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MP4AVI读写的源代码 希望对初写者有用,欢迎大家来下载!

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          <td valign=top nowrap><p><b>'files with frozen frames'</b></td>
          <td><p>with some slow or bad SD cards Sanyo C1 video can freeze sometimes,
         use this option to exclude frozen fragments from target avi file.
         'save good fragments > msec [2000]' means that frozen fragment will
         be excluded, and the remaining part of video sample will be saved, if
         it is longer than 2000 msec (2 seconds)</td>
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      <br><br>
      <a name="adv"></a>
      <p><b>Advanced settings window:</b>
      <p><img src="adv.png" border=0>
      <br><br>
      <table border=0 cellspacing=0 cellpadding=0>
        <tr bgcolor=#F0F0F0>
          <td valign=top nowrap><p><b>'avi FourCC'</b></td>
          <td><p>FourCC is a changeable parameter in AVI header, it tells what codec to use
              for video decompression. In most cases, default values are suitable.
              <p>Select FourCC corresponding to input video type (i.e. for MJPEG from photo cameras,
                 only 'MJPG' is suitable, cause video is not recompressed)
          </td>
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        <tr>
          <td valign=top nowrap><p><b>'mono output'</b></td>
          <td><pUseful for Olympus C770 owners. Although it records sound as stereo, it's internal
            mic is mono. Check this option to downmix channels.</td>
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        <tr bgcolor=#F0F0F0>
          <td valign=top nowrap><p><b>'resample to 24000 Hz'</b></td>
          <td><p>Changes output sample rate to 24000 Hz (i.e. 48000 Hz -> 24000 Hz).</td>
        </tr>
        <tr>
          <td valign=top nowrap><p><b>'audio volume adjust, %'</b></td>
          <td><p>For cameras with quite sound. With value=100, audio volume is not affected.</td>
        </tr>
        <tr bgcolor=#F0F0F0>
          <td valign=top nowrap><p><b>'audio track delay, ms'</b></td>
          <td><p>For cameras with audio lag (i.e. Minalta A200). If audio comes earlier, set
            negative values</td>
        </tr>
        <tr>
          <td valign=top nowrap><p><b>'audio preload, ms'</b></td>
          <td><p>This is audio/video interleaving parameter, it doesn't affect video or audio data,
              but affects avi data layout. In most cases, default value '500' is suitable</td>
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        <tr bgcolor=#F0F0F0>
          <td valign=top nowrap><p><b>'lowpass filter'</b></td>
          <td><p>Great for Sanyo Xacti C1, makes it's sound softer.
           'Good' values are 4000 - 12000 for cutoff frequency
            and 2..4 for filter power.</td>
        </tr>
        <tr>
          <td valign=top nowrap><p><b>'crop video frames ...'</b></td>
          <td><p>Check it, if you want crop frames at the end of the file, if audio stream is shorter
            then video stream. When unchecked, audio silence will be inserted instead of cropping.
            If some of your files have no audio (Olympus C-770), uncheck this option, otherwise
            these files will be skipped.</td>
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        <tr bgcolor=#F0F0F0>
          <td valign=top nowrap><p><b>'keyframes slideshow'</b></td>
          <td><p>Check it to leave only keyframes in video stream (for Xacti C1, the result is a 2 fps slideshow with sound).
            I don't know where it can be useful, but it's funny :)
          </td>
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      </table>



      <br><br><br><br>
      <a name="howto"></a>
      <h2>How To ...</h2>
      <h3>... view movies from MPEG-4 camera on hardware DVD-MPEG4 player:</h3>
      <p>1. Copy .mp4 (.mov) files from your camera flash card to custom folder on your PC.
      <p>2. Run MP4Cam2AVI:
      <p>&nbsp;&nbsp;a) Main Menu -> Quick Settings -> Burn MPEG-4 movie to CD
      <br>&nbsp;&nbsp;b) set another target name, if necessary ('browse...' button)
      <br>&nbsp;&nbsp;c) push 'Start'
      <p>3. Burn target avi file to CD and watch on your DVD-MPEG4 player

      <h3>... edit video from MPEG-4 camera with avi editor (Adobe Premiere, Pinnacle Studio, etc.):</h3>
      <p>1. Install ISO MPEG-4 compatible VfW codec (see <a href="guide.htm">quick guide</a> for more details)
      <p>2. Run MP4Cam2AVI:
      <p>&nbsp;&nbsp;a) Main Menu -> Quick Settings -> Import to avi editing app
      <br>&nbsp;&nbsp;b) set another target directory, if necessary ('browse...' button)
      <br>&nbsp;&nbsp;c) push 'Start'
      <p>3. Import target avi files to your video editing app like standard DivX movies


