Opening dshow with avformat_open_input?

[myle00]

Hi,

I'm trying to open a dshow device using avformat_open_input and I'm having trouble figuring out where to put what, avformat_open_input always returns error -5, EIO. The device works fine in ffplay.exe

Here's the example code:

Code: Select all

av_register_all();
   avdevice_register_all();
   AVInputFormat * a= av_find_input_format("dshow");
   AVDictionaryEntry *ad= new AVDictionaryEntry;
   AVDictionary *d= new AVDictionary;
   d->count= 1;
   d->elems= ad;
   ad->value= "Laptop Integrated Webcam";
   ad->key= "video";

   int r;
   // Open the video file
   if((r= avformat_open_input(&m_pFormatCtx, "video=\"Laptop Integrated Webcam\"", a, &d))!=0)

I have tried to make filename an empty string but that didn't help. And making the dictionary NULL didn't work either.

Thanks for any help,
M

[myle00]

Agggghhhhh. Never mind, this worked:

Code: Select all

avformat_open_input(&m_pFormatCtx, "video=Laptop Integrated Webcam", a, NULL)

It was the double quotes.

[streaming]

Hi,

I tried your solution, but failed.
my example code is:
AVFormatContext *pFormatCtx;
av_register_all();
AVInputFormat * a= av_find_input_format("dshow");
avformat_open_input(&pFormatCtx, "video=Mercury USB2.0 Camera", a, NULL);

How can I fix it?

[rogerdpack]

http://libav-users.943685.n4.nabble.com ... 46231.html may be useful, though I'm grasping at straws...or maybe https://gist.github.com/3210277