AAC sound cut in the video

Discuss about generic usage of MediaCoder.

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chernals
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Joined: Mon Jun 21, 2010 8:34 pm

AAC sound cut in the video

Post by chernals » Sun Jan 23, 2011 4:24 am

Hi,

I am using Medicoder command line to transform a large set of video trailers encoded in various formats. The target format is MP4 (H.264) with AAC sound track.

Here is the command line i am using :

mc.exe -width 720 -height 400 -vbitrate 1000 -fps 25 -abitrate 128 -preset aac.xml -o file.mp4 sourceFile.xxx

where aac.xml is :

<MediaCoderPrefs>
<node key="overall.audio.enabled" value="true"/>
<node key="overall.audio.autoSource" value="false"/>
<node key="overall.audio.source" value="MPlayer"/>
<node key="overall.video.enabled" value="true"/>
<node key="overall.container.external" value="Enabled"/>
<node key="overall.audio.format" value="LC-AAC"/>
</MediaCoderPrefs>

It works but on 1/4 of the video files, the sound is cut after a few seconds (not constant, between 10 and 120 sec). Once the sound is cut, it does not come back.

What is really strange is that this behaviour is not constant. Sometimes, on the same videofile, it works well and sometimes i have the "sound cut".

I tried on another computer and i have the same behaviour.

I am using version 1.5.4700 of MC.

Do you have any hints of the source of that problem?
Do not hesitate to ask questions.

I am not a pro in video encoding, I reallly need help ;-)

Thanks in advance.

Christian.

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