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• Qt6.4.1 QProcess cannot call external program FFmpeg [closed]

  21 décembre 2022, par Xingchen

  Based on the official Qt example, slightly modified to call the external ffmpeg.exe for transcoding operations

  


  QProcess *p = new QProcess(this);
QString program = "C:\\Users\\kyrio\\Documents\\Qt_Project\\build-test-Desktop_Qt_6_4_1_MinGW_64_bit-Debug\\debug";
QStringList arguments;
arguments << "ffmpeg" << "-i" << "C:\\Users\\kyrio\\Videos\\222.mp4" << "C:\\Users\\kyrio\\Videos\\223.mov";
p->start(program, arguments);


  


  Run no results, try a variety of writing methods also no results, get the output is empty, and no FFmpeg-related processes under the task manager
  
Try to call cmd, task manager can see the sub-processes under the new cmd.exe
  
command is fine, can be called in the terminal, but need to add ./or.
  
can be successfully run in the terminal

  


  Try prefixing arguments with.\or.\or./, still no response
  
Tried to get the exact path to the ffmpeg.exe file in the program string, still no response
  
I want to be able to successfully call ffmpeg.exe to achieve the video transcoding needs

  


  I have made the "program" exact to ffmpeg.exe and this is still unresponsive.No process, no errorString output.The output of exitCode is also absent.

  


  QString program = "C:\\Users\\kyrio\\Documents\\Qt_Project\\build-test-Desktop_Qt_6_4_1_MinGW_64_bit-Debug\\debug\\ffmpeg.exe";


  


  Running results

  


  I tried to start cmd and connected the errorOccurred signal, but there is no output, it is worth noting that the process cmd appears in the task manager
  
no output
task manager

  


• Creating a VOD ABR system with HLS

  19 juillet 2016, par Matteo

  I know this is a specific question but I’m new to this and have spent weeks trying to solve this problem.

  I’m creating a mobile app and need to have Video on Demand (VOD) live streaming. Right now I’m converting MP4 video files into HLS using FFMPEG and broadcasting from a server but the load time is pretty long for 3G connections (low bandwith).

  Has anyone else set up this type of system that can help ?

  It looks like I need Adaptive Bitrate Streaming (ABR) and a media server with a CDN.

  My question is - #1 - Can I get away with not using a CDN ? Or perhaps not using a "media server" but just a regular server

  2 - Is it practical to use FFPMEG to set up an ABR stream with HLS

  I know I probably wont get a response to this question but I thought it was worth a shot.

  Thanks

• FFProbe not sending custom Headers

  3 février 2017, par Aiden901223

  I am trying to use FFprobe with a custom header that enables me to access the multimedia information such as frame-rate, bit-rates and etc of an URL. Custom Headers (-headers) were set based on the ffmpeg documentation and tutorials examples.

  Command snippet :

  ffprobe -headers $'X-CloudFront-Secret: A-VALID-TOKEN' -v error -show_format -show_streams -print_format json -i "URL"

  It returns a 403 Forbidden message.

  cURL-ing the URL with the custom header yields a 200 Response.

  Am I setting the ffprobe custom header right ?

  Thank you !