user1@PC:~/Videos$ ffmpeg -ss 00:10:00 -i DJ.webm -c copy DJ1.webm
ffmpeg version 2.5.10-0ubuntu0.15.04.1 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 4.9.2 (Ubuntu 4.9.2-10ubuntu13)
  configuration: --prefix=/usr --extra-version=0ubuntu0.15.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --shlibdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --enable-shared --disable-stripping --enable-avresample --enable-avisynth --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libshine --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libwavpack --enable-libwebp --enable-libxvid --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzvbi --enable-libzmq --enable-frei0r --enable-libvpx --enable-libx264 --enable-libsoxr --enable-gnutls --enable-openal --enable-libopencv --enable-librtmp --enable-libx265
  libavutil      54. 15.100 / 54. 15.100
  libavcodec     56. 13.100 / 56. 13.100
  libavformat    56. 15.102 / 56. 15.102
  libavdevice    56.  3.100 / 56.  3.100
  libavfilter     5.  2.103 /  5.  2.103
  libavresample   2.  1.  0 /  2.  1.  0
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
Input #0, matroska,webm, from 'DJ.webm':
  Metadata:
    encoder         : Lavf56.1.0
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0(eng): Video: vp9, yuv420p, 2560x720, SAR 1:1 DAR 32:9, 29.97 fps, 29.97 tbr, 1k tbn, 1k tbc (default)
    Stream #0:1(eng): Audio: vorbis, 44100 Hz, stereo, fltp (default)
Output #0, webm, to 'DJ1.webm':
  Metadata:
    encoder         : Lavf56.15.102
    Stream #0:0(eng): Video: vp9, yuv420p, 2560x720 [SAR 1:1 DAR 32:9], q=2-31, 29.97 fps, 1k tbn, 1k tbc (default)
    Stream #0:1(eng): Audio: vorbis, 44100 Hz, stereo (default)
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 4919 fps=0.0 q=-1.0 size=   27826kB time=00:02:29.68 bitrate=1522.9kbits/frame= 7804 fps=7804 q=-1.0 size=   49626kB time=00:03:58.65 bitrate=1703.4kbitsframe=13173 fps=8782 q=-1.0 size=   78730kB time=00:06:44.33 bitrate=1595.1kbitsav_interleaved_write_frame(): No space left on device
frame=16613 fps=8952 q=-1.0 Lsize=   98652kB time=00:08:30.49 bitrate=1583.1kbits/s
video:91150kB audio:7220kB subtitle:0kB other streams:0kB global headers:4kB muxing overhead: 0.286551%
Conversion failed!