why the leeco IE didn't download the best format video by default yet?

[avcode8]

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2017.07.02. If it's not read this FAQ entry and update. Issues with outdated version will be rejected.

• [√ ] I've verified and I assure that I'm running youtube-dl 2017.07.02

Before submitting an issue make sure you have:

• [ √] At least skimmed through README and most notably FAQ and BUGS sections
• [ √] Searched the bugtracker for similar issues including closed ones

What is the purpose of your issue?

• [√ ] Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

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Description of your issue, suggested solution and other information

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--verbose', u'http://www.le.com/ptv/vplay/20011758.html']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.07.02
[debug] Python version 2.7.12 - Darwin-15.6.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 3.2.2, ffprobe 3.2.2
[debug] Proxy map: {}
[debug] Using fake IP 36.158.251.28 (CN) as X-Forwarded-For.
[Le] 20011758: Downloading webpage
[Le] 20011758: Downloading flash playJson data
[Le] 20011758: Download JSON metadata for format 1080p
[Le] 20011758: Downloading m3u8 information for format 1080p
[Le] 20011758: Download JSON metadata for format 1000
[Le] 20011758: Downloading m3u8 information for format 1000
[Le] 20011758: Download JSON metadata for format 1300
[Le] 20011758: Downloading m3u8 information for format 1300
[Le] 20011758: Download JSON metadata for format 720p
[Le] 20011758: Downloading m3u8 information for format 720p
[Le] 20011758: Download JSON metadata for format 350
[Le] 20011758: Downloading m3u8 information for format 350
[debug] Invoking downloader on
[hlsnative] Downloading m3u8 manifest
[hlsnative] Total fragments: 36
[download] Destination: 中国惊奇先生01-20011758.mp4
[download] 100% of 34.36MiB in 05:26
[debug] ffmpeg command line: ffprobe -show_streams 'file:中国惊奇先生01-20011758.mp4'
[ffmpeg] Fixing malformated aac bitstream in "中国惊奇先生01-20011758.mp4"
[debug] ffmpeg command line: ffmpeg -y -i 'file:中国惊奇先生01-20011758.mp4' -c copy -f mp4 '-bsf:a' aac_adtstoasc 'file:中国惊奇先生01-20011758.temp.mp4'