rts.ch video unreadable when downloaded with "-f mp4-701k"

[goundoulf]

After showing available formats:
$ youtube-dl -F http://www.rts.ch/play/tv/passe-moi-les-jumelles/video/la-voix-qui-porte-les-arpenteurs-darbres?id=6168310

I chose to download with -f mp4-701k, because if I use the default, the file is too big.
The problem is that the video is unreadable.

Thanks!

[remitamine]

the problem is not related to youtube-dl.
i can play it using mpv.
this is the video info using ffprobe.

ffprobe $(python __main__.py -g -f mp4-701k 'http://www.rts.ch/play/tv/passe-moi-les-jumelles/video/la-voix-qui-porte-les-arpenteurs-darbres?id=6168310')
ffprobe version 2.8.2 Copyright (c) 2007-2015 the FFmpeg developers
  built with gcc 5.2.0 (GCC)
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-avisynth --enable-avresample --enable-fontconfig --enable-gnutls --enable-gpl --enable-ladspa --enable-libass --enable-libbluray --enable-libfreetype --enable-libfribidi --enable-libgsm --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-shared --enable-version3 --enable-x11grab
  libavutil      54. 31.100 / 54. 31.100
  libavcodec     56. 60.100 / 56. 60.100
  libavformat    56. 40.101 / 56. 40.101
  libavdevice    56.  4.100 / 56.  4.100
  libavfilter     5. 40.101 /  5. 40.101
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.101 /  1.  2.101
  libpostproc    53.  3.100 / 53.  3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'http://download-video.rts.ch/paju/2014/paju_20140926_full_f_814947-701k.mp4?start=00:00:00.000&end=01:00:29.960':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isom
    creation_time   : 2014-09-23 15:23:37
  Duration: 01:00:30.00, start: 0.000000, bitrate: 797 kb/s
    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv), 640x360 [SAR 1:1 DAR 16:9], 699 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
    Metadata:
      creation_time   : 2014-09-23 15:23:37
      handler_name    : MP4 Video Media Handler
      encoder         : AVC Coding
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 93 kb/s (default)
    Metadata:
      creation_time   : 2014-09-23 15:23:37
      handler_name    : MP4 Sound Media Handler