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FAQ FFmpeg

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Vincent Fortier edited this page Sep 26, 2024 · 28 revisions

SynoCommunity package FFmpeg specific FAQ

FFmpeg provides a set of command line tools to process audio and video media files.

Commands are located in /usr/local/ffmpeg<version>/bin and libraries are required by other packages. In DSM 7.0, they are located in /volume1/@appstore/ffmpeg<version>/bin.

Symbolic links are made available thru /usr/local/bin as the following where the latest installed version will become default ffmpeg:

  • ffmpeg4
  • ffmpeg5
  • ffmpeg6
  • ffmpeg7
  • ffmpeg -> Last installed version

Download Fmpeg: https://www.ffmpeg.org/ffmpeg-master-latest-win64-gpl.zip

FFMPEG ultimate guide: https://img.ly/blog/ultimate-guide-to-ffmpeg/

How to check supported formats and encoders

Ref: https://dev.to/drsensor/list-of-helpful-ffmpeg-command-for-checking-capabilities-1110

How to list all filter options:

$ ffmpeg7 -hide_banner -filters
Filters:
  T.. = Timeline support
  .S. = Slice threading
  ..C = Command support
  A = Audio input/output
  V = Video input/output
  N = Dynamic number and/or type of input/output
  | = Source or sink filter
 T.. adelay           A->A       Delay one or more audio channels.
 ... aecho            A->A       Add echoing to the audio.
...

How to list hardware acceleration:

$ ffmpeg7 -hide_banner -hwaccels
Hardware acceleration methods:
vaapi
qsv
drm
opencl

How to validate ffmpeg OpenCL acceleration (only available on DSM >=7 with more recent Intel processors):

$ ffmpeg7 -hide_banner -filters | grep opencl
 ... avgblur_opencl    V->V       Apply average blur filter
 ... boxblur_opencl    V->V       Apply boxblur filter to input video
 ... colorkey_opencl   V->V       Turns a certain color into transparency. Operates on RGB colors.
 ... convolution_opencl V->V       Apply convolution mask to input video
 ... deshake_opencl    V->V       Feature-point based video stabilization filter
 ... dilation_opencl   V->V       Apply dilation effect
 ... erosion_opencl    V->V       Apply erosion effect
 ... nlmeans_opencl    V->V       Non-local means denoiser through OpenCL
 ... overlay_opencl    VV->V      Overlay one video on top of another
 ... pad_opencl        V->V       Pad the input video.
 ... prewitt_opencl    V->V       Apply prewitt operator
 ... program_opencl    N->V       Filter video using an OpenCL program
 ... remap_opencl      VVV->V     Remap pixels using OpenCL.
 ... roberts_opencl    V->V       Apply roberts operator
 ... scale_opencl      V->V       Scale the input video size through OpenCL.
 ... sobel_opencl      V->V       Apply sobel operator
 ... tonemap_opencl    V->V       Perform HDR to SDR conversion with tonemapping.
 ... transpose_opencl  V->V       Transpose input video
 ... unsharp_opencl    V->V       Apply unsharp mask to input video
 ... xfade_opencl      VV->V      Cross fade one video with another video.
 ... openclsrc         |->V       Generate video using an OpenCL program

On Intel type processor, validate hardware acceleration:

  • Access to the video device file is granted on a per application basis. This allows an application such as tvheadend to be granted access use hardware acceleration when calling ffmpeg.
  • As a default user you must interact with ffmpeg acting as a user who's access was already granted (see example below) or add your user account to the videodriver group.
$ sudo su -s /bin/bash sc-ffmpeg6 -c '/var/packages/synocli-videodriver/target/bin/vainfo'
Trying display: drm
libva info: VA-API version 1.22.0
libva info: Trying to open /var/packages/synocli-videodriver/target/lib/iHD_drv_video.so
libva info: Found init function __vaDriverInit_1_22
libva info: va_openDriver() returns 0
vainfo: VA-API version: 1.22 (libva 2.22.0)
vainfo: Driver version: Intel iHD driver for Intel(R) Gen Graphics - 24.2.5 (a20bb2e)
vainfo: Supported profile and entrypoints
      VAProfileNone                   :	VAEntrypointVideoProc
      VAProfileNone                   :	VAEntrypointStats
      VAProfileMPEG2Simple            :	VAEntrypointVLD
      VAProfileMPEG2Main              :	VAEntrypointVLD
      VAProfileH264Main               :	VAEntrypointVLD
      VAProfileH264Main               :	VAEntrypointEncSlice
      VAProfileH264Main               :	VAEntrypointFEI
      VAProfileH264Main               :	VAEntrypointEncSliceLP
      VAProfileH264High               :	VAEntrypointVLD
      VAProfileH264High               :	VAEntrypointEncSlice
      VAProfileH264High               :	VAEntrypointFEI
      VAProfileH264High               :	VAEntrypointEncSliceLP
      VAProfileVC1Simple              :	VAEntrypointVLD
      VAProfileVC1Main                :	VAEntrypointVLD
      VAProfileVC1Advanced            :	VAEntrypointVLD
      VAProfileJPEGBaseline           :	VAEntrypointVLD
      VAProfileJPEGBaseline           :	VAEntrypointEncPicture
      VAProfileH264ConstrainedBaseline:	VAEntrypointVLD
      VAProfileH264ConstrainedBaseline:	VAEntrypointEncSlice
      VAProfileH264ConstrainedBaseline:	VAEntrypointFEI
      VAProfileH264ConstrainedBaseline:	VAEntrypointEncSliceLP
      VAProfileVP8Version0_3          :	VAEntrypointVLD
      VAProfileVP8Version0_3          :	VAEntrypointEncSlice
      VAProfileHEVCMain               :	VAEntrypointVLD
      VAProfileHEVCMain               :	VAEntrypointEncSlice
      VAProfileHEVCMain               :	VAEntrypointFEI
      VAProfileHEVCMain10             :	VAEntrypointVLD
      VAProfileVP9Profile0            :	VAEntrypointVLD

