[Libav-user] Encoding a screenshot into a video using FFMPEG

[phuzE]

Hmm, that makes sense...though when I switch the order of the instructions
or remove av_image_alloc, I get an unhandled exception (at 0x6C9280EA
avcodec-55.dll access violation reading 0x.....). Thank you for taking the
time to help me by the way.


On Thu, Apr 11, 2013 at 12:42 AM, Steffen Ebersbach-2 [via libav-users] <
ml-node+s943685n4657240h24 at n4.nabble.com> wrote:

>
>  I'm wanting to grab the pixels from the screen, and encode that into a video.
> The screenshot will save fine to a bmp file, but when I try and cast it to
> work with encoding into a video, I get a swscale() src image error in my
> output and the video file is just a blank white/gray screen.  I made a topic
> on stackoverflow<http://stackoverflow.com/questions/15914012/encoding-a-screenshot-into-a-video-using-ffmpeg> <http://stackoverflow.com/questions/15914012/encoding-a-screenshot-into-a-video-using-ffmpeg>
> where you can see the source I'm using.
>
>
>
> I mad this for a longer time and now it works. I will look at my code
> later. But for the moment i think these two lines are wrong:
>
> avpicture_fill((AVPicture*)inpic, (uint8_t*)pPixels, PIX_FMT_BGR32, c->width, c->height);
> av_image_alloc(inpic->data, inpic->linesize, c->width, c->height, c->pix_fmt, 1);
>
> you first copy the screenshot from pPixels to the AVpicture inpic, but
> then allocat the AVpicture, so a empty frame gots to the encoder.
>
>
>
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