我目前正在尝试在 Windows 10 上使用 FFmpeg 在我的联想笔记本电脑上使用内置网络摄像头录制视频。我的目标之一是保持 CPU 使用率尽可能低，这就是为什么我想将 h264 编码推送到GPU。 现在我的笔记本电脑变得有点棘手。因为它使用两个GPU。第一个 GPU 是作为 CPU 一部分的 Intel HD 5500 图形单元。这最有可能用于要求不高的应用程序，例如办公室等，以节省能源。另一款是 AMD R5 M330，将用于游戏等图形密集型应用程序。
目前，我正在使用以下命令在 Intel HD GPU 上对网络摄像头流进行编码：
ffmpeg -f dshow -vcodec mjpeg -video_size 1280x720 -framerate 30 video="Lenovo EasyCamera":audio="Mikrofon (Realtek High Definition Audio)" -c:v h264_qsv -g 60 -q 28 -look_ahead 0 -preset:v faster -c:a aac -q:a 0.6 -r 30 output.mp4
到目前为止，这确实有效，但该 GPU 似乎没有足够的功率来跟上较高比特率或大量 i 帧的帧率。视频开始缺帧并跳帧。如果我使用 CPU 编码，一切都会顺利进行。
现在我的笔记本电脑有了第二个 AMD GPU，具有更多的功能，这将是一个很好的尝试在该 GPU 上进行编码，但我找不到任何有关如何在 Windows 10 上的 AMD 硬件上进行编码的信息。所以我的问题是: 使用 AMD 硬件进行 h264 编码的 ffmpeg 命令是什么样的？
当前版本的 ffmpeg 现在支持主要 GPU 供应商的硬件编码。以下是与 AMD 显卡一起使用的
h264_amfhevc_amfffmpeg -h fullh264_amf AVOptions:
-usage <int> E..V.... Encoder Usage (from 0 to 3) (default transcoding)
transcoding E..V.... Generic Transcoding
ultralowlatency E..V....
lowlatency E..V....
webcam E..V.... Webcam
-profile <int> E..V.... Profile (from 66 to 257) (default main)
main E..V....
high E..V....
constrained_baseline E..V....
constrained_high E..V....
-level <int> E..V.... Profile Level (from 0 to 62) (default auto)
auto E..V....
1.0 E..V....
1.1 E..V....
1.2 E..V....
1.3 E..V....
2.0 E..V....
2.1 E..V....
2.2 E..V....
3.0 E..V....
3.1 E..V....
3.2 E..V....
4.0 E..V....
4.1 E..V....
4.2 E..V....
5.0 E..V....
5.1 E..V....
5.2 E..V....
6.0 E..V....
6.1 E..V....
6.2 E..V....
-quality <int> E..V.... Quality Preference (from 0 to 2) (default speed)
speed E..V.... Prefer Speed
balanced E..V.... Balanced
quality E..V.... Prefer Quality
-rc <int> E..V.... Rate Control Method (from -1 to 3) (default -1)
cqp E..V.... Constant Quantization Parameter
cbr E..V.... Constant Bitrate
vbr_peak E..V.... Peak Contrained Variable Bitrate
vbr_latency E..V.... Latency Constrained Variable Bitrate
-enforce_hrd <boolean> E..V.... Enforce HRD (default false)
-filler_data <boolean> E..V.... Filler Data Enable (default false)
-vbaq <boolean> E..V.... Enable VBAQ (default false)
-frame_skipping <boolean> E..V.... Rate Control Based Frame Skip (default false)
-qp_i <int> E..V.... Quantization Parameter for I-Frame (from -1 to 51) (default -1)
-qp_p <int> E..V.... Quantization Parameter for P-Frame (from -1 to 51) (default -1)
-qp_b <int> E..V.... Quantization Parameter for B-Frame (from -1 to 51) (default -1)
-preanalysis <boolean> E..V.... Pre-Analysis Mode (default false)
-max_au_size <int> E..V.... Maximum Access Unit Size for rate control (in bits) (from 0 to INT_MAX) (default 0)
-header_spacing <int> E..V.... Header Insertion Spacing (from -1 to 1000) (default -1)
-bf_delta_qp <int> E..V.... B-Picture Delta QP (from -10 to 10) (default 4)
-bf_ref <boolean> E..V.... Enable Reference to B-Frames (default true)
-bf_ref_delta_qp <int> E..V.... Reference B-Picture Delta QP (from -10 to 10) (default 4)
-intra_refresh_mb <int> E..V.... Intra Refresh MBs Number Per Slot in Macroblocks (from 0 to INT_MAX) (default 0)
-coder <int> E..V.... Coding Type (from 0 to 2) (default auto)
auto E..V.... Automatic
cavlc E..V.... Context Adaptive Variable-Length Coding
cabac E..V.... Context Adaptive Binary Arithmetic Coding
-me_half_pel <boolean> E..V.... Enable ME Half Pixel (default true)
-me_quarter_pel <boolean> E..V.... Enable ME Quarter Pixel (default true)
-aud <boolean> E..V.... Inserts AU Delimiter NAL unit (default false)
-log_to_dbg <boolean> E..V.... Enable AMF logging to debug output (default false)
hevc_amf AVOptions:
-usage <int> E..V.... Set the encoding usage (from 0 to 3) (default transcoding)
transcoding E..V....