Note that older Intel processor will fall-back to legacy i965 driver part of vainfo output:

vainfo: VA-API version: 1.22 (libva 2.22.0)
vainfo: Driver version: Intel i965 driver for Intel(R) CherryView - 2.4.1

If access restricted or non-existant such as on virtual DSM:

$ vainfo 
Trying display: drm
error: failed to initialize display

How to validate OpenCL hardware acceleration (truncated output below - only available on DSM >=7 with more recent Intel processors):

$ sudo su -s /bin/bash sc-ffmpeg6 -c '/var/packages/synocli-videodriver/target/bin/clinfo'
Number of platforms                               1
  Platform Name                                   Intel(R) OpenCL Graphics
  Platform Vendor                                 Intel(R) Corporation
  Platform Version                                OpenCL 3.0 
  Platform Profile                                FULL_PROFILE
...

How to list encoders|decoders|codecs

$ ffmpeg7 -hide_banner -encoders
$ ffmpeg7 -hide_banner -decoders
$ ffmpeg7 -hide_banner -codecs

How to list details of a specific encoder|decoder|codec

$ ffmpeg7 -hide_banner -h encoder=<encoder>
$ ffmpeg7 -hide_banner -h decoder=<decoder>

Example for HEVC:

$ ffmpeg7 -hide_banner -h decoder=hevc
Decoder hevc [HEVC (High Efficiency Video Coding)]:
    General capabilities: dr1 delay threads 
    Threading capabilities: frame and slice
    Supported hardware devices: vaapi 
HEVC decoder AVOptions:
  -apply_defdispwin  <boolean>    .D.V....... Apply default display window from VUI (default false)
  -strict-displaywin <boolean>    .D.V....... stricly apply default display window size (default false)

Example for VVC (new with ffmpeg7):

$ ffmpeg7 -hide_banner -h decoder=vvc
Decoder vvc [VVC (Versatile Video Coding)]:
    General capabilities: dr1 delay exp threads 
    Threading capabilities: other

x265 specific

For a specific feature like 10bits support in HEVC:

$ /var/packages/ffmpeg7/target/bin/x265 -V -D10
x265 [info]: HEVC encoder version 3.6+1-aa7f602f7
x265 [info]: build info [Linux][GCC 8.5.0][64 bit] 10bit
x265 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2

Please search for your requirements online, you should find command to run to get your specific answer.

How to use SynoCommunity FFmpeg in Video Station

Warning: untested and can course damage if you don't know what these commands do.

https://gist.github.com/BenjaminPoncet/bbef9edc1d0800528813e75c1669e57e

sudo mv /var/packages/VideoStation/target/bin/ffmpeg /var/packages/VideoStation/target/bin/ffmpeg.old
sudo ln -sf /var/packages/ffmpeg/target/bin/ffmpeg /var/packages/VideoStation/target/bin/ffmpeg
sudo cp -p /var/packages/VideoStation/target/lib/libsynovte.so /var/packages/VideoStation/target/lib/libsynovte.so.old
sudo sed -i 's/eac3/ZXXZ/' /var/packages/VideoStation/target/lib/libsynovte.so
sudo sed -i 's/dts/ZXZ/' /var/packages/VideoStation/target/lib/libsynovte.so
sudo sed -i 's/truehd/ZXZZXZ/' /var/packages/VideoStation/target/lib/libsynovte.so

Reverse the above changes:

sudo mv -f /var/packages/VideoStation/target/bin/ffmpeg.old /var/packages/VideoStation/target/bin/ffmpeg
sudo mv -f /var/packages/VideoStation/target/lib/libsynovte.so.old /var/packages/VideoStation/target/lib/libsynovte.so

(Thanks @GermanChap)

Recent VideoStation version no longer natively loads SynoCommunity ffmpeg libraries. There is a maintained automated patcher based on previous Gist: https://github.com/AlexPresso/VideoStation-FFMPEG-Patcher

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