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• FFmpeg Centos Compile Error - caused by libwebp (error : implicit declaration of function ‘libwebp_error_to_averror’)

  2 septembre 2022, par fvid1

  I'm trying to compile FFmpeg on Centos 7.9. I followed the official instructions : https://trac.ffmpeg.org/wiki/CompilationGuide/Centos

  


  I need support for WebP images, so I installed libwebp and libwebp-devel via YUM, and used the option --enable-libwebp.

  


  But at the ffmepg "make" stage, the following error is returned :

  


  CC      libavcodec/libwebpenc_common.o
libavcodec/libwebpenc_common.c: In function ‘ff_libwebp_get_frame’:
libavcodec/libwebpenc_common.c:283:17: error: implicit declaration of function ‘libwebp_error_to_averror’ [-Werror=implicit-function-declaration]
                 ret = libwebp_error_to_averror(pic->error_code);
                 ^
cc1: some warnings being treated as errors
make: *** [libavcodec/libwebpenc_common.o] Error 1


  


  Does anyone know why this error is occuring and how it can be corrected ?

  


  I've tried compiling without using --enable-libwebp and it works fine.

  


• Continuous RTMP Streaming with FFmpeg Without Restarting the Process for New Videos

  3 avril 2024, par 刘小佳

  I'm facing a challenge with my workflow and would appreciate any guidance or solutions you might have. My business scenario involves a service that periodically generates new video files locally (e.g., 1.mp4, 2.mp4, ...). These files are then streamed to an RTMP server using FFmpeg, and clients pull the stream via HTTP-FLV for playback.

  


  My goal is to ensure continuous streaming between video files without restarting the FFmpeg process each time a new video is ready to be streamed. Restarting FFmpeg for each new file introduces a disconnect in the client playback, which I'm trying to avoid to maintain stream continuity.

  


  I've explored several approaches based on the FFmpeg Concatenate wiki (https://trac.ffmpeg.org/wiki/Concatenate), but haven't achieved the desired outcome :
  
Approach 1 :
  
Using a list.txt file with ffconcat version 1.0 and dynamically updating the file (next.mp4) being played :

  


  ffconcat version 1.0
file next.mp4
file next.mp4


  


  And then streaming with :
ffmpeg -re -stream_loop -1 -f concat -i list.txt -flush_packets 0 -f flv rtmp://xxx
  
However, when attempting to replace next.mp4 (e.g., moving 2.mp4 to next.mp4 during the streaming of 1.mp4), I encountered a "device busy" error.
  
Approach 2 :
  
Using a nested list approach where list1.txt includes 1.mp4 and list2.txt, and vice versa :

  


  // list1.txt
ffconcat version 1.0
file '1.mp4'
file 'list2.txt'
// list2.txt
ffconcat version 1.0
file '2.mp4'
file 'list1.txt'


  


  Streaming with : ffmpeg -re -stream_loop -1 -f concat -i list1.txt -flush_packets 0 -f flv rtmp://xxx
  
In this setup, I tried modifying list1.txt to replace 1.mp4 with 3.mp4 during the streaming of 2.mp4, but FFmpeg would loop back to 1.mp4 and 2.mp4 before streaming 3.mp4 in the next cycle.

  


  Am I missing something in my methods ? Does anyone have a better approach to fulfill this requirement ? Any help would be greatly appreciated !

  


• Evolution #3488 (Nouveau) : Stocker globalement toutes les requetes passées

  29 juin 2015, par nico d

  Suite au oups de ce commit :
  https://core.spip.net/projects/spip/repository/revisions/22276
  vous avez pu voir que j’ajoute dans une globale toutes les requêtes effectuées.
  Pour éviter une nouvelle boulette j’ai forké chez moi req/mysql.php en req/mysqldebug.php (connecteur perso).

  Cette globale avec toutes les requetes me permet d’afficher sur toutes les pages (public et privé) un petit bandeau avec le nombre de requêtes effectuées et d’autres infos.
  Ce nombre de requêtes affiché me sert à optimiser plus rapidement des squelettes, sans passer par profil ou debug. Ou à vérifier que des pages se mettent bien en cache.
  Exemple :
  

  Est ce que ça vous parait intéressant ?