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Publier une image simplement
13 avril 2011, par ,
Mis à jour : Février 2012
Langue : français
Type : Video
Autres articles (69)
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Pas question de marché, de cloud etc...
10 avril 2011Le vocabulaire utilisé sur ce site essaie d’éviter toute référence à la mode qui fleurit allègrement
sur le web 2.0 et dans les entreprises qui en vivent.
Vous êtes donc invité à bannir l’utilisation des termes "Brand", "Cloud", "Marché" etc...
Notre motivation est avant tout de créer un outil simple, accessible à pour tout le monde, favorisant
le partage de créations sur Internet et permettant aux auteurs de garder une autonomie optimale.
Aucun "contrat Gold ou Premium" n’est donc prévu, aucun (...) -
Mediabox : ouvrir les images dans l’espace maximal pour l’utilisateur
8 février 2011, parLa visualisation des images est restreinte par la largeur accordée par le design du site (dépendant du thème utilisé). Elles sont donc visibles sous un format réduit. Afin de profiter de l’ensemble de la place disponible sur l’écran de l’utilisateur, il est possible d’ajouter une fonctionnalité d’affichage de l’image dans une boite multimedia apparaissant au dessus du reste du contenu.
Pour ce faire il est nécessaire d’installer le plugin "Mediabox".
Configuration de la boite multimédia
Dès (...) -
Activation de l’inscription des visiteurs
12 avril 2011, parIl est également possible d’activer l’inscription des visiteurs ce qui permettra à tout un chacun d’ouvrir soit même un compte sur le canal en question dans le cadre de projets ouverts par exemple.
Pour ce faire, il suffit d’aller dans l’espace de configuration du site en choisissant le sous menus "Gestion des utilisateurs". Le premier formulaire visible correspond à cette fonctionnalité.
Par défaut, MediaSPIP a créé lors de son initialisation un élément de menu dans le menu du haut de la page menant (...)
Sur d’autres sites (11090)
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Some videos fail to chromecast with error MEDIA_UNKNOWN
1er juin 2020, par JonasVautherinUsing
mkchromecastto cast local mp4 files, some videos work, and some don't (as in : the screen hangs on the blue chromecast logo, suggesting that the initial connection worked). I can reproduce exactly the issue described here.


So I decided to go one level lower, with
pychromecast, and try to see what actually happens when it hangs on the blue logo. I converted two videos to HLS format, and exposed them through an http server. The video that works withmkchromecastalso works with my setup, but the one that fails, well... fails on both. Withpychromecast, I don't get much more information than :




ERROR, code 100 : MEDIA_UNKNOWN.





From the Cast documentation, this error means :





The media element encountered an unknown error fired from platform. The media element encountered an error that did not indicate it's one of MediaError.MEDIA_ERR_*. This should be rare.





It is not rare for me at all, though. I thought that maybe the failing video was in an unsupported format, as described in the documentation. So I tried to compare both videos with the following command :



ffprobe -v quiet -print_format json -show_streams 



Video that works :



