Original command:

moshe@moshe-desktop:~$ ~/Downloads/ffmpeg-2.6.2/ffmpeg -fpsprobesize 30  -i '/media/1.5TB/not_backed_up/Video Lectures/Operating Systems/IMG_0928.MOV'  -c:v libx264 -preset veryslow -pix_fmt yuv420p -crf 20 -c:a copy '/media/1.5TB/not_backed_up/Video Lectures/Operating Systems_encoded/Class 02_IMG_0928.mp4'
ffmpeg version 2.6.2 Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  configuration: --enable-nonfree --enable-libfaac --enable-gpl --enable-libx264
  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
  libswscale      3.  1.101 /  3.  1.101
  libswresample   1.  1.100 /  1.  1.100
  libpostproc    53.  3.100 / 53.  3.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x2d3d360] Could not find codec parameters for stream 0 (Video: h264 (avc1 / 0x31637661), none(bt709), 1280x720, 10624 kb/s): unspecified pixel format
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/media/1.5TB/not_backed_up/Video Lectures/Operating Systems/IMG_0928.MOV':
  Metadata:
    major_brand     : qt  
    minor_version   : 0
    compatible_brands: qt  
    creation_time   : 2011-01-31 15:56:17
    model           : iPhone 4
    model-eng       : iPhone 4
    encoder         : 4.2.1
    encoder-eng     : 4.2.1
    date            : 2011-01-31T10:56:17-0500
    date-eng        : 2011-01-31T10:56:17-0500
    make            : Apple
    make-eng        : Apple
  Duration: 00:01:27.51, start: -70.472063, bitrate: 10697 kb/s
    Stream #0:0(und): Video: h264 (avc1 / 0x31637661), none(bt709), 1280x720, 10624 kb/s, 29.97 fps, 29.97 tbr, 600 tbn, 1200 tbc (default)
    Metadata:
      creation_time   : 2011-01-31 15:56:17
      handler_name    : Core Media Data Handler
      encoder         : H.264
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 63 kb/s (default)
    Metadata:
      creation_time   : 2011-01-31 15:56:18
      handler_name    : Core Media Data Handler
File '/media/1.5TB/not_backed_up/Video Lectures/Operating Systems_encoded/Class 02_IMG_0928.mp4' already exists. Overwrite ? [y/N] y
[buffer @ 0x2d32a40] Unable to parse option value "-1" as pixel format
    Last message repeated 1 times
[buffer @ 0x2d32a40] Error setting option pix_fmt to value -1.
[graph 0 input from stream 0:0 @ 0x2d9c960] Error applying options to the filter.
Error opening filters!



moshe@moshe-desktop:~$ ~/Downloads/ffmpeg-2.6.2/ffmpeg -probesize 2147483647 -analyzeduration 2147483647  -i '/media/1.5TB/not_backed_up/Video Lectures/Operating Systems/IMG_0928.MOV'  -c:v libx264 -preset veryslow -pix_fmt yuv420p -crf 20 -c:a copy '/media/1.5TB/not_backed_up/Video Lectures/Operating Systems_encoded/Class 02_IMG_0928.mp4'
ffmpeg version 2.6.2 Copyright (c) 2000-2015 the FFmpeg developers
  built with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1)
  configuration: --enable-nonfree --enable-libfaac --enable-gpl --enable-libx264
  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
  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 '/media/1.5TB/not_backed_up/Video Lectures/Operating Systems/IMG_0928.MOV':
  Metadata:
    major_brand     : qt  
    minor_version   : 0
    compatible_brands: qt  
    creation_time   : 2011-01-31 15:56:17
    model           : iPhone 4
    model-eng       : iPhone 4
    encoder         : 4.2.1
    encoder-eng     : 4.2.1
    date            : 2011-01-31T10:56:17-0500
    date-eng        : 2011-01-31T10:56:17-0500
    make            : Apple
    make-eng        : Apple
  Duration: 00:01:27.51, start: -70.472063, bitrate: 10697 kb/s
    Stream #0:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p(tv, bt709), 1280x720, 10624 kb/s, 29.97 fps, 29.97 tbr, 600 tbn, 1200 tbc (default)
    Metadata:
