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• FFMPEG equalizer clipping audio despite low volume

  23 July 2023, by Tom

  I'm using ffmpeg to equalise audio transferred from historic gramophone records, using standard eqs of the era.

  


  The frequency and gain values are taken from the graphic eq settings listed on the Audacity website - https://plugins.audacityteam.org/additional-resources/eq-curves/playback-equalization-for-78-rpm-shellacs-and-early-33-lps

  


  An example of the Blumlien300 curve here - https://2850314611-files.gitbook.io/ /files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FklCVENFte0GRy5IqVz0W%2Fuploads%2FJHS6Mv121GX1h898xy4K%2FBlumlein300_3.2.2.txt?alt=media&token=8d04df05-366d-47f8-8c82-149fa5eda59a

  


  The audio file I'm testing with has a digital peak of -35db, the highest gain value applied on this eq is 17db. When I run the ffmpeg command though, it reports the audio is clipping and the result is a horribly distorted recording.

  


  Can anyone advise why this is happening? I run the same file through the same eq settings in Audacity and the result is as expected.

  


  set eq="equalizer=f=22050:g=-0.4,equalizer=f=21203.720228928225:g=-0.4,equalizer=f=20389.920705063967:g=-0.4,equalizer=f=19607.354835383569:g=-0.4,equalizer=f=18854.823871147240:g=-0.4,equalizer=f=18131.175071633737:g=-0.4,equalizer=f=17435.299938351014:g=-0.4,equalizer=f=16766.132517017904:g=-0.4,equalizer=f=16122.647764715837:g=-0.4,equalizer=f=15503.859979709296:g=-0.4,equalizer=f=14908.821291529812:g=-0.4,equalizer=f=14336.620209010769:g=-0.4,equalizer=f=13786.380224048187:g=-0.4,equalizer=f=13257.258468950000:g=-0.4,equalizer=f=12748.444425315412:g=-0.4,equalizer=f=12259.158682468413:g=-0.4,equalizer=f=11788.651743541806:g=-0.4,equalizer=f=11336.202877384472:g=-0.4,equalizer=f=10901.119014532051:g=-0.4,equalizer=f=10482.733685550458:g=-0.4,equalizer=f=10080.406000125797:g=-0.4,equalizer=f=9693.519665336817:g=-0.4,equalizer=f=9321.482041606178:g=-0.4,equalizer=f=8963.723234884175:g=-0.4,equalizer=f=8619.695223674737:g=-0.4,equalizer=f=8288.871019565895:g=-0.4,equalizer=f=7970.743859979441:g=-0.4,equalizer=f=7664.826431902562:g=-0.4,equalizer=f=7370.650125412990:g=-0.4,equalizer=f=7087.764315853595:g=-0.4,equalizer=f=6815.735673557399:g=-0.4,equalizer=f=6554.147500065165:g=-0.4,equalizer=f=6302.599089819104:g=-0.4,equalizer=f=6060.705116354743:g=-0.4,equalizer=f=5828.095042050793:g=-0.4,equalizer=f=5604.412550532827:g=-0.4,equalizer=f=5389.315000861326:g=-0.4,equalizer=f=5182.472902668021:g=-0.394052055589,equalizer=f=4983.569411436476:g=-0.386751590389,equalizer=f=4792.299843153906:g=-0.376185664074,equalizer=f=4608.371207590573:g=-0.362543760251,equalizer=f=4431.501759492006:g=-0.345993198097,equalizer=f=4261.420566996452:g=-0.330710126890,equalizer=f=4097.867096616487:g=-0.318503033191,equalizer=f=3940.590814149046:g=-0.309564283335,equalizer=f=3789.350800902538:g=-0.303741189604,equalizer=f=3643.915384653179:g=-0.300601888512,equalizer=f=3504