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• copy step written on stackoverflow to install FFMPEG on wamp not working

  18 novembre 2016, par user3833682

  I’m working on project for converting youtube videos into mp3 format and found this also to install ffmpeg on wamp server Install FFMPEG on WAMP and try other links also but ffmpeg extension is not installing so I also checked it at phpinfo to confirm its installed or not but not installed and I’ve windows 7 64, wampserver 2.4, apache 2.4.4 and php version is 5.4.12 I don’t know what am I missing, I spent my 6 hours to figure out but extension of ffmpeg is not installed yet please tell me what am I doing wrong ?

  Now after that I’m getting popup message twice when I start wamp server `PHP Startup : Unable to load dynamic library

  c :/wamp/bin/php/php5.4.12/ext/php_ffmpeg.dll’ - %1 is not a valid
  Win32 application.

  

• Segmenting .flac files with ffmpeg truncates audio but not file length

  5 avril 2022, par Yan White

  I am trying to get Twitter spaces audio (.ts) files into a format I can easily edit, on OSX.

  


  So far I was able to convert the files in bulk to .flac with this :

  


  for i in *.ts;
do name=`echo "$i" | cut -d'.' -f1`
echo "$name"
ffmpeg -i "$i" -sample_fmt s16 -ar 41000 "${name}.flac"
done


  


  That worked, and reduced the file sizes somewhat, but..
Because most of the files are around 7 hours long, my editor of choice cannot process that much audio in one file.

  


  So I looked around and was able to find this command to segment the files into 3hr long sections.

  


  ffmpeg -i space-1OdKrBealBqKX_0.flac -map 0 -f segment -segment_time 10800 -c copy space-1OdKrBealBqKX_0__%03d.flac


  


  This works, but each file contains as much empty / silent space at the end as the orginal file. That's going to be a problem for sharing with a team that will help edit these files, as each file has the original file's length and file size. There are a lot of files.
The audio segments and naming did work though.

  


  How to truncate the actual length of the file to the audio segment ?

  


  Caveat : I am no expert on any of these matters, I just managed to google and get this far, so if someone knows and wants to provide working code that would be very much appreciated !

  


• Hls.js record file

  28 février 2023, par Huhngut

  Hello and thanks for reading,

  


  I have a Hls stream with an m3u8 playlist.
The Video is playing just fine on an Html page with a Video element and https://github.com/video-dev/hls.js

  


  But if I download the segments to join them they are only white pixels. VLC and FFmpeg can't handle them. VLC shows a white pixel for 10seconds and FFmpeg says that there's no stream in the file.

  


  So now I want to know what this hls.js is doing to make it running. To me a non-js developer it all looks a bit confusing. I was able to understand stuff like which function is called when a new segment is loaded. Unfortunately, I was unable to understand stuff about the data. The one character variables are confusing to me.

  


  For now, I capture the stream of the video element and download it later but I don't like this solution at all.

  


  How to help me

  


  


  It would be very nice if anyone can tell me how to hook into the
script and tell it to download directly to the disk so I'm independent
of framerate drops.

  


  If anyone can tell how the script is able to convert the data so that
the element can use it and I would be able to implement or do
it with FFmpeg would be really helpful.

  


  I also thought it might be possible to have a listener when the blob
changes to store its contents.

  


  


  Thanks for everyone helping. I'm trying to find a solution for too many hours now.