avi to m4v to mp4 try

Coffee-Grinders-MacBook:movie download coffee$ ffmpeg -i the.big.bang.theory.s04e01.hdtv.xvid-fqm.avi -an -c:v copy -f m4v bigbang.m4v
ffmpeg version 1.1 Copyright (c) 2000-2013 the FFmpeg developers
  built on Jan 10 2013 17:51:32 with gcc 4.2.1 (GCC) (Apple Inc. build 5666) (dot 3)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/1.1 --enable-shared --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --cc=/usr/bin/gcc-4.2 --host-cflags='-Os -w -pipe -march=core2 -msse4.1 -mmacosx-version-min=10.6' --host-ldflags=-L/usr/local/lib --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
  libavutil      52. 13.100 / 52. 13.100
  libavcodec     54. 86.100 / 54. 86.100
  libavformat    54. 59.106 / 54. 59.106
  libavdevice    54.  3.102 / 54.  3.102
  libavfilter     3. 32.100 /  3. 32.100
  libswscale      2.  1.103 /  2.  1.103
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
Input #0, avi, from 'the.big.bang.theory.s04e01.hdtv.xvid-fqm.avi':
  Metadata:
    encoder         : transcode-1.0.4
  Duration: 00:21:04.70, start: 0.000000, bitrate: 1162 kb/s
    Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 624x352 [SAR 1:1 DAR 39:22], 23.98 tbr, 23.98 tbn, 23.98 tbc
    Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 128 kb/s
Output #0, m4v, to 'bigbang.m4v':
  Metadata:
    encoder         : Lavf54.59.106
    Stream #0:0: Video: mpeg4 (XVID / 0x44495658), yuv420p, 624x352 [SAR 1:1 DAR 39:22], q=2-31, 90k tbn, 23.98 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
frame= 1643 fps=0.0 q=-1.0 size=    8198kB time=00:01:08.52 bitrate= 980.0kbits/frame= 3437 fps=2429 q=-1.0 size=   16426kB time=00:02:23.35 bitrate= 938.7kbitsframe= 3941 fps=1934 q=-1.0 size=   32782kB time=00:02:44.37 bitrate=1633.8kbitsframe= 7193 fps=2655 q=-1.0 size=   49230kB time=00:05:00.00 bitrate=1344.3kbitsframe=10880 fps=3328 q=-1.0 size=   65541kB time=00:07:33.78 bitrate=1183.2kbitsframe=15851 fps=4205 q=-1.0 size=   84598kB time=00:11:01.11 bitrate=1048.3kbitsframe=20206 fps=4620 q=-1.0 size=  106503kB time=00:14:02.75 bitrate=1035.3kbitsframe=24166 fps=4914 q=-1.0 size=  122889kB time=00:16:47.92 bitrate= 998.8kbitsframe=27258 fps=5006 q=-1.0 size=  139269kB time=00:18:56.88 bitrate=1003.5kbitsframe=30322 fps=5314 q=-1.0 Lsize=  153181kB time=00:21:04.68 bitrate= 992.2kbits/s
video:153181kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.000000%
Coffee-Grinders-MacBook:movie download coffee$ ffmpeg -i bigbang.m4v -c copy bigbang.mp4
ffmpeg version 1.1 Copyright (c) 2000-2013 the FFmpeg developers
  built on Jan 10 2013 17:51:32 with gcc 4.2.1 (GCC) (Apple Inc. build 5666) (dot 3)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/1.1 --enable-shared --enable-gpl --enable-version3 --enable-nonfree --enable-hardcoded-tables --cc=/usr/bin/gcc-4.2 --host-cflags='-Os -w -pipe -march=core2 -msse4.1 -mmacosx-version-min=10.6' --host-ldflags=-L/usr/local/lib --enable-libx264 --enable-libfaac --enable-libmp3lame --enable-libxvid
  libavutil      52. 13.100 / 52. 13.100
  libavcodec     54. 86.100 / 54. 86.100
  libavformat    54. 59.106 / 54. 59.106
  libavdevice    54.  3.102 / 54.  3.102
  libavfilter     3. 32.100 /  3. 32.100
  libswscale      2.  1.103 /  2.  1.103
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  2.100 / 52.  2.100
[m4v @ 0x10180e800] Estimating duration from bitrate, this may be inaccurate
Input #0, m4v, from 'bigbang.m4v':
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: mpeg4 (Advanced Simple Profile), yuv420p, 624x352 [SAR 1:1 DAR 39:22], 23.98 tbr, 1200k tbn, 23.98 tbc
Output #0, mp4, to 'bigbang.mp4':
  Metadata:
    encoder         : Lavf54.59.106
    Stream #0:0: Video: mpeg4 ( [0][0][0] / 0x0020), yuv420p, 624x352 [SAR 1:1 DAR 39:22], q=2-31, 1200k tbn, 1200k tbc
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
frame= 3437 fps=0.0 q=-1.0 size=   16423kB time=00:02:23.26 bitrate= 939.1kbits/frame= 3941 fps=3637 q=-1.0 size=   32776kB time=00:02:44.28 bitrate=1634.3kbitsframe= 8529 fps=5386 q=-1.0 size=   55506kB time=00:05:55.64 bitrate=1278.5kbitspts (507600000) < dts (508608100) in stream 0
av_interleaved_write_frame(): Invalid argument