Tag [1][0][0][0]/0x00000001 incompatible with output codec id '65536'

[Fanch]

Summary of the bug:
How to reproduce:

ffmpeg -i TutoXsplit2_Tests.avi -vcodec libx264 -s 1280x720 -aspect 1280:720 -r 30000/1001 -vpre fast -acodec copy -f mp4 /var/www/lesnulmarrants/TutoXsplit2.mp4
ffmpeg version 0.9.1-syslint, Copyright (c) 2000-2012 the FFmpeg developers
  built on Jan  9 2012 14:42:55 with gcc 4.4.5
  configuration: --prefix=/usr/local/cpffmpeg --enable-nonfree --enable-zlib --enable-gpl --enable-pthreads --enable-libopencore-amrnb --enable-decoder=liba5                         2 --enable-libopencore-amrwb --enable-libfaac --enable-libmp3lame --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libxvid --enable-filter=dra                         wtext --enable-libfreetype --extra-cflags=-I/usr/local/cpffmpeg/include/ --extra-ldflags=-L/usr/local/cpffmpeg/lib --enable-version3 --extra-version=syslint                          --enable-avdevice
  libavutil    51. 32. 0 / 51. 32. 0
  libavcodec   53. 42. 4 / 53. 42. 4
  libavformat  53. 24. 2 / 53. 24. 2
  libavdevice  53.  4. 0 / 53.  4. 0
  libavfilter   2. 53. 0 /  2. 53. 0
  libswscale    2.  1. 0 /  2.  1. 0
  libpostproc  51.  2. 0 / 51.  2. 0
Input #0, avi, from 'TutoXsplit2_Tests.avi':
  Duration: 00:03:29.61, start: 0.000000, bitrate: 44062 kb/s
    Stream #0:0: Video: msvideo1 (CRAM / 0x4D415243), rgb555le, 1004x880, 200 fps, 200 tbr, 200 tbn, 200 tbc
    Metadata:
      title           : ~temp.avi Vid▒o #1
    Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 2 channels, s16, 1411 kb/s
    Metadata:
      title           : Microsoft Waveform▒: ~temp001.wav
File '/var/www/lesnulmarrants/TutoXsplit2.mp4' already exists. Overwrite ? [y/N] y
Incompatible pixel format 'rgb555le' for codec 'libx264', auto-selecting format 'yuv420p'
[buffer @ 0x32ad440] w:1004 h:880 pixfmt:rgb555le tb:1/1000000 sar:0/1 sws_param:
[scale @ 0x32acf80] w:1004 h:880 fmt:rgb555le -> w:1280 h:720 fmt:yuv420p flags:0x4
[libx264 @ 0x32aea40] using SAR=1/1
[libx264 @ 0x32aea40] using cpu capabilities: none!
[libx264 @ 0x32aea40] profile High, level 3.1
[libx264 @ 0x32aea40] 264 - core 120 r2120 0c7dab9 - H.264/MPEG-4 AVC codec - Copyleft 2003-2011 - http://www.videolan.org/x264.html - options: cabac=1 ref=2                          deblock=1:0:0 analyse=0x3:0x113 me=hex subme=6 psy=0 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offs                         et=0 threads=12 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1                          open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=10 qpmax=51 qpstep=4 ip_                         ratio=1.40 aq=1:1.00
[mp4 @ 0x32ae260] Tag [1][0][0][0]/0x00000001 incompatible with output codec id '65536'
Output #0, mp4, to '/var/www/lesnulmarrants/TutoXsplit2.mp4':
    Stream #0:0: Video: h264 (![0][0][0] / 0x0021), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], q=10-51, 90k tbn, 29.97 tbc
    Metadata:
      title           : ~temp.avi Vid▒o #1
    Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 2 channels, 1411 kb/s
    Metadata:
      title           : Microsoft Waveform▒: ~temp001.wav
Stream mapping:
  Stream #0:0 -> #0:0 (msvideo1 -> libx264)
  Stream #0:1 -> #0:1 (copy)
Could not write header for output file #0 (incorrect codec parameters ?)

[Carl Eugen Hoyos]

The relevant line is

[mp4 @ 0x32ae260] Tag [1][0][0][0]/0x00000001 incompatible with output codec id '65536'

You cannot put pcm_s16le in mp4 / isom, it does work with mov.