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  • (Dés)Activation de fonctionnalités (plugins)

    18 février 2011, par

    Pour gérer l’ajout et la suppression de fonctionnalités supplémentaires (ou plugins), MediaSPIP utilise à partir de la version 0.2 SVP.
    SVP permet l’activation facile de plugins depuis l’espace de configuration de MediaSPIP.
    Pour y accéder, il suffit de se rendre dans l’espace de configuration puis de se rendre sur la page "Gestion des plugins".
    MediaSPIP est fourni par défaut avec l’ensemble des plugins dits "compatibles", ils ont été testés et intégrés afin de fonctionner parfaitement avec chaque (...)

  • Activation de l’inscription des visiteurs

    12 avril 2011, par

    Il est également possible d’activer l’inscription des visiteurs ce qui permettra à tout un chacun d’ouvrir soit même un compte sur le canal en question dans le cadre de projets ouverts par exemple.
    Pour ce faire, il suffit d’aller dans l’espace de configuration du site en choisissant le sous menus "Gestion des utilisateurs". Le premier formulaire visible correspond à cette fonctionnalité.
    Par défaut, MediaSPIP a créé lors de son initialisation un élément de menu dans le menu du haut de la page menant (...)

  • Support audio et vidéo HTML5

    10 avril 2011

    MediaSPIP utilise les balises HTML5 video et audio pour la lecture de documents multimedia en profitant des dernières innovations du W3C supportées par les navigateurs modernes.
    Pour les navigateurs plus anciens, le lecteur flash Flowplayer est utilisé.
    Le lecteur HTML5 utilisé a été spécifiquement créé pour MediaSPIP : il est complètement modifiable graphiquement pour correspondre à un thème choisi.
    Ces technologies permettent de distribuer vidéo et son à la fois sur des ordinateurs conventionnels (...)

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  • Official Piwik Training in Berlin – 2014, June 6th

    6 mai 2014, par Piwik Core Team — Community

    This event will focus on providing training to users of the Piwik analytics platform. The training will provide attendees with the necessary skills and knowledge that they will need to be able to take their website to the next level with Piwik.

    Language : English

    Register to Piwik Training now.

    Location : The 25hours Hotel Bikini Berlin is as diverse as the big city it is located in and as wild as a jungle. The hotel showcases cosmopolitan Berlin at its location in the listed Bikini-Haus building between the Tiergarten park and Breitscheidplatz with Kaiser Wilhelm Memorial Church.

    Piwik Training Location - Berlin 25hours Hotel Bikini Berlin

    Why do you need training ?

    If you have just started using Piwik and are finding it a bit overwhelming, this training event will benefit you immensely. You will be able to learn all the necessary skills that will allow you move forward with Piwik.

    For users who have been using Piwik for a short time and have a bit of experience in using Piwik, you will be able to learn how to advance your skills and extend your knowledge of the Piwik platform.

    Advanced users will be able to gain more knowledge about the complex features and functions that Piwik incorporates, allowing you to customise different areas of the platform and learn about advanced topics.

    How can you benefit from this training event ?

    By understanding how Piwik works and how to use and operate Piwik more effectively, you will be able to make sound changes to your website that will allow you to achieve your business goals.

    Everyone, from ecommerce businesses to government organisations can benefit from this training event and learn the essential skills and gain the relevant knowledge to meet their goals and requirements.

    Some of the skills that you will learn during the training include :

    • How to install and get started with the Piwik platform
    • How Piwik will add value to your website
    • How to analyse and make sense of the data and information that you collect
    • How to create custom segments that will allow you to report on certain data and information
    • Advance exercises – Piwik settings, tweaking and basic diagnostics

    What equipment do I need in order to participate in the event ?

    You will need a computer that is able to connect to a Wifi network

    Are the tickets transferable ?

    Yes, the tickets are transferable.

    What is the refund policy on the tickets ?

    You are entitled to a refund up to 1 week before the commencement of the training.

    Training details

    <script type="text/javascript">          (function() { var scribd = document.createElement("script"); scribd.type = "text/javascript"; scribd.async = true; scribd.src = "#{root_url}javascripts/embed_code/inject.js"; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(scribd, s); })()        </script>

    Contact us : contact@piwik.pro

    Registrations

    Register to Piwik Training now !

  • FFmpeg : How to create rotating 3D (haas) effect in mp3 using ffmpeg ?

