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• PHP - How to track video conversion progress - Stop ffmpeg process in PHP web [closed]

  21 mai 2022, par Mursaleen Ahmad

  I am working on a PHP web project where multiple users will be able upload and convert their videos bitrate using ffmpeg. And if users go to watch page before full conversion then "Video is being processed" message should show up.
I am using jQuery with AJAX and a watch link generated to watch online.

  


  1) How can I find the process is still running and show "Video is being processed" message to the users ?

  


  2) How can I stop ffmpeg process ?

  


  3) How can I get conversion percentage (how much video is converted) from file (as multiple users are using the site so can't work on single file named output.txt) ?

  


• Streaming and Playing On-the-fly Converted AAC Audio in Qt 5.12.2 Using FFmpeg/LibAV

  17 novembre 2023, par Shlx

  I'm currently working on a Qt (5.12.2) project. I'm trying to play an audio file that is encoded as AAC but stored in an MPEG-4 container, making it unable to be played easily. The current idea is to use ffmpeg / libAV to convert the file on-the-fly when the user tries playing it. How is it possible to

  


  

  1. Stream the file as it is being converted, and

  


  2. Open the stream handle in a QMediaPlayer, playing the file ?

  


  


  I tried using ffmpeg on the command line to make an RTSP stream while converting, but couldn't get it working whatsoever. While fiddling around, I got a working RTP stream (no transcoding) using this command :

  


  ffmpeg -re -f mp3 -i test.mp3 -acodec libmp3lame -ab 128k -ac 2 -ar 44100 -f rtp rtp://127.0.0.1:1234


  


  Most examples I found online only address video streams. I also couldn't find a definitive answer if opening the stream would even be possible on my Qt version (not able to update).

  


  Cheers

  


• Merge audio (m4s) segments into one

  20 avril 2022, par akinuri

  I recently started learning Laravel, and currently watching an online course. Online courses are fine, but I like to have local copies, so I'm trying to download/merge segmented audio from Laracasts : Laravel 8 From Scratch series.

  


  I've written some scripts (in Python) that does the following :

  


  

  1. Download the master.json

  


  2. Read master.json and download audio segments

  


  3. Merge the segments into a single file (the file is not playable yet)

  


  4. Process the audio file via ffmpeg (now it's playable, but has issues)

  


  


  I think there's a problem with the step 3 and/or 4.

  


  In step/script 3, I create a new file, and add the contents of the segments to the file in binary.

  


  Then (step/script 4), run a ffmpeg command in python : ffmpeg -i merged-file.mp4 -c copy processed-file.mp4

  


  However, the final file doesn't work/play as expected. There's a delay in the beginning, and some parts seem to be cut off/skipped.

  


  There are three possibilities :

  


  

  • Segment files are problematic (not likely ?)

  


  • I'm doing the merging wrong

  


  • I'm doing the ffmpeg processing wrong

  


  


  Can someone guide me here ?

  


  ---

  


  The issues/colored parts in the ffmpeg output are :

  


  ...
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001cfbc0de780] could not find corresponding track id 2
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001cfbc0de780] could not find corresponding trex (id 2)
...
[aac @ 000001cfbc0f0380] Number of bands (31) exceeds limit (6).
...
[mp4 @ 000001cfbc20ecc0] track 0: codec frame size is not set
...
[mp4 @ 000001cfbc20ecc0] Non-monotonous DTS in output stream 0:0; previous: 318318, current: 286286; changing to 318319. This may result in incorrect timestamps in the output file.
...


  


  Everything required for a test case is located in GitHub (akinuri/dump/m4s-segments/). Screenshot of the contents :

  


  

  


  ---

  


  Note : there are two types/formats of audio in the master.json : mp42 and dash. dash works as expected, and seem to be used in limited videos/courses. On the other hand, mp42 appears more. So I need a way to make mp42 work.