.061784765236:g=-0.3,equalizer=f=3369.575770931567:g=-0.3,equalizer=f=3240.251335011708:g=-0.3,equalizer=f=3115.890375464830:g=-0.3,equalizer=f=2996.302393894170:g=-0.3,equalizer=f=2881.304203238093:g=-0.3,equalizer=f=2770.719647160795:g=-0.3,equalizer=f=2664.379330212802:g=-0.3,equalizer=f=2562.120358347913:g=-0.3,equalizer=f=2463.786089399117:g=-0.3,equalizer=f=2369.225893131248:g=-0.3,equalizer=f=2278.294920502843:g=-0.3,equalizer=f=2190.853881783698:g=-0.3,equalizer=f=2106.768833188346:g=-0.296437432785,equalizer=f=2025.910971698469:g=-0.290217913930,equalizer=f=1948.156437760116:g=-0.280922418484,equalizer=f=1873.386125553329:g=-0.268550946447,equalizer=f=1801.485500543704:g=-0.253103497820,equalizer=f=1732.344424036255:g=-0.235614749092,equalizer=f=1665.856984462975:g=-0.218076286078,equalizer=f=1601.921335145533:g=-0.200537822606,equalizer=f=1540.439538284674:g=-0.184632657170,equalizer=f=1481.317414937308:g=-0.168779161348,equalizer=f=1424.464400751469:g=-0.152925665153,equalizer=f=1369.793407238189:g=-0.137072168707,equalizer=f=1317.220688367753:g=-0.121218672255,equalizer=f=1266.665712285991:g=-0.105365175802,equalizer=f=1218.051037954117:g=-0.088396941462,equalizer=f=1171.302196523118:g=-0.070858476440,equalizer=f=1126.347577261013:g=-0.053320011417,equalizer=f=1083.118317858216:g=-0.034770724190,equalizer=f=1041.548198942992:g=-0.013200571808,equalizer=f=1001.573542645411:g=0.011445558081,equalizer=f=963.133115054414:g=0.039167665478,equalizer=f=926.168032418592:g=0.069965750383,equalizer=f=890.621670946974:g=0.103839812794,equalizer=f=856.439580071665:g=0.140789852714,equalizer=f=823.569399039473:g=0.180815870141,equalizer=f=791.960776704742:g=0.223158863450,equalizer=f=761.565294400547:g=0.266149082252,equalizer=f=732.336391770094:g=0.311823093692,equalizer=f=704.229295444710:g=0.360237839089,equalizer=f=677.200950459179:g=0.413174176689,equalizer=f=651.209954299352:g=0.471478099167,equalizer=f=626.216493481026:g=0.535493496953,equalizer=f=602.182282562909:g=0.606978871276,equalizer=f=579.070505500287:g=0.684199304160,equalizer=f=556.845759249530:g=0.767096732395,equalizer=f=535.473999537060:g=0.853776460170,equalizer=f=514.922488709709:g=0.943323717867,equalizer=f=495.159745586582:g=1.036571598687,equalizer=f=476.155497235608:g=1.135335711982,equalizer=f=457.880632600910:g=1.237175803242,equalizer=f=440.307157909949:g=1.342335109599,equalizer=f=423.408153792158:g=1.453088412615,equalizer=f=407.157734043353:g=1.569993670188,equalizer=f=391.531005972773:g=1.688508164136,equalizer=f=376.504032271996:g=1.808802987893,equalizer=f=362.053794347337:g=1.934465396527,equalizer=f=348.158157059540:g=2.065823830001,equalizer=f=334.795834816768:g=2.204891058267,equalizer=f=321.946358968944:g=2.352009664049,equalizer=f=309.590046453497:g=2.509552803849,equalizer=f=297.707969644483:g=2.678532979186,equalizer=f=286.281927358906:g=2.856115742576,equalizer=f=275.294416975809:g=3.041612670003,equalizer=f=264.728607625441:g=3.230723044219,equalizer=f=254.568314407418:g=3.422700