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• How to switch between audio streams added using ffmpeg on an iPhone ?

  24 décembre 2019, par Tony M

  I have an m.mp4 with English audio and want to add a second audio stream in Italian so that I can play either language using the iPhone. When I used this command :

  ffmpeg -i m.mp4 -i ita.mp3 -c copy -map 0 -map 1 out.mp4 

  The output from ffmpeg -i out.mp4 (see below) shows that a new audio stream is added, yet when I transfer the video to the TV app and play it on either MacOS or iOS it only plays the original English and I see no options to play other languages.

  How do I get it to be able to switch between either audio ?

  Here is the output from ffmpeg -i out.mp4:

      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 400x300 [SAR 1:1 DAR 4:3], q=2-31, 482 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 24k tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 102 kb/s (default)
  
      Metadata:
  
        handler_name    : SoundHandler
  
      Stream #0:2: Audio: mp3 (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 152 kb/s
  
      Metadata:
  
        encoder         : LAME3.100
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
    Stream #1:0 -> #0:2 (copy)

• Assign output of subprocess to variable

  21 juillet 2016, par Bryan

  The purpose of this script is to read a file, extract the audio, and print out a transcript by running it through IBM Watson speech to text API. My problem is when I try to save the output from the subprocess into a variable and pass it into the open function, it reads as binary. What am I doing wrong ? Any help would be appreciated !

  import sys
  
  import re 
  
  import json
  
  import requests
  
  import subprocess 
  
  from subprocess import Popen, PIPE
  
  
  
  fullVideo = sys.argv[1]
  
  title = re.findall('^([^.]*).*', fullVideo)
  
  title = str(title[0])
  
  output = subprocess.Popen('ffmpeg -i ' + fullVideo + ' -vn -ab 128k ' + title + '.flac', shell = True, stdin=subprocess.PIPE).communicate()[0]
  
  
  
  sfile= open(output, "rb")
  
  response = requests.post("https://stream.watsonplatform.net/speech-to-text/api/v1/recognize",
  
           auth=("USERNAME", "PASSWORD"),
  
           headers = {"content-type": "audio/flac"},
  
           data=sfile
  
           )
  
  
  
  print (json.loads(response.text))

• Adding 2 watermark with ffmpeg in different duration each one

  3 octobre 2014, par Paris Thiva

  i have a php code that i cut edit video with ffmpeg. now i can add one image as logo on video

  code is

  if(isset($_POST['video']))
  
          {
  
          $target=realpath(SAVEPATH);
  
          $watermark=WATERMARK;
  
          $ffmpeg=FFMPEG;
  
          $fromtime="00:00:0";
  
          $totime="00:05:00";
  
          $clip="-ss $fromtime -t $totime";
  
          $filter="[watermark]; [in][watermark] overlay=main_w-overlay_w-10:10 [out]";
  
  //      ob_start();
  
          foreach($_POST['video'] as $vid)
  
              {
  
              $filepath=UPLOADS."/$vid";
  
              $target_file="$target/$vid";
  
  //          passthru("sh xform.sh '$filepath' '$target' '$watermark' 2>&1");
  
              // 1. get the video width
  
              exec("$ffmpeg -i \"$filepath\"  2>&1 | perl -lane 'print $1 if /([0-9]{2,}x[0-9]+)/' | cut -d'x' -f1",$width);
  
              // 2. transform the video
  
              $swidth=$width[0]/3;
  
              $cmd="$ffmpeg -i \"$filepath\"  $clip -s $res -vf  \"movie=$watermark,  scale=$swidth:-1  $poss\" \"$target_file\" -vcodec h264 2>&1";
  
               exec($cmd,$output);
  
              echo "<center><label>Video Cut/Edit of $vid Done</label></center>";
  
              }

  how i can add one more image in deferent duration ?

  Thank you