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• Revert "Disable warnings for casting pointers to integers, there is nothing wrong...

  20 novembre 2021, par Andreas Rheinhardt

  Revert "Disable warnings for casting pointers to integers, there is nothing wrong with that."
  This reverts commit 5258f64a14713499cf84840b3ab3a1ee7cdcaeb8.
  
  The premise of said commit (that conversions from pointer to int
  
  are ok) is wrong : C99/C11 6.3.2.3 5 : "Any pointer type may be converted
  
  to an integer type. [...] If the result cannot be represented in the
  
  integer type, the behavior is undefined." (C90 6.3.4 contains a similar
  
  restriction.) So don't disable -Wpointer-to-int-cast.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] configure

• Add, remove and tune filters on running ffmpeg

  28 mai 2023, par Turmund

  Preface

  


  I have been fiddling around with ffmpeg and ffplay using command line adding and tuning filters and effects.

  


  It quickly becomes rather tiresome to

  


  

  1. start playback with some audio file

  


  2. stop

  


  3. modify command

  


  4. back to 1.

  


  


  When for example fine-tuning noise reduction or adding effects and equalizer.

  


  I have played around with using zmq to tune filters by executing commands in a different terminal, but this also becomes somewhat cumbersome.

  


  I want some interface where I can add, remove and tune filters during runtime / while listening to the changes taking effect.

  


  FFMPEG

  


  I use filter to mean effect / filter from here on out. For example afftdn, rubberband, ...

  


  ffmpeg is somewhat intimidating. It's powerful but also complex, at least when starting to dig into it. :0

  


  Looking at the library and examples I am looking at API example for audio decoding and filtering, - which at least at first looks promising as a starting platter.

  


  Output

  


  I imagine it would be best to have multiple sinks or some container with multiple audio tracks :

  


  

  1. Raw audio

  


  2. Audio with effects applied

  


  


  Optionally :

  


  

  1. Raw audio

  


  2. Audio with all filters

  


  3. Audio with filter group 1

  


  4. Audio with filter group 2

  


  5. ... etc.

  


  


  ---

  


  Processing

  


  I imagine the routine would have to be something like :

  


  

  1. Read packet from stream/file/url

  


  2. Unpack the sample

  


  3. Copy / duplicate sample for each filter group / or one for filters

  


  4. Apply filter(s) to these “effect sample” (s)

  


  5. Write raw audio, filtered audio 1, filtered audio 2, filtered audio N, ... to out

  


  


  Or for step 3 - 5 (as one would only be listening to one track at a time (But this is perhaps not the best if one decide to jump back / forth in the audio stream) :

  


  

  3. Apply currently active filter(s)

  


  4. Write raw audio, filtered audio to out

  


  


  Simultaneously one would read and check changes to filters by some interface. I.e. input :

  


  afftdn=rf=-20:nr=20


  


  then, if afftdn is not present in filters add it, else set new values.

  


  Idea is to output "raw-audio". I.e. used in a sampling and tuning phase - then produce a line with filter-options one can use with the ffmpeg-tool to process the audio files once satisfied.

  


  Questions section

  


  

  • Does something similar exist ?

  


  


  General :

  


  

  • Does this seem like a way to do it and use the ffmpeg library ?

    

    • Can one add, remove and change filter values during runtime or do one have to re-initialize the entire stream for each added / removed filter etc ?

    


    • Is the “Processing” part sound ?

    


    


  


  • Would using a container that supports multiple audio tracks be the likely best solution ? E.g. mp4.

    

    • Any container preferred over others ?

    


    • Any drawbacks (i.e. jumping back / forth in the stream)

    


    


  


  


  ---

  


  Sub-note

  


  Dream is to have a Arduino interfacing with this program where I use physical rotary switches, incremental rotary encoders, buttons and whistles. Tuning the various options for the filters using physical knobs. But at first I need some working sample where I use FIFO or what ever to test ffmpeg itself.

  


• Anomalie #3100 (Nouveau) : Bug - Base PostgreSQL

  20 novembre 2013, par _ CasP

  Bonjour,
  Je viens de créer un site mutualisé sur mon site. Mon ancien site à une base MYSQL et n’a pas de souci.
  En revanche le nouveau site à lui une base PostgreSQL.

  L’hébergement est chez OVH.

  je constate 2 chose étrange la première : lors de l’instalation du site après avoir renseigné le serveur et l’utilisateur, je me retrouve à avoir le choix parmi une multitude de base de donnée. Là ou habituellement je n’ai que le nom de celle que j’ai crée.
  Mais peux être ceci est un souci lié à OVH, je leur ai écrit pour demander.

  Le deuxième Bug a lieu lors de la création de RUBRIQUES dans l’espace privée.
  Cela fonctionne, cependant après la création je me retrouve avec une

  3 Erreur(s) dans le squeletteNuméro Message squelette boucle Ligne
  1 Array / /
  2 Array / /
  3 Array / /

  Warning : pg_query() [function.pg-query] : Query failed : ERREUR : la référence à la colonne « id_rubrique » est ambigu LINE 4 : GROUP BY id_rubrique,lang ^ in /homez.64/casp/www/ecrire/req/pg.php on line 168

  Warning : pg_query() [function.pg-query] : Query failed : ERREUR : la référence à la colonne « lang » est ambigu LINE 4 : GROUP BY id_article,lang ^ in /homez.64/casp/www/ecrire/req/pg.php on line 168

  Warning : pg_query() [function.pg-query] : Query failed : ERREUR : la référence à la colonne « lang » est ambigu LINE 4 : GROUP BY id_breve,lang ^ in /homez.64/casp/www/ecrire/req/pg.php on line 168

  Et je reste sur la page de crétion sans être redirigé. J’ai alors l’option :
  Votre modification a été enregistrée
  Si votre navigateur n’est pas redirigé, cliquez ici pour continuer.
  Tout fonctionne ce n’est donc pas dramatique. Mais c’est un peu gènant.