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• Bash script : automate ffmpeg encoding for mpeg-dash

  13 février 2018, par Massimo Vantaggio

  I’m writing a bash file to create video encoding and concatenation for dash live streaming use,
  Basically it read an input video folder, encodes all videos into three resolution formats, after that it concatening them to create three adaption sets.

  DIAGRAM :

  

  This script checks for fps conformance,

  force/scaling resolution if the input is not 1920 x 1080p,

  Insert the channel logo png,

  Cut the end of all videos input in order to make them finish with closed gop, this to ensure that there are not videos with audio and video track with different lenght.

  ISSUE :

  Actually I’m not sure that the concatenation process respects the closed GOP alignment as it after the encoding..
  I try to cut also the end of the concatenation result in order to make it finish without decimals on a closed gop too, but im unable to erase all decimals from the total duration :

  total duration in seconds: 826.795000
  
  total duration corrected in seconds: 826

  But the real duration measured by ffprobe is

  824.044000

  I try to check keyframes alignment with mp4box has they teach without any result :

  MP4Box -info TRACK_ID source1.mp4 2>&1 | grep GOP

  This is the first time that i work with "video scripts" and probably i don’t know what input to give for TRACK_ID

  BASH SCRIPT :

  #!/bin/bash
  
  #CANCAT 0.2
  
  
  
  cd input
  
  times=()
  
  fps=()
  
  for f in *.mp4; do
  
  
  
      _t=$(ffprobe -i "$f" -show_entries format=duration -v quiet -of csv="p=0")
  
      times+=("$_t")
  
  
  
      _f=$(ffmpeg -i "$f" 2>&1 | sed -n "s/.*, \\(.*\\) fp.*/\\1/p")
  
      fps+=("$_f")
  
  done
  
  #SUM ALL DURATIONS
  
  TOTALDURATION=$( echo "${times[@]}" | sed 's/ /+/g' | bc )
  
  #DELETE DECIMAL
  
  DURROUND=$(echo "$TOTALDURATION" | cut -d'.' -f1) 
  
  #GET REST OF DIVISION BY 2 AS GOP
  
  TOTDELTA="$((DURROUND%2))"
  
  #SUBTRACT DELTA FROM TOTAL DURATION
  
  TOTDUR="$(($DURROUND-$TOTDELTA))"
  
  
  
  #GET NUMBER OF ELEMENTS IN FPS ARRAY  
  
  tLen=${#fps[@]}
  
  #CHECK FPS EQUALITY     
  
  for tLen in "${fps[@]:1}"; do
  
      if [[ $tLen != ${fps[0]} ]]; then
  
          printf "WARNING: VIDEO’S FRAME-RATE ARE NOT EQUALS, THE PROCESS CAN’T START."
  
          printf "%s\\0" "${fps[@]}" |
  
              sort -zu |
  
              xargs -0 printf " %s"
  
          printf "\\n"
  
         exit 1
  
      fi
  
  done
  
  for f in *.mp4; do
  
  #GET DURATION OF EACH VIDEO
  
  DUR="$(ffprobe -i "$f" -show_entries format=duration -v quiet -of csv="p=0")"
  
  DUR=$(echo "$DUR" | cut -d'.' -f1) # DELETE DECIMAL
  
  #GET FPS OF EACH VIDEO
  
  FPS="$(ffmpeg -i "$f" 2>&1 | sed -n "s/.*, \(.*\) fp.*/\1/p")"
  
  #ROUND FPS OF EACH VIDEO
  
  FPSC=$( echo "($FPS+0.5)/1" | bc )
  
  #REMOVE EXTENSION FROM VIDEO FILE NAME
  
  NAME=$(echo "$f" | cut -d'.' -f1)
  
  
  
  #GET GOP
  
  GOP="$((FPSC*2))"
  
  DELTADUR="$((DUR%2))"
  
  DUR="$(($DUR-$DELTADUR))"
  
  
  
