[Live-devel] question about get a total mpeg file when using openRTSP

[=?gb2312?B?Y2hhbmdiaW54dQ==?=]

hello all,
    for some reason, i need to use "openRTSP" get a total mpeg1 file when i play a url like this: rtsp://*.*.*.*/mpeg1video.mpg,just the same as the "-4" option did to mp4 file. And now i  made some modifications to the source file: i make both the video and audio subsession write the data to the same file.
    But when i play this file, there is only video, no sound. so i want to know what is the matter?

    btw: when i use "-4" option to get a mp4 file(i write it to a file instead of stdout),i just cannot play it. any reason?
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