[vlc-devel] Libvlc and imem trouble locating transcode module from raw to vorbis

[William King]

For future reference:

With some assistance I was able to get the raw audio input working by 
not having imem demux the audio stream, but instead having imem treat 
the audio as catagory 4(I think it was 'generic' data rather than audio 
or video) and then specifying the demuxer manually.

William King
Senior Engineer
Quentus Technologies, INC
1037 NE 65th St Suite 273
Seattle, WA 98115
Main:   (877) 211-9337
Office: (206) 388-4772
Cell:   (253) 686-5518
william.king at quentustech.com


On 06/14/2012 09:35 AM, William King wrote:
> In lines 409 through 419 it appears the es_format_t only has the codec 
> set from the --imem-codec param. If the format must also be set the it 
> seems the correct fix would be to add an --imem-format param that 
> would set the es_format_t.audio.i_format.
>
> Is anyone able to review? So far I have not found anything that would 
> take the codec specified and determine the i_format field, so this 
> appears to me to be the required solution.
> William King
> Senior Engineer
> Quentus Technologies, INC
> 1037 NE 65th St Suite 273
> Seattle, WA 98115
> Main:   (877) 211-9337
> Office: (206) 388-4772
> Cell:   (253) 686-5518
> william.king at quentustech.com  
>
> On 06/14/2012 09:02 AM, William King wrote:
>> Attached are the logs when I use --imem-codec=raw which fails to 
>> locate a transcode module, as well as the logs if I use 
>> --imem-codec=s16l which results in this line:
>> [0x7fc5d000f838] main decoder error: no suitable decoder module for 
>> fourcc `    '. VLC probably does not support this sound or video format.
>>
>> William King
>> Senior Engineer
>> Quentus Technologies, INC
>> 1037 NE 65th St Suite 273
>> Seattle, WA 98115
>> Main:   (877) 211-9337
>> Office: (206) 388-4772
>> Cell:   (253) 686-5518
>> william.king at quentustech.com
>>
>>
>> On 06/13/2012 11:01 PM, Rémi Denis-Courmont wrote:
>>> On Wed, 13 Jun 2012 22:45:19 -0700, William King
>>> <william.king at quentustech.com>  wrote:
>>>> I'm currently trying to use libvlc to handle transcoding and streaming
>>>> from a raw s16l audio source to one of the many streaming codecs that
>>>> libvlc supports. The problem I seem to be running into is that imem
>>>> requests the codec, but not the fourcc and the only codec accepted is
>>>> 'raw'. This appears to cause libvlc to be unable to locate a 
>>>> compatible
>>>> transcode module since all of the modules list s16l as the source
>>>> fourcc. After digging into the imem code and how the codec string is
>>>> handled, I don't see a way to specify from my application that the 
>>>> audio
>>>> fourcc is s16l.
>>>>
>>>> Is anyone able to shed some light on the situation?
>>> --imem-codec=s16l should do.
>>>
>>> Do you mean that es_format_t.audio.i_format is not set? That should 
>>> not be
>>> an issue out of imem, but maybe transcode has a bug.
>>>
>>> It's unfortunate that es_format_t has both i_codec and audio.i_format
>>> fields. But that's not easy to clean up.
>>>
>>
>>
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