
Recherche avancée
Médias (1)
-
The Great Big Beautiful Tomorrow
28 octobre 2011, par
Mis à jour : Octobre 2011
Langue : English
Type : Texte
Autres articles (71)
-
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 ;
-
Les autorisations surchargées par les plugins
27 avril 2010, parMediaspip core
autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs
Sur d’autres sites (12794)
-
ffmpeg concat drops audio frames
5 octobre 2017, par ShaunI have an mp4 file and I want to take two sequential sections of the video out and render them as individual files, later recombining them back into the original video. For instance, with my video
video.mp4
, I can runffmpeg -i video.mp4 -ss 56 -t 4 out1.mp4
ffmpeg -i video.mp4 -ss 60 -t 4 out2.mp4creating
out1.mp4
which contains 00:00:56 to 00:01:00 ofvideo.mp4
, andout2.mp4
which contains 00:01:00 to 00:01:04. However, later I want to be able to recombine them again quickly (i.e., without reencoding), so I use the concat demuxer,ffmpeg -f concat -safe 0 -i files.txt -c copy concat.mp4
where
files.txt
containsfile out1.mp4
file out2.mp4which theoretically should give me back 00:00:56 to 00:01:04 of
video.mp4
, however there are always dropped audio frames where the concatenation occurs, creating a very unpleasant sound artifact, an audio blip, if you will.I have tried using
async
and-af apad
on initially creating the two sections of the video but I am still faced with the same problem, and have not found the solution elsewhere. I have experienced this issue in multiple different use cases, so hopefully this simple example will shed some light on the real problem. -
lavf : Remove codec_tag from dashenc and smoothstreamingenc
30 juin 2017, par Martin Storsjölavf : Remove codec_tag from dashenc and smoothstreamingenc
Currently, the tags enforced and set on the segmenter muxer level
mismatch what the mp4/ismv muxer uses (since 713efb2c0d013).Skip the codec_tag altogether here, to let the user (try to) set
whichever codec/tag is preferred ; the individual chained muxer will
reject invalid codecs anyway.Signed-off-by : Martin Storsjö <martin@martin.st>
-
libavformat : Improve ff_configure_buffers_for_index for excessive deltas
21 mars 2023, par Martin Storsjölibavformat : Improve ff_configure_buffers_for_index for excessive deltas
Previously, the ff_configure_buffers_for_index function had
upper sanity limits of 16 MB (1<<24) for buffer_size and
8 MB (1<<23) for short_seek_threshold.However, if the index contained entries with a much larger
delta, setting pos_delta to a value larger than the sanity
limit, we would end up not increasing the buffer size at all.Instead, ignore the individual deltas that are excessive, but
increase the buffer size based on the deltas that are below the
sanity limit.Only count deltas that are below 1<<23, 8 MB ; pos_delta gets doubled
before setting the buffer size - this matches the previous maximum
buffer size of 1<<24, 16 MB.This can happen e.g. with a mov file with some tracks containing
some samples that belong in the start of the file, at the end of
the mdat, while the rest of the file is mostly reasonably interleaved ;
previously those samples caused the maximum pos_delta to skyrocket,
skipping any buffer size enlargement.Signed-off-by : Martin Storsjö <martin@martin.st>