----- Original Message -----
From: "Novák, Attila" <[email protected]>
To: <[email protected]>
Sent: Tuesday, October 08, 2013 7:51 AM
Subject: Re: [Libav-user] directshow resolution
On 8 October 2013 13:01, Novák, Attila <[email protected]> wrote:
Hi,
I have a Leadtek capture card that provides DirectShow output. I managed to record video in multiple resolutions using the command
line ffmpeg tool by providing the "-s widthXheight" option. Unfortunately I could not replicate the results from code: it always
captures with the default 320x200 resolution. I tried calling av_opt_set_image_size() & av_opt_set() with the "image_size" option
on the input format context struct before & after opening the codec, but it didn't work.
I couldn't find any documentation whatsoever on this feature. Does anyone know
how this supposed to work?
(I'm on WinXP with Visual Studio 2010, the card is a Leadtek WinFast VC100)
Thank you in advance,
-Attila
AVDictionary* pOptions = NULL;
char videoSize [] = "640x480"; // whatever size or sizes your camera supports
av_dict_set (&pOptions,"video_size",videoSize,0);
Getting the resolutions for a camera is not well supported in ffmpeg. You can do something like parsing the av_log callback but this
is silly. I think there are structures in place for better camera feedback but I don't think it's implemented. I currently do this
internal to my own app.
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