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1 000 000 (wav version)
26 septembre 2011, par
Mis à jour : Avril 2013
Langue : English
Type : Audio
Autres articles (84)
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Mise à jour de la version 0.1 vers 0.2
24 juin 2013, parExplications des différents changements notables lors du passage de la version 0.1 de MediaSPIP à la version 0.3. Quelles sont les nouveautés
Au niveau des dépendances logicielles Utilisation des dernières versions de FFMpeg (>= v1.2.1) ; Installation des dépendances pour Smush ; Installation de MediaInfo et FFprobe pour la récupération des métadonnées ; On n’utilise plus ffmpeg2theora ; On n’installe plus flvtool2 au profit de flvtool++ ; On n’installe plus ffmpeg-php qui n’est plus maintenu au (...) -
Personnaliser en ajoutant son logo, sa bannière ou son image de fond
5 septembre 2013, parCertains thèmes prennent en compte trois éléments de personnalisation : l’ajout d’un logo ; l’ajout d’une bannière l’ajout d’une image de fond ;
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Keeping control of your media in your hands
13 avril 2011, parThe vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)
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AAC : Fix M/S stereo encoding
3 mars 2015, par Claudio FreireAAC : Fix M/S stereo encoding
This patch fixes a pointer arithmetic bug in adjust_frame_information that resulted in heavily corrupted audio when using M/S encoding. Also, a backup copy of untransformed coefficients has to be kept around or attempts at re-processing the frame (which happens when hevavily overspending bits during transients) will result in re-encoding of the coefficients and subsequent corruption of the resulting stream.
A/B testing shows the bug as corrected, but still cannot prove that M/S coding is a win at least in numbers. Limited listening tests do show improvement on M/S encoded samples in lower bitrates, but they’re hidden among the other artifacts that remain to be corrected in the encoder.
Some of the regressions flagged in the report do show poor stereo image (but not buggy), so M/S encoding is clearly not good enough yet to be defaulted to auto.
In numbers, Patched against Unpatched, stereo_mode auto :
Files : 114
Bitrates : 6
Tests : 683Serious Regressions : 0 (0%)
Regressions : 0 (0%)
Improvements : 227 (33%)
Big improvements : 92 (13%)
Worst regression - mybloodrusts.wv - 256k
- StdDev : 28.61 pSNR : -0.43 maxdiff : 1372.00
Best improvement - 60.wv - 384k
- StdDev : -369.57 pSNR : 45.02 maxdiff : -13322.00
Average - StdDev : -80.56 pSNR : 2.49 maxdiff : -8858.00Patched against Unpatched stereo_mode ms_off shows no difference.
Patched stereo_mode auto vs Unpatched stereo_mode ms_off shows a small average improvement, just not too significant :
Serious Regressions : 0 (0%)
Regressions : 10 (1%)
Improvements : 45 (6%)
Big improvements : 2 (0%)
Worst regression - Illinois.wv - 256k
- StdDev : 33.20 pSNR : -2.03 maxdiff : 477.00
Best improvement - song_of_circomstances.flac - 384k
- StdDev : -3.97 pSNR : 7.61 maxdiff : -826.00
Average - StdDev : -10.25 pSNR : 0.20 maxdiff : -281.00Signed-off-by : Michael Niedermayer <michaelni@gmx.at>