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• How to set fractional values for `seg_duration` when using ffmpeg's dash muxer ?

  29 décembre 2019, par agconti

  I’m trying to set a fractional value for seg_duration when using ffmepg’s dash muxer like the docs suggest. When I switch between integer decimal values, I don’t get different results. How can I set a fractional value for seg_duration ?

  • E.g. Running my command with seg_duration equal to 1 produces the same minBufferTime as using 0.01.
  • In the source, seg_duration is represented as an int64_t so I don’t see how you can pass a fraction to it.

  Here’s an example ffmpeg command to reproduce :

  ffmpeg -loglevel verbose \
  
  -i $INGESTION_PATH \
  
  -seg_duration 0.01 \
  
  -use_template 1 \
  
  -use_timeline 0 \
  
  -f dash $OUTPUT_PATH

  Here’s the snippet from the docs on seg_duration :

  seg_duration duration

  Set the segment length in seconds (fractional value can be set). The value is treated as average segment duration when use_template is enabled and use_timeline is disabled and as minimum segment duration for all the other use cases.

• MP4 to DASH (bash script)

  18 mars 2019, par Francesco Galgani

  I have a web site in which users can upload video files. I want to stream all of them using DASH to obtain an adaptive bitrate streaming. So I wrote a bash script (to run by cron) that converts all mp4 files to DASH, but it doesn’t work properly : what is wrong ?

  For example, using the following script, I obtained :
  https://www.informatica-libera.net/dash_faq/stream.mpd

  It validates, but it doesn’t play. I tested it on :
  http://dash-mse-test.appspot.com/dash-player.html?url=https%3A%2F%2Fwww.informatica-libera.net%2Fdash_faq%2Fstream.mpd&autoplay=on&adapt=auto&flavor=

  Thank you for any help.
  The code :

  #!/bin/bash
  
  
  
  # THIS SCRIPT CONVERTS EVERY MP4 (IN THE CURRENT FOLDER AND SUBFOLDER)
  
  # TO A MULTI-BITRATE VIDEO IN MP4-DASH
  
  # For each file "videoname.mp4" it creates a folder "dash_videoname" 
  
  # containing a dash manifest file "stream.mpd" and subfolders containing 
  
  # video segments.
  
  
  
  # mp4dash documentation and download: https://www.bento4.com/developers/dash/
  
  
  
  MYDIR=$(dirname $(readlink -f ${BASH_SOURCE[0]}))
  
  SAVEDIR=$(pwd)
  
  
  
  # Check programs
  
  if [ -z "$(which ffmpeg)" ]; then
  
      echo "Error: ffmpeg is not installed"
  
      exit 1
  
  fi
  
  
  
  if [ -z "$(which mp4dash)" ]; then
  
      echo "Error: mp4dash is not installed"
  
      exit 1
  
  fi
  
  
  
  cd "$MYDIR"
  
  
  
  TARGET_FILES=$(find ./ -type f -name "*.mp4")
  
  for f in $TARGET_FILES
  
  do
  
    f=$(basename "$f") # fullname of the file
  
    f="${f%.*}" # name without extension
  
  
  
    if [ ! -d "dash_${f}" ]; then
  
      echo "Converting \"$f\" to multi-bitrate video in MPEG-DASH"
  
  
  
      ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 1500k -vf "scale=-2:720" -f mp4 -pass 1 -y /dev/null
  
      ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 1500k -vf "scale=-2:720" -f mp4 -pass 2 "${f}_1500.mp4"
  
  
  
      ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 800k -vf "scale=-2:540" -f mp4 -pass 1 -y /dev/null
  
      ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 800k -vf "scale=-2:540" -f mp4 -pass 2 "${f}_800.mp4"
  
  
  
      ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 400k -vf "scale=-2:360" -f mp4 -pass 1 -y /dev/null
  
      ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 400k -vf "scale=-2:360" -f mp4 -pass 2 "${f}_400.mp4"
  
  
  
      ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 200k -vf "scale=-2:180" -f mp4 -pass 1 -y /dev/null
  
      ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 200k -vf "scale=-2:180" -f mp4 -pass 2 "${f}_200.mp4"
  
  
  
      rm -f ffmpeg*log*
  
  
  
      mp4fragment "${f}_1500.mp4" "${f}_1500_fragmented.mp4"
  
      mp4fragment "${f}_800.mp4" "${f}_800_fragmented.mp4"
  
      mp4fragment "${f}_400.mp4" "${f}_400_fragmented.mp4"
  
      mp4fragment "${f}_200.mp4" "${f}_200_fragmented.mp4"
  
  
  
      rm -f "${f}_1500.mp4" "${f}_800.mp4" "${f}_400.mp4" "${f}_200.mp4"
  
