2019-04-17 11:37 GMT+02:00, Simone Donadini :
> When opening a media i need to check if the pixel format holds an alpha
> channel.
> I can check for the alpha flag in the pixel format description, like this:
> const AVPixFmtDescriptor *pixDesc = av_pix_fmt_desc_get(pix_format);
> bool has_alpha =
On 2019-04-17 9:03 a.m., Hristo Ivanov wrote:
Hi.
The implementation of
'avdevice_capabilities_create'(https://ffmpeg.org/doxygen/trunk/avdevice_8c_source.html#l00143)
starts with the following lines:
1 int ret; 2 av_assert0(s && caps); 3 av_assert0(s->iformat ||
s->oformat); 4 if
Hi Hristo,
thanks again for your support.
I tried with
avformat_open_input(_pFormatCtxInCam, szUrl, m_pInFrmt, nullptr)
which did not solve the issue. Same error as before.
Yes, m_pFormatCtxInCam->iformat->create_device_capabilities is nullptr in my
case.
Same is the case for
Hi.
The implementation of 'avdevice_capabilities_create'(
https://ffmpeg.org/doxygen/trunk/avdevice_8c_source.html#l00143) starts
with the following lines:
1int ret;
2av_assert0(s && caps);
3av_assert0(s->iformat || s->oformat);
4if ((s->oformat &&
Hi,
thank you for your support. Maybe you can help me a bit more:
I just tried the API, but without success.
The error is -40 (“function not implemented”) from
the function avdevice_capabilities_create. I use the libs/dlls released with
ffmpeg 4.1.0 on Windows 10. My project is build with
> Are the video streams 4K? My guest is you are running out of memory on the
>GPU.
No, the streams have HD resolution. I run my programm with debug log level and
here is output:
[h264 @ 013f85b22440] Failed setup for format cuda: hwaccel initialisation
returned error
[h264 @
Hi.
Sorry, I think I got it wrong in my previous reply:
> I think there is no way to retrieve the information using the FFMPEG API.
There is this:
https://ffmpeg.org/doxygen/trunk/structAVDeviceCapabilitiesQuery.html
Quoting the docs:
> Following API allows user to probe device capabilities
Hi,When opening a media i need to check if the pixel format holds an alpha channel.I can check for the alpha flag in the pixel format description, like this:const AVPixFmtDescriptor *pixDesc = av_pix_fmt_desc_get(pix_format);bool has_alpha = pixDesc->flags & AV_PIX_FMT_FLAG_ALPHA;But i noticed
Hi.
> Is it because of NVIDIA GPUs have concurrent session limitation?
There is a session limitation for encoding for sure, but I think there is
no such thing for decoding:
https://developer.nvidia.com/video-encode-decode-gpu-support-matrix
> By the way, I don't understand where these messages
Hi.
I think this is what you need:
https://www.ffmpeg.org/legal.html
Regards.
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Hello,
I wish to make a kind of converter software for audio files and starting to
sell it, and i was wondering if it's actually legal to using ffmpeg for this. I
don't want to edit any piece of code from ffmpeg, and just to use its features.
Can anyone help me with some more details?
Regards,
Hello everybody!
I configured ffmpeg to use hardware accelaration, built it and then wrote an
app that decodes h264 streams. Maximum number of streams (cameras) that can be
decoded is equal to 5. When I try to add one more camera I get errors:
[h264 @ 0181858aa3c0] Error creating a NVDEC
Hi,
probably I have to implement this functionality directly with Dshow in Windows
and v4l2 in Linux. So the output in the console comes from the backend and not
from ffmpeg?
Mit freundlichen Grüßen / Best regards
Sven Hans
DERMALOG Identification Systems GmbH
Systems Engineer
Mittelweg 120
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