ffmpeg converter

Monas-MacBook-Pro:FalseColor mona$ ffmpeg -i CS585Bats-FalseColor_frame*.ppm  -vcodec mpeg4 test.avi
FFmpeg version SVN-r26402, Copyright (c) 2000-2011 the FFmpeg developers
  built on Aug  2 2016 19:05:32 with clang 7.3.0 (clang-703.0.31)
  configuration: --enable-libmp3lame --enable-libfaac --enable-gpl --enable-nonfree --enable-shared --disable-mmx --arch=x86_64 --cpu=core2
  libavutil     50.36. 0 / 50.36. 0
  libavcore      0.16. 1 /  0.16. 1
  libavcodec    52.108. 0 / 52.108. 0
  libavformat   52.93. 0 / 52.93. 0
  libavdevice   52. 2. 3 / 52. 2. 3
  libavfilter    1.74. 0 /  1.74. 0
  libswscale     0.12. 0 /  0.12. 0
Input #0, image2, from 'CS585Bats-FalseColor_frame000000750.ppm':
  Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
    Stream #0.0: Video: ppm, rgb24, 1024x1024, 25 tbr, 25 tbn, 25 tbc
ffmpeg(11416,0x7fffa5dc6340) malloc: *** error for object 0x100000001: pointer being realloc'd was not allocated
*** set a breakpoint in malloc_error_break to debug
Abort trap: 6