if(ioctl(video_fd,VIDIOC_QUERYCAP,&caps)==-1){ perror("Failed to query device capabilities"); close(video_fd); exit(EXIT_FAILURE); } if(!(caps.capabilities&V4L2_CAP_VIDEO_CAPTURE)){ fprintf(stderr,"Device does not support video capture\n"); close(video_fd); exit(EXIT_FAILURE); } ...
通过加载/komod/g_multi_uvc.ko驱动模块,/dev/路径下出现了video0设备,通过ffmpeg的api:/*AVInputFormat *inputFmt = av_find_input_format("video4linux2");avformat_open_input(&pFormatCtx, "/dev/video0", inputFmt, NULL);*/报错[video4linux2,v4l2 @ 0x155ed30] Not a video capture device求大...
It’s not sufficient just to throw away the corrupted buffers as I have noticed that the first few legitimate buffers appear at slightly irregular time intervals leading to FFmpeg spewing out a bunch of warnings for the duration of the capture. In my tests around 3 buffers have to be ignored...
libv4l2: error getting capabilities: Inappropriate ioctl for device VIDEOIO ERROR: V4L: device ../../NurSpur.avi: Unable to query number of channels Seems to be a problem related tolibv4l2/V4L, maybe togstreamer. Both are installed, so the problem must be in OpenCV right? FFMPEGis also ...
video4linux2, v4l2 vfwcap x11grab decklink Libavdevice支持以下设备作为输出端: alsa caca decklink fbdev opengl oss pulse sdl sndio xv libavdevice使用 计划记录两个基于FFmpeg的libavdevice类库的例子,分成两篇文章写。本文记录一个基于FFmpeg的Libavdevice类库读取摄像头数据的例子。下一篇文章记录一个基于FFmpeg的Li...
打开摄像头设备*/ video_fd=open(DEVICE_NAME,O_RDWR); if(video_fd<0)return -1; /*2. 设置摄像头支持的颜色格式和输出的图像尺寸*/ struct v4l2_format video_formt; memset(&video_formt,0,sizeof(struct v4l2_format)); video_formt.type=V4L2_BUF_TYPE_VIDEO_CAPTURE; /*视频捕获设备*/ video...
打开摄像头设备*/ video_fd=open(DEVICE_NAME,O_RDWR); if(video_fd<0)return -1; /*2. 设置摄像头支持的颜色格式和输出的图像尺寸*/ struct v4l2_format video_formt; memset(&video_formt,0,sizeof(struct v4l2_format)); video_formt.type=V4L2_BUF_TYPE_VIDEO_CAPTURE; /*视频捕获设备*/ video...
在Linux平台上可以使用video4linux2打开视频设备;在MacOS上,可以使用avfoundation打开视频设备,这里不再详述。 代码 下面直接贴上程序代码: /** * 最简单的基于FFmpeg的AVDevice例子(读取摄像头) * Simplest FFmpeg Device (Read Camera) * * 雷霄骅 Lei Xiaohua ...
This works fine on libx264 and it works fine with h264_nvenc on my main PC but i would prefer using h264_v4l2m2m. It also does not happen to all videos just some. Additionally it encodes fine if i do not vstack the image onto it. its only when vstacking the image on it does ...
(h264_v4l2m2m)) Press [q] to stop, [?] for help [h264_v4l2m2m @ 0x55c654a450] <<< v4l2_encode_init: fmt=12/-1 [h264_v4l2m2m @ 0x55c654a450] Using device /dev/video11 [h264_v4l2m2m @ 0x55c654a450] driver 'bcm2835-codec' on card 'bcm2835-codec-encode' in mplane mode...