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Géodiversité
9 septembre 2011, par ,
Mis à jour : Août 2018
Langue : français
Type : Texte
Autres articles (68)
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Websites made with MediaSPIP
2 mai 2011, parThis page lists some websites based on MediaSPIP.
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Participer à sa traduction
10 avril 2011Vous pouvez nous aider à améliorer les locutions utilisées dans le logiciel ou à traduire celui-ci dans n’importe qu’elle nouvelle langue permettant sa diffusion à de nouvelles communautés linguistiques.
Pour ce faire, on utilise l’interface de traduction de SPIP où l’ensemble des modules de langue de MediaSPIP sont à disposition. ll vous suffit de vous inscrire sur la liste de discussion des traducteurs pour demander plus d’informations.
Actuellement MediaSPIP n’est disponible qu’en français et (...) -
Installation en mode ferme
4 février 2011, parLe mode ferme permet d’héberger plusieurs sites de type MediaSPIP en n’installant qu’une seule fois son noyau fonctionnel.
C’est la méthode que nous utilisons sur cette même plateforme.
L’utilisation en mode ferme nécessite de connaïtre un peu le mécanisme de SPIP contrairement à la version standalone qui ne nécessite pas réellement de connaissances spécifique puisque l’espace privé habituel de SPIP n’est plus utilisé.
Dans un premier temps, vous devez avoir installé les mêmes fichiers que l’installation (...)
Sur d’autres sites (9985)
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Evolution #3784 : Validation automatique des messages de forum par un admin
19 février 2021, par Maïeul RouquettePour info, il y a un plugin qui fait presque cela https://contrib.spip.net/Moderation-Moderee
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Anomalie #4257 (Nouveau) : Impossible de lire certaines descriptions XML et validation XML bloquée...
28 décembre 2018Bonjour,
Dans la page ecrire/ ?exec=admin_plugin&actualise=1 j’ai un message d’erreur :
Erreurs survenues
Impossible de lire certaines descriptions XML
Erreur dans les plugins : auto/jeux/v3.4.1
Erreur dans les plugins : auto/mosaique/v0.5.1Les 2 erreurs sont des liens vers la validation XML :
/ecrire/ ?exec=valider_xml&var_url=http://spip31.pyrat.net/plugins/auto/jeux/v3.4.1/paquet.xmlMais ça donne une erreur 404 :
Error 403
You are not authorized to view this page (URL interdite pour var_url)Si je commente le code concerné dans config/ecren_securite.php (L373...)
J’ai une autre erreur :URL absolue interdite pour var_url
Ça passe si je fais :
ecrire/ ?exec=valider_xml&var_url=../plugins/auto/jeux/v3.4.1/paquet.xmlDocument qui est d’ailleurs valide
SPIP considère ce document comme conforme à son DOCTYPE :
N°
1Testé avec SPIP 3.2.1 SVN [24172] sous PHP Version 7.2.13 / Windows 10
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ffmpeg concat doesn't sync to manual frame by frame concatenation
5 juillet 2022, par memoI have hundreds of short (10-120seconds) videos (H264 mp4) with audio (aac). (let's call these 'clips'). All identical video and audio codecs, resolution, framerate, crf, pixel format, sample rate etc.


concat_demux :


If I concat these with ffmpeg concat (demuxer), I get a single nice H264 mp4 with audio perfectly synced to the video (as expected).


cmd_args = ['ffmpeg',
 '-f concat',
 '-safe 0',
 f'-i "{output_filelist_path}"',
 '-c copy',
 '-y',
 '-r 30', # trying this out of desperation
 f'"{output_concat_demux}"'
 ]

cmd = ' '.join(cmd_args)
r = subprocess.call(cmd, shell=True, cwd=args.output_dir)



frame_by_frame :


However, if I manually iterate every frame of every clip video and write the frames to an mp4 using skvideo.io, this video drifts out of sync with the concat_demux version.


input_dict = { '-r':str(fps) } 
output_dict = { '-r':str(fps), '-pix_fmt':'yuv420p', '-vcodec':'libx264', '-crf':'18' }
video_writer = skvideo.io.FFmpegWriter(output_path, inputdict=input_dict, outputdict=output_dict) 

for video_path in video_paths:
 video = skvideo.io.vread(video_path) # read all frames into np.array
 for frame in video:
 video_writer.writeFrame(frame)
video_writer.close()



When I compare these two files in a video editor (e.g. AfterEffects) and step through frame by frame, I can see that with every new clip, the frame_by_frame version slips 1 or 2 frames ahead of the ffmpeg concat_demux version. What is going on ? How can I fix - or at least debug - this ?


On a side note, I do need to concatenate manually frame by frame, as I'm also doing a ton of other stuff (triggering events on clip change, overlaying additional elements etc). And I need to be able to sync a concatenated audio. I was hoping to concatenate the video manually frame by frame and do my post-processing, and then mux with the audio from the ffmpeg concat_demux version. But alas they drift out of sync.



(I've found quite a few posts on SO where the problem is using ffmpeg concat results in videos which are out of sync with the audio. However, this is not my problem. My video created with ffmpeg concat is perfectly in sync with the audio, but it's out of sync with a manually frame-by-frame concatenated video.)



