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• Failed setup for format dxva2_vld : hwaccel initialisation returned error

  13 juin 2023, par james

  My program is a video player based on ffmpeg implementation, enabling d3d11va and dxva2 hardware acceleration to decode video frames, play most of the video is normal, only a small part of the video will report this error, ffmpeg printed log as follows :
I:2023-06-13 15:34:53 ms:887:No decoder device for codec found
I:2023-06-13 15:34:53 ms:887:Failed setup for format dxva2_vld : hwaccel initialisation returned error.
I:2023-06-13 15:34:53 ms:888:Format dxva2_vld not usable, retrying get_format() without it.
I:2023-06-13 15:34:53 ms:888:decode_slice_header error
I:2023-06-13 15:34:53 ms:888:no frame !

  


  If ffplay is used and d3d11va and dxva2 hardware acceleration is not enabled, the video can be played normally, and the printed video information is as follows :
PS D :\msys64\home\wangj\ffmpeg-4.4.1\buildout\bin> .\ffplay.exe -i D :\Desktop\13132023061300012_1_C1_34.mp4
ffplay version 4.4.1 Copyright (c) 2003-2021 the FFmpeg developers
configuration : —prefix=./buildout —arch=x86 —toolchain=msvc —enable-shared —disable-debug —enable-sdl2 —enable-dxva2 —enable-d3d11va
libavutil 56. 70.100 / 56. 70.100
libavcodec 58.134.100 / 58.134.100
libavformat 58. 76.100 / 58. 76.100
libavdevice 58. 13.100 / 58. 13.100
libavfilter 7.110.100 / 7.110.100
libswscale 5. 9.100 / 5. 9.100
libswresample 3. 9.100 / 3. 9.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'D :\Desktop\13132023061300012_1_C1_34.mp4' :
Metadata :
major_brand : isom
minor_version : 512
compatible_brands : isomiso2avc1mp41
encoder : Lavf56.38.102
Duration : 00:00:44.00, start : 0.000000, bitrate : 1706 kb/s
Stream #0:0(und) : Video : h264 (Baseline) (avc1 / 0x31637661), yuv420p, 1920x1080, 1705 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc (default)
Metadata :
handler_name : VideoHandler
vendor_id : [0][0][0][0]

  


  Is this pixel format not supported by d3d11va and dxva2 ? What can I do to get ffplay to play this video file with hardware acceleration ?

  


  When d3d11va and dxva2 hardware acceleration is enabled, most of the videos that can be played also have yuv420p pixel format, why can't this video be played？

  


• How can I concat several videos generated by MediaRecorder slices

  28 mai 2023, par Bruno Francisco

  I have the following frontend code :

  


  const mediaRecorder = new MediaRecorder(stream, {
        mimeType: 'video/webm'
    });

    mediaRecorder.start(10000);

    mediaRecorder.ondataavailable = (e) => {
        const formData = new FormData();

        formData.append('video', new Blob([e.data], { 'type' : 'video/webm;' }));

        fetch('http://localhost/api/session/12/video/stream', {
            method: 'POST',
            body: formData,
        }).then(() => {
            console.log('success')
        }).catch((e) => {
            console.log('error')
            console.log(e);
        });
    };


  


  Then, in the backend I'm saving the each 10 seconds video into a folder. Then, whenever the user finishes his session, we would like to stitch together all the videos together.

  


  If the user has recorded for 20 seconds, we will have 2 videos of 10 seconds.

  


  I have the following files in my folder :

  


  erKa3MVTuDfnuDUQUhUd2huUaCKfihtm8thc0KX0.bin
hAhJfVNxMEJK2MsyR99a7t7UkT3pjHkmdN1j2C9G.mkv


  


  I'm assuming that the first slice generated by MediaRecord includes the mime type, while the subsequent parts do not have mime types, generating a .bin file.