  
  
      mp4dash -v -o "dash_${f}" "${f}_1500_fragmented.mp4" "${f}_800_fragmented.mp4" "${f}_400_fragmented.mp4" "${f}_200_fragmented.mp4"
  
  
  
      rm -f "${f}_1500_fragmented.mp4" "${f}_800_fragmented.mp4" "${f}_400_fragmented.mp4" "${f}_200_fragmented.mp4"
  
  
  
      fi
  
  
  
  done
  
  
  
  cd "$SAVEDIR"

• MP4 to DASH (bash script)

  13 mars 2017, par francesco.galgani

  I have a web site in which users can upload video files. I want to stream all of them using DASH to obtain an adaptive bitrate streaming. So I wrote a bash script (to run by cron) that converts all mp4 files to DASH, but it doesn’t work properly : what is wrong ?

  For example, using the following script, I obtained :
  https://www.informatica-libera.net/dash_faq/stream.mpd

  It validates, but it doesn’t play. I tested it on :
  http://dash-mse-test.appspot.com/dash-player.html?url=https%3A%2F%2Fwww.informatica-libera.net%2Fdash_faq%2Fstream.mpd&autoplay=on&adapt=auto&flavor=

  Thank you for any help.
  The code :

  #!/bin/bash
  
  
  
  # THIS SCRIPT CONVERTS EVERY MP4 (IN THE CURRENT FOLDER AND SUBFOLDER)
  
  # TO A MULTI-BITRATE VIDEO IN MP4-DASH
  
  # For each file "videoname.mp4" it creates a folder "dash_videoname" 
  
  # containing a dash manifest file "stream.mpd" and subfolders containing 
  
  # video segments.
  
  
  
  # mp4dash documentation and download: https://www.bento4.com/developers/dash/
  
  
  
  MYDIR=$(dirname $(readlink -f ${BASH_SOURCE[0]}))
  
  SAVEDIR=$(pwd)
  
  
  
  # Check programs
  
  if [ -z "$(which ffmpeg)" ]; then
  
      echo "Error: ffmpeg is not installed"
  
      exit 1
  
  fi
  
  
  
  if [ -z "$(which mp4dash)" ]; then
  
      echo "Error: mp4dash is not installed"
  
      exit 1
  
  fi
  
  
  
  cd "$MYDIR"
  
  
  
  TARGET_FILES=$(find ./ -type f -name "*.mp4")
  
  for f in $TARGET_FILES
  
  do
  
    f=$(basename "$f") # fullname of the file
  
    f="${f%.*}" # name without extension
  
  
  
    if [ ! -d "dash_${f}" ]; then
  
      echo "Converting \"$f\" to multi-bitrate video in MPEG-DASH"
  
  
  
      ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 1500k -vf "scale=-2:720" -f mp4 -pass 1 -y /dev/null
  
      ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 1500k -vf "scale=-2:720" -f mp4 -pass 2 "${f}_1500.mp4"
  
  
  
      ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 800k -vf "scale=-2:540" -f mp4 -pass 1 -y /dev/null
  
      ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 800k -vf "scale=-2:540" -f mp4 -pass 2 "${f}_800.mp4"
  
  
  
      ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 400k -vf "scale=-2:360" -f mp4 -pass 1 -y /dev/null
  
      ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 400k -vf "scale=-2:360" -f mp4 -pass 2 "${f}_400.mp4"
  
  
  
      ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 200k -vf "scale=-2:180" -f mp4 -pass 1 -y /dev/null
  
      ffmpeg -y -i "${f}.mp4" -c:a libfdk_aac -ac 2 -ab 128k -c:v libx264 -x264opts 'keyint=24:min-keyint=24:no-scenecut' -b:v 200k -vf "scale=-2:180" -f mp4 -pass 2 "${f}_200.mp4"
  
  
  
      rm -f ffmpeg*log*
  
  
  
      mp4fragment "${f}_1500.mp4" "${f}_1500_fragmented.mp4"
  
      mp4fragment "${f}_800.mp4" "${f}_800_fragmented.mp4"
  
      mp4fragment "${f}_400.mp4" "${f}_400_fragmented.mp4"
  
      mp4fragment "${f}_200.mp4" "${f}_200_fragmented.mp4"
  
  
  
      rm -f "${f}_1500.mp4" "${f}_800.mp4" "${f}_400.mp4" "${f}_200.mp4"
  
  
  
      mp4dash -v -o "dash_${f}" "${f}_1500_fragmented.mp4" "${f}_800_fragmented.mp4" "${f}_400_fragmented.mp4" "${f}_200_fragmented.mp4"
  
  
  
      rm -f "${f}_1500_fragmented.mp4" "${f}_800_fragmented.mp4" "${f}_400_fragmented.mp4" "${f}_200_fragmented.mp4"
  
  
  
      fi
  
  
  
  done
  
  
  
  cd "$SAVEDIR"