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• Live streaming to YouTube over HLS with FFMPEG [closed]

  19 septembre 2022, par Ash Raj

  When I stream my FaceTime camera to YouTube over HLS, my video freezes every couple seconds. Which settings do I have wrong, or am missing ?

  


  ffmpeg \
-f avfoundation \
-framerate 30 \
-video_size 1920x1080 \
-pixel_format yuyv422 \
-probesize 10M \
-i "0:0" \
-c:v hevc_videotoolbox \
-b:v 4500K \
-tag:v hvc1 \
-c:a aac \
-method POST \
-f hls \
"https://a.upload.youtube.com/http_upload_hls?cid=STREAM_KEY&copy=0&file=index.m3u8"


  


  I'm troubleshooting this with my FaceTime camera right now, but I plan on using a capture card with a 4K studio camera after I get this working

  


• Download youtube video duration using youtube-dl PHP and ffmpeg

  21 juin 2017, par user3285828

  Is there any more efficient way to download youtube videos at a specific start and end time using youtube-dl and ffmpeg in PHP.

  I currently have this, which does work, it first downloads the whole video to an mp3 file, and then crops that file to the range I set using ffmpeg, but when I only want 30 seconds or so of a 20 minute video, waiting for the full video to download doesn’t seem the best way to do it.

  <?php
  
  require __DIR__ . '/vendor/autoload.php';
  
  
  
  use YoutubeDl\YoutubeDl;
  
  
  
  $dl = new YoutubeDl([
  
      'extract-audio' => true,
  
      'audio-format' => 'mp3',
  
      'audio-quality' => 0, // best
  
      'output' => 'videoname.%(ext)s',
  
  ]);
  
  $dl->setDownloadPath('C:\youtubevideos');
  
  $video = $dl->download('https://www.youtube.com/watch?v=oDAw7vW7H0c');
  
  
  
  $start = 60; // Start 60 seconds in to the video
  
  $duration = 30; // Get 30 seconds after $start
  
  $fullVideo = "C:\youtubevideos\videoname.mp3";
  
  $shortVideo = "C:\youtubevideos\short\shortversion.mp3"; // create 30 seconds
  
  exec("ffmpeg -ss $start -i $fullVideo -t $duration -c copy $shortVideo");
  
  exec("DEL $fullVideo");

  I am using youtube dl PHP https://github.com/norkunas/youtube-dl-php

• Why does Youtube player stretch MPEG1/2 video not H.264 ?

  25 juin 2017, par Maru

  I want to upload the video on Youtube and I have this particular MKV file.

  

  and I used ffmpeg to convert it to MP4 and hard code the ass subtitle into it.

  Now my question is

  When I simply tried converting the video without a sub and uploaded on Youtube,
  so it retained its original vcodec.

  ffmpeg -i "input.mkv" -c:v copy -c:a aac "output.mp4"

  The video (vcodec MPEG-1/2) is played with 16:9 ratio.

  However, when I put a sub on it, so the video need to be re-encoded.
  (In this case, I chose to preserve the quality by making it lossless.)

  ffmpeg -i "input.mkv" -preset veryslow -crf 0 -c:a aac -vf "ass=sub.ass" "output.mp4"

  Now the subbed video has vcodec of H.264.

  However, Youtube player keep its original aspect of 720x480 and there is a black bar on the side of the video.

  Therefore, I am curious why is it such a case ? even though VLC told me that both has the same resolution of 720x480.

  Furthermore, is there anyway I can adjust the aspect ratio on Youtube ?

  I know that I can simply scale the video with ffmpeg,

  but I was wondering if there is anyway I can tell Youtube to play the aspect ration that I want ? I think the formatting tags no longer works....