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• Correct settings for streaming audio and video to YouTube

  27 novembre 2020, par Claus

  I'm using this script to stream an .mp4 video file with a sound track in .mp3 format :

  


  ffmpeg \
-re \
-i "$VIDEO_SOURCE" \
-thread_queue_size 512 \
-i "$AUDIO_SOURCE" \
-c:v libx264  -pix_fmt yuv420p -preset $QUAL -r $FPS -g $(($FPS *2)) -b:v $VBR \
-c:a $AUDIO_ENCODER -threads 6 -ar 44100 -b:a 128k -bufsize 512k -pix_fmt yuv420p \
-f flv $YOUTUBE_URL/$YOUTUBE_KEY


  


  the video gets displayed correctly on the channel but I cannot get any audio played.

  


  No error message on the console. What am I missing ?

  


• Streaming - How do you re-encode (fps, bit rate, codec) a live stream (e:g twitch/youtube) to another live stream ? [on hold]

  10 février 2017, par shayan

  For example I could receive a twitch 720p/60fps stream and encode it down to 360p/60fps for live viewing(hls preferably). I have used ffmpeg and youtube-dl for simple tasks but i don’t know how I can achieve this.

• 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 ?