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• Youtube DASH stream through to iOS format

  29 juillet 2014, par viperfx

  I have a stream link of a DASH codec format audio file using youtube-dl. It plays fine in the browser but on iOS the DASH codec is not supported. I am wondering how I can use ffmpeg to transcode the HTTPS stream live and then resend it out an AAC encoded m4a file or something that the iOS SDK supports through streaming - mp3 also works. I think using something such as nginx as the middleware inbetween would be a good idea. I can use python app to receive the request /videoID, it would grab the stream link and transcode it live feed it to nginx which would serve the correctly transcoded format back to the iOS app.

  Does anyone have any suggestions/ideas on how to achieve this ? I am stuck on the details on the ffmpeg bit.

• FFMPEG Subtitle Burning - Make Them Look Like Youtube Captions

  21 septembre 2016, par Spencer

  I want to burn subtitles into videos and make them look as close to the YouTube captions as possible. I’ve gotten pretty close with the following :

  ffmpeg -i VIDEOFILE.mkv -vf subtitles="f=SUBSFILE.vtt:force_style='FontName=Arial,FontSize=14,OutlineColour=&H55000000,BorderStyle=3,WrapStyle=2'" -y ENCODED-WITH-SUBS.mp4

  1. The major thing I want to fix in the above command is that when there are multiple lines, the backgrounds overlap.

  

  If you look at captions on YouTube there is always a nice small amount of space between the backgrounds.

  

  2. The second thing I’d like to do is make the corners of the backgrounds rounded if possible.

  I’ve looked through the documentation but I’m hoping I missed something. Thanks for any suggestions !

• I can no longer convert an mp4 video that is downloaded from YouTube to .wav file using ffmpeg [closed]

  25 juillet 2024, par user3288051

  I can no longer convert an mp4 video that is downloaded from YouTube to .wav file using ffmpeg.

  


  Here is the command I am using :

  


  video_name = "my_video_file"
dir_name = "experiment/john_doe/"

command = f'ffmpeg -i {dir_name}{video_name}.mp4 -ab 160k -ar 44100 -vn {dir_name}{video_name}.wav'

try:
    subprocess.check_call(command, shell=True)
except Exception as ex:
    print("Error: " + str(ex))


  


  Unfortunately, I get the following error :

  


  


  Output #0, wav, to 'experiment/john_doe/my_video_file.wav' : [out#0/wav
@ 0x1526131c0] Output file does not contain any stream Error opening
output file experiment/john_doe/James_Murphy2.wav. Error opening
output files : Invalid argument Error : Command 'ffmpeg -i
experiment/john_doe/my_video_file.mp4 -ab 192k -ac 2
experiment/john_doe/my_video_file.wav' returned non-zero exit status
234.

  


  


  Did YouTube change its codec ?

  


  Here is my video file in case you would like to give it a try. I downloaded it from my own YouTube channel (my own video).

  


  I would appreciate your help.