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    5 septembre 2013, par

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    Présentez les changements dans votre MédiaSPIP ou les actualités de vos projets sur votre MédiaSPIP grâce à la rubrique actualités.
    Dans le thème par défaut spipeo de MédiaSPIP, les actualités sont affichées en bas de la page principale sous les éditoriaux.
    Vous pouvez personnaliser le formulaire de création d’une actualité.
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    Puis-je poster des contenus à partir d’une tablette Ipad ?
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Sur d’autres sites (6955)

  • 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

    


  • 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 ?

    


  • 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 :

    enter image description here

    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