    7 février 2024, par ankushalg

    I want to add a rotating 3d effect (Haas effect) in mp3. I mean that the audio will seem to change its directions from left to right and vice versa periodically (as shown below) when listened through the headphone. For this, I searched on the Internet and tried to achieve it in the following ways :

    


      

    1. Firstly, I thought, if I change the audio of the left and right channel periodically (like when the right channel has full volume (100%), left channel has low volume (20%) and vice versa) then I can achieve it, but it's not like 3D.

      2. 


    2. Secondly, when I researched more than found that it is done by creating a delay between the two channels. I found that I can create a delay of 0.0 to 0.8 milliseconds according to requirement.
To do this, I use the following commands in FFmpeg :

      3. 


    


    Step 1 : Splitting Audio Channels :

    


    ffmpeg -i D:\ffmpeg\Down.mp3 -map_channel 0.0.0 D:\ffmpeg\L.mp3 -map_channel 0.0.1 D:\ffmpeg\R.mp3


    


    Stem 2 : Splitting Left channel into parts :

    


    


    Note : We will only change the speed of Left channel so we split left
channel into 4 seconds parts.

    


    


    ffmpeg -i D:\ffmpeg\L.mp3 -f segment -segment_time 4 D:\ffmpeg\Split\%03d.mp3


    


    Step 3 : Changing the tempo of each part

    


    


    Now We change the tempo (speed) of each part so it may feel like the sound
is moving from left to right and vice versa

    


    


    ffmpeg -y -i D:\ffmpeg\Split\000.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\000.mp3
ffmpeg -y -i D:\ffmpeg\Split\001.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\001.mp3
ffmpeg -y -i D:\ffmpeg\Split\002.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\002.mp3
ffmpeg -y -i D:\ffmpeg\Split\003.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\003.mp3
ffmpeg -y -i D:\ffmpeg\Split\004.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\004.mp3
ffmpeg -y -i D:\ffmpeg\Split\005.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\005.mp3
ffmpeg -y -i D:\ffmpeg\Split\006.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\006.mp3
ffmpeg -y -i D:\ffmpeg\Split\007.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\007.mp3
ffmpeg -y -i D:\ffmpeg\Split\008.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\008.mp3
ffmpeg -y -i D:\ffmpeg\Split\009.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\009.mp3
ffmpeg -y -i D:\ffmpeg\Split\010.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\010.mp3
ffmpeg -y -i D:\ffmpeg\Split\011.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\011.mp3
ffmpeg -y -i D:\ffmpeg\Split\012.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\012.mp3
ffmpeg -y -i D:\ffmpeg\Split\013.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\013.mp3
ffmpeg -y -i D:\ffmpeg\Split\014.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\014.mp3
ffmpeg -y -i D:\ffmpeg\Split\015.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\015.mp3
ffmpeg -y -i D:\ffmpeg\Split\016.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\016.mp3
ffmpeg -y -i D:\ffmpeg\Split\017.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\017.mp3
ffmpeg -y -i D:\ffmpeg\Split\018.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\018.mp3
ffmpeg -y -i D:\ffmpeg\Split\019.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\019.mp3
ffmpeg -y -i D:\ffmpeg\Split\020.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\020.mp3
ffmpeg -y -i D:\ffmpeg\Split\021.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\021.mp3
ffmpeg -y -i D:\ffmpeg\Split\022.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\022.mp3
ffmpeg -y -i D:\ffmpeg\Split\023.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\023.mp3
ffmpeg -y -i D:\ffmpeg\Split\024.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\024.mp3
ffmpeg -y -i D:\ffmpeg\Split\025.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\025.mp3
ffmpeg -y -i D:\ffmpeg\Split\026.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\026.mp3
ffmpeg -y -i D:\ffmpeg\Split\027.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\027.mp3
ffmpeg -y -i D:\ffmpeg\Split\028.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\028.mp3
ffmpeg -y -i D:\ffmpeg\Split\029.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\029.mp3
ffmpeg -y -i D:\ffmpeg\Split\030.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\030.mp3
ffmpeg -y -i D:\ffmpeg\Split\031.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\031.mp3
ffmpeg -y -i D:\ffmpeg\Split\032.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\032.mp3
ffmpeg -y -i D:\ffmpeg\Split\033.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\033.mp3
ffmpeg -y -i D:\ffmpeg\Split\034.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\034.mp3
ffmpeg -y -i D:\ffmpeg\Split\035.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\035.mp3
ffmpeg -y -i D:\ffmpeg\Split\036.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\036.mp3
ffmpeg -y -i D:\ffmpeg\Split\037.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\037.mp3
ffmpeg -y -i D:\ffmpeg\Split\038.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\038.mp3
ffmpeg -y -i D:\ffmpeg\Split\039.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\039.mp3
ffmpeg -y -i D:\ffmpeg\Split\040.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\040.mp3
ffmpeg -y -i D:\ffmpeg\Split\041.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\041.mp3
ffmpeg -y -i D:\ffmpeg\Split\042.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\042.mp3
ffmpeg -y -i D:\ffmpeg\Split\043.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\043.mp3
ffmpeg -y -i D:\ffmpeg\Split\044.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\044.mp3
ffmpeg -y -i D:\ffmpeg\Split\045.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\045.mp3
ffmpeg -y -i D:\ffmpeg\Split\046.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\046.mp3
ffmpeg -y -i D:\ffmpeg\Split\047.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\047.mp3
ffmpeg -y -i D:\ffmpeg\Split\048.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\048.mp3
ffmpeg -y -i D:\ffmpeg\Split\049.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\049.mp3
ffmpeg -y -i D:\ffmpeg\Split\050.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\050.mp3
ffmpeg -y -i D:\ffmpeg\Split\051.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\051.mp3
ffmpeg -y -i D:\ffmpeg\Split\052.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\052.mp3
ffmpeg -y -i D:\ffmpeg\Split\053.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\053.mp3
ffmpeg -y -i D:\ffmpeg\Split\054.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\054.mp3


