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• ffmpeg downloading parts of Youtube videos but for some of them they have a black screen for a few seconds

  29 septembre 2021, par user14702793

  So im using ffmpeg to download some youtube videos with specific start and stop times. My code looks like os.system("ffmpeg -i $(youtube-dl --no-check-certificate -f 18 --get-url %s) -ss %s -to %s -c:v copy -c:a copy %s"% (l, y, z, w)) where the variables would all be the name of the file, the url, and the start and stop times. Some of the vidoes come out just fine, others have a black screen and only a portion of the video, and a very few amount have just audio files. My time is formated as x.y where x would be the seconds and y would be the milliseconds. Is this the issue so I need to transform it to 00:00:00.0 format ? Any help is appreciated

  


• 403 Forbidden ffmpeg / youtube-dl

  28 février 2023, par TSR

  I am trying to download a blob video that is playing in my browser :

  


   ffmpeg -i 'https://example.com/playlist.m3u8?cred=abcd' -bsf:a aac_adtstoasc \              
    -vcodec copy -c copy -crf 50 file.mp4


  


  I get the error

  


  


  https @ 0x11fe2ade0] HTTP error 403 Forbidden [hls @ 0x11fe05610]
Failed to open an initialization section in playlist 0
Error when loading first segment
'https://example.com/s2q1.m4s' ;

  


  


  Indeed, when I open https://example.com/s2q1.m4s I get 403 forbidden in browser. However, if I add https://example.com/s2q1.m4s?cred=abcd , I get no error.

  


  I get the same behaviour with youtube-dl

  


  So how to make ffmpeg or youtube-dl append whatever query parameter in the input url in all subsequent requests ?

  


• How to livestream a webcam to YouTube with FFmpeg ?

  6 juillet 2023, par pkok

  I want to send the livestream of my webcam to YouTube. I can follow YouTube's guide up to step 8. "Stream Connection" tells me there is "No data" and the button "Go Live" remains unclickable. A screenshot of this situation can be seen at

  



  

  



  As encoding software, I was planning on using FFmpeg because it can run from the target platform, a Raspberry Pi with Raspbian. A USB webcam supported by video4linux2 is used.

  



  FFmpeg's wiki shows that streaming a file can be done with the following :

  



  ffmpeg -re -i input.mkv \&#xA;-c:v libx264 -preset veryfast -maxrate 3000k \&#xA;-bufsize 6000k -pix_fmt yuv420p -g 50 -c:a aac -b:a 160k -ac 2 \&#xA;-ar 44100 -f flv rtmp://live.twitch.tv/app/<stream key="key">&#xA;</stream>

  



  I modified this command in the following ways :
1. It takes the video stream from the webcam with -f v4l2 -i /dev/video0.
2. It does not broadcast any audio with -an.
3. It broadcasts to YouTube's RTMP server, rtmp://a.rtmp.youtube.com/live2/<stream key="key"></stream>

  



  The final version of the command is now :

  



  RTMP_URL="rtmp://a.rtmp.youtube.com/live2"
STREAM_KEY="secr-etse-cret-secr"
OUTPUT=$RTMP_URL/$STREAM_KEY
ffmpeg -re -f v4l2 -i /dev/video0 \
-c:v libx264 -preset veryfast -maxrate 3000k \
-bufsize 6000k -pix_fmt yuv420p -g 50 -an \
-f flv $OUTPUT


  



  When I run this command, I would expect that "Stream connection" would change to something else than "No data" after a few seconds, but that does not happen.

  



  I have tried recording the stream to a local file with :

  



  ffmpeg -re -f v4l2 -i /dev/video0 \
-c:v libx264 -preset veryfast -maxrate 3000k \
-bufsize 6000k -pix_fmt yuv420p -g 50 -an \
-f flv test.flv


  



  This worked fine. That demonstrates to me that the issue is with getting the video stream accepted by YouTube.