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

phuzE phuze9 at gmail.com
Thu Apr 11 14:04:22 CEST 2013

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.
> _______________________________________________
> Libav-user mailing list
> [hidden email] <http://user/SendEmail.jtp?type=node&node=4657240&i=0>
> http://ffmpeg.org/mailman/listinfo/libav-user
> ------------------------------
>  If you reply to this email, your message will be added to the discussion
> below:
> http://libav-users.943685.n4.nabble.com/Encoding-a-screenshot-into-a-video-using-FFMPEG-tp4657231p4657240.html
>  To unsubscribe from Encoding a screenshot into a video using FFMPEG, click
> here<http://libav-users.943685.n4.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=4657231&code=cGh1emU5QGdtYWlsLmNvbXw0NjU3MjMxfC05NjM0NDkwOTQ=>
> .
> NAML<http://libav-users.943685.n4.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml>

View this message in context: http://libav-users.943685.n4.nabble.com/Encoding-a-screenshot-into-a-video-using-FFMPEG-tp4657231p4657249.html
Sent from the libav-users mailing list archive at Nabble.com.

More information about the Libav-user mailing list