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• Getting a screenshot from a protected m3u8 live stream using FFmpeg

  19 octobre 2022, par Matej Petrovski

  I am trying to get a screenshot from a local pay-toll in order to use image recognition to find out how congested it is. I am trying to use ffmpeg to extract a screenshot every time a command is run from AWS Lambda. My issue is that I cannot extract any sort of image from the m3u8 file.

  


  http://roads.mk/315/video-kameri

  


  When I open one of the cameras, the live stream appears as normal, but when I right-click to copy the address, i get a blob link

  


  blob :http://roads.mk/cb301be0-3e70-4d09-af2b-3f3d44ee8f4f

  


  Luckily, on the mobile version of the site, it immediately downloads the m3u8 file once the link is clicked. Once put into ffmpeg with command

  


  ffmpeg -i "gradsko_1.m3u8" -vf fps=1/3600 grad%04d.jpg

  


  I get the response

  


  
[hls @ 000000ce3d26d700] Skip ('#EXT-X-VERSION:3')
[hls @ 000000ce3d26d700] Opening 'gradsko_1-586008.ts' for reading
[hls @ 000000ce3d26d700] Failed to open segment 586008 of playlist 0
[hls @ 000000ce3d26d700] Opening 'gradsko_1-586009.ts' for reading
[hls @ 000000ce3d26d700] Failed to open segment 586009 of playlist 0
[hls @ 000000ce3d26d700] Opening 'gradsko_1-586010.ts' for reading
[hls @ 000000ce3d26d700] Failed to open segment 586010 of playlist 0
[hls @ 000000ce3d26d700] Skip ('#EXT-X-VERSION:3')
    Last message repeated 3 times
[hls @ 000000ce3d26d700] Error when loading first segment 'gradsko_1-585991.ts'
gradsko_1.m3u8: Immediate exit requested
Exiting normally, received signal 2.```

From what I could tell, the stream seems to be protected. 
Any way to get inside this? I would only need a single screenshot with no audio since the program would run once an hour/on command for a very general estimate. I'm just starting out with ffmpeg so any tips would be greatly appreciated.


  


• Yes or no, will ffmpeg api do hardware decoding on iOS ?

  15 janvier 2019, par Fattie

  There seems to be conflicting information on this.

  https://trac.ffmpeg.org/wiki/HWAccelIntro

  notice the first diagram, it firmly marks iOS as “Y” on VideoToolbox

  

  however in the comments down the bottom it says

  VideoToolbox. ​VideoToolbox, only supported on macOS. H.264 decoding is available in FFmpeg/libavcodec.

  And in the confusing second diagram it says "Standalone" is not done for VideoToolbox.

  We have found that using ffmpeg compiled in to iOS .... it seems to not use hardware decoding, which is really a pain.

  1. With avcodec_get_hw_config() we get AV_PIX_FMT_VIDEOTOOLBOX, AV_HWDEVICE_TYPE_VIDEOTOOLBOX which is seemingly correct.

  2. But usage and framerates clearly shows everything is being done in CPU. The code is in ff_hevc_hls_residual_coding all the time. (That’s fffmpeg’s software decoder.)

  3. This very diff very long git.videolan.org URL here seems to suggest again it should all be working.

  4. Have tried every iPhone etc. of course

• sh : ffmpeg : command not found when run command through php

  9 avril 2015, par Ashok

  I have installed successfully installed FFMpeg on root of my Centos 6 machine (https://trac.ffmpeg.org/wiki/CompilationGuide/Centos).

  My workplace of apache/php is /var/www/html

  Now I’m running below command successfully on /var/www/html directory to capture frame from the video file. It’s capturing a frame.

  [root@localhost html]# ffmpeg -i video.mpg -an -ss 30  -t 00:00:01 -r 1 -y -vcodec mjpeg -f mjpeg -s 160x100 frame8  2>&1

  I want to run this command through php and using shell_exec() or exec() php functions. My php code for running the command is :

  $cmd = "/root/bin/ffmpeg -i /project/app/webroot/videos/video.mpg -ss 00:00:14.435 -f image2 -vframes 1 /project/app/webroot/videothumbnails/example-thumb.jpg";
  
  $locale = 'en_IN.UTF-8';
  
  setlocale(LC_ALL, $locale);
  
  putenv('LC_ALL='.$locale);
  
  echo shell_exec($cmd);

  When I’m trying to run command through above php code, I’m getting below error :

  sh: ffmpeg: command not found

  Please help me to solve out this problem.