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• avformat/mov : add option max_stts_delta

  27 novembre 2021, par Gyan Doshi

  avformat/mov : add option max_stts_delta
  Very high stts sample deltas may occasionally be intended but usually
  
  they are written in error or used to store a negative value for dts correction
  
  when treated as signed 32-bit integers.
  This option lets the user set an upper limit, beyond which the delta is clamped to 1.
  
  Values greater than the limit if negative when cast to int32 are used to adjust onward dts.
  Unit is the track time scale. Default is UINT_MAX - 48000*10 which
  
  allows upto a 10 second dts correction for 48 kHz audio streams while
  
  accommodating 99.9% of uint32 range.
  Signed-off-by : Gyan Doshi <ffmpeg@gyani.pro>
  
  Reviewed-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] doc/demuxers.texi
  • [DH] libavformat/isom.h
  • [DH] libavformat/mov.c

• lavf/movenc : enable dvh1 FourCC

  5 février 2023, par Damiano Galassi

  lavf/movenc : enable dvh1 FourCC
  This is required to pass through Dolby Vision metadata to x265.
  
  Profiles 5 and 8 require the "dvh1" fourCC :
  
  https://professional.dolby.com/siteassets/content-creation/dolby-vision-for-content-creators/dolby-vision-streams-within-the-http-live-streaming-format-v2.0-13-november-2018.pdf#unique_10
  
  https://professional.dolby.com/siteassets/content-creation/dolby-vision-for-content-creators/dolbyvisioninmpegdashspecification_v2_0_public_20190107.pdf#unique_13
  
  https://professional.dolby.com/siteassets/content-creation/dolby-vision-for-content-creators/dolby_vision_bitstreams_within_the_iso_base_media_file_format_dec2017.pdf
  See also https://github.com/HandBrake/HandBrake/pull/4838 for more
  
  details.
  Fixes : https://trac.ffmpeg.org/ticket/10257
  

  • [DH] libavformat/movenc.c

• How to optimize FFMPEG/ Chromacast video ?

  5 août 2021, par Hasan

  Re-broadcast a live broadcast by chromecasting it. The code below delays 5 seconds.

  


  Server I use :
https://instances.vantage.sh/?selected=c5.2xlarge

  


  Can you help me optimize the code ?

  


  chromakey.sh

  


  
# Combine two files using a chromakey effects
filter_complex(){
  local videoWith="${1:-1920}"  # Video Size
  local videoHeight="${2:-1080}"  # Video Size
  local key="${3:-00FF00}"      # Colorkey colour - default vaue is 0000FF or green
  local colorSim="${4:-0.2}"    # Colorkey similarity level - default value is 0.2
  local colorBlend="${5:-0.1}"  # Colorkey blending level - default value is 0.1

  # Update color variable according to user input
  # This makes the matching case insensitive
  if [[ $3 =~ ^[0-9A-F]{6}$ ]]; then
    key=$3
  elif [[ $(tr "[:upper:]" "[:lower:]" <<<"$1")  = "blue" ]]; then
    key="0000FF"
  elif [[ $(tr "[:upper:]" "[:lower:]" <<<"$1")  = "green" ]]; then
    key="00FF00"
  elif [[ $(tr "[:upper:]" "[:lower:]" <<<"$1")  = "red" ]]; then
    key="FF0000"
  elif [[ $(tr "[:upper:]" "[:lower:]" <<<"$1")  = "purple" ]]; then
    key="0000FF"
  elif [[ $(tr "[:upper:]" "[:lower:]" <<<"$1")  = "orange" ]]; then
    key="ff9900"
  elif [[ $(tr "[:upper:]" "[:lower:]" <<<"$1")  = "yellow" ]]; then
    key="FFFF00"
  fi

  
  filterString="[1:v]scale=$videoWith x $videoHeight,chromakey=0 x $key:$colorSim:$colorBlend[ckout];[0:v]scale=(iw*sar)*max($videoWith/(iw*sar)\,$videoHeight/ih):ih*max($videoWith/(iw*sar)\,$videoHeight/ih), crop=$videoWith:$videoHeight[bg];[bg][ckout]overlay[out]"
  
  printf '%s%s%s%s%s' $filterString
}

ffmpeg -re -stream_loop -1 -i "${1}" -i "${2}" -preset ultrafast -filter_complex "$(filter_complex "${@:4}")" -map '[out]' -c:v libx264 -f flv "${3}"


  


  Usage : ./chromakey.sh mask.mp4 http://example.com/live/broadcast_orj rtmp ://example.com/live/broadcast_greenscreen 1920 1080 green 0.1 0.2