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• FFmpeg + vaapi for encoding, generating error of No VA display found for device : /dev/dri/renderD128

  5 janvier 2019, par User800222

  I’m trying to use vaapi with ffmpeg for vp9’s hwaccel.

  The prebuilt ffmpeg I installed doesn’t have —enable-vaapi, but does have vp9_vaapi, h264_vaapi, etc encoders.

  I also found someone had the same situation of ffmepg but can run vaapi without problems.

  So I’ve tried either comment line and in code to use vaapi for encoding, but both generate same error code of -22.

  Environment :
  Mac OS
  Compile code on ubuntu 16.04 in a docker container
  FFmpeg version :
  root@6161d6e22c8f :/# ffmpeg -hwaccels
  ffmpeg version 4.0.3-1 16.04.york0 Copyright (c) 2000-2018 the FFmpeg developers
  built with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1 16.04.10) 20160609
  configuration : —prefix=/usr —extra-version=’1 16.04.york0’ —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-opengl —enable-sdl2 —enable-libdc1394 —enable-libdrm —enable-libiec61883 —enable-chromaprint —enable-frei0r —enable-libopencv —enable-libx264 —enable-shared
  libavutil 56. 14.100 / 56. 14.100
  libavcodec 58. 18.100 / 58. 18.100
  libavformat 58. 12.100 / 58. 12.100
  libavdevice 58. 3.100 / 58. 3.100
  libavfilter 7. 16.100 / 7. 16.100
  libavresample 4. 0. 0 / 4. 0. 0
  libswscale 5. 1.100 / 5. 1.100
  libswresample 3. 1.100 / 3. 1.100
  libpostproc 55. 1.100 / 55. 1.100
  Hardware acceleration methods :
  vdpau
  vaapi
  drm
  

  (comment line:)
  
  ffmpeg -init_hw_device vaapi=foo:/dev/dri/renderD128
  
  
  
  &
  
  
  
  (in code:)
  
  err = av_hwdevice_ctx_create(&hw_device_ctx, AV_HWDEVICE_TYPE_VAAPI,
  
                               NULL, NULL, 0);
  
  if (err < 0) 
  
  {
  
      fprintf(stderr, "Failed to create a VAAPI device. Error code: %s\n", av_err2str(err));
  
      goto close;
  
  }

  Error generated :
  [AVHWDeviceContext @ 0x55bb3744bf40] No VA display found for device : /dev/dri/renderD128.
  Device creation failed : -22.
  Failed to set value ’vaapi=foo :/dev/dri/renderD128’ for option ’init_hw_device’ : Invalid argument
  Error parsing global options : Invalid argument
  

• avcodec/pgssubdec : Check for duplicate display segments

  29 janvier 2019, par Michael Niedermayer

  avcodec/pgssubdec : Check for duplicate display segments
  In such a duplication the previous gets overwritten and leaks
  Fixes : memleak
  
  Fixes : 12510/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PGSSUB_fuzzer-5694439226343424
  Found-by : continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/pgssubdec.c

• How to display quick preview of output generated from FFMPEG command ? [android]

  6 février 2019, par akash varlani

  Basically I am developing a video editing app that lets user choose some of their images and create video slide show with music.

  I am using FFMPEG to generate video slide show from images but the problem is I can only show preview of the video after executing FFMPEG command.

  Is googled so many blogs and all and I know there is a possible way available to display preview of the output.

  Check below image from reference app. I am developing something similar to this app. There is an option to replace the image in video. This app displays instant preview once I change the image.

  

  Here is the link of the reference app if anyone wants to check :
  https://play.google.com/store/apps/details?id=com.newbiz.mvmaster

  Clicking an EXPORT button this app lets you generate video output. I can do that as I know FFMPEG and how to generate OUTPUT FILE using FFMPEG but what I don’t know is how to display quick preview of OUTPUT VIDEO before generating actual VIDEO FILE.

  On my UBUNTU device I can view output of FFMPEG command using FFPLAY tool but how to do the same on android device.

  Some useful link :
  http://androidwarzone.blogspot.com/2011/12/ffmpeg4android.html