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  • Save a stream of arrays to video using FFMPEG

    13 décembre 2022, par Gianluca Iacchini

    I made a simple fluid simulation using CUDA, and I'm trying to save it to a video using FFMPEG, however I get the Finishing stream 0:0 without any data written to it warning.

    


    This is how i send the data

    


    unsigned char* data = new unsigned char[SCR_WIDTH * SCR_HEIGHT * 4];
uchar4* pColors = new uchar4[SCR_WIDTH * SCR_HEIGHT];

for (int i = 0; i < N_FRAMES; i ++)
{
    // Computes a simulation step and sets pColors with the correct values.
    on_frame(pColors, timeStepSize);
    for (int j = 0; j < SCR_WIDTH * SCR_HEIGHT * 4; j+=4)
    {
        data[j] = pColors[j].x;
        data[j+1] = pColors[j].y;
        data[j+2] = pColors[j].z;
        data[j+3] = pColors[j].w;
    }
    std::cout.write(reinterpret_cast(data), SCR_WIDTH * SCR_HEIGHT * 4);
}


    


    And then I pass it to FFMPEG using the following command :

    


    ./simulation.o | ffmpeg -y -f rawvideo -pixel_format rgba -video_size 1024x1024 -i - -c:v libx264 -pix_fmt yuv444p -crf 0 video.mp4
`

    


    This works fine if I hard code the values (es. if I set data[j] = 255 I get a red screen as expected) but when I use the pColors variable I get the following message from FFMPEG

    


    Finishing stream 0:0 without any data written to it.

    


    Even though both pColors and data hold the correct values.

    


    Here is the full report from FFMPEG

    