948357,equalizer=f=244.797973598401:g=3.621312762050,equalizer=f=235.402618811295:g=3.826195809769,equalizer=f=226.367858069467:g=4.034154835453,equalizer=f=217.679851760848:g=4.246639157749,equalizer=f=209.325291438168:g=4.468048945659,equalizer=f=201.291379432825:g=4.698686666092,equalizer=f=193.565809251186:g=4.938552319047,equalizer=f=186.136746723276:g=5.187645904525,equalizer=f=178.992811874976:g=5.445967422525,equalizer=f=172.123061495972:g=5.712025685327,equalizer=f=165.516972376744:g=5.984236264250,equalizer=f=159.164425188922:g=6.258981796419,equalizer=f=153.055688984312:g=6.515823590632,equalizer=f=147.181406288853:g=6.777692051390,equalizer=f=141.532578768664:g=7.044587178695,equalizer=f=136.100553446236:g=7.314095599483,equalizer=f=130.877009445637:g=7.583605034445,equalizer=f=125.853945246444:g=7.853114469407,equalizer=f=121.023666426868:g=8.146285201135,equalizer=f=116.378773877299:g=8.444439101287,equalizer=f=111.912152466211:g=8.742593001439,equalizer=f=107.616960141075:g=9.042209423688,equalizer=f=103.486617447577:g=9.344900874707,equalizer=f=99.514797451091:g=9.650668303691,equalizer=f=95.695416044961:g=9.959511710641,equalizer=f=92.022622630759:g=10.271431095557,equalizer=f=88.490791156230:g=10.586541422511,equalizer=f=85.094511497198:g=10.906991735356,equalizer=f=81.828581170245:g=11.233594002758,equalizer=f=78.687997363448:g=11.556996378650,equalizer=f=75.667949272979:g=11.873211536187,equalizer=f=72.763810733831:g=12.194794278600,equalizer=f=69.971133133372:g=12.521192148224,equalizer=f=67.285638596875:g=12.846501740168,equalizer=f=64.703213434600:g=13.169127539473,equalizer=f=62.219901840358:g=13.492484068742,equalizer=f=59.831899831942:g=13.820346094285,equalizer=f=57.535549424116:g=14.145340590334,equalizer=f=55.327333025244:g=14.467659297988,equalizer=f=53.203868048980:g=14.789401139821,equalizer=f=51.161901732761:g=15.111142981226,equalizer=f=49.198306155165:g=15.437629968456,equalizer=f=47.310073444503:g=15.770860796927,equalizer=f=45.494311171305:g=16.104091624940,equalizer=f=43.748237917649:g=16.412536097232,equalizer=f=42.069179016527:g=16.579143834849,equalizer=f=40.454562454745:g=16.588876722789,equalizer=f=38.901914933067:g=16.461103901687,equalizer=f=37.408858077565:g=16.215674576171,equalizer=f=35.973104796389:g=15.850016386783,equalizer=f=34.592455776352:g=15.350234288456,equalizer=f=33.264796113983:g=14.615823142814,equalizer=f=31.988092075884:g=13.626809695512,equalizer=f=30.760387983412:g=12.332756508563,equalizer=f=29.579803216941:g=10.518513413063,equalizer=f=28.444529335092:g=8.346792732977,equalizer=f=27.352827304528:g=5.833681758551,equalizer=f=26.303024836072:g=3.097942665008,equalizer=f=25.293513823067:g=0.163604913582,equalizer=f=24.322747878043:g=-2.887748621210,equalizer=f=23.389239963935:g=-6.091081601564,equalizer=f=22.491560116216:g=-9.478973229620,equalizer=f=21.628333252442:g=-12.539218030638,equalizer=f=20.798237065887:g=-14.384804507659,equalizer=f=20:g=-15"
ffmpeg -i "File.wav" -af %eq% -c:a pcm_s24le out.wav