{
 "streams": [
 {
 "index": 0,
 "codec_name": "h264",
 "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
 "profile": "High",
 "codec_type": "video",
 "codec_time_base": "1001/48000",
 "codec_tag_string": "avc1",
 "codec_tag": "0x31637661",
 "width": 1920,
 "height": 1080,
 "coded_width": 1920,
 "coded_height": 1088,
 "has_b_frames": 2,
 "sample_aspect_ratio": "1:1",
 "display_aspect_ratio": "16:9",
 "pix_fmt": "yuv420p",
 "level": 50,
 "chroma_location": "left",
 "refs": 1,
 "is_avc": "true",
 "nal_length_size": "4",
 "r_frame_rate": "24000/1001",
 "avg_frame_rate": "24000/1001",
 "time_base": "1/24000",
 "start_pts": 0,
 "start_time": "0.000000",
 "duration_ts": 47127080,
 "duration": "1963.628333",
 "bit_rate": "5527977",
 "bits_per_raw_sample": "8",
 "nb_frames": "47080",
 "disposition": {
 "default": 1,
 "dub": 0,
 "original": 0,
 "comment": 0,
 "lyrics": 0,
 "karaoke": 0,
 "forced": 0,
 "hearing_impaired": 0,
 "visual_impaired": 0,
 "clean_effects": 0,
 "attached_pic": 0,
 "timed_thumbnails": 0
 },
 "tags": {
 "language": "und",
 "handler_name": "VideoHandler"
 }
 },
 {
 "index": 1,
 "codec_name": "aac",
 "codec_long_name": "AAC (Advanced Audio Coding)",
 "profile": "LC",
 "codec_type": "audio",
 "codec_time_base": "1/48000",
 "codec_tag_string": "mp4a",
 "codec_tag": "0x6134706d",
 "sample_fmt": "fltp",
 "sample_rate": "48000",
 "channels": 2,
 "channel_layout": "stereo",
 "bits_per_sample": 0,
 "r_frame_rate": "0/0",
 "avg_frame_rate": "0/0",
 "time_base": "1/48000",
 "start_pts": 0,
 "start_time": "0.000000",
 "duration_ts": 94254528,
 "duration": "1963.636000",
 "bit_rate": "125776",
 "max_bit_rate": "125776",
 "nb_frames": "92048",
 "disposition": {
 "default": 1,
 "dub": 0,
 "original": 0,
 "comment": 0,
 "lyrics": 0,
 "karaoke": 0,
 "forced": 0,
 "hearing_impaired": 0,
 "visual_impaired": 0,
 "clean_effects": 0,
 "attached_pic": 0,
 "timed_thumbnails": 0
 },
 "tags": {
 "language": "und",
 "handler_name": "SoundHandler"
 }
 }
 ]
}



Video that does NOT work :



{ 
 "streams": [
 {
 "index": 0,
 "codec_name": "h264",
 "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
 "profile": "High",
 "codec_type": "video",
 "codec_time_base": "125/5994",
 "codec_tag_string": "avc1",
 "codec_tag": "0x31637661",
 "width": 1920,
 "height": 1040,
 "coded_width": 1920,
 "coded_height": 1040,
 "has_b_frames": 2,
 "sample_aspect_ratio": "1:1",
 "display_aspect_ratio": "24:13",
 "pix_fmt": "yuv420p",
 "level": 41,
 "chroma_location": "left",
 "refs": 1,
 "is_avc": "true",
 "nal_length_size": "4",
 "r_frame_rate": "2997/125",
 "avg_frame_rate": "2997/125",
 "time_base": "1/11988",
 "start_pts": 0,
 "start_time": "0.000000",
 "duration_ts": 97032000,
 "duration": "8094.094094",
 "bit_rate": "2499644",
 "bits_per_raw_sample": "8",
 "nb_frames": "194064",
 "disposition": {
 "default": 1,
 "dub": 0,
 "original": 0,
 "comment": 0,
 "lyrics": 0,
 "karaoke": 0,
 "forced": 0,
 "hearing_impaired": 0,
 "visual_impaired": 0,
 "clean_effects": 0,
 "attached_pic": 0,
 "timed_thumbnails": 0
 },
 "tags": {
 "creation_time": "2020-03-27T09:56:39.000000Z",
 "language": "und",
 "handler_name": "L-SMASH Video Media Handler"
 }
 },
 {
 "index": 1,
 "codec_name": "aac",
 "codec_long_name": "AAC (Advanced Audio Coding)",
 "profile": "LC",
 "codec_type": "audio",
 "codec_time_base": "1/48000",
 "codec_tag_string": "mp4a",
 "codec_tag": "0x6134706d",
 "sample_fmt": "fltp",
 "sample_rate": "48000",
 "channels": 6,
 "channel_layout": "5.1",
 "bits_per_sample": 0,
 "r_frame_rate": "0/0",
 "avg_frame_rate": "0/0",
 "time_base": "1/48000",
 "start_pts": 0,
 "start_time": "0.000000",
 "duration_ts": 388516320,
 "duration": "8094.090000",
 "bit_rate": "224000",
 "max_bit_rate": "224000",
 "nb_frames": "379413",
 "disposition": {
 "default": 1,
 "dub": 0,
 "original": 0,
 "comment": 0,
 "lyrics": 0,
 "karaoke": 0,
 "forced": 0,
 "hearing_impaired": 0,
 "visual_impaired": 0,
 "clean_effects": 0,
 "attached_pic": 0,
 "timed_thumbnails": 0
 },
 "tags": {
 "creation_time": "2020-03-27T09:56:39.000000Z",
 "language": "eng",
 "handler_name": "SoundHandler"
 }
 }
 ]
}



