title: Frame rate very high for a muxer not efficiently supporting it
body: <p>I got an error when trying to run the following command with FFMpeg:</p>
  
  <p>-i "file1.mp4"  -s 506x406  -b:v 2000k  -ar 22050  "file2.mp4" </p>
  
  <p>FFMpeg was stuck converting this video, which was just a 7Mb .mp4 file, for hours and eventually I had to kill the process.</p>
  
  <p>The output error from FFMpeg is as follows:</p>
  
  <pre><code>Converter Error Message: 
  ffmpeg version N-42069-g3233ad4 Copyright (c) 2000-2012 the FFmpeg developers
    built on Jun 30 2012 13:18:20 with gcc 4.7.1
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-runtime-cpudetect --enable-avisynth --enable-bzlib --enable-frei0r --enable-libass --enable-libcelt --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-libnut --enable-libopenjpeg --enable-librtmp --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-libutvideo --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
    libavutil      51. 63.100 / 51. 63.100
    libavcodec     54. 31.100 / 54. 31.100
    libavformat    54. 14.100 / 54. 14.100
    libavdevice    54.  0.100 / 54.  0.100
    libavfilter     3.  0.100 /  3.  0.100
    libswscale      2.  1.100 /  2.  1.100
    libswresample   0. 15.100 /  0. 15.100
    libpostproc    52.  0.100 / 52.  0.100
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'File1.mp4':
    Metadata:
      major_brand     : mp42
      minor_version   : 1
      compatible_brands: mp42mp41
      creation_time   : 2013-07-18 15:38:11
    Duration: 00:02:02.23, start: -7.105889, bitrate: 518 kb/s
      Stream #0:0(und): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 718x574 [SAR 64:45 DAR 22976:12915], 361 kb/s, 24.97 fps, 90k tbr, 90k tbn, 180k tbc
      Metadata:
        creation_time   : 2013-07-18 15:38:11
        handler_name    : Apple Video Media Handler
      Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, s16, 129 kb/s
      Metadata:
        creation_time   : 2013-07-18 15:38:11
        handler_name    : Apple Sound Media Handler
  [graph 0 input from stream 0:0 @ 0259cee0] w:718 h:574 pixfmt:yuv420p tb:1/90000 fr:90000/1 sar:64/45 sws_param:flags=2
  [output stream 0:0 @ 0259cda0] No opaque field provided
  [scaler for output stream 0:0 @ 0259c0e0] w:718 h:574 fmt:yuv420p sar:64/45 -&gt; w:506 h:406 fmt:yuv420p sar:666304/466785 flags:0x4
  **[mp4 @ 02599020] Frame rate very high for a muxer not efficiently supporting it.
  Please consider specifying a lower framerate, a different muxer or -vsync 2**
  [graph 1 input from stream 0:1 @ 02b88200] tb:1/48000 samplefmt:s16 samplerate:48000 chlayout:0x3
  [auto-inserted resampler 0 @ 024e44e0] chl:stereo fmt:s16 r:48000Hz -&gt; chl:stereo fmt:s16 r:22050Hz
  [libx264 @ 02407200] using SAR=895/627
  [libx264 @ 02407200] MB rate (74880000) &gt; level limit (2073600)
  [libx264 @ 02407200] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64
  [libx264 @ 02407200] profile High, level 5.2
  [libx264 @ 02407200] 264 - core 125 r2200 999b753 - H.264/MPEG-4 AVC codec - Copyleft 2003-2012 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=3 lookahead_threads=1 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=abr mbtree=1 bitrate=2000 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  Output #0, mp4, to 'File2.mp4':
    Metadata:
      major_brand     : mp42
      minor_version   : 1
      compatible_brands: mp42mp41
      encoder         : Lavf54.14.100
      Stream #0:0(und): Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 506x406 [SAR 666304:466785 DAR 22976:12915], q=-1--1, 2000 kb/s, 180k tbn, 90k tbc
      Metadata:
        creation_time   : 2013-07-18 15:38:11
        handler_name    : Apple Video Media Handler
      Stream #0:1(und): Audio: aac ([64][0][0][0] / 0x0040), 22050 Hz, stereo, s16, 128 kb/s
      Metadata:
        creation_time   : 2013-07-18 15:38:11
        handler_name    : Apple Sound Media Handler
  Stream mapping:
    Stream #0:0 -&gt; #0:0 (h264 -&gt; libx264)
    Stream #0:1 -&gt; #0:1 (aac -&gt; libvo_aacenc)
  Press [q] to stop, [?] for help
  DTS -3600, next:-79995 st:0 invalid dropping
  frame= 7201 fps=768 q=69.0 size=       0kB time=00:00:00.00 bitrate=   0.0kbits/s dup=7198 drop=0    
  frame=10801 fps=575 q=69.0 size=       0kB time=00:00:00.00 bitrate=   0.0kbits/s dup=10797 drop=0    
  frame=14401 fps=516 q=69.0 size=       0kB time=00:00:00.00 bitrate=   0.0kbits/s dup=14396 drop=0    
  frame=18001 fps=484 q=69.0 size=       0kB time=00:00:00.00 bitrate=   0.0kbits/s dup=17995 drop=0    
  frame=21601 fps=464 q=69.0 size=       0kB time=00:00:00.00 bitrate=   0.0kbits/s dup=21594 drop=0    
  frame=25201 fps=454 q=69.0 size=       0kB time=00:00:00.00 bitrate=   0.0kbits/s dup=25193 drop=0    
  .....
  </code></pre>
  
  <p>And it just pretty much carries on like that until when I killed the process.</p>
  
  <p>Can anyone explain to me what is going on here and what I can do to fix this?</p>