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Why am I getting this warning and how to fix it? Essentially, I want to convert a video to a jpg every 4th frame with the same resolution as original video.

[jalal@goku vid2]$ ffmpeg -i debate_vid2.mov -r 0.25 images_%08d.jpg

ffmpeg version 2.6.8 Copyright (c) 2000-2016 the FFmpeg developers

  built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-4)

  configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-gnutls --enable-ladspa --enable-libass --enable-libcdio --enable-libdc1394 --enable-libfaac --enable-nonfree --enable-libfdk-aac --enable-nonfree --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libx264 --enable-libx265 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect

  libavutil      54. 20.100 / 54. 20.100

  libavcodec     56. 26.100 / 56. 26.100

  libavformat    56. 25.101 / 56. 25.101

  libavdevice    56.  4.100 / 56.  4.100

  libavfilter     5. 11.102 /  5. 11.102

  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, mov,mp4,m4a,3gp,3g2,mj2, from 'debate_vid2.mov':

  Metadata:

    major_brand     : qt  

    minor_version   : 0

    compatible_brands: qt  

    creation_time   : 2017-03-10 02:45:46

  Duration: 01:36:50.03, start: 0.000000, bitrate: 785 kb/s

    Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 95 kb/s (default)

    Metadata:

      creation_time   : 2017-03-10 02:45:46

      handler_name    : Core Media Data Handler

    Stream #0:1(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 334x360 [SAR 1:1 DAR 167:180], 685 kb/s, 30 fps, 30 tbr, 600 tbn, 1200 tbc (default)

    Metadata:

      creation_time   : 2017-03-10 02:45:46

      handler_name    : Core Media Data Handler

      encoder         : H.264

[swscaler @ 0x1bb4240] deprecated pixel format used, make sure you did set range correctly

Output #0, image2, to 'images_%08d.jpg':

  Metadata:

    major_brand     : qt  

    minor_version   : 0

    compatible_brands: qt  

    encoder         : Lavf56.25.101

    Stream #0:0(und): Video: mjpeg, yuvj420p(pc), 334x360 [SAR 1:1 DAR 167:180], q=2-31, 200 kb/s, 0.25 fps, 0.25 tbn, 0.25 tbc (default)

    Metadata:

      creation_time   : 2017-03-10 02:45:46

      handler_name    : Core Media Data Handler

      encoder         : Lavc56.26.100 mjpeg

Stream mapping:

  Stream #0:1 -> #0:0 (h264 (native) -> mjpeg (native))

Press [q] to stop, [?] for help

frame= 1454 fps= 25 q=1.6 Lsize=N/A time=01:36:56.00 bitrate=N/A dup=0 drop=172847    

video:28470kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

[jalal@goku vid2]$ 

This is just a warning, not an error. You can safely ignore it.

PS: Your ffmpeg version is quite outdated – it's almost two years old. It won't hurt to update to a newer one.