For what I can see, the codecs are the same, and the only difference I can make is in the aspect ratio.



What could be the reason for this "MEDIA_UNKNOWN" error on the chromecast side ? Is there something more I could compare between those two videos ? Could it be that the chromecast fails because of the aspect ratio ?


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How to accurately detect the start of the main beat and soundtracks in diverse audio tracks ?
18 juin 2024, par SnoofFloofI'm working on a project where I need to edit soundtracks. The challenge is to detect when the main beat and melody of any given soundtrack is properly developed. I am certain there is better terminology to describe what I am aiming for, but ideally, I want to skip the "build-up" and immediately have the song starting at the "main part". This needs to work for various songs across different genres, which often have different structures and onset patterns, making it difficult to streamline the process.


For example :


https://www.youtube.com/watch?v=P77CNtHrnmI -> I would want to my code to identify the onset at 0:24


https://www.youtube.com/watch?v=OOsPCR8SyRo -> Onset detection at 0:12


https://www.youtube.com/watch?v=XKiZBlelIzc -> Onset detection at 0:19


I've tried using librosa to analyze the onset strength and detect beats, but the current implementation either detects the very beginning of the song or fails to consistently identify when the beat is fully developed.


This was my approach ;


def analyze_and_edit_audio(input_file, output_file):
 y, sr = librosa.load(input_file)
 tempo, beat_frames = librosa.beat.beat_track(y=y, sr=sr)
 beat_times = librosa.frames_to_time(beat_frames, sr=sr)
 main_beat_start = beat_times[0]


I have very little experience with librosa/audio editing, so I would appreciate any suggestions you might have !


