D:\>ffmpeg -y -i c0020.mxf -vcodec mjpeg -pix_fmt yuvj422p -an testout.avi
ffmpeg version N-54362-ge0be3cb Copyright (c) 2000-2013 the FFmpeg developers
built on Jul 2 2013 22:15:59 with gcc 4.7.3 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
enable-libxvid --enable-zlib
libavutil 52. 38.100 / 52. 38.100
libavcodec 55. 18.100 / 55. 18.100
libavformat 55. 11.100 / 55. 11.100
libavdevice 55. 2.100 / 55. 2.100
libavfilter 3. 77.101 / 3. 77.101
libswscale 2. 3.100 / 2. 3.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 3.100 / 52. 3.100
Guessed Channel Layout for Input Stream #0.1 : mono
Guessed Channel Layout for Input Stream #0.2 : mono
Guessed Channel Layout for Input Stream #0.3 : mono
Guessed Channel Layout for Input Stream #0.4 : mono
Guessed Channel Layout for Input Stream #0.5 : mono
Guessed Channel Layout for Input Stream #0.6 : mono
Guessed Channel Layout for Input Stream #0.7 : mono
Guessed Channel Layout for Input Stream #0.8 : mono
Input #0, mxf, from 'c0020.mxf':
Metadata:
uid : 41821e00-3664-05c1-0270-08004602023b
generation_uid : 41821e00-3664-05c2-0270-08004602023b
company_name : SONY
product_name : Opt
product_version : 1.22
product_uid : 060e2b34-0401-0103-0e06-012002010300
modification_date: 2013-05-24 22:12:18
timecode : 01:34:21:15
Duration: 00:00:36.60, start: 0.000000, bitrate: 60256 kb/s
Stream #0:0: Video: mpeg2video (4:2:2), yuv422p, 1920x1080 [SAR 1:1 DAR 16:9
], 25 fps, 25 tbr, 25 tbn, 50 tbc
Stream #0:1: Audio: pcm_s24le, 48000 Hz, mono, s32, 1152 kb/s
Stream #0:2: Audio: pcm_s24le, 48000 Hz, mono, s32, 1152 kb/s
Stream #0:3: Audio: pcm_s24le, 48000 Hz, mono, s32, 1152 kb/s
Stream #0:4: Audio: pcm_s24le, 48000 Hz, mono, s32, 1152 kb/s
Stream #0:5: Audio: pcm_s24le, 48000 Hz, mono, s32, 1152 kb/s
Stream #0:6: Audio: pcm_s24le, 48000 Hz, mono, s32, 1152 kb/s
Stream #0:7: Audio: pcm_s24le, 48000 Hz, mono, s32, 1152 kb/s
Stream #0:8: Audio: pcm_s24le, 48000 Hz, mono, s32, 1152 kb/s
Output #0, avi, to 'testout.avi':
Metadata:
uid : 41821e00-3664-05c1-0270-08004602023b
generation_uid : 41821e00-3664-05c2-0270-08004602023b
company_name : SONY
product_name : Opt
product_version : 1.22
product_uid : 060e2b34-0401-0103-0e06-012002010300
modification_date: 2013-05-24 22:12:18
ISMP : 01:34:21:15
ISFT : Lavf55.11.100
Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p, 1920x1080 [SAR 1:1
DAR 16:9], q=2-31, 200 kb/s, 25 tbn, 25 tbc
Stream mapping:
Stream #0:0 -> #0:0 (mpeg2video -> mjpeg)
Press [q] to stop, [?] for help
[mpeg2video @ 02a3e4e0] warning: first frame is no keyframe
Last message repeated 1 times
frame= 14 fps=0.0 q=0.0 size= 2850kB time=00:00:00.48 bitrate=48642.1kbits/

...

frame= 915 fps= 35 q=0.0 Lsize= 108953kB time=00:00:36.60 bitrate=24386.4kbits
/s
video:108925kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.025282%


D:\>

so my testout.avi is unplayable
Any idea to solve?

thanks to all