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• change OpenCV to ffmpeg

  2 octobre 2020, par beast

  I am using earthcam links for data collection purposes. My implementation works perfectly fine on local but gives me an OpenCV: image broken error on CentOS 7 system. As ffmpeg is used in the background for OpenCV, I want to directly use ffmpeg to read m3u8 file retrieved from streamlink in the following way.

  


  streams = streamlink.streams(stream_link)
q = list(streams.keys())[0]
stream = streams['%s' % q]
video_cap = cv2.VideoCapture(stream.url) ----> # Want to change this line to ffmpeg


  


  An example link that I am using in my problem is - Nyc_5th_Street

  


  Also, In addition, I just need the first frame of the m3u8 file every time I loop it in.

  


• ffmpeg.c what are pts and dts ? what does this code block do in ffmpeg.c ?

  19 février 2014, par Aditya P
  • In simple terms what are pts and dts values ?
  • Why are they important while transcoding [decode-encode] videos ?

  What does this code bit do in ffmpeg.c , what is its purpose ?

  01562    ist->next_pts = ist->pts = picture.best_effort_timestamp;
  
  01563    if (ist->st->codec->time_base.num != 0) {
  
  01564        int ticks= ist->st->parser ? ist->st->parser->repeat_pict+1 : ist->st->codec->ticks_per_frame;
  
  01565        ist->next_pts += ((int64_t)AV_TIME_BASE *
  
  01566                         ist->st->codec->time_base.num * ticks) /
  
  01567                         ist->st->codec->time_base.den;
  
  01568    }

• Batch reduce bitrate and size of mp3 audio files with ffmpeg

  27 mars 2024, par Wes Modes

  I was looking for a way to batch reduce mp3 bitrate on my sizable collection of mp3 files. It was surprising difficult given that this must be a super common thing to want to do.

  



  In fact, there are dozens, maybe hundreds, of posts from people asking how to do it, and dozens of utilities available for varying amounts of money that claim to do just that. Looking around and trying some of the free software, I was surprised that none made the task of batch converting/adjustment easy.

  



  If I wanted to convert a single file, I'm told this is a decent way to do it :

  



  ffmpeg -y -loglevel "error" -i "my_music_file.mp3" -acodec libmp3lame  -ab $BITRATE "my_music_file_new.mp3"


  



  (Though I'd prefer if the file was changed in place and resulted in the same name.)

  



  I need a simple bash script using ffmpeg that will recursively go through my music directory and change the bitrate of my mp3 files.