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• libavfilter : Add derain filter

  30 mai 2019, par Xuewei Meng

  libavfilter : Add derain filter
  Remove the rain in the input image/video by applying the derain
  
  methods based on convolutional neural networks. Training scripts
  
  as well as scripts for model generation are provided in the
  
  repository at https://github.com/XueweiMeng/derain_filter.git.
  Signed-off-by : Xuewei Meng <xwmeng96@gmail.com>
  

  • [DH] doc/filters.texi
  • [DH] libavfilter/Makefile
  • [DH] libavfilter/allfilters.c
  • [DH] libavfilter/vf_derain.c

• Using Qt Media Player on Raspberry Pi 1

  18 mai 2015, par Mauker

  I have a project built using Qt5 which has to play a video. Just like in the videowidget sample code.

  I’ve followed these instructions to build qt5 on my Pi. And it went just fine. But when I try to run any qt program that uses QMediaPlayer, I get the error message :

  defaultServiceProvider::requestService(): no service found for - "org.qt-project.qt.mediaplayer"

  Which means I don’t have a backend to play the video, right ? Is there any one that I can use which will with Qt, like ffmpeg ? And how can I get it to work ? Specially for h264 videos.

  I’ve tried to install gstreamer as is told on this link, but it’s not working. Will I have to rebuild the entire qt5 again ?

  P.S. : I have the raspberry pi 1 model B with raspbian installed.

  Edit : As mentioned by Greenflow, I checked the ./configure log and saw that the GStreamer was compiled in, but the video apps are still not working...

  The message on the log was like this :

  GStreamer .............. yes (0.10)

  And the message on Greenflow’s log was like this :

  GStreamer .............. yes (1.0)

  Clearly it’s another version of GStreamer, but is it the problem ?

  I’ve also found this post which says QtMultimedia on the Pi is rather useless, but the post is from 2013, so I’m not sure if it’s really relevant. I’d like to have this app playing hardware accelerated videos on my Raspberry Pi, but I’m almost dropping the idea.

  Anyways, thanks Greenflow for the head start.

  Edit 2 : Found this thread on the Qtcentre. Damn, this thing is not going to be easy to solve, I guess...

• libavfilter : vf_drawtext filter support draw text with detection bounding boxes in...

  14 mai 2021, par Ting Fu

  libavfilter : vf_drawtext filter support draw text with detection bounding boxes in side_data
  This feature can be used with dnn detection by setting vf_drawtext's option
  
  text_source=side_data_detection_bboxes, for example :
  
  ./ffmpeg -i face.jpeg -vf dnn_detect=dnn_backend=openvino:model=face-detection-adas-0001.xml :\
  
  input=data:output=detection_out:labels=face-detection-adas-0001.label,drawbox=box_source=
  
  side_data_detection_bboxes,drawtext=text_source=side_data_detection_bboxes:fontcolor=green :\
  
  fontsize=40, -y face_detect.jpeg
  
  Please note, the default fontsize of vf_drawtext is 12, which may be too
  
  small to be seen clearly.
  Signed-off-by : Ting Fu <ting.fu@intel.com>
  

  • [DH] doc/filters.texi
  • [DH] libavfilter/vf_drawtext.c