Improving support for piping to stdout

[Jiriss]

youtube-dl pipes the live stream to an external video player correctly using parameter "o"

$ youtube-dl -v http://cls.elitehd-audiovisuales.com/luztv/livestream/index.m3u8 -o - | vlc -

A problem is when user close an external video player but youtube-dl still continues downloading stream. Does youtube-dl include some parameter that could help in this problem or can you improve support for piping to stdout? Now the downloading of the stream is stopped only when terminal window is closed or using Ctrl+C keys.

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• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

Add -v flag to your command line you run youtube-dl with, copy the whole output and insert it here. It should look similar to one below (replace it with your log inserted between triple ```):

$ youtube-dl -v http://cls.elitehd-audiovisuales.com/luztv/livestream/index.m3u8 -o - | vlc -
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'http://cls.elitehd-audiovisuales.com/luztv/livestream/index.m3u8', u'-o', u'-']
[debug] Encodings: locale UTF-8, fs UTF-8, out None, pref UTF-8
[debug] youtube-dl version 2017.05.29
[debug] Python version 2.7.6 - Linux-3.13.0-117-generic-x86_64
[debug] exe versions: avconv 9.20-6, avprobe 9.20-6, rtmpdump 2.4
[debug] Proxy map: {}
[generic] index: Requesting header
[generic] index: Downloading m3u8 information
[debug] Invoking downloader on u'http://cls.elitehd-audiovisuales.com/luztv/livestream/chunklist.m3u8'
[download] Destination: -
[debug] avconv command line: avconv -y -loglevel verbose -headers 'Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip, deflate
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20150101 Firefox/47.0 (Chrome)
' -i http://cls.elitehd-audiovisuales.com/luztv/livestream/chunklist.m3u8 -c copy -f mpegts -
avconv version 9.20-6:9.20-0ubuntu0.14.04.1, Copyright (c) 2000-2014 the Libav developers
  built on Dec  7 2016 21:22:31 with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  configuration: --arch=amd64 --enable-pthreads --enable-runtime-cpudetect --extra-version='6:9.20-0ubuntu0.14.04.1' --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --enable-bzlib --enable-libdc1394 --enable-libfreetype --enable-frei0r --enable-gnutls --enable-libgsm --enable-libmp3lame --enable-librtmp --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-vaapi --enable-vdpau --enable-libvorbis --enable-libvpx --enable-zlib --enable-gpl --enable-swscale --enable-libcdio --enable-x11grab --enable-libx264 --enable-libxvid --shlibdir=/usr/lib/x86_64-linux-gnu --enable-shared --disable-static
  libavutil     52.  3. 0 / 52.  3. 0
  libavcodec    54. 35. 1 / 54. 35. 1
  libavformat   54. 20. 4 / 54. 20. 4
  libavdevice   53.  2. 0 / 53.  2. 0
  libavfilter    3.  3. 0 /  3.  3. 0
  libavresample  1.  0. 1 /  1.  0. 1
  libswscale     2.  1. 1 /  2.  1. 1
[hls,applehttp @ 0xd263e0] max_analyze_duration reached
[hls,applehttp @ 0xd263e0] Estimating duration from bitrate, this may be inaccurate
Input #0, hls,applehttp, from 'http://cls.elitehd-audiovisuales.com/luztv/livestream/chunklist.m3u8':
  Duration: N/A, start: 4900.739000, bitrate: N/A
    Stream #0.0: Data: [21][0][0][0] / 0x0015
    Stream #0.1: Video: h264 (High), yuv420p, 576x480 [PAR 40:27 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 100 tbc
    Stream #0.2: Audio: aac, 48000 Hz, stereo, fltp
[mpegts @ 0xd65a80] muxrate VBR, pcr every 9000 pkts, sdt every 200, pat/pmt every 40 pkts
Output #0, mpegts, to 'pipe:':
  Metadata:
    encoder         : Lavf54.20.4
    Stream #0.0: Video: libx264, yuv420p, 576x480 [PAR 40:27 DAR 16:9], q=2-31, 90k tbn, 90k tbc
    Stream #0.1: Audio: aac, 48000 Hz, stereo
Stream mapping:
  Stream #0:1 -> #0:0 (copy)
  Stream #0:2 -> #0:1 (copy)
Press ctrl-c to stop encoding
...
<end of log>

[dstftw]

avconv issue. Use ffmpeg.

[Jiriss]

Thanks for tip but unfortunately the result is exactly same with parameters both --hls-prefer-ffmpeg and --prefer-ffmpeg or if I use them at same time.