title: ffmpeg highest quality mp4 to mpg
body: <p>I have a mp4 video that I need to convert to mpg (for windows PowerPoint2010)</p>
  
  <p>I have been trying to get best quality. But I keep getting error:</p>
  
  <pre><code>[mpeg @ 0x2523620] buffer underflow st=0 bufi=420177 size=445860
  [mpeg @ 0x2523620] packet too large, ignoring buffer limits to mux it
  [mpeg @ 0x2523620] buffer underflow st=0 bufi=420177 size=445860
  [mpeg @ 0x2523620] buffer underflow st=0 bufi=422218 size=445860
  </code></pre>
  
  <p>Could someone help me with the syntax for best quality ouput to mpg. Here is the output of the mp4 file:</p>
  
  <pre><code>Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
    Metadata:
      major_brand     : mp42
      minor_version   : 0
      compatible_brands: mp41isom
      creation_time   : 2016-06-10 11:15:06
    Duration: 00:04:20.86, start: 0.000000, bitrate: 18677 kb/s
      Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1920x1080, 18541 kb/s, 29.97 fps, 29.97 tbr, 29970 tbn, 59.94 tbc (default)
      Metadata:
        creation_time   : 2016-06-10 11:15:06
        handler_name    : VideoHandler
        encoder         : AVC Coding
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 132 kb/s (default)
      Metadata:
        creation_time   : 2016-06-10 11:15:06
        handler_name    : SoundHandler
  </code></pre>
  
  <p>I have tried the following but keep getting that error:</p>
  
  <pre><code>ffmpeg -i video.mp4 -c:v libx264 -c:a copy -qp 5 video.mpg
  ffmpeg -i video.mp4 -c:v libx264 -c:a copy -qscale:v 1 video.mpg
  ffmpeg -i video.mp4 -c:v libx264 -crf 0 -c:a copy -bf 2 -flags qprd -flags mv0 video.mpg
  ffmpeg -i video.mp4 -c:v libx264 -crf 0 -c:a copy video.mpg
  ffmpeg -i video.mp4 -c:v libx264 -preset slow -crf 5 -c:a copy video.mpg
  ffmpeg -i video.mp4 -c:v libx264 -preset slow -crf 5 -c:a copy -maxrate 11000k video.mpg
  ffmpeg -i video.mp4 -c:v libx264 -preset slow -crf 5 -c:a copy -maxrate 5000 -bufsize 11000 video.mpg
  </code></pre>
  
  <p>Thanks,</p>