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Converting mp3 files to ogg vorbis while retaining cover art using FFmpeg
22 juin 2017, par refi64Title says it all. I’ve tried :
ffmpeg -i 01_FFXV_OST.mp3 -c:a libvorbis 01_FFXV_OST.oggbut I get :
ffmpeg version git-2017-01-22-f1214ad Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab --enable-libwavpack --enable-nvenc
libavutil 55. 44.100 / 55. 44.100
libavcodec 57. 75.100 / 57. 75.100
libavformat 57. 63.100 / 57. 63.100
libavdevice 57. 2.100 / 57. 2.100
libavfilter 6. 69.100 / 6. 69.100
libavresample 3. 2. 0 / 3. 2. 0
libswscale 4. 3.101 / 4. 3.101
libswresample 2. 4.100 / 2. 4.100
libpostproc 54. 2.100 / 54. 2.100
Input #0, mp3, from '01_FFXV_OST.mp3':
Metadata:
album : FINAL FANTASY XV Original Soundtrack
artist : Yoko Shimomura
album_artist : SQUARE ENIX MUSIC
composer : Yoko Shimomura
disc : 1
genre : Game
title : Somnus (Instrumental Version)
track : 01
date : 2016
Duration: 00:02:29.47, start: 0.023021, bitrate: 306 kb/s
Stream #0:0: Audio: mp3, 48000 Hz, stereo, s16p, 301 kb/s
Metadata:
encoder : LAME3.98r
Stream #0:1: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 500x500 [SAR 100:100 DAR 1:1], 90k tbr, 90k tbn, 90k tbc
Metadata:
comment : Cover (front)
Automatic encoder selection failed for output stream #0:0. Default encoder for format ogg (codec theora) is probably disabled. Please choose an encoder manually.
Error selecting an encoder for stream 0:0Adding on
-c:v copydoes...nothing :ffmpeg version git-2017-01-22-f1214ad Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab --enable-libwavpack --enable-nvenc
libavutil 55. 44.100 / 55. 44.100
libavcodec 57. 75.100 / 57. 75.100
libavformat 57. 63.100 / 57. 63.100
libavdevice 57. 2.100 / 57. 2.100
libavfilter 6. 69.100 / 6. 69.100
libavresample 3. 2. 0 / 3. 2. 0
libswscale 4. 3.101 / 4. 3.101
libswresample 2. 4.100 / 2. 4.100
libpostproc 54. 2.100 / 54. 2.100
Input #0, mp3, from '01_FFXV_OST.mp3':
Metadata:
album : FINAL FANTASY XV Original Soundtrack
artist : Yoko Shimomura
album_artist : SQUARE ENIX MUSIC
composer : Yoko Shimomura
disc : 1
genre : Game
title : Somnus (Instrumental Version)
track : 01
date : 2016
Duration: 00:02:29.47, start: 0.023021, bitrate: 306 kb/s
Stream #0:0: Audio: mp3, 48000 Hz, stereo, s16p, 301 kb/s
Metadata:
encoder : LAME3.98r
Stream #0:1: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 500x500 [SAR 100:100 DAR 1:1], 90k tbr, 90k tbn, 90k tbc
Metadata:
comment : Cover (front)
[ogg @ 0x2ac6e00] Unsupported codec id in stream 0
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Stream mapping:
Stream #0:1 -> #0:0 (copy)
Stream #0:0 -> #0:1 (mp3 (native) -> vorbis (libvorbis))
Last message repeated 1 timesI have absolutely no clue what to do next. I’ve also tried adding
-c:v copyto no avail :ffmpeg version git-2017-01-22-f1214ad Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab --enable-libwavpack --enable-nvenc
libavutil 55. 44.100 / 55. 44.100
libavcodec 57. 75.100 / 57. 75.100
libavformat 57. 63.100 / 57. 63.100
libavdevice 57. 2.100 / 57. 2.100
libavfilter 6. 69.100 / 6. 69.100
libavresample 3. 2. 0 / 3. 2. 0
libswscale 4. 3.101 / 4. 3.101
libswresample 2. 4.100 / 2. 4.100
libpostproc 54. 2.100 / 54. 2.100
Input #0, mp3, from '01_FFXV_OST.mp3':
Metadata:
album : FINAL FANTASY XV Original Soundtrack
artist : Yoko Shimomura
album_artist : SQUARE ENIX MUSIC
composer : Yoko Shimomura
disc : 1
genre : Game
title : Somnus (Instrumental Version)
track : 01
date : 2016
Duration: 00:02:29.47, start: 0.023021, bitrate: 306 kb/s
Stream #0:0: Audio: mp3, 48000 Hz, stereo, s16p, 301 kb/s
Metadata:
encoder : LAME3.98r
Stream #0:1: Video: mjpeg, yuvj444p(pc, bt470bg/unknown/unknown), 500x500 [SAR 100:100 DAR 1:1], 90k tbr, 90k tbn, 90k tbc
Metadata:
comment : Cover (front)
[ogg @ 0x2b6ce00] Unsupported codec id in stream 0
Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument
Stream mapping:
Stream #0:1 -> #0:0 (copy)
Stream #0:0 -> #0:1 (mp3 (native) -> vorbis (libvorbis))
Last message repeated 1 timesI get the same results if I change the stream order (by passing
-map 0:0 -map 0:1). I’m not sure what to do next...
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