    


    


    Here I used 1.0000 for normal speed
and 1.0008 for increased speed
and 0.9992 for decreased speed

    


    


    Spet 4 : Merging small pieces of audio

    


    ffmpeg -f concat -safe 0 -i D:\ffmpeg\f.txt -c copy D:\ffmpeg\output.mp3


    


    where f.txt contains :

    


    file 'D:\ffmpeg\Modi\000.mp3'
file 'D:\ffmpeg\Modi\001.mp3'
file 'D:\ffmpeg\Modi\002.mp3'
file 'D:\ffmpeg\Modi\003.mp3'
file 'D:\ffmpeg\Modi\004.mp3'
file 'D:\ffmpeg\Modi\005.mp3'
file 'D:\ffmpeg\Modi\006.mp3'
file 'D:\ffmpeg\Modi\007.mp3'
file 'D:\ffmpeg\Modi\008.mp3'
file 'D:\ffmpeg\Modi\009.mp3'
file 'D:\ffmpeg\Modi\010.mp3'
file 'D:\ffmpeg\Modi\011.mp3'
file 'D:\ffmpeg\Modi\012.mp3'
file 'D:\ffmpeg\Modi\013.mp3'
file 'D:\ffmpeg\Modi\014.mp3'
file 'D:\ffmpeg\Modi\015.mp3'
file 'D:\ffmpeg\Modi\016.mp3'
file 'D:\ffmpeg\Modi\017.mp3'
file 'D:\ffmpeg\Modi\018.mp3'
file 'D:\ffmpeg\Modi\019.mp3'
file 'D:\ffmpeg\Modi\020.mp3'
file 'D:\ffmpeg\Modi\021.mp3'
file 'D:\ffmpeg\Modi\022.mp3'
file 'D:\ffmpeg\Modi\023.mp3'
file 'D:\ffmpeg\Modi\024.mp3'


    


    Step 5 : The last operation is combining the both channels :

    


    ffmpeg -i D:\ffmpeg\L.mp3 -i D:\ffmpeg\output.mp3 -filter_complex [0:a][1:a]amerge=inputs=2[aout] -map [aout] D:\ffmpeg\LRM.mp3


    


    But even then the result is very poor. It looks like FFmpeg combines audio in Step 4 took a delay after each audio.

    


    I think there may be some bug in my solution. I don't think that I can change tempo like this in audio without splitting the audio(Let me know if I am wrong).

    


    Does anyone have a different solution to achieve this ?
Please help me in this. Thanks in advance...

    


  • FFmpeg : How to create rotating 3D(haas) effect in mp3 using ffmpeg ?

    30 octobre 2018, par Ankush

    I want to add a rotating 3d effect(Haas effect) in mp3. I mean that the audio will seem to change its directions from left to right and vice versa periodically(as shown below) when listened through the headphone. For this, I searched on the Internet and tried to achieve it in the following ways :

    1. Firstly, I thought, if I change the audio of the left and right channel periodically( Like when the Right channel has full volume(100%), Left channel has low volume(20%) and vice versa) then I can achieve it but it’s not like 3D.
    2. Secondly, When I researched more than found that It is done by creating a delay between the two channels. I found that I can create a delay of 0.0 to 0.8 milliseconds according to requirement.
      To do this, I use the following commands in FFmpeg :

