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Autres articles (104)
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Ajouter des informations spécifiques aux utilisateurs et autres modifications de comportement liées aux auteurs
12 avril 2011, parLa manière la plus simple d’ajouter des informations aux auteurs est d’installer le plugin Inscription3. Il permet également de modifier certains comportements liés aux utilisateurs (référez-vous à sa documentation pour plus d’informations).
Il est également possible d’ajouter des champs aux auteurs en installant les plugins champs extras 2 et Interface pour champs extras. -
Use, discuss, criticize
13 avril 2011, parTalk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
A discussion list is available for all exchanges between users. -
Librairies et logiciels spécifiques aux médias
10 décembre 2010, parPour un fonctionnement correct et optimal, plusieurs choses sont à prendre en considération.
Il est important, après avoir installé apache2, mysql et php5, d’installer d’autres logiciels nécessaires dont les installations sont décrites dans les liens afférants. Un ensemble de librairies multimedias (x264, libtheora, libvpx) utilisées pour l’encodage et le décodage des vidéos et sons afin de supporter le plus grand nombre de fichiers possibles. Cf. : ce tutoriel ; FFMpeg avec le maximum de décodeurs et (...)
Sur d’autres sites (7323)
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lavf/img2dec : Auto-detect Kodak Photo CD image files.
5 septembre 2020, par Carl Eugen Hoyos -
Write timed Live Photo metadata to video using FFMPEG
20 décembre 2020, par Luke BurnsAccording to Apple Live Photo file format, there are three pieces of metadata that need to be written for a JPEG and MOV to be accepted as a live photo. I can use exiftool and ffmpeg to write the necessary content identifier metadata, but I'm having trouble with the timed metadata :
["com.apple.quicktime.still-image-time" : 0xFF]
.

I can't even manage to produce a copy of an existing live photo MOV file using ffmpeg that preserves the necessary timed metadata.


ffmpeg -i original.mov -map 0 -c copy -movflags use_metadata_tags copy.mov



copies the global metadata (i.e. com.apple.quicktime.content.identifier), but loses the necessary still-image-time which can be confirmed using exiftool :


> exiftool -G -U -ee original.mov | grep 'Still Image Time'
[QuickTime] Still Image Time : -1
> exiftool -G -U -ee copy.mov | grep 'Still Image Time'
> 



How can I write the timed metadata using ffmpeg—specifically the still-image-time data ?


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Write Live Photo metadata to video using FFMPEG
13 août 2021, par Luke BurnsAccording to Apple Live Photo file format, there are three pieces of metadata that need to be written for a JPEG and MOV to be accepted as a live photo. I can use exiftool and ffmpeg to write the necessary content identifier metadata.


For the JPEG :


exiftool -TagsFromFile reference.jpeg -makernotes -ContentIdentifier image.jpeg
exiftool -ContentIdentifier="$id" image.jpeg



Similarly, ffmpeg can be used to write the top-level Quicktime metadata with matching id.


However I'm having trouble with the timed metadata :
["com.apple.quicktime.still-image-time" : 0xFF]
.

I can't even manage to produce a copy of an existing live photo MOV file using ffmpeg that preserves the necessary timed metadata.


ffmpeg -i original.mov -map 0 -c copy -movflags use_metadata_tags copy.mov



copies the global metadata (i.e. com.apple.quicktime.content.identifier), but loses the necessary still-image-time which can be confirmed using exiftool :


> exiftool -G -U -ee original.mov | grep 'Still Image Time'
[QuickTime] Still Image Time : -1
> exiftool -G -U -ee copy.mov | grep 'Still Image Time'
> 



How can I write the timed metadata using ffmpeg—specifically the still-image-time data ?


Edit : it looks like this may be happening because ffmpeg does not know how to handle the
mebx
tag on data streams :

[mov @ 0x7fb232091400] Unknown hldr_type for mebx, writing dummy values



And ffmpeg doesn't seem to have a way to copy unknown streams. This appears to also be a problem for dealing with the
fdsc
tag in GoPro metadata streams (e.g. see https://gist.github.com/radimklaska/8974637522a751adb49db0de3be482c9#file-gopro_hevc_to_dnxhd-sh-L125), so it's often copied over asgpmd
data, which ensures it's not overwritten with dummy values, but this trick doesn't work in the case of live photosmebx
metadata.