aviocat does not work for hls streams

[Carl Eugen Hoyos]

I believe there is currently no way to dump the transport stream(s) of a hls stream using FFmpeg.

$ ffmpeg -f lavfi -i testsrc=d=100 -vcodec mpeg1video out.m3u8

The following only dumps the playlist to the output file:

$ aviocat out.m3u8 out

Dumping streams with -f data is currently broken but it also used to only dump the playlist:

$ ffmpeg -f data -i out.m3u8 -map 0 -f data -codec copy out
ffmpeg version n3.0-4-geb46065 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 4.7 (SUSE Linux)
  configuration: --enable-gpl
  libavutil      55. 17.103 / 55. 17.103
  libavcodec     57. 24.102 / 57. 24.102
  libavformat    57. 25.100 / 57. 25.100
  libavdevice    57.  0.101 / 57.  0.101
  libavfilter     6. 31.100 /  6. 31.100
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
Input #0, data, from 'out.m3u8':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Data: none
Output #0, data, to 'out':
  Metadata:
    encoder         : Lavf57.25.100
    Stream #0:0: Data: none
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
size=       0kB time=00:00:00.00 bitrate=N/A speed=   0x
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%