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• How to reference FfmpegInteropX library in a Unity App zu build UWP HoloLens2 App

  20 avril 2023, par T777

  I tried to recreate your Mediaplayer class on hololens2 to use it to rende frames on an mrtk2 display.
Like done here :
Livestream playback on Hololens2

  


  I could successfully reference SharpDX Lib and use Windows.X classes with #if ENABLE_WINMD_SUPPORT .. #endif. But im still struggling to reference any FfmpeggInteropX classes in my Unity Scripts.

  


  I imported the library with NuGetForUnity Library and expected to use its referenced classes needed by the "livestream playback on hololens script"

  


  But i was getting an error with mismatching target version (only uap10) for the library. I build my uwp app for WindowsTargetPlatform 10.0.19041, unity 2021.10.3f and .net5.0..

  


  Can you please provide more information about a working targetVersion, unity version and buildchain version in this lib ?

  


• ffmpeg Error when evaluating the expression xxx for y when overlay

  23 mars 2023, par LF00

  I use ffmpeg to add a flip watermark on the wideo with overlay,

  


  This works well with x

  


  ffmpeg -hide_banner -i HLS_540.ts -i out.png -filter_complex "[0:v][1:v]overlay=x='-w+400+100*mod(t\,(W+w-400)/100)':y=250" out.mp4

  


  But when I set y with expression if(eq(mod(t,5),0),rand(0,100),y) it show's error.

  


  ffmpeg -hide_banner -i HLS_540.ts -i out.png -filter_complex "[0:v][1:v]overlay=x='-w+400+100*mod(t\,(W+w-400)/100)':y='if(eq(mod(t\,5)\,0)\,rand(0\,100)\,y)'" out.mp4

  


  [Parsed_overlay_0 @ 000002438ba6d880] [Eval @ 000000cf5a3fe2e0] Unknown function in 'rand(0,100),y)'
[Parsed_overlay_0 @ 000002438ba6d880] Error when evaluating the expression 'if(eq(mod(t,5),0),rand(0,100),y)' for y
[Parsed_overlay_0 @ 000002438ba6d880] Failed to configure input pad on Parsed_overlay_0


  


  While when I do like this ffplay -f lavfi -i "color=color=yellow" -vf "drawtext=text='s':x=if(eq(mod(t\,5)\,0)\,rand(0\,(W-tw))\,x+0.03*mod(t\,5)):y=if(eq(mod(t\,5)\,0)\,rand(0\,(H-th))\,y)" it works well.

  


  How can I set rand y in the failed command ?

  


  Envirionment :
win11, git-bash

  


  ffmpeg -version
ffmpeg version N-104863-g6cf55b9da2-20211213 Copyright (c) 2000-2021 the FFmpeg developers
built with gcc 11.2.0 (crosstool-NG 1.24.0.498_5075e1f)
configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-libxml2 --enable-zlib --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvorbis --enable-opencl --enable-libvmaf --disable-libxcb --disable-xlib --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-libdavs2 --disable-libfdk-aac --enable-ffnvcodec --enable-cuda-llvm --enable-frei0r --enable-libgme --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librist --enable-libtheora --enable-libvpx --enable-libwebp --enable-lv2 --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-librav1e --enable-librubberband --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libsvtav1 --enable-libtwolame --enable-libuavs3d --disable-libdrm --disable-vaapi --enable-libvidstab --enable-vulkan --enable-libshaderc --enable-libplacebo --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libzimg --enable-libzvbi --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-ldexeflags= --extra-libs=-lgomp --extra-version=20211213
libavutil      57. 11.100 / 57. 11.100
libavcodec     59. 14.100 / 59. 14.100
libavformat    59. 10.100 / 59. 10.100
libavdevice    59.  0.101 / 59.  0.101
libavfilter     8. 20.100 /  8. 20.100
libswscale      6.  1.101 /  6.  1.101
libswresample   4.  0.100 /  4.  0.100
libpostproc    56.  0.100 / 56.  0.100


  


• ffmpeg bitrate 10% bigger than requested

  22 avril 2023, par danday74

  I have an ffmpeg script.

  


  I request -b:v:0 1000k but get the output BANDWIDTH=1100000 in my master playlist - I was expecting BANDWIDTH=1000000

  


  As you can see there are no audio streams. Why is the BANDWIDTH 10% bigger on every occasion than the requested bitrate ?

  


  Script :

  


  ffmpeg -i rgb.mp4 -hide_banner # dump video stream info

rm -rf hls

ffmpeg -i rgb.mp4 \
  -v warning -preset ultrafast -g 60 -sc_threshold 0 \
  -map 0:0 -map 0:0 -map 0:0 -map 0:0 \
  -s:v:0 1440x1080 -c:v:0 libx264 -b:v:0 1000k \
  -s:v:1 1440x1080 -c:v:1 libx264 -b:v:1 2000k \
  -s:v:2 1920x1440 -c:v:2 libx264 -b:v:2 3000k \
  -s:v:3 1920x1440 -c:v:3 libx264 -b:v:3 4000k \
  -var_stream_map "v:0 v:1 v:2 v:3" \
  -master_pl_name master.m3u8 -f hls \
  -hls_time 6 -hls_list_size 0 -hls_playlist_type vod \
  -hls_segment_filename "hls/v%v/chunk%d.ts" "hls/v%v/index.m3u8"

cat hls/master.m3u8


  


  Output :

  


  $ sh ./ffmpeg-test-script.sh
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'rgb.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    creation_time   : 2021-08-03T11:45:50.000000Z
    encoder         : Lavf59.4.102
  Duration: 00:00:50.04, start: 0.000000, bitrate: 37415 kb/s
  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc), 1920x1440, 37412 kb/s, 30 fps, 30 tbr, 19200 tbn (default)
    Metadata:
      creation_time   : 2021-08-03T11:45:50.000000Z
      handler_name    : Core Media Video
      vendor_id       : [0][0][0][0]
    Side data:
      displaymatrix: rotation of -180.00 degrees
At least one output file must be specified
[swscaler @ 000001fae15daf00] deprecated pixel format used, make sure you did set range correctly
[swscaler @ 000001faef115ec0] deprecated pixel format used, make sure you did set range correctly
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-STREAM-INF:BANDWIDTH=1100000,RESOLUTION=1440x1080,CODECS="avc1.42c028"
v0/index.m3u8

#EXT-X-STREAM-INF:BANDWIDTH=2200000,RESOLUTION=1440x1080,CODECS="avc1.42c028"
v1/index.m3u8

#EXT-X-STREAM-INF:BANDWIDTH=3300000,RESOLUTION=1920x1440,CODECS="avc1.42c032"
v2/index.m3u8

#EXT-X-STREAM-INF:BANDWIDTH=4400000,RESOLUTION=1920x1440,CODECS="avc1.42c032"
v3/index.m3u8