  


• Anomalie #4523 (Nouveau): warning et fatal error en php 8 en partie publique

  14 July 2020, by Franck D

  Hello :)

  Windows 10 (1909)
  Firefox 78.0.2
  Easyphp
  Apache 2.4.43 x64
  PHP 8.0.0 alpha1 x64
  MySQL 8.0.20 x64
  PhpMyAdmin 5.0.2
  spip 3.3
  Prefix des tables: spip5

  Une fois installer spip je vais dans la partie publique du site, et j’ai une page blanche qui s’affiche avec dedans:

  Warning: Illegal string offset ’status’ in C:\Program Files (x86)\EasyPHP-Devserver-17\eds-www\test5\ecrire\public\assembler.php on line 457

  Warning: Only the first byte will be assigned to the string offset in C:\Program Files (x86)\EasyPHP-Devserver-17\eds-www\test5\ecrire\public\assembler.php on line 457

  Warning: Illegal string offset ’entetes’ in C:\Program Files (x86)\EasyPHP-Devserver-17\eds-www\test5\ecrire\public\assembler.php on line 163

  Fatal error: Uncaught Error: Cannot use string offset as an array in C:\Program Files (x86)\EasyPHP-Devserver-17\eds-www\test5\ecrire\public\assembler.php:163 Stack trace: #0 C:\Program Files (x86)\EasyPHP-Devserver-17\eds-www\test5\ecrire\public.php(117): assembler(’sommaire’, NULL) #1 C:\Program Files (x86)\EasyPHP-Devserver-17\eds-www\test5\spip.php(20): include(’C:\Program File...’) #2 C:\Program Files (x86)\EasyPHP-Devserver-17\eds-www\test5\index.php(3): include(’C:\Program File...’) #3 main thrown in C:\Program Files (x86)\EasyPHP-Devserver-17\eds-www\test5\ecrire\public\assembler.php on line 163

• Anomalie #4522 (En cours): erreur en php 8 dans mysql.log

  14 July 2020, by Franck D

  Hello :)

  Windows 10 (1909)
  Firefox 78.0.2
  Easyphp
  Apache 2.4.43 x64
  PHP 8.0.0 alpha1 x64
  MySQL 8.0.20 x64
  PhpMyAdmin 5.0.2
  Prefix des tables "spip5"
  Je fais tout afficher via mes_options, j’installe spip 3.3 ensuite, je regarde les logs de la table mysql.log et cela m’affiche 5 erreurs ( à voir si ce n’est pas "normal" quand même, car cela semble fonctionner quand même)

  2020-07-14 14:48:35 127.0.0.1 (pid 1576) C:\Program Files (x86)\EasyPHP-Devserver-17\eds-www\test5\ecrire\base\connect_sql.php:L170:spip_sql_erreur()::Pub:ERREUR: Erreur 1525 de mysql: Incorrect TIMESTAMP value: ’’2020-07-13 14:48:35’’
  in C:\Program Files (x86)\EasyPHP-Devserver-17\eds-www\test5\plugins-dist\forum\forum_pipelines.php L308 [sql_delete(),forum_optimiser_base_disparus(),minipipe(),execute_pipeline_optimiser_base_disparus(),pipeline(),optimiser_base_disparus(),optimiser_base(),genie_optimiser_dist(),queue_start_job(),queue_schedule(),inc_genie_dist(),cron(),action_cron(),traiter_appels_actions(),include()]
  DELETE FROM `spip`.spip5_forum
  WHERE statut=’redac’ AND maj < ’\’2020-07-13 14:48:35\’’

