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• use ffmpeg to set start_time equal in audio and video elementary streams

  13 août 2018, par sajad

  I am using ffmpeg tool for offline transcoding of some input files to MPEG-TS format. I use ffprobe to analyze the output. I need the output video to have equal values for start_time for both video and audio elementary streams. This is necessary for streaming by Perception streamer server. My desired output is like this :

  <streams>        
  
      <stream index="0"></stream>..../ codec_type="video" /.../ start_pts="YYY" start_time="XXX" /..../
  
          
  
          <stream index="1"></stream>..../ codec_type="audio" /.../ start_pts="YYY" start_time="XXX" /..../
  
          
  
      </streams>

  I use this profile for transcoding :

  -ss 0 -y -vcodec libx264 -vb 3404k -acodec libfdk_aac -profile:a aac_he -strict experimental -ar 48k -f adts -ab 96k -r 25 -g 50 -force_key_frames 'expr:gte(t,n_forced*2)' -x264-params keyint=50:min-keyint=50:scenecut=-1:force-cfr=1:nal-hrd=cbr -vsync 1 -async 1 -profile:v main -level 4.0 -s 1920x1080 -aspect 16:9 -avoid_negative_ts make_zero -strict experimental -muxdelay 0 -muxpreload 0 -output_ts_offset 0 -initial_offset 0 -start_at_zero -bufsize 3500K -minrate 3500K -maxrate 3500K -f mpegts

  How can I set start_time and start_pts like I explained ?

• Solution Merge mp3+mp4 together with FFMPEG or other

  7 juin 2018, par SandyUgale

  I have been working on a project where I have .mp3 and video file (.MP4). I have FFMG on my AWS server and I’m providing both to FFMPEG give me complete video file with provided audio file. Then I send this file to my AWS S3 and then fetch this video as needed in my web app.

  Problem/Use Case :

  If I have 10 mp3 and 10 mp4 video files then I have to wait the until it complete all videos then only I can send them on S3, so Im waiting for long as number goes up.

  Can I control this ?

  Solution-1 : Don’t need to wait for loop

  Meaning instead of starting all merging together parallel I would like merging to be done one by one. Referencing above example

  First merge of 1.mp3 + 1. Mp4= 1.mp4 (complete file) –upload s3.  
  
  Second merge of 2.mp3 + 2. Mp4= 2.mp4 (complete file) –upload s3.  
  
  Tenth merge of 10.mp3 + 10. Mp4= 10.mp4 (complete file) –upload s3.  

  Solution-2 : send video as they ready

  How I can know which video has been ready to send to s3 ?

  Solution-3 : other service

  Is there any other online API or services where I can pass mp3 + mp4 and give me video url simply after merging so technically video will hosted on either their platform or on my S3 doest matter.

• How to process a video's equal parts concurrently in Python

  5 mai 2020, par ikonuk

  There is a video file and four equally divided parts with FFMPEG but i want to process video without cutting them with FFMPEG to be more dynamic. I just want to logically divide a video and send them to p.map() function without everytime creating video parts in my project file.
Here is my code ;

  



  ...
if __name__ == '__main__':
    with Pool(4) as p:
        p.map( function , ['video-0.mp4','video-1.mp4','video-2.mp4','video-3.mp4' ])

def function(video):
    camera = cv2.VideoCapture(video)
    ...


  



  Is it possible to send equally determined parts to this function without cutting them ?