clibois@clibois-ThinkPad-T540p:~/temp$ ffmpeg  -i "Kyrielle montage tout OK.avi" -c:a copy -c:v libx265 -preset veryslow -x265-params crf=28 "outFile.mkv"
ffmpeg version 2.8.4 Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  configuration: --prefix=/home/clibois/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/clibois/ffmpeg_build/include --extra-ldflags=-L/home/clibois/ffmpeg_build/lib --bindir=/home/clibois/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libvorbis --enable-libx264 --enable-libx265 --enable-nonfree
  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
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  2.101 /  1.  2.101
  libpostproc    53.  3.100 / 53.  3.100
Input #0, avi, from 'Kyrielle montage tout OK.avi':
  Metadata:
    encoder         : Lavf54.63.104
  Duration: 01:37:47.16, start: 0.000000, bitrate: 4752 kb/s
    Stream #0:0: Video: h264 (Main) (H264 / 0x34363248), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 4485 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
    Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 256 kb/s
File 'outFile.mkv' already exists. Overwrite ? [y/N] y
x265 [info]: HEVC encoder version 1.8+1-5dcc9d3a928c400b
x265 [info]: build info [Linux][GCC 4.8.2][32 bit] 8bit
x265 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX AVX2 FMA3 LZCNT BMI2
x265 [info]: Main profile, Level-5 (Main tier)
x265 [info]: Thread pool created using 8 threads
x265 [info]: frame threads / pool features       : 3 / wpp(17 rows)
x265 [info]: Coding QT: max CU size, min CU size : 64 / 8
x265 [info]: Residual QT: max TU size, max depth : 32 / 3 inter / 3 intra
x265 [info]: ME / range / subpel / merge         : star / 57 / 4 / 4
x265 [info]: Keyframe min / max / scenecut       : 25 / 250 / 40
x265 [info]: Lookahead / bframes / badapt        : 40 / 8 / 2
x265 [info]: b-pyramid / weightp / weightb       : 1 / 1 / 1
x265 [info]: References / ref-limit  cu / depth  : 5 / 0 / 0
x265 [info]: AQ: mode / str / qg-size / cu-tree  : 1 / 1.0 / 32 / 1
x265 [info]: Rate Control / qCompress            : CRF-28.0 / 0.60
x265 [info]: tools: rect amp rd=6 psy-rd=0.30 rdoq=2 psy-rdoq=1.00 signhide
x265 [info]: tools: tmvp b-intra strong-intra-smoothing deblock sao
[matroska @ 0x9cb58c0] Codec for stream 1 does not use global headers but container format requires global headers
Output #0, matroska, to 'outFile.mkv':
  Metadata:
    encoder         : Lavf56.40.101
    Stream #0:0: Video: hevc (libx265), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 25 fps, 1k tbn, 25 tbc
    Metadata:
      encoder         : Lavc56.60.100 libx265
    Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, 256 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> hevc (libx265))
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
^C^Cav_interleaved_write_frame(): Immediate exit requested5 bitrate= 406.3kbits/s