[FFmpeg-user] Problem capturing from 64ch SoundFlower on OSX

[Piers O'Hanlon]

On 9 Jul 2015, at 18:48, Carl Eugen Hoyos wrote:

> On Thursday 09 July 2015 06:48:42 pm Piers O'Hanlon wrote:
>> Hi,
>> I've been trying to capture multiple audio channels using ffmpeg on OSX -
>> specifically I've been trying to capture from the Soundflower 64 channel
>> input device
> 
> Just being curious: Is this hardware or software?
> 
It's a software virtual audio driver which takes the form of an open source kernel module in OSX:
https://github.com/RogueAmoeba/Soundflower

>> configuration: --cc=clang
> 
> Unrelated: This should make no difference, I suggest to remove it.
> 
This is currently necessary to get the avfoundation support to build on OSX10.7. I'm not sure if the configure script is broken or just OSX default gcc on my system... I think it is because the avfoundation configure check assumes gcc can compile c++.

>> [avfoundation @ 0x7f8dfb83d800] Failed to open codec in av_find_stream_info
> 
> This is the relevant error, please test attached patch.
> 
I applied your patch and it all works on 64 channels - that's great. I see that it was just question of increasing some #defines which is handy. Can this patch go into the main code?


> Note that -map_channel is deprecated, please use the pan filter.
> 
Ok - thanks I've got it working with pan too - seems to work about the same.

BTW I"m running the clients on embedded ARMv6 (Raspberry Pi) - any tips for reducing the load on the receiver?

Many thanks,

Piers

> Carl Eugen
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