[Libav-user] How to changes resolution to output file.

[ABDALLAH Moussa]

Thanks you for your help!
To change the bit_rate I have to use sw_scale too?

Le 27 févr. 2019 à 18:49, Michael Armes <michael.armes at gmail.com<mailto:michael.armes at gmail.com>> a écrit :

You need to scale *each frame* with sws_scale from lib_av (https://libav.org/documentation/doxygen/master/group__libsws.html#gae531c9754c9205d90ad6800015046d74). I suggest you look at the example code linked in the documentation for reference.

On Wed, Feb 27, 2019 at 9:38 AM ABDALLAH Moussa <Moussa.ABDALLAH at nexeya.com<mailto:Moussa.ABDALLAH at nexeya.com>> wrote:
Hello,

I am trying to record a stream video to a output file mkv. I set my camera with the resolution 1280x720 and I would like to change it with ffmpeg on my program how can I do that please ?

I have success to change the framerate but I failed  with the resolution or other option like bit_rate :

        ivst->r_frame_rate.num=25;
        ivst->r_frame_rate.den=1;
        ovst->r_frame_rate      = ivst->r_frame_rate;
        ovst->avg_frame_rate    = ovst->r_frame_rate;
        ivst->codec->bit_rate = 3000000;
        ovst->codec->bit_rate = 3000000;
        ivst->codec->height = 320;
        ivst->codec->width = 240;
        ovst->codec->height = 320;
        ovst->codec->width = 240;

Thanks you for your help !
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