gpu – 使用libavcodec进行硬件加速

2023年5月12日 524次阅读

我已经下载了一个软件(
info-beamer),我想使用GPU加速来解码H.264视频.我知道我的平台能够使用GPU解码H.264视频.我使用以下命令使用gstreamer执行了一些测试,视频播放流畅而没有太多CPU使用：

gst-launch-1.0 filesrc location=./Sintel.mp4 ! qtdemux ! vaapidecode ! vaapisink

但是当我使用info-beamer播放相同的视频时,使用了100％的CPU.我认为如果可用的话,libavcodec会自动使用VAAPI ……我应该使用另一个库吗？我究竟做错了什么？

我的平台正在运行带有intel HD的Atom E3826并安装了Ubuntu 14.04.

编辑：

我想我安装了所有必需的库：

nap@nap:~$dpkg -l | grep libva
ii  libva-dev:amd64                             1.3.0-2                                             amd64        Video Acceleration (VA) API for Linux -- development files
ii  libva-drm1:amd64                            1.3.0-2                                             amd64        Video Acceleration (VA) API for Linux -- DRM runtime
ii  libva-egl1:amd64                            1.3.0-2                                             amd64        Video Acceleration (VA) API for Linux -- EGL runtime
ii  libva-glx1:amd64                            1.3.0-2                                             amd64        Video Acceleration (VA) API for Linux -- GLX runtime
ii  libva-intel-vaapi-driver                    1.3.0-1ubuntu1                                      all          VAAPI driver for Intel G45 & HD Graphics family (transitional package)
ii  libva-tpi1:amd64                            1.3.0-2                                             amd64        Video Acceleration (VA) API for Linux -- TPI runtime
ii  libva-wayland1:amd64                        1.3.0-2                                             amd64        Video Acceleration (VA) API for Linux -- Wayland runtime
ii  libva-x11-1:amd64                           1.3.0-2                                             amd64        Video Acceleration (VA) API for Linux -- X11 runtime
ii  libva1:amd64                                1.3.0-2                                             amd64        Video Acceleration (VA) API for Linux -- runtime
nap@nap:~$dpkg -l | grep vaapi
ii  gstreamer1.0-vaapi:amd64                    0.5.7-0ubuntu4                                      amd64        VA-API plugins for GStreamer
ii  libgstreamer-vaapi1.0-0:amd64               0.5.7-0ubuntu4                                      amd64        GStreamer libraries from the "vaapi" set
ii  libva-intel-vaapi-driver                    1.3.0-1ubuntu1                                      all          VAAPI driver for Intel G45 & HD Graphics family (transitional package)

这是vainfo的输出：

nap@nap:~$sudo vainfo 
error: XDG_RUNTIME_DIR not set in the environment.
libva info: VA-API version 0.35.0
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
libva info: Found init function __vaDriverInit_0_35
libva info: va_openDriver() returns 0
vainfo: VA-API version: 0.35 (libva 1.3.0)
vainfo: Driver version: Intel i965 driver - 1.3.0
vainfo: Supported profile and entrypoints
      VAProfileMPEG2Simple            : VAEntrypointVLD
      VAProfileMPEG2Simple            : VAEntrypointEncSlice
      VAProfileMPEG2Main              : VAEntrypointVLD
      VAProfileMPEG2Main              : VAEntrypointEncSlice
      VAProfileH264ConstrainedBaseline: VAEntrypointVLD
      VAProfileH264ConstrainedBaseline: VAEntrypointEncSlice
      VAProfileH264Main               : VAEntrypointVLD
      VAProfileH264Main               : VAEntrypointEncSlice
      VAProfileH264High               : VAEntrypointVLD
      VAProfileH264High               : VAEntrypointEncSlice
      VAProfileVC1Simple              : VAEntrypointVLD
      VAProfileVC1Main                : VAEntrypointVLD
      VAProfileVC1Advanced            : VAEntrypointVLD
      VAProfileNone                   : VAEntrypointVideoProc
      VAProfileJPEGBaseline           : VAEntrypointVLD

最佳答案 仍在努力,我错误地认为硬件编解码器是AVCodec =>事实并非如此. AVHWAccel绑定到上下文它不是直接编解码器…所以avcodec_find_decoder_by_name(“h264_vaapi”)不会返回任何内容.

info-beamer不支持硬件解码编解码器(h264_vaapi)：

video.c代码：

video-> codec = avcodec_find_decoder(video-> codec_context-> codec_id);

我补充道

    if (video->codec_context->hwaccel != NULL)
      {
        fprintf(stderr, "HW accel IN USE : %s\n", video->codec_context->hwaccel->name);
      }
    else
      {
        fprintf(stderr, "NO HW accel IN USE\n");
      }

and "NO HW accel IN USE\n" is displayed, while i checked previously that it is registered :

   fprintf(stderr,"\n hw Decoders\n");
    AVHWAccel *first_hwaccel   = av_hwaccel_next(NULL);
    fprintf(stderr,"%p", first_hwaccel);
    AVHWAccel *hwaccel = first_hwaccel; 
    AVHWAccel *h264 = NULL; 
    const char * h264_name = "h264_vaapi";
    while (hwaccel != NULL) 
      {
    if ( hwaccel != NULL)
      {
        fprintf(stderr,"%s ", hwaccel->name);
        if (strcmp(hwaccel->name, h264_name)== 0)
          {
        h264=hwaccel;
          }
      }
    hwaccel=av_hwaccel_next(hwaccel);

    if (hwaccel == first_hwaccel)
      {
        break;
      }
      }
    fprintf(stderr,"\n");

它显示：
 hw解码器
0x7f19af53fa80h263_vaapi h263_vdpau h264_vaapi h264_vdpau mpeg1_vdpau mpeg2_vaapi mpeg2_vdpau mpeg4_vaapi mpeg4_vdpau vc1_vaapi vc1_vdpau wmv3_vaapi wm3
_vdpau

所以libavcodec知道这些,但流beamer不使用它们.

video.c代码声称在标题中从avcodec_sample.0.5.0.c分叉…所以它不是由info-beamer团队完全编写的.

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