I had something similar before, but now i have no clue what it could be.
I use the appimage of kdenlive on manjaro and when i try to make proxies i get this error

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ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 6.3.1 (GCC) 20170109
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-avisynth --enable-avresample --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libass --enable-libbluray --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --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-netcdf --enable-shared --enable-version3 --enable-x11grab
  libavutil      55. 34.101 / 55. 34.101
  libavcodec     57. 64.101 / 57. 64.101
  libavformat    57. 56.101 / 57. 56.101
  libavdevice    57.  1.100 / 57.  1.100
  libavfilter     6. 65.100 /  6. 65.100
  libavresample   3.  1.  0 /  3.  1.  0
  libswscale      4.  2.100 /  4.  2.100
  libswresample   2.  3.100 /  2.  3.100
  libpostproc    54.  1.100 / 54.  1.100
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/run/media/kalimerox/movie emitter/VIDEO/2016/2016/SOLAIRE/day1/C0047.MP4':
  Metadata:
    major_brand     : XAVC
    minor_version   : 16785407
    compatible_brands: XAVCmp42iso2
    creation_time   : 2016-09-25T19:14:54.000000Z
  Duration: 00:10:44.16, start: 0.000000, bitrate: 51639 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv), 1920x1080 [SAR 1:1 DAR 16:9], 49897 kb/s, 25 fps, 25 tbr, 25k tbn, 50 tbc (default)
    Metadata:
      creation_time   : 2016-09-25T19:14:54.000000Z
      handler_name    : Video Media Handler
      encoder         : AVC Coding
    Stream #0:1(und): Audio: pcm_s16be (twos / 0x736F7774), 48000 Hz, stereo, s16, 1536 kb/s (default)
    Metadata:
      creation_time   : 2016-09-25T19:14:54.000000Z
      handler_name    : Sound Media Handler
    Stream #0:2(und): Data: none (rtmd / 0x646D7472), 204 kb/s (default)
    Metadata:
      creation_time   : 2016-09-25T19:14:54.000000Z
      handler_name    : Timed Metadata Media Handler
      timecode        : 21:43:02:24
[libx264 @ 0x562decc29ea0] using SAR=1/1
[libx264 @ 0x562decc29ea0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
[libx264 @ 0x562decc29ea0] profile High, level 4.2
[libx264 @ 0x562decc29ea0] 264 - core 148 r2708 86b7198 - H.264/MPEG-4 AVC codec - Copyleft 2003-2016 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=2 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=4 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=1 keyint=5 keyint_min=1 scenecut=40 intra_refresh=0 rc_lookahead=5 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to '/run/media/kalimerox/fastsounds/kdenlive/solaire project folder/proxy/ea11acfcdbbcaf057238a92405be6deb.mpg':
  Metadata:
    major_brand     : XAVC
    minor_version   : 16785407
    compatible_brands: XAVCmp42iso2
    encoder         : Lavf57.56.101
    Stream #0:0(und): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=-1--1, 50 fps, 12800 tbn, 50 tbc (default)
    Metadata:
      creation_time   : 2016-09-25T19:14:54.000000Z
      handler_name    : Video Media Handler
      encoder         : Lavc57.64.101 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    Stream #0:1(und): Audio: ac3 ([165][0][0][0] / 0x00A5), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      creation_time   : 2016-09-25T19:14:54.000000Z
      handler_name    : Sound Media Handler
      encoder         : Lavc57.64.101 ac3
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (pcm_s16be (native) -> ac3 (native))
Press [q] to stop, [?] for help

av_interleaved_write_frame(): No space left on device
Error writing trailer of /run/media/kalimerox/fastsounds/kdenlive/solaire project folder/proxy/ea11acfcdbbcaf057238a92405be6deb.mpg: No space left on deviceframe=   14 fps=0.0 q=31.0 Lsize=       0kB time=00:00:00.47 bitrate=   0.8kbits/s speed=0.851x   
video:67kB audio:8kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
[libx264 @ 0x562decc29ea0] frame I:3     Avg QP:24.35  size: 79832
[libx264 @ 0x562decc29ea0] frame P:3     Avg QP:30.27  size:  2685
[libx264 @ 0x562decc29ea0] frame B:8     Avg QP:30.55  size:  3026
[libx264 @ 0x562decc29ea0] consecutive B-frames: 21.4%  0.0% 21.4% 57.1%
[libx264 @ 0x562decc29ea0] mb I  I16..4: 25.3% 50.3% 24.4%
[libx264 @ 0x562decc29ea0] mb P  I16..4:  0.3%  0.1%  0.0%  P16..4:  6.9%  2.5%  0.7%  0.0%  0.0%    skip:89.5%
[libx264 @ 0x562decc29ea0] mb B  I16..4:  0.2%  0.1%  0.0%  B16..8:  6.2%  1.8%  0.1%  direct: 3.1%  skip:88.6%  L0:51.0% L1:39.5% BI: 9.6%
[libx264 @ 0x562decc29ea0] 8x8 transform intra:50.1% inter:23.3%
[libx264 @ 0x562decc29ea0] coded y,uvDC,uvAC intra: 51.7% 48.5% 21.7% inter: 1.7% 0.7% 0.0%
[libx264 @ 0x562decc29ea0] i16 v,h,dc,p: 52% 30% 11%  8%
[libx264 @ 0x562decc29ea0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 38% 25% 17%  3%  3%  4%  3%  3%  5%
[libx264 @ 0x562decc29ea0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 30% 23%  9%  6%  6%  8%  6%  5%  7%
[libx264 @ 0x562decc29ea0] i8c dc,h,v,p: 48% 22% 25%  5%
[libx264 @ 0x562decc29ea0] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x562decc29ea0] kb/s:7764.43
Conversion failed!


Any idea what i m doing wrong? thanks

oops I think the problem was my partition was full.. ;( sorry