dumping current status as json,help needed for using dictionary ydl_opts

[siddht4]

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[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'-v', u'http://www.youtube.com/watch?v=BaW_jenozKcj']
[debug] Encodings: locale cp1251, fs mbcs, out cp866, pref cp1251
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[debug] Python version 2.7.11 - Windows-2003Server-5.2.3790-SP2
[debug] exe versions: ffmpeg N-75573-g1d0487f, ffprobe N-75573-g1d0487f, rtmpdump 2.4
[debug] Proxy map: {}
...
<end of log>

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Hey there I was trying to dump my current downloading status as json(any text file format should have work),so that as it reached 95 %,the process would start the next file in queue without waiting for the file to download,get complete,mixing the audio and video and then the second file in queue.I opted for dump-json and print-json but it didnt work.

The second part is I want the size of the unlisted video size but unable to do this as there is no way --get-size is there,but this was my shot as the file downloaded would have helped me.

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example: [download] 18.5% of 79.04MiB at 105.36KiB/s
as {"status":"download","file_size":79.04MiB,"downloaded_percent":"18.5","speed":105.36},

[dstftw]

Use progress_hooks.

[siddht4]

@dstftw please guide me what did you meant,is it a youtube-dl command or done manually in python

[siddht4]

found here https://github.com/rg3/youtube-dl#embedding-youtube-dl . and does youtube-dl supports file lock

[siddht4]

i need a help, this is my python external code to download via youtube_dl : from future import unicode_literals
import youtube_dl
import os
import json

url=input("\n Enter the video url :")
_i=len(url)

#1:
#2:
#3:
_faa='a'+'.json'
fo = open(_faa, "w")
class MyLogger(object):
def debug(self, msg):
pass

def warning(self, msg):
    pass

def error(self, msg):
    print(msg)

def my_hook(d):

if d['status'] == 'finished':
    print('File downloaded ')
else:
    #fo.write(d)
    os.system('clear')
    #_a_file=[]
    #_a_file[0].append(d['downloaded_bytes'])
    #_a_file[1].append(d['speed'])
    #_a__=str(d['downloaded_bytes']
    #_nm=d['eta']
    #print(d)
    
    _json=json.dumps(d)
    print(_json)
    fo.write(_json)

ydl_opts = {
'format': '480p',
'postprocessors': [],
'logger': MyLogger(),
'progress_hooks': [my_hook],
}
with youtube_dl.YoutubeDL(ydl_opts) as ydl:
ydl.download([url])
fo.close()

I need to know what are the other parameters supported in ydl_opts and how to implement command line reading from text file in ydl_opts i.e "youtube-dl -a 1.list".