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• fluent-ffmpeg is having trouble setting creation_time (metadata) for mp4 video

  26 février 2023, par LycalopX

  So, basically, I have 2000 photos/videos that are, incorrectly, saved with random creation dates, and I wish to try and organize them. And, the solution I found was : getting the correct time through their name (they are already all named correctly), in the following format :

  


  YYMMDD HH:MM:SS
  

  


  That way, as I didn't want to go one by one writing all of the correct timestamps, I tried to change the metadata for all the files using javascript, and chose Fluent-FFMPeg for the job. I have ffmpeg installed on my computer, and I can successfully change the date of an MP4 file using the following command, in Windows Powershell (for that mp4 video) :

  


  ffmpeg -i 20150408_143303.mp4 -metadata creation_time="2015-05-08T17:33:03.000Z" newFile.mp4

  

  


  But, the code I wrote doesn't seem to work, at least to change the date of the file. I tested most of the metadata fields (author, title, etc.), and it seems to work fine with them, just not the Media Creation Date (creation_time).

  


  Here is the code, for reference :

  


      // node-module
    var ffmpeg = require('fluent-ffmpeg');

    // File location
    const filePath = './'
    var fileName = "20150408_143303.mp4"


    var year = fileName.slice(0, 4)
    var month = fileName.slice(4, 6)
    var day = fileName.slice(6, 8)
    var hours = fileName.slice(9, 11)
    var minutes = fileName.slice(11, 13)
    var seconds = fileName.slice(13, 15)

    var date = new Date(year, month, day, hours, minutes, seconds)

    //2015-05-08T17:33:03.000Z
    console.log(date)


    // First try (doesn't work)
    const file = filePath + fileName
    ffmpeg(file).inputOptions(`-metadata`, `title="Movie"`)


    // ffmpeg -i 20150408_143303.mp4 -metadata creation_time="2015-05-08T17:33:03.000Z" newFile.mp4

    // second try
    ffmpeg.ffprobe(file, function(err, metadata) {

        ffmpeg(file)
        .inputFormat('mp4')
        .outputOptions([`-metadata`, `creation_time=${date}`])
        .save('newFile.mp4')
        .on("progress", function(progress) {
            console.log("Processing: " + progress.timemark);
          })
          .on("error", function(err, stdout, stderr) {
            console.log("Cannot process video: " + err.message);
          })
          .on("end", function(stdout, stderr) {
            console.log((metadata.format.tags))
          })
        .run();

    })


  


  Console.log : https://imgur.com/a/gR93xLE

  There are no console errors, and everything seems to run smoothly, but the creation_time really does not change. Any idea as to why this is occurring is very welcome...

  


• How to concatenate the ts files with ffmpeg and python and keep the silence between the video fragments

  2 mai 2022, par shapale

  Using python and ffmpeg, I'm attempting to generate a video using photos and audio files.
There should be 1 second of silence between each video fragment. I'm adding one second to the real duration of the audio to create the silence. To do that I use ffprobe to acquire the audio length. All of the fragment videos are produced in the expected manner. After that, I convert them to ts fragments and concatenate all of the ts fragments I've made. The problem is that the silence I added at the end of each video fragment is removed in the final video, and the final video silence is added at the end (approx 5 sec). How can I ensure that each video fragment remains silent during concatenation ?

  


  
from subprocess import call, check_output
import os

FFMPEG_NAME = 'ffmpeg'

def ffmpeg_call(image_path, audio_path, temp_path, i):
    out_path_mp4 = os.path.join(temp_path, f'frame_{i}.mp4')
    out_path_ts = os.path.join(temp_path, f'frame_{i}.ts')
    audio_duration = str(float(check_output(['ffprobe', '-v', 'error', '-show_entries', 'format=duration', '-of', 'default=noprint_wrappers=1:nokey=1', audio_path]).decode('utf-8')) + 1)
    call([FFMPEG_NAME, '-loop', '1', '-y', '-i', image_path, '-i', audio_path,
          '-c:v', 'libx264', '-c:a', 'aac',
          '-b:a', '192k', '-vf', 'crop=trunc(iw/2)*2:trunc(ih/2)*2', '-shortest', '-t', audio_duration, out_path_mp4])
    call([FFMPEG_NAME, '-y', '-i', out_path_mp4, '-c', 'copy',
          '-bsf:v', 'h264_mp4toannexb', '-f', 'mpegts', out_path_ts])


def ffmpeg_concat(video_list_str, out_path):
    call([FFMPEG_NAME, '-y', '-f', 'mpegts', '-i', f'{video_list_str}',
          '-c', 'copy', '-bsf:a', 'aac_adtstoasc', out_path])

def create_video(temp_dir_path, audio_paths_list):
    image_name = 'image_3.jpg'
    output_path = os.path.join(temp_dir_path, 'main.mp4')
    for idx, audio_path in enumerate(audio_paths_list):
        image_path = os.path.join(temp_dir_path, image_name)
        audio_path = os.path.join(temp_dir_path, audio_path)
        ffmpeg_call(image_path, audio_path, temp_dir_path, idx)

    video_list = [os.path.join(temp_dir_path, f'frame_{i}.ts') \
                  for i in range(len(audio_paths_list))]
    video_list_str = 'concat:' + '|'.join(video_list)
    ffmpeg_concat(video_list_str, output_path)



def main():
    temp_dir_path = '/var/folder/1'
    audio_list = ['audio1.mp3', 'audio2.mp3', 'audio3.mp3']
    create_video(temp_dir_path, audio_list)
    print('finished')


if __name__ == '__main__':
    main()


  


• How to add a Poster Frame to an MP4 video by timecode ?

  25 mai 2020, par Crissov

  The mvhd atom or box of the original Quicktime MOV format supports a poster time variable for a timecode to use as a poster frame that can be used in preview scenarios as a thumbnail image or cover picture. As far as I can tell, the ISOBMFF-based MP4 format (.m4v) has inherited this feature, but I cannot find a way to set it using FFmpeg or MP4box or similar cross-platform CLI software. Edit : Actually, neither ISOBMFF nor MP4 imports this feature from MOV. Is there any other way to achieve this, e.g. using something like HEIFʼs derived images with a thmb (see Amendment 2) role ?

  



  

  



  The original Apple Quicktime (Pro) editor did have a menu option for doing just that. (Apple Compressor and Photos could do it, too).

  



  

  



  To be clear, I do not want to attach a separate image file, which could possibly be a screenshot grabbed from a movie still, as a separate track to the multimedia container. I know how to do that :

  



  

  • Stackoverflow #54717175

  


  • Superuser #597945

  


  



  I also know that some people used to copy the designated poster frame from its original position to the very first frame, but many automatically generated previews use a later time index, e.g. from 10 seconds, 30 seconds, 10% or 50% into the video stream.