[FFmpeg-user] max bitrate for vob

[Rick C.]

> On 16 Sep 2015, at 9:11 PM, Andy Furniss <adf.lists at gmail.com> wrote:
> 
> Andy Furniss wrote:
>> Moritz Barsnick wrote:
>>> On Wed, Sep 16, 2015 at 05:38:30 +0800, Rick C. wrote:
>>>> Output #0, dvd, to '/Users/mahalko/Desktop/output.vob':
>>> [...]
>>>> Stream #0:1: Audio: ac3, 0 channels, 128 kb/s
>>> 
>>> And I'm not sure I understand the concept of zero channel audio
>>> streams. ;-)
>> 
>> There are valid uses in wav at least though ffmpeg doesn't like
>> them.
>> 
>> The case I am thinking of is ambisonic formats where 0 channels
>> indicates not for speakers (I beleive DTS and MPEH-H can also handle
>> this).
> 
> Having had more time to remember old tests and look at the wav spec I
> think that what was 0 was the dwChannelMask in the wav.
> 
> From the microsoft site
> 
> http://msdn.microsoft.com/en-us/windows/hardware/gg463006.aspx
> 
> If, for example in a multi-channel audio authoring application, no
> speaker location is desired on any of the mono streams, the
> dwChannelMask should explicitly be set to 0. A dwChannelMask of 0 tells
> the audio device to render the first channel to the first port on the
> device, the second channel to the second port on the device, and so on.
> This also means that if the device doesn't know how to process the raw
> audio streams, it should not accept the multi-channel stream with a
> dwChannelMask of 0. A device like a digital mixer or a digital audio
> storage device (hard disk, ADAT, and so on) might want to accept formats
> without particular speaker locations.
> 
> 
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Just want to say thanks for all the replies and help :-)