abcnews.go.com only downloads the first fragment

[sant527]

$ youtube-dl --version
2017.12.14

$ youtube-dl --verbose "http://abcnews.go.com/Nightline/video/actress-catherine-oxenberg-concerned-daughter-inside-nxivm-part-51830259"
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--verbose', 'http://abcnews.go.com/Nightline/video/actress-catherine-oxenberg-concerned-daughter-inside-nxivm-part-51830259']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2017.12.14
[debug] Python version 3.6.0 - Linux-4.10.2-1-ARCH-x86_64-with-arch
[debug] exe versions: ffmpeg 3.2.4, ffprobe 3.2.4, phantomjs 2.1.1, rtmpdump 2.4
[debug] Proxy map: {}
[abcnews:video] Downloading Akamai AMP feed
[abcnews:video] 51830259: Downloading f4m manifest
WARNING: Unable to download f4m manifest: HTTP Error 504: Gateway Timeout
[abcnews:video] 51830259: Downloading m3u8 information
[debug] Default format spec: bestvideo+bestaudio/best
[debug] Invoking downloader on 'http://abcvod.abcnews.com/i/abcnews/2017/12/171216_ntl_secret_sorority_2_1255_,500,800,1200,1800,2500,3200,4500,.mp4.csmil/index_5_av.m3u8'
[download] Destination: Actress Catherine Oxenberg concerned for her daughter inside NXIVM-51830259.mp4
[debug] ffmpeg command line: ffmpeg -y -loglevel verbose -headers 'User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0) Gecko/20150101 Firefox/47.0 (Chrome)
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Encoding: gzip, deflate
Accept-Language: en-us,en;q=0.5
Cookie: _alid_=92vykUCVlWiqr1ZZC1wKFA==
' -i http://abcvod.abcnews.com/i/abcnews/2017/12/171216_ntl_secret_sorority_2_1255_,500,800,1200,1800,2500,3200,4500,.mp4.csmil/index_5_av.m3u8 -c copy -f mp4 'file:Actress Catherine Oxenberg concerned for her daughter inside NXIVM-51830259.mp4.part'
ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 6.3.1 (GCC) 20170109
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-avisynth --enable-avresample --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libass --enable-libbluray --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-netcdf --enable-shared --enable-version3 --enable-x11grab
  libavutil      55. 34.101 / 55. 34.101
  libavcodec     57. 64.101 / 57. 64.101
  libavformat    57. 56.101 / 57. 56.101
  libavdevice    57.  1.100 / 57.  1.100
  libavfilter     6. 65.100 /  6. 65.100
  libavresample   3.  1.  0 /  3.  1.  0
  libswscale      4.  2.100 /  4.  2.100
  libswresample   2.  3.100 /  2.  3.100
  libpostproc    54.  1.100 / 54.  1.100
[hls,applehttp @ 0x563d81c0f700] HLS request for url 'http://abcvod.abcnews.com/i/abcnews/2017/12/171216_ntl_secret_sorority_2_1255_,500,800,1200,1800,2500,3200,4500,.mp4.csmil/segment1_5_av.ts', offset 0, playlist 0
[h264 @ 0x563d81c3eee0] Reinit context to 1280x720, pix_fmt: yuv420p
Input #0, hls,applehttp, from 'http://abcvod.abcnews.com/i/abcnews/2017/12/171216_ntl_secret_sorority_2_1255_,500,800,1200,1800,2500,3200,4500,.mp4.csmil/index_5_av.m3u8':
  Duration: 00:05:54.85, start: 0.100667, bitrate: 0 kb/s
  Program 0 
    Metadata:
      variant_bitrate : 0
    Stream #0:0: Video: h264 (Main), 1 reference frame ([27][0][0][0] / 0x001B), yuv420p(left), 1280x720 [SAR 1:1 DAR 16:9], Closed Captions, 29.97 tbr, 90k tbn, 59.94 tbc
    Metadata:
      variant_bitrate : 0
    Stream #0:1: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp
    Metadata:
      variant_bitrate : 0
Output #0, mp4, to 'file:Actress Catherine Oxenberg concerned for her daughter inside NXIVM-51830259.mp4.part':
  Metadata:
    encoder         : Lavf57.56.101
    Stream #0:0: Video: h264 (Main), 1 reference frame ([33][0][0][0] / 0x0021), yuv420p(left), 1280x720 (0x0) [SAR 1:1 DAR 16:9], q=2-31, 29.97 tbr, 90k tbn, 90k tbc
    Metadata:
      variant_bitrate : 0
    Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, stereo
    Metadata:
      variant_bitrate : 0
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
Automatically inserted bitstream filter 'aac_adtstoasc'; args=''
[hls,applehttp @ 0x563d81c0f700] HLS request for url 'http://abcvod.abcnews.com/i/abcnews/2017/12/171216_ntl_secret_sorority_2_1255_,500,800,1200,1800,2500,3200,4500,.mp4.csmil/segment2_5_av.ts', offset 0, playlist 0
[http @ 0x563d81c2f0c0] HTTP error 504 Gateway Timeout
[hls,applehttp @ 0x563d81c0f700] Failed to open segment of playlist 0
[hls,applehttp @ 0x563d81c0f700] HLS request for url 'http://abcvod.abcnews.com/i/abcnews/2017/12/171216_ntl_secret_sorority_2_1255_,500,800,1200,1800,2500,3200,4500,.mp4.csmil/segment3_5_av.ts', offset 0, playlist 0

When it tries to download the secod segment it stays there for a long time and later says 504 Gateway Timeout

[dstftw]

Most likely a network issue on your side.