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• How to add custom external video filter to ffmpeg at runtime ?

  9 décembre 2019, par alex

  Trying to build ffplay app that uses ffmpeg LGPL build with custom filter that I want to plug in during runtime. Differently from adding custom filter during compilation described scenario is not documented, thus tried to experiment. Tried executing avfilter_register and avfilter_graph_alloc_filter functions before avfilter_graph_parse_ptr with avfilter_graph_parse_ptr resulting in -22 return value (Invalid argument).

  Filter graph string : [in] split [T1], fifo, [T2] overlay=0:H/2 [out]; [T1] fifo, crop=iw:ih/2:0:ih/2, my_edgedetect=low=0.1:high=0.4 [T2]

  Lines added to configure_filtergraph function in ffplay.c :

          if ((ret = avfilter_register(&ff_vf_edgedetect)) < 0)
  
              goto fail;
  
          if ((ret = avfilter_graph_alloc_filter(graph, &ff_vf_edgedetect, ff_vf_edgedetect.name)) < 0)
  
              goto fail;

  Custom edge detect filter name (AVFilter.name) changed to my_edgedetect.

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  What is the proper way to register custom filter during runtime ?

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  P.S.
  Same question on Zeranoa forum

• How to create video and audio files for the Media Source Extension API ?

  5 décembre 2018, par Aman

  I have created a video player from the Media Source Extension API. I have split the video and audio from the original.mp4 (1 minute duration). I have split the video and audio into small 5 second files (12 files in total). I’m getting each one of them and playing them together. But the video stops playing at around 45-47 seconds. I cannot understand to why the video is stopping/buffering. I cannot understand whether the problem is in the javascript code or the video files ?

  I have uploaded all the resources here (https://drive.google.com/file/d/1NHc_yNRU0tvaU18aohLy74Js3y7UHD4N/view?usp=sharing). And written the commands I used to construct my video and audio files below. I have also noticed that this problem only occurs with Google Chrome and works perfectly and smoothly on Microsoft Edge. Thanks

  Making the Media files:

  Extracting video from original.mp4: MP4Box -single 1 original.mp4

  Extracting audio from original.mp4: MP4Box -single 2 original.mp4

  Splitting the video and audio into 5 second parts: ffmpeg -ss starting-time -to end-time -i (video.mp4 OR audio.mp4) (video_part.mp4 OR audio_part.mp4)

  Fragmenting all the video and audio parts: MP4Box -dash 1000 -rap -frag-rap(video_part.mp4 OR audio_part.mp4)

  Then using the fragmented video and audio files to be played via the Media Source Extension API video player. e.g. (video_part_dashinit.mp4 OR audio_part_dashinit.mp4)

• Put remaining pieces of CODEC_FLAG_EMU_EDGE under FF_API_EMU_EDGE.

  17 août 2015, par Ronald S. Bultje

  Put remaining pieces of CODEC_FLAG_EMU_EDGE under FF_API_EMU_EDGE.
  The amv one probably looks suspicious, but since it’s an intra-only
  
  codec, I couldn’t possibly imagine what it would use the edge for,
  
  and the vsynth fate result doesn’t change, so it’s probably OK.
  

  • [DH] ffmpeg_opt.c
  • [DH] ffplay.c
  • [DH] libavcodec/mjpegenc.c
  • [DH] libavcodec/snowenc.c
  • [DH] libavcodec/wmv2dec.c