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• Add a seconds counter text to a sliced video with ffmpeg that starts from 0

  16 mars 2024, par virtualdj

  I'm trying to convert a small part of a screen recording video into a GIF with ffmpeg. I would like to add a seconds counter on it as the frame rate of the GIF file is reduced, so I can guess the time passing from the counter.

  


  Normally, assuming to start at 43 seconds and cutting after 33 seconds, the example video would have been encoded to GIF with :

  


  ffmpeg -i in.mp4 -vf "scale=300:-1,fps=5,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" -ss 43 -t 33 out.gif


  


  To print the timecode, I add the following after fps=5, :

  


  drawtext=text='%{pts\:hms}':font='Arial':fontcolor=red:fontsize=14:x=(w-text_w)/2:y=(h-text_h-6),


  


  Doing so, prints a timecode on the output that starts from 00:00:43.000, not from zero. Similarly the timecode option :

  


  drawtext=text='':font='Arial':fontcolor=red:fontsize=14:x=(w-text_w)/2:y=(h-text_h-6):timecode='00\:00\:00\:00':timecode_rate=5,


  


  will ouput 00:00:43:0. There doesn't seem to have a way to use the "output" timecode (that starts from 0) ; also, I would like to have the seconds only.

  


  How can I do that ?

  


• Extract 5 seconds of a mp4 video for every 60 seconds of the video [duplicate]

  8 mars 2024, par transientflaw

  I'm trying to write a batch script with ffmpeg that takes every mp4 files in a folder, extracts 5 seconds out of them at 2 seconds after the start of the video, and then, if the original video lasts longer than 60 seconds, as well as that first segment, it takes another 5 seconds segment for every 60 seconds until it cannot because there are not enough seconds to segment.

  


  Is it clear ?

  


  I've tried this code

  


  @echo off

rem Set input and output directories
set "input_dir=C:\Users\Lex\Desktop\vtrip"
set "output_dir=C:\Users\Lex\Desktop\vtrip\output"

rem Loop through all MP4 files in the input directory
for %%I in ("%input_dir%\*.mp4") do (
    rem Extract 5 seconds starting 2 seconds after the start of the video
    ffmpeg -i "%%I" -ss 2 -t 5 "%output_dir%\temp_segment_1_%%~nI.mp4"

    rem Get total duration of the video
    for /f "tokens=*" %%a in ('ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 "%%I"') do set "duration=%%a"

    rem Check if the duration exceeds 60 seconds
    if !duration! GTR 60 (
        rem Calculate the number of segments
        set /a "num_segments=!duration!/62"
        
        rem Extract 5-second segments every 62 seconds
        set /a "start_time=64"  REM Start from 2 seconds after the first segment
        for /l %%x in (2,1,!num_segments!) do (
            ffmpeg -i "%%I" -ss !start_time! -t 5 "%output_dir%\temp_segment_%%x_%%~nI.mp4"
            set /a "start_time+=62"
        )
    )
)



  


  I've tried it on 3 files, the 2 that are under 1 minute are fine but there is one that lasts 2m29 and it only extracts 1 segment for that last one whereas it should extract 3 5-seconds segments for this one video.

  


  Any way to fix that ?

  


• Converting an audio file from .oga format to .mp3 using ffmpeg package on nodeJs produces a max of 3 seconds output file no matter the input duration

  15 janvier 2024, par JnrLouis

  I am downloading an audio file in .oga format and saving it. Then I am trying to convert the file to .mp3 format, but the issue is the output file is always truncated and a maximum of 3 seconds. I have gone through the fluent-ffmpeg library and I can't seem to find what I'm doing wrong.

  


  I have ffmpeg installed and I'm using the fluent-ffmpeg library. The downloaded .oga file doesn't seem to have any issues, the issue is after it gets converted to .mp3.

  


  I also tried converting to .wav, and I faced the same issue.

  


  Below is my current code :

  


  const fs = require("fs");
const ffmpegPath = require('@ffmpeg-installer/ffmpeg').path;
const ffmpeg = require('fluent-ffmpeg');
ffmpeg.setFfmpegPath(ffmpegPath);
const axios = require("axios");

const inputPath = __dirname + '/audio/input.oga';
const outputPath = __dirname + '/audio/output.mp3';

const saveVoiceMessage = async (url) => {
    try {
        const response = await axios({
            method: 'GET',
            url: url,
            responseType: 'stream'
        });
        const inStream = fs.createWriteStream(inputPath);
        await response.data.pipe(inStream);
    } catch (error) {
        console.error(error);
    }
}

const convertToMp3 = async () => {
    try {
        const outStream = fs.createWriteStream(outputPath);
        const inStream = fs.createReadStream(inputPath);
        // I also tried using the inputPath directly, still didn't work
        ffmpeg(inStream)
            .toFormat("mp3")
            .on('error', error => console.log(`Encoding Error: ${error.message}`))
            .on('exit', () => console.log('Audio recorder exited'))
            .on('close', () => console.log('Audio recorder closed'))
            .on('end', () => console.log('Audio Transcoding succeeded !'))
            .pipe(outStream, { end: true })
    } catch (error) {
        console.error(error);
    }
}

const saveAndConvertToMp3 = async (url) => {
    try {
        await saveVoiceMessage(url);
        await convertToMp3();
        }

    } catch (error) {
        console.error(error);
    }
}