    Step 1 : Splitting Audio Channels :

    ffmpeg -i D:\ffmpeg\Down.mp3 -map_channel 0.0.0 D:\ffmpeg\L.mp3 -map_channel 0.0.1 D:\ffmpeg\R.mp3

    Stem 2 : Splitting Left channel into parts :

    Note : We will only change the speed of Left channel so we split Left
    channel into 4 seconds parts.

    ffmpeg -i D:\ffmpeg\L.mp3 -f segment -segment_time 4 D:\ffmpeg\Split\%03d.mp3

    Step 3 : Changing the tempo of each part

    Now We change the tempo (speed) of each part so it may feel like the sound
    is moving from left to right and vice versa

    ffmpeg -y -i D:\ffmpeg\Split\000.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\000.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\001.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\001.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\002.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\002.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\003.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\003.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\004.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\004.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\005.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\005.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\006.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\006.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\007.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\007.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\008.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\008.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\009.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\009.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\010.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\010.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\011.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\011.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\012.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\012.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\013.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\013.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\014.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\014.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\015.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\015.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\016.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\016.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\017.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\017.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\018.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\018.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\019.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\019.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\020.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\020.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\021.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\021.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\022.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\022.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\023.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\023.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\024.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\024.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\025.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\025.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\026.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\026.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\027.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\027.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\028.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\028.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\029.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\029.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\030.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\030.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\031.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\031.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\032.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\032.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\033.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\033.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\034.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\034.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\035.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\035.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\036.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\036.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\037.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\037.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\038.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\038.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\039.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\039.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\040.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\040.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\041.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\041.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\042.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\042.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\043.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\043.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\044.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\044.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\045.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\045.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\046.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\046.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\047.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\047.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\048.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\048.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\049.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\049.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\050.mp3 -af atempo=0.9992 D:\ffmpeg\Modi\050.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\051.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\051.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\052.mp3 -af atempo=1.0008 D:\ffmpeg\Modi\052.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\053.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\053.mp3
    
ffmpeg -y -i D:\ffmpeg\Split\054.mp3 -af atempo=1.0000 D:\ffmpeg\Modi\054.mp3

    Here I used 1.0000 for normal speed
    and 1.0008 for increased speed
    and 0.9992 for decreased speed

    Spet 4 : Merging small pieces of audio

    ffmpeg -f concat -safe 0 -i D:\ffmpeg\f.txt -c copy D:\ffmpeg\output.mp3

    where f.txt contains :

    file 'D:\ffmpeg\Modi\000.mp3'
    
file 'D:\ffmpeg\Modi\001.mp3'
    
file 'D:\ffmpeg\Modi\002.mp3'
    
file 'D:\ffmpeg\Modi\003.mp3'
    
file 'D:\ffmpeg\Modi\004.mp3'
    
file 'D:\ffmpeg\Modi\005.mp3'
    
file 'D:\ffmpeg\Modi\006.mp3'
    
file 'D:\ffmpeg\Modi\007.mp3'
    
file 'D:\ffmpeg\Modi\008.mp3'
    
file 'D:\ffmpeg\Modi\009.mp3'
    
file 'D:\ffmpeg\Modi\010.mp3'
    
file 'D:\ffmpeg\Modi\011.mp3'
    
file 'D:\ffmpeg\Modi\012.mp3'
    
file 'D:\ffmpeg\Modi\013.mp3'
    
file 'D:\ffmpeg\Modi\014.mp3'
    
file 'D:\ffmpeg\Modi\015.mp3'
    
file 'D:\ffmpeg\Modi\016.mp3'
    
file 'D:\ffmpeg\Modi\017.mp3'
    
file 'D:\ffmpeg\Modi\018.mp3'
    
file 'D:\ffmpeg\Modi\019.mp3'
    
file 'D:\ffmpeg\Modi\020.mp3'
    
file 'D:\ffmpeg\Modi\021.mp3'
    
file 'D:\ffmpeg\Modi\022.mp3'
    
file 'D:\ffmpeg\Modi\023.mp3'
    
file 'D:\ffmpeg\Modi\024.mp3'

    Step 5 : The last operation is combining the both channels :

    ffmpeg -i D:\ffmpeg\L.mp3 -i D:\ffmpeg\output.mp3 -filter_complex [0:a][1:a]amerge=inputs=2[aout] -map [aout] D:\ffmpeg\LRM.mp3

    But even then the result is very poor. It looks like FFmpeg combines audio in Step 4 took a delay after each audio.

    I think there may be some bug in my solution. I don’t think that I can change tempo like this in audio without splitting the audio(Let me know if I am wrong).

    Does anyone have a different solution to achieve this ?
    Please help me in this. Thanks in advance...

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