Also try to convert mp47 to flv but result are same . another format working fine .
See my result
C:\Program Files\WinFF>title Converting 2.mp4 (1/1)
C:\Program Files\WinFF>"C:\Program Files\WinFF\ffmpeg.exe" -y -i "E:\work\7\
2.mp4" -vcodec flv -f flv -r 29.97 -filter:v scale=320:240 -aspect 4:3 -b:v 300k -g
160 -cmp dct -subcmp dct -mbd 2 -flags +aic+cbp+mv0+mv4 -trellis 1 -ac 2 -ar
22050 -b:a 56k "C:\Users\Habib\Documents\22.flv"
ffmpeg version N-63833-gd4be3a8 Copyright (c) 2000-2014 the FFmpeg developers
built on Jun 7 2014 22:01:59 with gcc 4.8.2 (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-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-
libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libope
njpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsox
r --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab -
-enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
--enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-
libxavs --enable-libxvid --enable-decklink --enable-zlib
libavutil 52. 89.100 / 52. 89.100
libavcodec 55. 66.100 / 55. 66.100
libavformat 55. 42.101 / 55. 42.101
libavdevice 55. 13.101 / 55. 13.101
libavfilter 4. 6.100 / 4. 6.100
libswscale 2. 6.100 / 2. 6.100
libswresample 0. 19.100 / 0. 19.100
libpostproc 52. 3.100 / 52. 3.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 003d7920] multiple edit list entries, a/v desync migh
t occur, patch welcome
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'E:\work\7\2.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42isom
creation_time : 2014-03-04 03:36:11
encoder : mp4creator 1.6.1d
Duration: 00:06:38.03, start: 0.000000, bitrate: 271 kb/s
Stream #0:0(eng): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D), yuv420p
, 176x144 [SAR 1:1 DAR 11:9], 219 kb/s, 18 fps, 18 tbr, 90k tbn, 18 tbc (default
)
Metadata:
creation_time : 2014-03-04 03:36:11
Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 22050 Hz, stereo, fltp, 51
kb/s (default)
Metadata:
creation_time : 2014-03-04 03:36:12
[NULL @ 003da860] [Eval @ 0023b63c] Undefined constant or missing '(' in 'cbp'
[NULL @ 003da860] Unable to parse option value "cbp+mv0+mv4"
[NULL @ 003dcda0] [Eval @ 0023b63c] Undefined constant or missing '(' in 'cbp'
[NULL @ 003dcda0] Unable to parse option value "cbp+mv0+mv4"
[NULL @ 003da860] [Eval @ 0023b38c] Undefined constant or missing '(' in 'cbp'
[NULL @ 003da860] Unable to parse option value "cbp+mv0+mv4"
[NULL @ 003da860] Error setting option flags to value +aic+cbp+mv0+mv4.
Output #0, flv, to 'C:\Users\Habib\Documents\22.flv':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42isom
encoder : mp4creator 1.6.1d
Stream #0:0(eng): Video: flv1, q=2-31, 128 kb/s, SAR 1:1 DAR 0:0, 29.97 fps,
90k tbn (default)
Metadata:
creation_time : 2014-03-04 03:36:11
encoder : Lavc55.66.100 flv
Stream #0:1(eng): Audio: mp3, 0 channels, 128 kb/s (default)
Metadata:
creation_time : 2014-03-04 03:36:12
encoder : Lavc55.66.100 libmp3lame
Stream mapping:
Stream #0:0 -> #0:0 (mpeg4 (native) -> flv1 (flv))
Stream #0:1 -> #0:1 (aac (native) -> mp3 (libmp3lame))