[Libav-user] Querying v4l2 devices

[Lukasz Marek]

On 17.09.2016 00:08, Lukasz Marek wrote:
> I guess input device private data is not initialized, try to add this
> code right after formatContext->iformat=inputFormat, just replace s with
> formatContext
>
>     if (s->iformat->priv_data_size > 0) {
>         s->priv_data = av_mallocz(s->iformat->priv_data_size);
>         if (s->iformat->priv_class) {
>             *(const AVClass**)s->priv_data= s->iformat->priv_class;
>             av_opt_set_defaults(s->priv_data);
>         }
>     } else
>         s->priv_data = NULL;
>
>
> Maybe ff_alloc_input_device_context function should be moved to
> libavdevice's public API

Ignore this answer, it should work but manipulates private fields
You should use avdevice_list_input_sources. If still not working then 
please attach some *.c file so i can test it locally.