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  • Anomalie #1970 (Fermé) : Pas de crochets dans le HTML !

    26 mars 2011, par cedric -

    corrigé par r17527

  • Revision 34267 : {{{ #DATE_DEBUT }}} dans les forums, c’est le 1er janvier 1970, ce qui ne ...

    7 janvier 2010, par fil@… — Log

    #DATE_DEBUT dans les forums, c’est le 1er janvier 1970, ce qui ne m’arrange pas car je n’etais pas encore ne

  • How can I add chapters to a mp4 file using bash script and ffmpeg

    17 septembre 2023, par Rick T

    I'm trying to add chapters to an mp4 file using bash and ffmpeg. The chapters are located in a file called chapters.txt. When the bash script is run which is called add_chapters.sh it reads the chapters.txt file and creates a file called chapters.ffmetadata. The issue is that the START and END times in the file chapters.ffmetadata aren't being created correctly. How can I fix this ?

    


      

    1. I have a file called chapters.txt that has the chapters in it.

      


      00:00:00=Intro
00:02:12=What are selections
00:03:19=Booleans


      


    2. 


    3. The bash file I run is add_chapters.sh

      


      The code in it is :

      


      #!/bin/bash

input_file="chapters.txt"
output_file="chapters.ffmetadata"

# Create the FFmetadata chapter file
echo ";FFMETADATA1" > "$output_file"

previous_seconds=0

while IFS="=" read -r timestamp chapter_name; do
    # Convert start time to seconds
    seconds=$(date -u -d "1970-01-01 $timestamp" +"%s")

    # Calculate the end time (previous chapter's start time)
    end_seconds=$previous_seconds

    # Update previous_seconds for the next iteration
    previous_seconds=$seconds

    echo "[CHAPTER]" >> "$output_file"
    echo "TIMEBASE=1/1000" >> "$output_file"
    echo "START=${end_seconds}000" >> "$output_file"
    echo "END=${seconds}000" >> "$output_file"
    echo "title=$chapter_name" >> "$output_file"
done < "$input_file"

echo "Chapter file '$output_file' created successfully."

# Run FFmpeg to add chapters to the video
ffmpeg -i input_video.mp4 -i chapters.ffmetadata -map_metadata 1 -c:v copy -c:a copy -y output_video.mp4


      


    4. 


    5. It creates a file called chapters.ffmetadata

      


      ;FFMETADATA1
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=0000
title=Intro
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=132000
title=What are selections
[CHAPTER]
TIMEBASE=1/1000
START=132000
END=199000
title=Booleans
[CHAPTER]
TIMEBASE=1/1000
START=199000
END=0000
title=


      


      The START and END times aren't being calculated correctly. How can I fix this ?

      


    6. 


    



    


    UPDATE #1

    


    I'm almost there thanks to @Freeman code / answer.

    


    The issues in the generated
chapters.ffmetadata file are just.

    


      

    1. The first START= and END= are 0000

      


    2. 


    3. The Intro Chapter doesn't show up (most likely caused by the first START= and END= being 0000)

      


    4. 


    5. The Chapters seem to be shifted down by one timecode line (most likely caused by the first START= and END= being 0000)

      


       ;FFMETADATA1
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=0000
title=Intro
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=132000
title=What are selections ?
[CHAPTER]
TIMEBASE=1/1000
START=132000
END=199000
title=Booleans
[CHAPTER]
TIMEBASE=1/1000
START=199000
END=0000
title=
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=4459000
title=

      


    6. 


    



    


    UPDATE #2

    


    Strange ; I tried the changes @Freeman suggested but an error comes up now.

    


    Chapter end time 0 before start 199000
chapters.ffmetadata : Cannot allocate memory

    


    ;FFMETADATA1
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=0000
title=Intro
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=132000
title=What are selections?
[CHAPTER]
TIMEBASE=1/1000
START=132000
END=199000
title=Booleans
[CHAPTER]
TIMEBASE=1/1000
START=199000
END=0000
title=
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=4459000
title=


    



    


    UPDATE #3 using his awk changes

    


    ;FFMETADATA1
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=0000
title=Intro
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=132000
title=What are selections?
[CHAPTER]
TIMEBASE=1/1000
START=132000
END=199000
title=Booleans
[CHAPTER]
TIMEBASE=1/1000
START=199000
END=0000
title=