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@无名啊，可能那个视频已经被妥善压缩过了。我用默认参数压缩的手机拍摄的 4K60FPS 视频，体积从 104MB 压缩至 5MB，但画质大幅降低了。

我也没找到比较完整的帮助文档，只找到了这个：

~ $ ffmpeg -hide_banner -h encoder=hevc_mediacodec
Encoder hevc_mediacodec [H.265 Android MediaCodec encoder]:
    General capabilities: dr1 delay hardware
    Threading capabilities: none
    Supported hardware devices: mediacodec
    Supported pixel formats: mediacodec yuv420p nv12
hevc_mediacodec AVOptions:
  -ndk_codec         <boolean>    E..V....... Use MediaCodec from NDK (default auto)
  -codec_name        <string>     E..V....... Select codec by name
  -bitrate_mode      <int>        E..V....... Bitrate control method (from -1 to INT_MAX) (default -1)
     cq              0            E..V....... Constant quality mode
     vbr             1            E..V....... Variable bitrate mode
     cbr             2            E..V....... Constant bitrate mode
     cbr_fd          3            E..V....... Constant bitrate mode with frame drops
  -pts_as_dts        <boolean>    E..V....... Use PTS as DTS. It is enabled automatically if avctx max_b_frames <= 0, since most of Android devices don't output B frames by default. (default auto)
  -level             <int>        E..V....... Specify tier and level (from 0 to INT_MAX) (default 0)
     m1              1            E..V....... Main tier level 1
     h1              2            E..V....... High tier level 1
     m2              4            E..V....... Main tier level 2
     h2              8            E..V....... High tier level 2
     m2.1            16           E..V....... Main tier level 2.1
     h2.1            32           E..V....... High tier level 2.1
     m3              64           E..V....... Main tier level 3
     h3              128          E..V....... High tier level 3
     m3.1            256          E..V....... Main tier level 3.1
     h3.1            512          E..V....... High tier level 3.1
     m4              1024         E..V....... Main tier level 4
     h4              2048         E..V....... High tier level 4
     m4.1            4096         E..V....... Main tier level 4.1
     h4.1            8192         E..V....... High tier level 4.1
     m5              16384        E..V....... Main tier level 5
     h5              32768        E..V....... High tier level 5
     m5.1            65536        E..V....... Main tier level 5.1
     h5.1            131072       E..V....... High tier level 5.1
     m5.2            262144       E..V....... Main tier level 5.2
     h5.2            524288       E..V....... High tier level 5.2
     m6              1048576      E..V....... Main tier level 6
     h6              2097152      E..V....... High tier level 6
     m6.1            4194304      E..V....... Main tier level 6.1
     h6.1            8388608      E..V....... High tier level 6.1
     m6.2            16777216     E..V....... Main tier level 6.2
     h6.2            33554432     E..V....... High tier level 6.2

$ ffmpeg -hwaccel mediacodec -an -i /storage/emulated/0/DCIM/Camera/VID_20230725_194612.mp4 -c:v hevc_mediacodec /storage/emulated/0/DCIM/Camera/VID_20230725_194612_test.mp4 ...... frame= 1001 fps=106 q=-0.0 Lsize= 4558kB time=00:00:16.66 bitrate=2240.6kbits/s speed=1.76x video:4553kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.109314%

此系统上有以下睡眠状态: 待机 (S0 低电量待机) 连接的网络休眠快速启动此系统上没有以下睡眠状态: 待机 (S1) 系统固件不支持此待机状态。当支持 S0 低电量待机时，禁用此待机状态。待机 (S2) 系统固件不支持此待机状态。当支持 S0 低电量待机时，禁用此待机状态。待机 (S3) 系统固件不支持此待机状态。当支持 S0 低电量待机时，禁用此待机状态。混合睡眠待机(S3)不可用。虚拟机监控程序不支持此待机状态。