  


  Now, I run the following command to stitch all parts together :

  


  ffmpeg -i erKa3MVTuDfnuDUQUhUd2huUaCKfihtm8thc0KX0.bin -i hAhJfVNxMEJK2MsyR99a7t7UkT3pjHkmdN1j2C9G.mkv -filter_complex "concat=n=2:v=0:a=1" -vn -y final-video.mp4


  


  Then I get the following error :

  


  ffmpeg version 4.4.2-0ubuntu0.22.04.1 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 11 (Ubuntu 11.2.0-19ubuntu1)
  configuration: --prefix=/usr --extra-version=0ubuntu0.22.04.1 --toolchain=hardened --libdir=/usr/lib/aarch64-linux-gnu --incdir=/usr/include/aarch64-linux-gnu --arch=arm64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --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-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-librsvg --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
[h264 @ 0xaaaaf1ad3a70] non-existing PPS 0 referenced
    Last message repeated 1 times

...

Input #0, h264, from 'erKa3MVTuDfnuDUQUhUd2huUaCKfihtm8thc0KX0.bin':
  Duration: N/A, bitrate: N/A
  Stream #0:0: Video: h264 (Baseline), yuv420p(tv, bt709, progressive), 1920x1080, 25 fps, 25 tbr, 1200k tbn, 50 tbc
Input #1, matroska,webm, from 'hAhJfVNxMEJK2MsyR99a7t7UkT3pjHkmdN1j2C9G.mkv':
  Metadata:
    encoder         : Chrome
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #1:0(eng): Video: h264 (Baseline), yuv420p(tv, bt709, progressive), 1920x1080, SAR 1:1 DAR 16:9, 29.33 fps, 29.33 tbr, 1k tbn, 2k tbc (default)
Cannot find a matching stream for unlabeled input pad 0 on filter Parsed_concat_0


  


  Is there any way to stitch all files together ? Do I have to send the mime type on each time ondataavailable is called ?

  


• FFMPEG Error : Padded dimensions smaller then input dimensions

  17 mai 2023, par Hekimen

  I have this ffmpeg command

  


  ffmpeg -i input.mp4 \
-vf "scale=80:45:force_original_aspect_ratio=decrease,pad=80:45:(ow-iw)/2:(oh-ih)/2:color=black,setsar=1,fps=1/5" \
-q:v 2 \
output/screenshot_%05d.jpg


  


  but it returns error :

  


  [Parsed_pad_1 @ 0x7f2014097f00] Padded dimensions cannot be smaller than input dimensions.
[Parsed_pad_1 @ 0x7f2014097f00] Failed to configure input pad on Parsed_pad_1
Error reinitializing filters!
Failed to inject frame into filter network: Invalid argument
Error while processing the decoded data for stream #0:0
Conversion failed!


  


  I tried command without pad filter and checked all screenshots, they are all generated with resolution 60x45. When i use same command but change scale and pad to 160x90 resolution it works without any error.

  


  I also checked ffmpeg manual for pad filter but i can't find anything helpful what should explain this error (https://ffmpeg.org/ffmpeg-filters.html#pad-1)

  


  How to make this command work ?

  


  I am using this ffmpeg version :

  


  ffmpeg version 4.4.1 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.3.1 (Alpine 10.3.1_git20211027) 20211027
  configuration: --prefix=/usr --enable-avresample --enable-avfilter --enable-gnutls --enable-gpl --enable-libass --enable-libmp3lame --enable-libvorbis --enable-libvpx --enable-libxvid --enable-libx264 --enable-libx265 --enable-libtheora --enable-libv4l2 --enable-libdav1d --enable-postproc --enable-pic --enable-pthreads --enable-shared --enable-libxcb --enable-libsrt --enable-libssh --enable-libvidstab --disable-stripping --disable-static --disable-librtmp --enable-libaom --enable-libopus --enable-libsoxr --enable-libwebp --enable-vaapi --enable-vdpau --enable-vulkan --disable-debug
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100