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Richard Stallman et le logiciel libre
19 octobre 2011, par
Mis à jour : Mai 2013
Langue : français
Type : Texte
Autres articles (51)
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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 (...) -
La sauvegarde automatique de canaux SPIP
1er avril 2010, parDans le cadre de la mise en place d’une plateforme ouverte, il est important pour les hébergeurs de pouvoir disposer de sauvegardes assez régulières pour parer à tout problème éventuel.
Pour réaliser cette tâche on se base sur deux plugins SPIP : Saveauto qui permet une sauvegarde régulière de la base de donnée sous la forme d’un dump mysql (utilisable dans phpmyadmin) mes_fichiers_2 qui permet de réaliser une archive au format zip des données importantes du site (les documents, les éléments (...) -
Publier sur MédiaSpip
13 juin 2013Puis-je poster des contenus à partir d’une tablette Ipad ?
Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir
Sur d’autres sites (10037)
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ffmpeg hevc decoding fail [android]
8 mars 2016, par revannenI am trying to decode h.265 with x265 and ffmpeg library, so that I downloaded ffmpeg 2.8.6 tar and x265 1.9 ver from the official site.
now, the problem is when I decode h.264 with
avcodec_find_decoder(AV_CODEC_ID_H264) ;
is totally fine. :)but, when I try to decode h.265 with
avcodec_find_decoder(AV_CODEC_ID_H265) ;
it tells lots of error log.
like.I/ffmpeg(4153) : nal_unit_type : 32, nuh_layer_id : 0temporal_id : 0
I/ffmpeg(4153) : nal_unit_type : 33, nuh_layer_id : 0temporal_id : 0
I/ffmpeg(4153) : nal_unit_type : 34, nuh_layer_id : 0temporal_id : 0
I/ffmpeg(4153) : nal_unit_type : 19, nuh_layer_id : 0temporal_id : 0
I/ffmpeg(4153) : No start code is found.
I/ffmpeg(4153) : nal_unit_type : 1, nuh_layer_id : 0temporal_id : 0
I/ffmpeg(4153) : nal_unit_type : 1, nuh_layer_id : 0temporal_id : 0
I/ffmpeg(4153) : PPS id out of range : 0
I/ffmpeg(4153) : Error parsing NAL unit #0.
I/ffmpeg(4153) : nal_unit_type : 1, nuh_layer_id : 0temporal_id : 0
I/ffmpeg(4153) : nal_unit_type : 1, nuh_layer_id : 0temporal_id : 0
I/ffmpeg(4153) : PPS id out of range : 0
I/ffmpeg(4153) : Error parsing NAL unit #0.
I/ffmpeg(4153) : nal_unit_type : 1, nuh_layer_id : 0temporal_id : 0
I/ffmpeg(4153) : nal_unit_type : 1, nuh_layer_id : 0temporal_id : 0
I/ffmpeg(4153) : PPS id out of range : 0
I/ffmpeg(4153) : Error parsing NAL unit #0.
I/ffmpeg(4153) : nal_unit_type : 1, nuh_layer_id : 0temporal_id : 0
I/ffmpeg(4153) : nal_unit_type : 1, nuh_layer_id : 0temporal_id : 0
I/ffmpeg(4153) : PPS id out of range : 0
I/ffmpeg(4153) : Error parsing NAL unit #0.
E/decode(4153) : [407] [idvr] Error while decoding frame ! [%d]
E/native(4153) : FAIL......-12
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Is it ffmpeg error ? or x265 library error ?
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should I modify some configuration key value in build level ? or ffmpeg running time level ?
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I would like to know why ffmpeg library keep saying like "No start code is found" && "PPS id out of range" [it is occur in only 265 decoding case, not 264.]
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utvideoenc : Enable support for multiple slices and use them
14 février 2014, par Jan Ekströmutvideoenc : Enable support for multiple slices and use them
The official Ut Video decoder only threads with slices, thus until
now any files encoded by the libavcodec encoder have only been
decodable with a single thread. The default slice count is now
set to subsampled_height / 120.Also sets slices to 1 for the Ut Video encoder tests to keep them
green.Signed-off-by : Derek Buitenhuis <derek.buitenhuis@gmail.com>
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Creating periodic offsets with ffmpeg segment muxer for seamless ffmpeg-concat transitions
30 janvier 2021, par Soren WraySuppose I begin with a 1 minute video with a framerate output of 24 frames/second and then use ffmpeg's segment muxer to split it into 60 equal parts of 1 second each with the timesptamps reset :


ffmpeg -i input.mp4 -map 0 -f segment -segment_time 1 -reset_timestamps 1 -g 24 output_%03d.mp4


I then use ffmpeg-concat to string
output_000.mp4
-output_059.mp4
together into a single video with a periodic 0.5 seconddreamy
transition effect between each segment :ffmpeg-concat -t dreamy -d 500 -o dreamy.mp4 output_*.mp4


Unfortunately, the transition effects introduce a negative 0.5 second offset between the segments, resulting in a video that is 32 seconds in duration. I don't want to deform the audio and video in this manner. I want to use transition effects without changing the duration or creating any other syncing issues. How to best achieve these seamless transitions is the question.


One potential solution would be to add an offset to the segments, e.g. 0.25 seconds at the beginning and end of every segment, such that the segment muxer produces 60 segments of 1.5 second duration from a 1 minute video. In this manner, the 0.5 second transition effects should blend seamlessly into the offsets.


I don't know where to begin to achieve this potential solution. I've read the official guide, but I can't decipher the relevant filter options for this particular use case.
ffmpeg-concat
doesn't seem to provide any native options around this problem either.