      creation_time   : 2011-01-31 15:56:17
      handler_name    : Core Media Data Handler
      encoder         : H.264
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 63 kb/s (default)
    Metadata:
      creation_time   : 2011-01-31 15:56:18
      handler_name    : Core Media Data Handler
File '/media/1.5TB/not_backed_up/Video Lectures/Operating Systems_encoded/Class 02_IMG_0928.mp4' already exists. Overwrite ? [y/N] y
[libx264 @ 0x29e0c80] using cpu capabilities: MMX2 SSE2Fast LZCNT
[libx264 @ 0x29e0c80] profile High, level 5.0
[libx264 @ 0x29e0c80] 264 - core 142 r2389 956c8d8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=16 deblock=1:0:0 analyse=0x3:0x133 me=umh subme=10 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=24 chroma_me=1 trellis=2 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=8 b_pyramid=2 b_adapt=2 b_bias=0 direct=3 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=60 rc=crf mbtree=1 crf=20.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to '/media/1.5TB/not_backed_up/Video Lectures/Operating Systems_encoded/Class 02_IMG_0928.mp4':
  Metadata:
    major_brand     : qt  
    minor_version   : 0
    compatible_brands: qt  
    make-eng        : Apple
    model           : iPhone 4
    model-eng       : iPhone 4
    make            : Apple
    encoder         : Lavf56.25.101
    date            : 2011-01-31T10:56:17-0500
    date-eng        : 2011-01-31T10:56:17-0500
    Stream #0:0(und): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 1280x720, q=-1--1, 29.97 fps, 30k tbn, 29.97 tbc (default)
    Metadata:
      creation_time   : 2011-01-31 15:56:17
      handler_name    : Core Media Data Handler
      encoder         : Lavc56.26.100 libx264
    Stream #0:1(und): Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, mono, 63 kb/s (default)
    Metadata:
      creation_time   : 2011-01-31 15:56:18
      handler_name    : Core Media Data Handler
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 4735 fps=7.6 q=-1.0 Lsize=   19586kB time=00:02:37.92 bitrate=1016.0kbits/s dup=2112 drop=0    
video:18826kB audio:684kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.385589%
[libx264 @ 0x29e0c80] frame I:19    Avg QP:13.05  size:135365
[libx264 @ 0x29e0c80] frame P:881   Avg QP:17.37  size: 12067
[libx264 @ 0x29e0c80] frame B:3835  Avg QP:22.04  size:  1584
[libx264 @ 0x29e0c80] consecutive B-frames:  1.8%  0.2%  5.3% 16.9% 26.0%  6.5%  0.0%  0.0% 43.3%
[libx264 @ 0x29e0c80] mb I  I16..4: 32.5% 34.9% 32.6%
[libx264 @ 0x29e0c80] mb P  I16..4:  0.8%  1.0%  0.4%  P16..4: 38.3%  6.9%  8.9%  0.1%  0.0%    skip:43.6%
[libx264 @ 0x29e0c80] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8: 22.3%  1.0%  0.2%  direct: 0.5%  skip:75.9%  L0:45.2% L1:52.5% BI: 2.3%
[libx264 @ 0x29e0c80] 8x8 transform intra:40.8% inter:55.1%
[libx264 @ 0x29e0c80] direct mvs  spatial:69.5% temporal:30.5%
[libx264 @ 0x29e0c80] coded y,uvDC,uvAC intra: 89.6% 64.7% 29.0% inter: 3.9% 4.2% 0.1%
[libx264 @ 0x29e0c80] i16 v,h,dc,p: 10% 10% 52% 28%
[libx264 @ 0x29e0c80] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu:  7%  6%  5% 12% 17% 14% 17% 11% 12%
[libx264 @ 0x29e0c80] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 13% 12% 16%  7% 10%  9% 13%  8% 12%
[libx264 @ 0x29e0c80] i8c dc,h,v,p: 48% 26% 17%  9%
[libx264 @ 0x29e0c80] Weighted P-Frames: Y:0.8% UV:0.5%
[libx264 @ 0x29e0c80] ref P L0: 45.0%  5.9% 16.5%  5.2%  5.1%  3.9%  3.9%  1.8%  1.9%  1.7%  1.7%  1.6%  1.6%  1.6%  1.7%  1.0%
[libx264 @ 0x29e0c80] ref B L0: 77.8% 11.1%  3.9%  1.5%  1.1%  1.1%  0.9%  0.4%  0.4%  0.4%  0.3%  0.3%  0.3%  0.3%  0.2%
[libx264 @ 0x29e0c80] ref B L1: 91.4%  8.6%
[libx264 @ 0x29e0c80] kb/s:976.13