Warning When Downloading From Aparat

[hassanghalami]

Warning When Downloading From Aparat.com
my url :http://www.aparat.com/v/wiYzl

WARNING: unable to extract isFamilyFriendly; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see  https://yt-dl.org/update  on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
[download] Destination:  -       -wiYzl.mp4
ERROR: m3u8 download detected but ffmpeg or avconv could not be found. Please install one.

i updated my youtube dl to youtube-dl-2016.12.22.

[Hrxn]

ERROR: m3u8 download detected but ffmpeg or avconv could not be found. Please install one.

Please post the full output of youtube-dl -v <URL>

[hassanghalami]

youtube-dl -v http://www.aparat.com/v/wiYzl
[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'-v', u'http://www.aparat.com/v/wiYzl']
[debug] Encodings: locale ANSI_X3.4-1968, fs ANSI_X3.4-1968, out ANSI_X3.4-1968, pref ANSI_X3.4-1968
[debug] youtube-dl version 2016.12.22
[debug] Python version 2.7.9 - Linux-3.16.0-4-amd64-x86_64-with-debian-8.4
[debug] exe versions: none
[debug] Proxy map: {}
[Aparat] wiYzl: Downloading webpage
[Aparat] wiYzl: Testing video URL 0
WARNING: unable to extract isFamilyFriendly; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see https://yt-dl.org/update on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
[debug] Invoking downloader on u'http://www.aparat.com/video/hls/manifest/visittype/embed/videohash/wiYzl/f/wiYzl.m3u8?k=2bbcf'
[download] Destination: - -wiYzl.mp4
ERROR: m3u8 download detected but ffmpeg or avconv could not be found. Please install one.
File "/usr/local/bin/youtube-dl", line 11, in
sys.exit(main())
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/init.py", line 444, in main
_real_main(argv)
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/init.py", line 434, in _real_main
retcode = ydl.download(all_urls)
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 1791, in download
url, force_generic_extractor=self.params.get('force_generic_extractor', False))
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 705, in extract_info
return self.process_ie_result(ie_result, download, extra_info)
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 751, in process_ie_result
return self.process_video_result(ie_result, download=download)
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 1435, in process_video_result
self.process_info(new_info)
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 1699, in process_info
success = dl(filename, info_dict)
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 1641, in dl
return fd.download(name, info)
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/downloader/common.py", line 353, in download
return self.real_download(filename, info_dict)
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/downloader/external.py", line 28, in real_download
retval = self._call_downloader(tmpfilename, info_dict)
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/downloader/external.py", line 195, in _call_downloader
self.report_error('m3u8 download detected but ffmpeg or avconv could not be found. Please install one.')
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/downloader/common.py", line 162, in report_error
self.ydl.report_error(*args, **kargs)
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 568, in report_error
self.trouble(error_message, tb)
File "/usr/local/lib/python2.7/dist-packages/youtube_dl/YoutubeDL.py", line 530, in trouble
tb_data = traceback.format_list(traceback.extract_stack())

[Hrxn]

Youtube-dl doesn't find ffmpeg..
Check that you have installed it properly.

[hassanghalami]

i installed ffmepeg from https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu

problem solved

tnx;)