    ffmpeg started on 2022-12-13 at 14:28:34
Report written to "ffmpeg-20221213-142834.log"
Command line:
ffmpeg -y -f rawvideo -report -pixel_format rgba -video_size 128x128 -i - -c:v libx264 -pix_fmt yuv444p -crf 0 video9.mp4
ffmpeg version 3.4.11-0ubuntu0.1 Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
  configuration: --prefix=/usr --extra-version=0ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chrom  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Splitting the commandline.
Reading option '-y' ... matched as option 'y' (overwrite output files) with argument '1'.
Reading option '-f' ... matched as option 'f' (force format) with argument 'rawvideo'.
Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
Reading option '-pixel_format' ... matched as AVOption 'pixel_format' with argument 'rgba'.
Reading option '-video_size' ... matched as AVOption 'video_size' with argument '128x128'.
Reading option '-i' ... matched as input url with argument '-'.
Reading option '-c:v' ... matched as option 'c' (codec name) with argument 'libx264'.
Reading option '-pix_fmt' ... matched as option 'pix_fmt' (set pixel format) with argument 'yuv444p'.
Reading option '-crf' ... matched as AVOption 'crf' with argument '0'.
Reading option 'video9.mp4' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option y (overwrite output files) with argument 1.
Applying option report (generate a report) with argument 1.
Successfully parsed a group of options.
Parsing a group of options: input url -.
Applying option f (force format) with argument rawvideo.
Successfully parsed a group of options.
Opening an input file: -.
[rawvideo @ 0x558eba7b0000] Opening 'pipe:' for reading
[pipe @ 0x558eba78a080] Setting default whitelist 'crypto'
[rawvideo @ 0x558eba7b0000] Before avformat_find_stream_info() pos: 0 bytes read:0 seeks:0 nb_streams:1
[rawvideo @ 0x558eba7b0000] After avformat_find_stream_info() pos: 0 bytes read:0 seeks:0 frames:0
Input #0, rawvideo, from 'pipe:':
  Duration: N/A, bitrate: 13107 kb/s
    Stream #0:0, 0, 1/25: Video: rawvideo (RGBA / 0x41424752), rgba, 128x128, 13107 kb/s, 25 tbr, 25 tbn, 25 tbc
Successfully opened the file.
Parsing a group of options: output url video9.mp4.
Applying option c:v (codec name) with argument libx264.
Applying option pix_fmt (set pixel format) with argument yuv444p.
Successfully parsed a group of options.
Opening an output file: video9.mp4.
[file @ 0x558eba78a200] Setting default whitelist 'file,crypto'
Successfully opened the file.
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
cur_dts is invalid (this is harmless if it occurs once at the start per stream)
No more output streams to write to, finishing.
Finishing stream 0:0 without any data written to it.
detected 2 logical cores
[graph 0 input from stream 0:0 @ 0x558eba7a4a00] Setting 'video_size' to value '128x128'
[graph 0 input from stream 0:0 @ 0x558eba7a4a00] Setting 'pix_fmt' to value '28'
[graph 0 input from stream 0:0 @ 0x558eba7a4a00] Setting 'time_base' to value '1/25'
[graph 0 input from stream 0:0 @ 0x558eba7a4a00] Setting 'pixel_aspect' to value '0/1'
[graph 0 input from stream 0:0 @ 0x558eba7a4a00] Setting 'sws_param' to value 'flags=2'
[graph 0 input from stream 0:0 @ 0x558eba7a4a00] Setting 'frame_rate' to value '25/1'
[graph 0 input from stream 0:0 @ 0x558eba7a4a00] w:128 h:128 pixfmt:rgba tb:1/25 fr:25/1 sar:0/1 sws_param:flags=2
[format @ 0x558eba7a4b40] compat: called with args=[yuv444p]
[format @ 0x558eba7a4b40] Setting 'pix_fmts' to value 'yuv444p'
[auto_scaler_0 @ 0x558eba7a4be0] Setting 'flags' to value 'bicubic'
[auto_scaler_0 @ 0x558eba7a4be0] w:iw h:ih flags:'bicubic' interl:0
[format @ 0x558eba7a4b40] auto-inserting filter 'auto_scaler_0' between the filter 'Parsed_null_0' and the filter 'format'
[AVFilterGraph @ 0x558eba76d500] query_formats: 4 queried, 2 merged, 1 already done, 0 delayed
[auto_scaler_0 @ 0x558eba7a4be0] w:128 h:128 fmt:rgba sar:0/1 -> w:128 h:128 fmt:yuv444p sar:0/1 flags:0x4
[libx264 @ 0x558eba7cf900] using mv_range_thread = 24
[libx264 @ 0x558eba7cf900] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 AVX512
[libx264 @ 0x558eba7cf900] profile High 4:4:4 Predictive, level 1.1, 4:4:4 8-bit
[libx264 @ 0x558eba7cf900] 264 - core 152 r2854 e9a5903 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x1:0x111 me=hex subme=7 psy=0 mixed_ref=1 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=0 chroma_qp_offset=0 threads=3 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc=cqp mbtree=0 qp=0
Output #0, mp4, to 'video9.mp4':
  Metadata:
    encoder         : Lavf57.83.100
    Stream #0:0, 0, 1/12800: Video: h264 (libx264) (avc1 / 0x31637661), yuv444p, 128x128, q=-1--1, 25 fps, 12800 tbn, 25 tbc
    Metadata:
      encoder         : Lavc57.107.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
frame=    0 fps=0.0 q=0.0 Lsize=       0kB time=00:00:00.00 bitrate=N/A speed=   0x    
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Input file #0 (pipe:):
  Input stream #0:0 (video): 0 packets read (0 bytes); 0 frames decoded; 
  Total: 0 packets (0 bytes) demuxed
Output file #0 (video9.mp4):
  Output stream #0:0 (video): 0 frames encoded; 0 packets muxed (0 bytes); 
  Total: 0 packets (0 bytes) muxed
0 frames successfully decoded, 0 decoding errors
[AVIOContext @ 0x558eba7b4120] Statistics: 2 seeks, 3 writeouts
[AVIOContext @ 0x558eba7b4000] Statistics: 0 bytes read, 0 seeks



    


    I've never used FFMPEG before so I'm having a hard time finding my mistake.

    


  • ffmpeg : ffplay reading audio live stream from azure media services but no sound

    30 novembre 2022, par SOAL ABDELDJALLIL

    I also would say that playing audio file with the same command works fine, but with live streams it's kind of random.

    


    this is the output :

    


    ffplay "https://xxxxxx.streaming.media.azure.net/d7b0faf2-9922-4ee6-a9fb-4a1cc33d1dab/output.ism/manifest(format=mpd-time-cmaf)" -nodisp

