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• Set some audio stream properties in the vivo demuxer.

  4 décembre 2012, par Carl Eugen Hoyos

  Set some audio stream properties in the vivo demuxer.

• Julia FFMPEG string not recognizing format specifier

  12 janvier 2024, par veryverde

  I have this code :

  


  using Pkg
#Pkg.add("FFMPEG")
using FFMPEG

imagesdirectory = "my/paths/images"
framerate = 30
gifname = "my/paths/images/my-animation-name.gif"
FFMPEG.ffmpeg_exe(`-framerate $(framerate) -f image2 -i $(imagesdirectory)/%07d.png -y $(gifname)`)


  


  This code is taken from here
In it, FFMPEG is supposed to match those files that have 7 digits, which is what the %07d . That is, of the format 0000123.png, for example.

  


  This is, for whatever reason, not parsing it correctly, and reading the string directly :

  


  [image2 @ 0x7fc9fb00a000] Could find no file with path '/my/paths/images/%07d.png' and index in the range 0-4
/my/paths/images/%07d.png: No such file or directory


  


  I am not sure how to input this matching so that it is read properly, i.e., so that it matches all those files with exactly 7 digits, and a .png extension. For others, from the source of the code, it seems to be working, but I have no idea why it would parse it incorrectly. I've downloaded FFMPEG specifically for this task, so it ought to be up-to-date.

  


• How to Download YouTube Videos in 1080p with English Subtitles Using yt-dlp with Python 3

  30 juillet 2024, par edge selcuk

  I am trying to download YouTube videos using yt-dlp in Python 3.9. I want to download videos in 1080p quality and if 1080p is not available, it should download the best available quality. The audio and video files should be merged into a single MP4 file, and I have ffmpeg installed to handle the merging process.

  


  Here is my script :

  


  import os
import sys
from yt_dlp import YoutubeDL

def download_video(url):
    output_dir = r"/path"  # Update this path

    # Ensure the output directory exists
    if not os.path.exists(output_dir):
        os.makedirs(output_dir)
    
    ydl_opts = {
        'format': '(bestvideo[height<=1080][ext=mp4]/bestvideo)+bestaudio/best',
        'merge_output_format': 'mp4',
        'write_auto_sub': True,
        'writesubtitles': True,
        'subtitleslangs': ['en'],
        'subtitlesformat': 'vtt',
        'embedsubtitles': True,
        'outtmpl': os.path.join(output_dir, '%(title)s.%(ext)s'),
        'postprocessors': [{
            'key': 'FFmpegVideoConvertor',
            'preferedformat': 'mp4',
        }],
    }

    with YoutubeDL(ydl_opts) as ydl:
        ydl.download([url])

if __name__ == "__main__":
    if len(sys.argv) != 2:
        print("Usage: python download_video.py ")
        sys.exit(1)

    youtube_url = sys.argv[1]
    download_video(youtube_url)


  


  This script successfully downloads the video in 1080p quality or the best available quality and merges the audio and video files as intended. However, it does not download the subtitles as intended.

  


  I have ffmpeg installed for merging the video and audio files. How can I modify this script to ensure that English subtitles are downloaded and embedded in the video file ?