On 12/1/2011 2:19 AM, Tuan DN wrote:
Is there any atom of mp4 container which contain sound volume value?
Digital audio doesn't have volume any more than the transcript of a speech includes tone of voice.
The closest thing I could think of to what you're asking for would be to somehow reference an audio effects filter from within the stream, so that the downstream decompressor does the audio processing you need to increase the audio level.
A bit of quick Googling for QuickTime effects suggests that the 'geff' atom might be employed for this purpose, but that doesn't exist in the more tightly scoped MP4 format. (See http://www.mp4ra.org/atoms.html)
Ross is saying that you will probably have to decompress the audio, scale the samples, then recompress the resulting audio stream. You're not going to find a byte to diddle in the stream to magically boost the volume.
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