请斑竹一定要帮帮我这个快要急死的人！我得问题如下：我现在需要将mpeg1、mpeg2和vob的片源制作成支持ISMA的mpeg4格式。我使用Divx5.02pro、xmpeg、QuickTime pro、VirtualDub和mpeg4ip提供的工具制作mpeg4的文件时，整个过程我是这个做的：首先将片源用xmpeg工具拆分成视频avi的Divx5文件和音频wav文件。然后用QuickTime将wav的音频文件转换成mp4文件，最后用mpeg4ip工具中的mp4creator60将两个文件合并。但是放出来的图象一开始是停的而只是声音播放，等到声音播放结束了画面才动起来。我不知道是什么地方出错了。我想请教有没有懂这方面的高手给我指点一下，应该怎么来做这个支持ISMA方式的mpeg4文件？特别是具体细节和注意事项！小弟先谢了！
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Creating compatible Mpeg-4 audio/video files with DivX 5, Virtualdub, Apple
QuickTime6 and Mpeg4IP:
It is possible to create Mpeg-4 compliant audio/video files using DivX 5 and
other useful tools, following these steps:
Create the audio/video file using the current version 5.02 of DivX.
Two versions are available for Windows users: DivX basic, which is available
for free and DivXPro, which offers more options, but it comes with
advertisement software enclosed in the same package or if you don't want
ads, you have to pay 30 Us Dollars.The DivXPro version has three more Mpeg-4 Tools, compared to the simple DivX
codec.
In addition to that, the pro version is able to write .mp4 files directly,
but this feature is not very useful if you want to get fully mpeg-4
compliant files.DivX created mpeg-4 files cannot be played by Apple QuickTime6 or the
Envivio plugin. Only Dicas Mpegable player and Mp4Player seem to be able to
play them.In addition, Divx does not create audio in the AAC format. The only audio
format permitted is MP3.It is recommended not to use the extra Mpeg-4 tools of the Pro version of
DivX (leaving the three corresponding boxes unchecked) to keep the maximum
compatibility of the video files with Mp4player, QuickTime6 and Envivio
plugin. These options causes colored shades to appear in the picture
whenever files are played by a non-Divx player.Thus, the DivX basic version performs well enough for our purpose.
Once you have an avi DivX file we can use Virtualdub (I use the current
version 4.10), a powerful video editor and video capture program to edit an
avi or mpeg-1 video file without the need of recompression, so that you
avoid signal impairment during the editing process. Virtualdub is also
capable of saving avi video and wav audio separately. To do that, load the
video/audio file from open video file in the file menu. In order to save
video, in the audio menu, select no audio, while in the video menu, select
direct stream copy. Finally in the File menu, select save as avi typing the
new video-only file name. For extracting audio, just load the original file
again and choose save Wav from the file menu. You must choose a name for the
wav file.The next step now, is the creation of a mp4 file from the wav audio. If you
have the Pro version of QuickTime6Pro, you can open the wav audio file that
you have previously extracted from file\open movie, Inside the dialog box
displayed, select audio file for file of type and choosing Export in the
file menu again, select options to adjust bitrate mono/stereo and other
settings of the mp4 aac audio file, finally press save and you should get an
audio only mp4 file.
If you don't have the Pro version of QuickTime6 which costs 29.99 Us Dollars
unlike the free QuickTime6 player, you can use Faac encoder, which is
available for free, to convert uncompressed pcm wav files to .aac audio.Another option is to use the avi2raw to extract the raw audio data, use a
tool to translate the mp3 to raw PCM, then feed that raw PCM to faac.It has been discovered that files created with QuickTime6Pro, are not played
correctly by Dicas Mpegable Player, which fails to play audio.If the second procedure described below is adopted, mp4 files are played
smoothly by almost any of the Mpeg-4 players considered in my trial, except
Philips CinePlayer.While converting wav to aac, make sure that Faac is set to low complexity
profile and Mpeg-4 file version (not Mpeg-2) is selected. This eliminates
some incompatibility problems with Quicktime6 and Envivio players.This is an example of Faac command-line usage:
In the example above Faac encoder is set to create an Mpeg-4 type file
header, low complexity profile, a cutoff frequency of 18000 Hz and a bitrate
of 64 Kbit/s per channel aac audio file from the original wav file.A GUI interface to the faac encoder package is also available (this
interface is not included with mpeg4ip)Once an .aac file is created, you can use mp4creator to insert the audio
into an mp4 file. The following command line is used: mp4creator -createUsing the Mp4UI Windows user interface for Mp4Creator is also possible.
Once you have an audio mp4 file you need to add the video. Just use
Mp4creator to add the avi video-only Divx video track. It is very easy to
use the Mp4UI Windows user interface for Mp4Creator to open the mp4 file,
add the video track and optimize it, without the need of typing in the
command-line commands like this:
<mp4creator60 video.avi audio.mp4 optimize>
The mp4 A/V file should now be playable by QuickTime6, Envivio pluin for
Windows Media Player and RealOne, Dicas Mpegable player and by Mp4Player of
course.
You can use XviD encoder instead of DivX with the same result, but only
versions released on September 19, 2002 or later works properly.
Hinting.
To stream a file that has audio and video using a streaming server like the
Darwin streaming server, you will need to hint the file.
You can use the mp4creator's hint option. With this option, you need to
specify a track number. Use the mp4info utility to get this information.Track Type Info
1 od Object Descriptors
2 scene BIFS
201 video MPEG-4, 166.633 secs, 262 kbps, 320x240 @ 14.16 fps
101 audio MPEG-4, 166.528 secs, 49 kbps, 32000 Hz
Then use the mp4creator command line options to add the hint tracks:
mp4creator -hint=201 file.mp4
mp4creator -hint=101 file.mp4Software Websites:DivX video codec: www.divx.com
Virtualdub: www.virtualdub.org
QuickTime6 www.apple.com/quicktime
Mp4Creator www.mpeg4ip.net
Faac aac audio encoder www.audiocoding.com
Mp4 User Interface www.mediacruiser.de/mp4UI
Authors:Enrico Palmeri October 6, 2002
revised October 7, 2002
October 9, 2002
Bill May edited November 18, 2002
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