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• 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.

• 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

• MP4 libx264 converted to libx265 results in skipped frames

  5 mai 2023, par RGC

  FFmpeg 5-1-2-full_build on Windows10 and storage on windows server 2016.
We have about 1.5 TB data in videos as evidence to document compliance to manufacturing standards.
In a PowerShell batch script I move an libx264 mp4 to a USB3 backup location and then convert it back to the server location it came from :
FFMpeg -i backup\inputFile.mp4 c:v libx265 \server\outputFile.mp4 -n
in order to save much needed space on our server.
It did create a significantly smaller file, but while reviewing the results the length in time is the same as the input but frames seems like they were dropped.

  


  I am stumped as to use what additional parameters as ffmpeg has so many.
Can the fact that it does the conversion over a network to the server be an influence, or the input coming from a USB3 backup drive ?

  


  Thanks for your feedback,
RGC

  


  $noOfFiles++                            # count progress   
$serverMp4 = "$serverLine"          # Server MP4 input address

# Before Conversion grab MP4 from server and move to backup drive
# First grab input file path name and add as destination path, if not exist
$backupMp4 = $serverMp4.Substring(2)
$backupMp4 = "E:\Videos$backupMp4"
$serverLastFolder = (Split-Path $serverLine -Parent)
$serverLastFolder = (Split-Path $serverLastFolder -NoQualifier)
$destinationPath = Join-Path $destinationFolder $serverLastFolder
if(!(Test-Path $destinationPath)) {
    New-Item -ItemType Directory -Path $destinationPath
}

Move-Item -Path $serverMp4 -Destination $destinationPath

$myTime = get-date -format "yyyy-MM-dd HH:mm:ss"        # log Move
$msgOut = "$myTime Moved $serverMp4  to E:\Videos\"
Add-Content -Path $log -Value $msgOut        # store msg in log file
Write-Host $msgOut

# Convert file back to server
ffmpeg -i  $backupMp4 -c:v libx265 $serverMp4 -n

$myTime = get-date -format "yyyy-MM-dd HH:mm:ss"
$msgOut = "$myTime Converted $backupMp4 `n $arrow      $serverMp4"
Write-Host $msgOut                           # Console msg
Add-Content -Path $log -Value $msgOut        # store msg in log file

Write-Host "Completed Move of: $noOfFiles `n $sepLine" -ForegroundColor DarkYellow

# Finished Move of MP4 file to Backup Drive and Converted back to original location. 
# Grab next line  


  


  }