  #ENCODE 1080p
  
  ffmpeg -y -i "$f" -i ../logo/logo.png -c:a aac -b:a 384k -ar 48000 -ac 2 -async 1 -c:v libx264 -x264opts keyint=$GOP:min-keyint=$GOP:no-scenecut -bf 0 -r $FPSC -b:v 4800k -maxrate 4800k -bufsize 3000k -profile:v main -crf 22 -t $DUR -filter_complex "[0:v][1:v]overlay=main_w-overlay_w-10:10,scale=1920:1080,setsar=1" ../buffer/${NAME}-1080.mp4
  
  
  
  #ENCODE 720p
  
  ffmpeg -y -i ../buffer/${NAME}-1080.mp4 -c:a aac -b:a 256k -ar 48000 -ac 2 -async 1 -c:v libx264 -x264opts keyint=$GOP:min-keyint=$GOP:no-scenecut -bf 0 -s 1280x720 -r $FPSC -b:v 2400k -maxrate 2400k -bufsize 1500k -profile:v main -crf 22 -t $DUR ../buffer/${NAME}-720.mp4
  
  
  
  #ENCODE 360p
  
  ffmpeg -y -i ../buffer/${NAME}-720.mp4 -c:a aac -b:a 128k -ar 48000 -ac 2 -async 1 -c:v libx264 -x264opts keyint=$GOP:min-keyint=$GOP:no-scenecut -bf 0 -s 640x360 -r $FPSC -b:v 800k -maxrate 800k -bufsize 500k -profile:v main -crf 22 -t $DUR ../buffer/${NAME}-360.mp4
  
  done
  
  
  
  
  
  #enter in buffer
  
  cd ..
  
  cd buffer
  
  
  
  #CONCAT 1080 SET
  
  # with a bash for loop
  
  for f in ./*1080.mp4; do echo "file '$f'" >> 1080list.txt; done
  
  
  
  ffmpeg -f concat -safe 0 -i 1080list.txt -t $TOTDUR -c copy ../output/1080set.mp4
  
  
  
  #CONCAT 720 SET
  
  # with a bash for loop
  
  for f in ./*720.mp4; do echo "file '$f'" >> 720list.txt; done
  
  
  
  ffmpeg -f concat -safe 0 -i 720list.txt -t $TOTDUR -c copy ../output/720set.mp4
  
  
  
  #CONCAT 360 SET
  
  # with a bash for loop
  
  for f in ./*360.mp4; do echo "file '$f'" >> 360list.txt; done
  
  
  
  ffmpeg -f concat -safe 0 -i 360list.txt -t $TOTDUR -c copy ../output/360set.mp4
  
  
  
  #CLEAN BUFFER
  
  rm *.mp4
  
  rm *.txt
  
  
  
  echo "CONCAT COMPLETED:"
  
  echo "frame-rate: $fps"
  
  echo "total duration in seconds: $TOTALDURATION"
  
  echo "total duration corrected in seconds: $TOTDUR"

  The full file with relative folders :

  BASH SCRIPT WITH FOLDERS

  RESULT VIDEO

  There is someone who can help me to understand why I can not eliminate the decimals of the total duration during concat ?
  And how to check overall keyframes allignment ?
  Also any impovement that i ignore is welcome !

  Thanks a lot !

  Massimo

• Reading frames from MP4 segment (.m4s). or Dash Segment [closed]

  24 septembre 2020, par Vamsi Krishna Rayapati

  Generally we do it by

  


  copying init.mp4 and segment1.m4s to a video file and extract frames in that video

  


  It works fine. But it requires a temporary file

  


  I want to edit segment1.m4s directly

  


  ''' my idea is to decode the video
Direclty with out using init file '''

  


  Help me .how to do it ?

  


• Getting a single mp4 file from dash and a mpd file [closed]

  15 août 2023, par Govind Sharma

  I want to ask that I have downloaded data which contains audio and video data separately like 1.mp4, 2.mp4 etc in both audio and video folders. enter image description here
I also have it's .mpd file. How can I play this video ? or is there any way I can combine both videos and audio files in a single one. Single file for e.g. 1.mp4 video or audio nothing seem to play.

  


  I trued using ffmpeg but it gave a blurr video