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• avcodec/hevcdec : fix stat_coeff save/load for persistent_rice_adaptation_enabled_flag

  15 novembre 2020, par Xu Guangxin

  avcodec/hevcdec : fix stat_coeff save/load for persistent_rice_adaptation_enabled_flag
  It's required by the 9.3.1 TableStatCoeff* section.
  Following clips have this feature :
  
  WPP_HIGH_TP_444_8BIT_RExt_Apple_2.bit
  
  Bitdepth_A_RExt_Sony_1.bin
  
  Bitdepth_B_RExt_Sony_1.bin
  
  EXTPREC_HIGHTHROUGHPUT_444_16_INTRA_10BIT_RExt_Sony_1.bit
  
  EXTPREC_HIGHTHROUGHPUT_444_16_INTRA_12BIT_RExt_Sony_1.bit
  
  EXTPREC_HIGHTHROUGHPUT_444_16_INTRA_8BIT_RExt_Sony_1.bit
  
  EXTPREC_MAIN_444_16_INTRA_10BIT_RExt_Sony_1.bit
  
  EXTPREC_MAIN_444_16_INTRA_12BIT_RExt_Sony_1.bit
  
  EXTPREC_MAIN_444_16_INTRA_8BIT_RExt_Sony_1.bit
  
  WPP_AND_TILE_10Bit422Test_HIGH_TP_444_10BIT_RExt_Apple_2.bit
  
  WPP_AND_TILE_AND_CABAC_BYPASS_ALIGN_0_HIGH_TP_444_14BIT_RExt_Apple_2.bit
  
  WPP_AND_TILE_AND_CABAC_BYPASS_ALIGN_1_HIGH_TP_444_14BIT_RExt_Apple_2.bit
  
  WPP_AND_TILE_HIGH_TP_444_8BIT_RExt_Apple_2.bit
  you can download them from :
  
  https://www.itu.int/wftp3/av-arch/jctvc-site/bitstream_exchange/draft_conformance/RExt/
  Signed-off-by : Xu Guangxin <oddstone@gmail.com>
  
  Signed-off-by : Linjie Fu <linjie.justin.fu@gmail.com>
  

  • [DH] libavcodec/hevc_cabac.c
  • [DH] libavcodec/hevcdec.c
  • [DH] libavcodec/hevcdec.h

• I am trying to save frames from a webcam via Python and ffmpeg, but the video becomes way to fast

  10 mai 2022, par Matthias

  I get a stream of cv2 images from my webcam and want to save it to a video file. After playing a bit with cv2.VideoWriter() it turned out that using ffmpeg would provide more options and - apparently, following a few threads here on SO - lead to better results. So I gave the VidGear Python library a try, and it seems to work fine.

  


  There is one catch though : My webcam provides a variable framerate, most of the time between 10 and 30 FPS. When saving these frames the video file becomes way too fast, like watching in fast-forward. One real-time minute becomes only a few seconds in the video.

  


  I tried to play with various combinations of the ffmpeg's -framerate and/or -r parameters, but without luck. Here is the command I am using right now :

  


  ffmpeg -y -f rawvideo -vcodec rawvideo -s 1920x1080 -pix_fmt bgra -framerate 25.0 -i - -vcodec libx265 -crf 25 -r 25 -preset fast 


  


  For the records, I am creating the WriteGear class from the VidGear library like this :

  


  video_params = {
    "-vcodec": "libx265",
    "-crf": 25,
    "-input_framerate": 25,
    "-r": 25,
}
WriteGear(output_filename=video_file, logging=True, **video_params)


  


  Any ideas what I am doing wrong here and how I need to call ffmpeg ?

  


• FFMPEG : How to save the effects (blur, adding image , ...) on the input video instead of creating a one ?

  9 juillet 2016, par Drupalist

  I need to save the effects on the current video instead of creating a one. For example this code

  ffmpeg -i input.mp4 -i logo.png -filter_complex "[1:v][0:v]scale2ref=(505/384)*ih/8:ih/8[wm][base];[wm]setsar=1[wmsar];[base][wmsar]overlay=10:10" -pix_fmt yuv420p -c:a copy output.mp4

  pastes an image on a video, but I need the image to be pasted to input.mp4 not output.mp4.

  I tried

  ffmpeg -i input.mp4 -i logo.png -filter_complex "[1:v][0:v]scale2ref=(505/384)*ih/8:ih/8[wm][base];[wm]setsar=1[wmsar];[base][wmsar]overlay=10:10" -pix_fmt yuv420p -c:a

  but it didn’t work.

  Thanks in advance.