      <br><br><br><br>
      <a name="faq"></a>
      <h2>FAQ:</h2>
      
      <p><b>Why should I convert .MP4|.MOV files from my camera to .AVI format?</b>
      <p class=m>To use them with video editing software - MP4 file format is not supported by 
                 most of video editing programs (i.e. Adobe Premiere, Pinnacle Studio etc.).
      <p class=m>To play them with hardware DVD-MPEG4 players (they don't understand .mp4 files)

      <p><b>I can't view converted avi file with Windows Media Player. What's wrong?</b>
      <p class=m>To view MPEG-4 movie, you should install <b>MPEG-4</b> compatile codec (DivX, XviD, 3ivX). See <a href="guide.htm">quick guide</a> for more details.
      <p class=m>To view MJPEG avi file, you should install <b>MJPEG</b> video codec, (i.e. <a href="http://www.free-codecs.com/Motion_JPEG_Codec_download.htm" target="_blank">Morgan Multimedia MJPEG codec</a>).
                 <br>VirtualDub has it's own MJPEG decoder, so it doesn't need any codec to understand MJPEG avi files.

      <p><b>I can't import converted MPEG4 AVI file to Adobe Premiere (Pinnacle Studio, etc.), while Media Player plays it fine. What's wrong?</b>
      <p class=m>To import avi files to avi editing app, you should have Video for Windows (VfW) ISO MPEG-4 compatible codec installed.
                 Directshow codecs, such as those used by Windows Media player, are not suitable. DivX codec is recommended 
                 (see <a href="guide.htm">quick guide</a> for more details)

      <p><b>I'd like only to convert files, not to join them, but MP4Cam2AVI joins them to one file...</b>
      <p class=m>MP4Cam2AVI has two operation modes:
      <br>1. Many MP4(MOV) -> One AVI (default)
      <br>2. Many MP4(MOV) -> Many AVI
      <p class=m>In second mode, each mp4(mov) file will be converted to the same-named .avi file.

      <p><b>How to determine whether my .mov files are MPEG-4 or MJPEG?</b>
      <p class=m>In MP4Cam2AVI, click file name and see 'file information'.
      
      <p><b>Why target avi file is so large?</b>
      <p class=m>Check audio format option. When it is set to 'PCM', audio is stored without compression.
                 Use 'MP3' or 'Source audio' option to get smaller file.
      
      <p><b>Does MP4Cam2AVI re-encode audio?</b>
      <p class=m>If you choose 'Source audio' option - audio is not re-encoded, but be careful - 
                 some programs and hardware mpeg4-dvd players won't work with these files. Also
                 you can convert audio to PCM (best fo further editing) or MP3.

      <p><b>There are many video converting apps. Why should I use MP4Cam2AVI?</b>
      <p class=m>1. Unlike other video converting apps, MP4Cam2AVI doesn't re-encode video, it means no video quality loss and
                much faster operation (~5..20x realtime) than other converters
                 with video recompression (cause video compression requires much CPU time).
      <p class=m>2. It fixes audio/video sync issue. Audio and video lengths in MP4 video fragments
                 are not exactly the same (i.e. for Sanyo/Fisher C1, audio is ~50ms shorter).
                 When you join many video fragments, you will have audio/video desync increasing
                 to the end of the target file. MP4Cam2AVI solves this problem - it inserts
                 silence when audio stream ends or crops 'silent' frames at the end of each
                 fragment.


        
      <br><br><br><br>
      <a name="inc"></a>
      <h2>Included software:</h2>
      
      <p>1. libfaad2.dll GPL library (a part of FAAD 2.0 project) - used for AAC decompression.
            For more info about FAAD visit <a href="http://www.audiocoding.com" target="_blank">www.audiocoding.com</a>
      <p>2. lame_enc.dll GPL library (a part of L.A.M.E project) - used for mp3 compression.
            For more info visit <a href="http://lame.sourceforge.net" target="_blank">lame.sourceforge.net</a>
      
      
      
      
      
      <br><br><br><br>
      
      <p><b>&copy; Mikheev Oleg 2004-2005; All Rights Reserved</b>
      <p><b>web:</b>  <a href="http://graywolf.nm.ru" target="_blank">http://graywolf.nm.ru</a>
      <p><b>e-mail:</b> <a href="mailto:[e-mail]">[e-mail]</a>
      
      
      <br><br>
      <p class=sm>KEYWORDS: mp4 (aac) to avi (mp3) conversion, digital mpeg4 camcorders, freeware and open source mp4 to avi converter, 
      mp4 to avi conversion and joining tool with no video recompression, direct stream copy mov to avi convert, mov2avi, mp42avi, 
      mp4toavi, pass mp4 to avi, quicktime to avi, mp4 file problem, how to edit mp4 files.

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