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Sur d’autres sites (15820)

  • FFmpeg command to loop an audio starting from a sample twice and add a fade out

    27 juin 2022, par Victor Lopes

    I have some audio files and I want to use FFmpeg to loop them twice, but starting from a given sample (I have the sample numbers), and add a 5 seconds fade-out at the end. The output has to be a video : a static .png on the same folder with the audio playing on top of it (copying the same audio codec to preserve the quality).

    


    For example, for this input audio I am supposed to get this output video. Here I used Audacity to loop and fade the audio starting from the sample 43190, and the following FFmpeg command to add the image to it :

    


    ffmpeg -r 1 -loop 1 -i "Sonic 3 Tile.png" -i "Angel Island Zone Act 1 - LOOP.ogg" -acodec copy -r 1 -shortest -vf scale=1280:1280 "Angel Island Zone Act 1.mkv"


    


    The thing is, I want to be able to do it all at once, using FFmpeg to loop and fade instead of Audacity. Is it possible ? If so, what command should I use ? Just a reminder, the audio has to be looped twice.

    


  • Does anyone find this useful ? - Compiling FFMPEG on Windows with Cywin and NDK r5 [closed]

    5 avril 2017, par protectedmember

    Does anyone find this information useful in anyway ?

    I’ve been trying to compile this thing for a while now and I know of the numerous posts floating around the internet offering help. I have read and tried most of the suggestions and wanted to colate my success into this single post for others to benefit from.

    Since I don’t have a blog, I thought it wouldn’t hurt to post on here instead.

    I have managed to compile FFMPEG 0.10.3 (Freedom) on Windows 7 (32 bit) using NDK r5 and Cygwin. The steps :

    1 - Download/install Cygwin in the root of your C drive. I’m not going to give instructions on this, it’s simple enough and there are plenty of tutorials on this.

    2 - Download NDK r5 from here and extract to the root of your C drive.

    3 - Download FFMPEG 0.10.3 from here and extract to the root of your C drive.

    4 - Open the file ’configure’ in the root of the FFMPEG directory in a text editor.

    5 - Comment out lines 2073, 2074 and 2075.

    6 - Below 2075, add the following line :

    TMPDIR=c :/cygwin/tmp

    7 - Download this script (thankyou roman10) and place it inside your FFMPEG root directory. Rename the file to

    build_android.sh

    8 - Open the script in a text editor and edit line 17 to read

    c :/android-ndk-r5

    9 - Click start > run and type "bash" (without the speech marks) and press enter.

    10 - Type the following and press enter :

    cd /cygdrive/c/ffmpeg-0.10.3

    11 - Type the following and press enter :

    dos2unix build_andoird.sh

    12 - Type the following and press enter :

    ./build_android.sh

    13 - Sit back and wait... libffmpeg.so will soon appear in your "c :\ffmpeg-0.10.3\android\" directory (where is defined in the bottom of the script from roman10’s blog). The default architecture is armv7-a.

    The script from roman10’s blog will actually compile quite a large shared object (.so) file. The compiler flags can be adjusted to suit your needs in the script from roman10’s blog.

  • Convert m4a to wav, but respect edit list ffmpeg [closed]

    4 février 2024, par user3413723

    I'm using ffmpeg to convert a m4a file to wav. The problem it the m4a file has an edts list that makes the audio start after a bit. I need this to be included so the wav is silent for that time. The audio has to be synced correctly. Any ideas ? I tried these :

    


    ffmpeg -i short.m4a  -acodec pcm_s16le -ac 1 -ar 16000 -use_editlist 1 out.wav

ffmpeg -i short.m4a  -acodec pcm_s16le -ac 1 -ar 16000 -advanced_editlist 0 out.wav


    


    no luck with either. Any ideas ? Here is the file

    


    https://drive.google.com/file/d/10x3QFjT_67ByfgXtiNFE1RlLAcwG68e5/view?usp=sharing

    


    Here is the debugger where you can see it adds time at the beginning. Just upload the m4a file and you can see the info about the audio track. You can also see it if you do ffprobe file.m4a like this :  Duration: 00:00:14.84, start: 0.167007, bitrate: 228 kb/s

    


    mp4 inspector :
https://gpac.github.io/mp4box.js/test/filereader.html

    


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