  2020-07-14 14:48:35 127.0.0.1 (pid 1576) C:\Program Files (x86)\EasyPHP-Devserver-17\eds-www\test5\ecrire\base\connect_sql.php:L170:spip_sql_erreur()::Pub:ERREUR: Erreur 1525 de mysql: Incorrect TIMESTAMP value: ’’2020-07-13 14:48:35’’
  in C:\Program Files (x86)\EasyPHP-Devserver-17\eds-www\test5\plugins-dist\mots\mots_pipelines.php L97 [sql_delete(),mots_optimiser_base_disparus(),minipipe(),execute_pipeline_optimiser_base_disparus(),pipeline(),optimiser_base_disparus(),optimiser_base(),genie_optimiser_dist(),queue_start_job(),queue_schedule(),inc_genie_dist(),cron(),action_cron(),traiter_appels_actions(),include()]
  DELETE FROM `spip`.spip5_mots
  WHERE length(titre)=0 AND maj < ’\’2020-07-13 14:48:35\’’

  2020-07-14 14:48:35 127.0.0.1 (pid 1576) C:\Program Files (x86)\EasyPHP-Devserver-17\eds-www\test5\ecrire\base\connect_sql.php:L170:spip_sql_erreur()::Pub:ERREUR: Erreur 1525 de mysql: Incorrect TIMESTAMP value: ’’2020-07-13 14:48:35’’
  in C:\Program Files (x86)\EasyPHP-Devserver-17\eds-www\test5\plugins-dist\petitions\petitions_pipelines.php L78 [sql_delete(),petitions_optimiser_base_disparus(),minipipe(),execute_pipeline_optimiser_base_disparus(),pipeline(),optimiser_base_disparus(),optimiser_base(),genie_optimiser_dist(),queue_start_job(),queue_schedule(),inc_genie_dist(),cron(),action_cron(),traiter_appels_actions(),include()]
  DELETE FROM `spip`.spip5_petitions
  WHERE statut=’poubelle’ AND maj < ’\’2020-07-13 14:48:35\’’

  2020-07-14 14:48:35 127.0.0.1 (pid 1576) C:\Program Files (x86)\EasyPHP-Devserver-17\eds-www\test5\ecrire\base\connect_sql.php:L170:spip_sql_erreur()::Pub:ERREUR: Erreur 1525 de mysql: Incorrect TIMESTAMP value: ’’2020-07-13 14:48:35’’
  in C:\Program Files (x86)\EasyPHP-Devserver-17\eds-www\test5\plugins-dist\sites\sites_pipelines.php L228 [sql_delete(),sites_optimiser_base_disparus(),minipipe(),execute_pipeline_optimiser_base_disparus(),pipeline(),optimiser_base_disparus(),optimiser_base(),genie_optimiser_dist(),queue_start_job(),queue_schedule(),inc_genie_dist(),cron(),action_cron(),traiter_appels_actions(),include()]
  DELETE FROM `spip`.spip5_syndic
  WHERE maj<’\’2020-07-13 14:48:35\’’ AND statut=’refuse’

  2020-07-14 14:48:35 127.0.0.1 (pid 1576) C:\Program Files (x86)\EasyPHP-Devserver-17\eds-www\test5\ecrire\base\connect_sql.php:L170:spip_sql_erreur()::Pub:ERREUR: Erreur 1525 de mysql: Incorrect TIMESTAMP value: ’’2020-07-13 14:48:35’’
  in C:\Program Files (x86)\EasyPHP-Devserver-17\eds-www\test5\plugins-dist\breves\breves_pipelines.php L298 [sql_select(),breves_optimiser_base_disparus(),minipipe(),execute_pipeline_optimiser_base_disparus(),pipeline(),optimiser_base_disparus(),optimiser_base(),genie_optimiser_dist(),queue_start_job(),queue_schedule(),inc_genie_dist(),cron(),action_cron(),traiter_appels_actions(),include()]
  SELECT B.id_breve AS id
  FROM `spip`.spip5_breves AS B
  LEFT JOIN `spip`.spip5_rubriques AS R
  ON B.id_rubrique=R.id_rubrique
  WHERE R.id_rubrique IS NULL
  AND B.maj < ’\’2020-07-13 14:48:35\’’