ffplay version 4.1.9-0+deb10u1+rpt1 Copyright (c) 2003-2022 the FFmpeg developers
  built with gcc 8 (Raspbian 8.3.0-6+rpi1)
  configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --enable-gpl -                                                  -disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable                                                  -libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig -                                                  -enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-li                                                  bopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnap                                                  py --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enabl                                                  e-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-                                                  lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enable-vout-drm                                                   --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enabl                                                  e-libx264 --enable-shared --libdir=/usr/lib/arm-linux-gnueabihf --cpu=arm1176jzf-s --arch=arm
  WARNING: library configuration mismatch
  avutil      configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --                                                  enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-lib                                                  aom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-lib                                                  fontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa                                                   --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --en                                                  able-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo                                                  rbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzv                                                  bi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enab                                                  le-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-fr                                                  ei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disab                                                  le-doc --disable-programs
  avcodec     configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --                                                  enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-lib                                                  aom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-lib                                                  fontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa                                                   --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --en                                                  able-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo                                                  rbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzv                                                  bi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enab                                                  le-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-fr                                                  ei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disab                                                  le-doc --disable-programs
  avformat    configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --                                                  enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-lib                                                  aom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-lib                                                  fontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa                                                   --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --en                                                  able-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo                                                  rbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzv                                                  bi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enab                                                  le-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-fr                                                  ei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disab                                                  le-doc --disable-programs
  avdevice    configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --                                                  enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-lib                                                  aom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-lib                                                  fontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa                                                   --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --en                                                  able-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo                                                  rbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzv                                                  bi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enab                                                  le-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-fr                                                  ei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disab                                                  le-doc --disable-programs
  avfilter    configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --                                                  enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-lib                                                  aom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-lib                                                  fontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa                                                   --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --en                                                  able-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo                                                  rbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzv                                                  bi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enab                                                  le-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-fr                                                  ei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disab                                                  le-doc --disable-programs
  avresample  configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --                                                  enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-lib                                                  aom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-lib                                                  fontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa                                                   --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --en                                                  able-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo                                                  rbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzv                                                  bi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enab                                                  le-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-fr                                                  ei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disab                                                  le-doc --disable-programs
  swscale     configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --                                                  enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-lib                                                  aom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-lib                                                  fontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa                                                   --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --en                                                  able-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo                                                  rbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzv                                                  bi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enab                                                  le-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-fr                                                  ei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disab                                                  le-doc --disable-programs
  swresample  configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --                                                  enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-lib                                                  aom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-lib                                                  fontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa                                                   --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --en                                                  able-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo                                                  rbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzv                                                  bi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enab                                                  le-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-fr                                                  ei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disab                                                  le-doc --disable-programs
  postproc    configuration: --prefix=/usr --extra-version=0+deb10u1+rpt1 --toolchain=hardened --incdir=/usr/include/arm-linux-gnueabihf --                                                  enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-lib                                                  aom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-lib                                                  fontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa                                                   --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --en                                                  able-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo                                                  rbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzv                                                  bi --enable-lv2 --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-omx-rpi --enable-mmal --enable-neon --enable-rpi --enab                                                  le-vout-drm --enable-v4l2-request --enable-libudev --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-fr                                                  ei0r --enable-libx264 --libdir=/usr/lib/arm-linux-gnueabihf/neon/vfp --cpu=cortex-a7 --arch=armv6t2 --disable-thumb --enable-shared --disab                                                  le-doc --disable-programs
  libavutil      56. 22.100 / 56. 22.100
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  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  3.100 /  5.  3.100
  libswresample   3.  3.100 /  3.  3.100
  libpostproc    55.  3.100 / 55.  3.100
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  • FFMPEG blending screen two libvpx-vp9 webm yuva420p video files comes out looking incorrect

    30 novembre 2022, par OneWorld

    I'm trying to screen blend two libvpx-vp9 webm files, so that the blend comes out looking correct in FFMPEG. The example below takes two rgba png input files, loops them for a couple of seconds into libvpx-vp9 webm files with the pixel format yuva420p. It then tries to blend them using FFMPEG. I then output frames of these to visualise how it looks here in this Stack Overflow post.

    


    I have these two input rgba pngs (circle and Pikachu)

    


    enter image description here
enter image description here

    


    I create two libvpx-vp9 webm files from them like this :-

    


    ffmpeg -loop 1 -i circle_50_rgba.png -c:v libvpx-vp9 -t 2 -pix_fmt yuva420p circle_libvpx-vp9_yuva420p.webm

ffmpeg -loop 1 -i pikachu_rgba.png -c:v libvpx-vp9 -t 2 -pix_fmt yuva420p pikachu_libvpx-vp9_yuva420p.webm


    


    I then try and do a blend of these two libvpx-vp9 webm files like this :-

    


    ffmpeg -y -c:v libvpx-vp9 -i circle_libvpx-vp9_yuva420p.webm -c:v libvpx-vp9 -i pikachu_libvpx-vp9_yuva420p.webm -filter_complex "[1:v][0:v]blend=all_mode=screen" pikachu_reverse_all_mode_screened_onto_circle_both_yuva420p.webm


    


    and extract a frame from that like this

    


    ffmpeg  -c:v libvpx-vp9 -i pikachu_reverse_all_mode_screened_onto_circle_both_yuva420p.webm -frames:v 1  pikachu_reverse_all_mode_screened_onto_circle_from_yuva420p.png


    


    Which looks like this :-
enter image description here

    


    If I do this without all_mode, like this

    


    ffmpeg -y -c:v libvpx-vp9 -i circle_libvpx-vp9_yuva420p.webm -c:v libvpx-vp9 -i pikachu_libvpx-vp9_yuva420p.webm -filter_complex "[1:v][0:v]blend=screen" pikachu_reverse_screened_onto_circle_both_yuva420p.webm


    


    and then extract the png so we can visualise it, like this :-

    


    ffmpeg  -c:v libvpx-vp9 -i pikachu_reverse_screened_onto_circle_both_yuva420p.webm -frames:v 1  pikachu_reverse_screened_onto_circle_from_yuva420p.png


    


    it gives this output :-
enter image description here

    


    which is also incorrect because the white part of the circle should be completely white in the screen blend. We shouldn't see a faint yellow outline of Pikachu inside the white part.

