ffmpeg -c:v h264 -i 1.ts -codec copy 1.mkv

ffmpeg version N-64278-g4d1fa38 Copyright (c) 2000-2014 the FFmpeg developers
  built on Jun 27 2014 22:02:02 with gcc 4.8.3 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
e --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-
libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libope
njpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsox
r --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab -
-enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
--enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-
libxavs --enable-libxvid --enable-decklink --enable-zlib
  libavutil      52. 90.101 / 52. 90.101
  libavcodec     55. 68.100 / 55. 68.100
  libavformat    55. 44.100 / 55. 44.100
  libavdevice    55. 13.101 / 55. 13.101
  libavfilter     4.  9.100 /  4.  9.100
  libswscale      2.  6.100 /  2.  6.100
  libswresample   0. 19.100 /  0. 19.100
  libpostproc    52.  3.100 / 52.  3.100
[live_flv @ 02dab5c0] Could not find codec parameters for stream 0 (Video: h264,
 665 kb/s): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, live_flv, from '1.ts':
  Metadata:
    Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
    displayWidth    : 1536
    displayHeight   : 864
    fps             : 20
    profile         :
    level           :
  Duration: 00:00:00.00, start: 5507.904000, bitrate: N/A
    Stream #0:0: Video: h264, 665 kb/s, 1k tbr, 1k tbn, 2k tbc
    Stream #0:1: Audio: aac, 48000 Hz, stereo, fltp, 65 kb/s
[matroska @ 02a4dfe0] Using AVStream.codec.time_base as a timebase hint to the m
uxer is deprecated. Set AVStream.time_base instead.
Output #0, matroska, to '1.mkv':
  Metadata:
    Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
    displayWidth    : 1536
    displayHeight   : 864
    fps             : 20
    profile         :
    level           :
    encoder         : Lavf55.44.100
    Stream #0:0: Audio: aac ([255][0][0][0] / 0x00FF), 48000 Hz, stereo, 65 kb/s

Stream mapping:
  Stream #0:1 -> #0:0 (copy)
Press [q] to stop, [?] for help
size=    1790kB time=00:01:52.66 bitrate= 130.2kbits/s
video:0kB audio:1753kB subtitle:0kB other streams:0kB global headers:0kB muxing
overhead: 2.119917%