv[1]) - It uses that VID to look up the caption IDs with
YOUTUBE.captions().list() - Assuming the video has (at least) one caption track, I grab its ID (
caption_info[0]['id']) - Then it calls
YOUTUBE.captions().download()with that caption ID requesting thesrttrack format - All individual captions are delimited by double NEWLINEs, so split on 'em
- Loop through each caption; there's data if there are at least 2 NEWLINEs in the line, so only
split()on the 1st pair - Display the caption#, timeline of when it appears, then the caption itself, changing all remaining NEWLINEs to spaces
When I run it, I get the expected result... here on a video I own:
$ python captions-download.py MY_VIDEO_ID
01) [00:00:06,390 --> 00:00:09,280] iterator cool but that's cool
02) [00:00:09,280 --> 00:00:12,280] your the moment
03) [00:00:13,380 --> 00:00:16,380] and sellers very thrilled
:
Couple of things...
- I think you need to be the owner of the video you're trying to download the captions for.
- I tried my script on your video, and I get a 403 HTTP Forbidden error
- Here are other errors you may get from the API
- In your case, it looks like something is messing up the video ID you're passing in.
- It thinks you're giving it
<code>and</code>(notice the hex 0x3c & 0x3e values)... rich text? - Anyway, this is why I wrote my own, shorter version... so I have a more controlled environment to experiment.
- It thinks you're giving it
FWIW, since you're new to using Google APIs, I've made a couple of intro videos I made to get developers on-boarded with using Google APIs in this playlist. The auth code is the toughest, so focus on videos 3 and 4 in that playlist to help get you acclimated.
I don't really have any videos that cover YouTube APIs (as I focus more on G Suite APIs) although I do have the one Google Apps Script example (video 22 in playlist); if you're new to Apps Script, you need to review your JavaScript then check out video 5 first. Hope this helps!
来源：https://stackoverflow.com/questions/41935427/cant-download-video-captions-using-youtube-api-v3-in-python