ultralowlatency E..V....
lowlatency E..V....
webcam E..V....
-profile <int> E..V.... Set the profile (default main) (from 1 to 1) (default main)
main E..V....
-profile_tier <int> E..V.... Set the profile tier (default main) (from 0 to 1) (default main)
main E..V....
high E..V....
-level <int> E..V.... Set the encoding level (default auto) (from 0 to 186) (default auto)
auto E..V....
1.0 E..V....
2.0 E..V....
2.1 E..V....
3.0 E..V....
3.1 E..V....
4.0 E..V....
4.1 E..V....
5.0 E..V....
5.1 E..V....
5.2 E..V....
6.0 E..V....
6.1 E..V....
6.2 E..V....
-quality <int> E..V.... Set the encoding quality (from 0 to 10) (default speed)
balanced E..V....
speed E..V....
quality E..V....
-rc <int> E..V.... Set the rate control mode (from -1 to 3) (default -1)
cqp E..V.... Constant Quantization Parameter
cbr E..V.... Constant Bitrate
vbr_peak E..V.... Peak Contrained Variable Bitrate
vbr_latency E..V.... Latency Constrained Variable Bitrate
-header_insertion_mode <int> E..V.... Set header insertion mode (from 0 to 2) (default none)
none E..V....
gop E..V....
idr E..V....
-gops_per_idr <int> E..V.... GOPs per IDR 0-no IDR will be inserted (from 0 to INT_MAX) (default 60)
-preanalysis <boolean> E..V.... Enable preanalysis (default false)
-vbaq <boolean> E..V.... Enable VBAQ (default false)
-enforce_hrd <boolean> E..V.... Enforce HRD (default false)
-filler_data <boolean> E..V.... Filler Data Enable (default false)
-max_au_size <int> E..V.... Maximum Access Unit Size for rate control (in bits) (from 0 to INT_MAX) (default 0)
-min_qp_i <int> E..V.... min quantization parameter for I-frame (from -1 to 51) (default -1)
-max_qp_i <int> E..V.... max quantization parameter for I-frame (from -1 to 51) (default -1)
-min_qp_p <int> E..V.... min quantization parameter for P-frame (from -1 to 51) (default -1)
-max_qp_p <int> E..V.... max quantization parameter for P-frame (from -1 to 51) (default -1)
-qp_p <int> E..V.... quantization parameter for P-frame (from -1 to 51) (default -1)
-qp_i <int> E..V.... quantization parameter for I-frame (from -1 to 51) (default -1)
-skip_frame <boolean> E..V.... Rate Control Based Frame Skip (default false)
-me_half_pel <boolean> E..V.... Enable ME Half Pixel (default true)
-me_quarter_pel <boolean> E..V.... Enable ME Quarter Pixel (default true)
-aud <boolean> E..V.... Inserts AU Delimiter NAL unit (default false)
-log_to_dbg <boolean> E..V.... Enable AMF logging to debug output (default false)
例如，
ffmpeg -i input.mkv -c:v hevc_amf -rc cqp -qp_p 0 -qp_i 0 -c:a copy output.mkv