    


    It should look like this :-
enter image description here

    


    Here is the full log of this is like this :-

    


    ffmpeg -y -c:v libvpx-vp9 -i circle_libvpx-vp9_yuva420p.webm -c:v libvpx-vp9 -i pikachu_libvpx-vp9_yuva420p.webm -filter_complex "[1:v][0:v]blend=screen" pikachu_reverse_screened_onto_circle_both_yuva420p.webm
ffmpeg version 4.2.7-0ubuntu0.1 Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)
  configuration: --prefix=/usr --extra-version=0ubuntu0.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
[libvpx-vp9 @ 0x55d5b1f34680] v1.8.2
    Last message repeated 1 times
Input #0, matroska,webm, from 'circle_libvpx-vp9_yuva420p.webm':
  Metadata:
    ENCODER         : Lavf58.29.100
  Duration: 00:00:02.00, start: 0.000000, bitrate: 19 kb/s
    Stream #0:0: Video: vp9 (Profile 0), yuva420p(tv), 50x50, SAR 1:1 DAR 1:1, 25 fps, 25 tbr, 1k tbn, 1k tbc (default)
    Metadata:
      alpha_mode      : 1
      ENCODER         : Lavc58.54.100 libvpx-vp9
      DURATION        : 00:00:02.000000000
[libvpx-vp9 @ 0x55d5b1f854c0] v1.8.2
    Last message repeated 1 times
Input #1, matroska,webm, from 'pikachu_libvpx-vp9_yuva420p.webm':
  Metadata:
    ENCODER         : Lavf58.29.100
  Duration: 00:00:02.00, start: 0.000000, bitrate: 29 kb/s
    Stream #1:0: Video: vp9 (Profile 0), yuva420p(tv), 50x50, SAR 1:1 DAR 1:1, 25 fps, 25 tbr, 1k tbn, 1k tbc (default)
    Metadata:
      alpha_mode      : 1
      ENCODER         : Lavc58.54.100 libvpx-vp9
      DURATION        : 00:00:02.000000000
[libvpx-vp9 @ 0x55d5b1f38940] v1.8.2
[libvpx-vp9 @ 0x55d5b1f49440] v1.8.2
Stream mapping:
  Stream #0:0 (libvpx-vp9) -> blend:bottom
  Stream #1:0 (libvpx-vp9) -> blend:top
  blend -> Stream #0:0 (libvpx-vp9)
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[libvpx-vp9 @ 0x55d5b1f49440] v1.8.2
[libvpx-vp9 @ 0x55d5b1f38940] v1.8.2
[libvpx-vp9 @ 0x55d5b1f80c40] v1.8.2
Output #0, webm, to 'pikachu_reverse_screened_onto_circle_both_yuva420p.webm':
  Metadata:
    encoder         : Lavf58.29.100
    Stream #0:0: Video: vp9 (libvpx-vp9), yuva420p, 50x50 [SAR 1:1 DAR 1:1], q=-1--1, 200 kb/s, 25 fps, 1k tbn, 25 tbc (default)
    Metadata:
      encoder         : Lavc58.54.100 libvpx-vp9
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
frame=   50 fps=0.0 q=0.0 Lsize=       7kB time=00:00:01.96 bitrate=  29.3kbits/s speed=33.2x    
video:4kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 96.711426%



    


    I also tried doing a convertion to rgba, like this :-

    


    ffmpeg -y -c:v libvpx-vp9 -i circle_libvpx-vp9_yuva420p.webm -c:v libvpx-vp9 -i pikachu_libvpx-vp9_yuva420p.webm -filter_complex "[0:v]format=pix_fmts=rgba[zero];[1:v]format=pix_fmts=rgba[one];[one][zero]blend=screen" pikachu_reverse_screened_all_mode_onto_circle_after_rgba_conversion_webm.webm


    


    However the result of this also comes out with yellow inside the white circle, which should be white

    


    I was wondering what I need to do so that the blend of these two webm libvpx-vp9 video files looks correct, like it does above.

    


    note : I need to retain the alpha channels, because sometimes assets have transparent alpha channels. In the examples above the assets happen to have opaque alpha channels.

    


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