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Decoder

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Nyanmisaka edited this page Mar 7, 2024 · 11 revisions

Decoder

Overview

The codecs, profiles, levels, bitrates, resolutions, FPS, AFBC, etc. supported by MPP decoders depend on the specific chip capabilities. This chapter uses RK3588 for demonstration.

 V..... av1_rkmpp            Rockchip MPP (Media Process Platform) AV1 decoder (codec av1)
 V..... h263_rkmpp           Rockchip MPP (Media Process Platform) H263 decoder (codec h263)
 V..... h264_rkmpp           Rockchip MPP (Media Process Platform) H264 decoder (codec h264)
 V..... hevc_rkmpp           Rockchip MPP (Media Process Platform) HEVC decoder (codec hevc)
 V..... mpeg1_rkmpp          Rockchip MPP (Media Process Platform) MPEG1VIDEO decoder (codec mpeg1video)
 V..... mpeg2_rkmpp          Rockchip MPP (Media Process Platform) MPEG2VIDEO decoder (codec mpeg2video)
 V..... mpeg4_rkmpp          Rockchip MPP (Media Process Platform) MPEG4 decoder (codec mpeg4)
 V..... vp8_rkmpp            Rockchip MPP (Media Process Platform) VP8 decoder (codec vp8)
 V..... vp9_rkmpp            Rockchip MPP (Media Process Platform) VP9 decoder (codec vp9)

Query decoders

  • Query MPP decoders
./ffmpeg -hide_banner -decoders | grep rkmpp
  • Query MPP decoder options by name
./ffmpeg -hide_banner -h decoder=h264_rkmpp
Decoder h264_rkmpp [Rockchip MPP (Media Process Platform) H264 decoder]:
    General capabilities: delay avoidprobe hardware
    Threading capabilities: none
    Supported hardware devices: rkmpp
    Supported pixel formats: nv12 nv16 nv15 nv20 drm_prime
h264_rkmpp_decoder AVOptions:
  -deint             <boolean>    .D.V....... Enable IEP (Image Enhancement Processor) for de-interlacing (default true)
  -afbc              <int>        .D.V....... Enable AFBC (Arm Frame Buffer Compression) to save bandwidth (from 0 to 2) (default off)
     off             0            .D.V....... Disable AFBC support
     on              1            .D.V....... Enable AFBC support
     rga             2            .D.V....... Enable AFBC if capable RGA is available
  -fast_parse        <boolean>    .D.V....... Enable fast parsing to improve decoding parallelism (default true)
  -buf_mode          <int>        .D.V....... Set the buffer mode for MPP decoder (from 0 to 1) (default half)
     half            0            .D.V....... Half internal mode
     ext             1            .D.V....... Pure external mode

Test decoders

You are free to choose sample videos. If none are available, you can try Jellyfish Video Bitrate Test Files.

The -c:v h264_rkmpp -i INPUT can be omitted since in FFmpeg 6.0 and up, -hwaccel rkmpp will pick up the required decoder automatically.

  • Decode but not copy-back. Without AFBC (ARM Frame Buffer Compression).
./ffmpeg -stream_loop -1 -hwaccel rkmpp -hwaccel_output_format drm_prime -i /path/to/any-h264-video.mp4 -an -sn -vframes 5000 -f null -
  • Decode and copy-back. Without AFBC. (AFBC cannot be used with copy-back or hwdownload filter)
./ffmpeg -stream_loop -1 -hwaccel rkmpp -i /path/to/any-h264-video.mp4 -an -sn -vframes 5000 -f null -
  • Decode but not copy-back. With AFBC.
./ffmpeg -stream_loop -1 -hwaccel rkmpp -hwaccel_output_format drm_prime -afbc 1 -i /path/to/any-h264-video.mp4 -an -sn -vframes 5000 -f null -
  • Decode but not copy-back. With AFBC if RGA3 is available.
./ffmpeg -stream_loop -1 -hwaccel rkmpp -hwaccel_output_format drm_prime -afbc rga -i /path/to/any-h264-video.mp4 -an -sn -vframes 5000 -f null -
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