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Crash downloading subtitles [periscope and transmission]

See original GitHub issue

Expected behaviour:

Download from RSS
Download subtitles
Sort files

Actual behaviour:

When the task for subtitles starts it get so many time between elements and at the end it raises an error, so doesn’t download any subtitle.

Steps to reproduce:

Step 1: run flex get execute.
Step 2: download elements from rss --> OK
Step 3: download subtitles --> crash

Config:

templates:
  global:
    transmission:
      host: localhost
      port: 9091
      username: 'user'
      password: 'pass'
      ratio: -1
      path: /media/HDDRaspberry/Incompletas
      addpaused: no
tasks:
  rss:
    priority: 1
    rss: http://showrss.info/user/
    all_series: yes
  subtitles:
    priority: 4
    disable: builtins 
    filesystem:
      path:
        - /media/HDDRaspberry/Incompletas
      regexp:  '.*\.(mp4|mkv|avi)$'
      recursive: yes
    accept_all: yes    
    regexp:  
      reject:
        - '.*[sS]ample.*'
    periscope:
      languages:
        - en
      alternatives:
        - es
      overwrite: yes
  sort:
    priority: 5
    disable: builtins
    filesystem:
      path: /media/HDDRaspberry/Incompletas/
      mask: '*.srt'
      recursive: yes
    accept_all: yes
    seen: local
    thetvdb_lookup: yes
    all_series:
      parse_only: yes
    move:
      to:  /media/HDDRaspberry/Descargas/Series/{{ tvdb_series_name }}/Season {{ tvdb_season|pad(2) }}/
      rename: '{{ tvdb_series_name }} - {{ series_id }} - {{ tvdb_ep_name}}{{ location | pathext }}'
      clean_source: 100
      along:
        extensions:
          - mkv
          - mp4
          - avi

Log:

2017-06-13 23:17 VERBOSE  filesystem    subtitles       Starting to scan folders.
2017-06-13 23:17 VERBOSE  filesystem    subtitles       Scanning folder /media/HDDRaspberry/Incompletas. Recursion is set to True.
2017-06-13 23:17 INFO     download      subtitles       Downloading: Gotham.S03E18.720p.HDTV.x264-KILLERS
2017-06-13 23:19 INFO     download      subtitles       Downloading: orange.is.the.new.black.s05e01.proper.720p.webrip.x264-morose
2017-06-13 23:21 CRITICAL task          subtitles       BUG: Unhandled error in plugin transmission: 
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/flexget/task.py", line 483, in __run_plugin
    return method(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/flexget/event.py", line 23, in __call__
    return self.func(*args, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/flexget/plugins/clients/transmission.py", line 303, in on_task_output
    self.add_to_transmission(self.client, task, config)
  File "/usr/local/lib/python2.7/dist-packages/flexget/plugins/clients/transmission.py", line 411, in add_to_transmission
    filedump = base64.b64encode(f.read()).decode('utf-8')
MemoryError