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• PHP add whitespaces in string with an URL

  25 juin 2021, par Alberto Valerio

  Problem

  


  I have a temporary url to access an object from AWS-S3

  


  $source = "http://mybucket...";


  


  If I do a var_dump($source) it shows me the correct URL

  


  string(407) "https://mybucket.s3.amazonaws.com/storage/..."


  


  So I try to use this url in a ffmpeg command in this way (double quotes are required in ffmpeg)

  


  $cmd = 'ffmpeg -i "' . $source . '" ...
shell_exec($cmd);


  


  This do not work, and when I do a var_dump($cmd) the url shows like this (whitespace beetween https: and the // )

  


   "https: //mybucket.s3.amazonaws.com/storage/..."


  


  It works fine when I specify the url with the S3 protocol

  


  "s3://mybucket...."


  


  So maybe the problem is with the https protocol

  


  What I tried(It didn't work)

  


  

  • I tried $url = str_replace(' ', '', $source);

  


  • I tried $url = str_replace('%20', '', $source);

  


  • I tried $url = str_replace('https: //', 'https://', $source);

  


  • I tried $url = preg_replace("/\s+/", "", $source);

  


  • I tried addslashes($source) instead '"' . $source . '"'

  


  • I tried $url = escapeshellarg($source);

  


  


  What I'm using

  


  

  • Php 7

  


  • Laravel 4

  


  • AWS-S3

  


  


• Display a specific string in each frame with ffmpeg

  22 septembre 2020, par Robyc

  I'm creating a video from a set of images like this

  


      ffmpeg -f concat -safe 0 -r 1 -i video_file.txt -crf 0 video_file.mkv


  


  where video_file.txt contains the filepath of the images, which looks like this :

  


      file '/path/to/image1.tif'
    duration 0.5
    file_packet_metadata name=image1_name
    file '/path/to/image2.tif'
    duration 0.5
    file_packet_metadata name=image2_name
    ...


  


  Concat reads all the lines starting with file '...' and correctly creates the output video.

  


  I want that for each frame a specific string appears on screen, e.g. the filename or part of it.

  


  I tried different options but none worked :

  


  

  1. adding -vf drawtext=textfile='path/to/frame.txt to the ffmpeg command

     

     • where frame.txt contains in each line the text I want for each frame.

     


     • This fails because the entire text in the file is displayed over each frame.

     


     


  


  2. adding -vf drawtext=text=%{metadata\\:name} to read the metadata name=image1_name in video_file.txt source here

     

     • this simply displays the string 'name' in the output

     


     • I tried metadata\:name, metadata:name, and metadata:name

     


     


  


  


  How can I display a specific string for each frame ?

  


• avformat/dashdec : Fix leak of string on error when parsing representation

  19 septembre 2020, par Andreas Rheinhardt

  avformat/dashdec : Fix leak of string on error when parsing representation
  The DASH demuxer currently extracts several strings at once from an xml
  
  document before processing them one by one ; these strings are allocated,
  
  stored in local variables and need to be freed by the demuxer itself.
  
  So if an error happens when processing one of them, all strings need to
  
  be freed before returning. This has simply not been done, leading to
  
  leaks.
  A simple fix would be to add the necessary code for freeing ; yet there is
  
  a better solution : Avoid having several strings at the same time by
  
  extracting a string, processing it and immediately freeing it. That way
  
  one only has to free at most one string on error.
  Reviewed-by : Steven Liu <lq@chinaffmpeg.org>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/dashdec.c