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• avcodec/h264_slice : compute and export film grain seed

  17 août 2021, par Niklas Haas

  avcodec/h264_slice : compute and export film grain seed
  From SMPTE RDD 5-2006, the grain seed is to be computed from the
  
  following definition of `pic_offset` :
  > When decoding H.264 | MPEG-4 AVC bitstreams, pic_offset is defined as
  
  > follows :
  
  >   - pic_offset = PicOrderCnt(CurrPic) + (PicOrderCnt_offset << 5)
  
  > where :
  
  >   - PicOrderCnt(CurrPic) is the picture order count of the current frame,
  
  >     which shall be derived from [the video stream].
  
  >
  
  >   - PicOrderCnt_offset is set to idr_pic_id on IDR frames. idr_pic_id
  
  >     shall be read from the slice header of [the video stream]. On non-IDR I
  
  >     frames, PicOrderCnt_offset is set to 0. A frame shall be classified as I
  
  >     frame when all its slices are I slices, which may be optionally
  
  >     designated by setting primary_pic_type to 0 in the access delimiter NAL
  
  >     unit. Otherwise, PicOrderCnt_offset it not changed. PicOrderCnt_offset is
  
  >     updated in decoding order.
  Co-authored-by : James Almer <jamrial@gmail.com>
  
  Signed-off-by : Niklas Haas <git@haasn.dev>
  
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/h264_slice.c
  • [DH] libavcodec/h264dec.c
  • [DH] libavcodec/h264dec.h
  • [DH] libavutil/film_grain_params.h

• FFmpeg command works locally but not on Azure Batch Service

  10 août 2018, par Elgert

  I have a command that generates a video with background and text on it with FFmpeg and would like to render it using Azure Batch Service. Locally my command works :

  ./ffmpeg -f lavfi -i color=c=green:s=854x480:d=7 -vf "[in]drawtext=fontsize=46:fontcolor=White:text=dfdhjf dhjf dhjfh djfh djfh:x=(w-text_w)/2:y=((h-text_h)/2)-48,drawtext=fontsize=46:fontcolor=White:text= djfh djfh djfh djfh djf jdhfdjf hjdfh djfh jd fhdj:x=(w-text_w)/2:y=(h-text_h)/2,drawtext=fontsize=46:fontcolor=White:text=fh:x=(w-text_w)/2:y=((h-text_h)/2)+48[out]" -y StoryA.mp4

  while the one generated programatically with C# and added as a task in batch service retursn failure :

  cmd /c %AZ_BATCH_APP_PACKAGE_ffmpeg#3.4%\ffmpeg-3.4-win64-static\bin\ffmpeg -f lavfi -i color=c=green:s=854x480:d=7 -vf "[in]drawtext=fontsize=46:fontcolor=White:text=dfdhjf dhjf dhjfh djfh djfh:x=(w-text_w)/2:y=((h-text_h)/2)-48,drawtext=fontsize=46:fontcolor=White:text= djfh djfh djfh djfh djf jdhfdjf hjdfh djfh jd fhdj:x=(w-text_w)/2:y=(h-text_h)/2,drawtext=fontsize=46:fontcolor=White:text=fh:x=(w-text_w)/2:y=((h-text_h)/2)+48[out]" -y StoryA.mp4

  The ffmpeg configuration works, and also the Pool as I’ve already tested it with simpler ffmpeg commands which had input and output files. This command doesnt have input file, maybe that is part of the problem ?

  Thank you

• Révision 19284 : A prtir du moment ou le procure désigne bien une version donnée du service, on u...

  22 avril 2012, par Eric Lupinacci