Update - concat_protocol


I've tried using the concat protocol. Now the output of this gives a file where the video is frame synced to the frame_by_frame version, BUT the audio is synced to the audio of the concat_demux version. So its audio is out of sync with the video.


intermediate_paths = []
for p in clip_file_list:
 intermediate_path = os.path.join(args.output_dir, 'intermediate', os.path.basename(p) + '.ts')
 intermediate_paths.append(intermediate_path)
 cmd_args = ['ffmpeg',
 f'-i "{p}"',
 '-c copy -bsf:v h264_mp4toannexb -f mpegts -y',
 f'"{intermediate_path}"'
 ]

 cmd = ' '.join(cmd_args)
 r = subprocess.call(cmd, shell=True, cwd=args.output_dir)


intermediate_paths = '|'.join(intermediate_paths)
cmd_args = ['ffmpeg',
 f'-i "concat:{intermediate_paths}"',
 '-c copy -bsf:a aac_adtstoasc',
 f'"{output_concat_path}"'
 ]

cmd = ' '.join(cmd_args)
r = subprocess.call(cmd, shell=True, cwd=args.output_dir)



I am getting loads of errors like below


corrupt input packet in stream 0
[mp4 @ 0x137e043d0] Non-monotonous DTS in output stream 0:1; previous: 83027966, current: 83027198; changing to 83027967. This may result in incorrect timestamps in the output file.




here's the info on the two output files. Input #0 is the ffmpeg concat_demux. Input #1 is the manual frame-by-frame. Note the concat.mp4 has a framerate of 29.94 fps. I'm not sure if this is the problem. I couldn't figure out how to make this 30 (see '-r 30' in the ffmpeg concat command above)


ffmpeg version 5.0.1 Copyright (c) 2000-2022 the FFmpeg developers
 built with Apple clang version 13.1.6 (clang-1316.0.21.2.5)
 configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/5.0.1_2 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-neon
 libavutil 57. 17.100 / 57. 17.100
 libavcodec 59. 18.100 / 59. 18.100
 libavformat 59. 16.100 / 59. 16.100
 libavdevice 59. 4.100 / 59. 4.100
 libavfilter 8. 24.100 / 8. 24.100
 libswscale 6. 4.100 / 6. 4.100
 libswresample 4. 3.100 / 4. 3.100
 libpostproc 56. 3.100 / 56. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'clips_concat.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf59.16.100
 Duration: 00:01:43.22, start: 0.000000, bitrate: 5412 kb/s
 Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1080x1080 [SAR 1:1 DAR 1:1], 5276 kb/s, 29.94 fps, 30 tbr, 15360 tbn (default)
 Metadata:
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]
 Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
 Metadata:
 handler_name : SoundHandler
 vendor_id : [0][0][0][0]
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'clips_frames.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf59.16.100
 Duration: 00:01:43.00, start: 0.000000, bitrate: 4917 kb/s
 Stream #1:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1080x1080, 4914 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
 Metadata:
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]




here's info on first few clips (the manual concat is already 2 frames out of sync with the ffmpeg concat version by the second clip !)


ffmpeg version 5.0.1 Copyright (c) 2000-2022 the FFmpeg developers
 built with Apple clang version 13.1.6 (clang-1316.0.21.2.5)
 configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/5.0.1_2 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-neon
 libavutil 57. 17.100 / 57. 17.100
 libavcodec 59. 18.100 / 59. 18.100
 libavformat 59. 16.100 / 59. 16.100
 libavdevice 59. 4.100 / 59. 4.100
 libavfilter 8. 24.100 / 8. 24.100
 libswscale 6. 4.100 / 6. 4.100
 libswresample 4. 3.100 / 4. 3.100
 libpostproc 56. 3.100 / 56. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'clip_1080px_0.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.29.100
 Duration: 00:00:05.02, start: 0.000000, bitrate: 3944 kb/s
 Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1080x1080 [SAR 1:1 DAR 1:1], 3818 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
 Metadata:
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]
 Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 131 kb/s (default)
 Metadata:
 handler_name : SoundHandler
 vendor_id : [0][0][0][0]
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'clip_1080px_1.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.29.100
 Duration: 00:00:05.02, start: 0.000000, bitrate: 4557 kb/s
 Stream #1:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1080x1080 [SAR 1:1 DAR 1:1], 4438 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
 Metadata:
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]
 Stream #1:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
 Metadata:
 handler_name : SoundHandler
 vendor_id : [0][0][0][0]
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'clip_1080px_2.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.29.100
 Duration: 00:00:11.02, start: 0.000000, bitrate: 5447 kb/s
 Stream #2:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1080x1080 [SAR 1:1 DAR 1:1], 5320 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
 Metadata:
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]
 Stream #2:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
 Metadata:
 handler_name : SoundHandler
 vendor_id : [0][0][0][0]
Input #3, mov,mp4,m4a,3gp,3g2,mj2, from 'clip_1080px_3.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.29.100
 Duration: 00:00:11.02, start: 0.000000, bitrate: 5978 kb/s
 Stream #3:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1080x1080 [SAR 1:1 DAR 1:1], 5851 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
 Metadata:
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]
 Stream #3:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
 Metadata:
 handler_name : SoundHandler
 vendor_id : [0][0][0][0]
Input #4, mov,mp4,m4a,3gp,3g2,mj2, from 'clip_1080px_4.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.29.100
 Duration: 00:00:16.02, start: 0.000000, bitrate: 6570 kb/s
 Stream #4:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1080x1080 [SAR 1:1 DAR 1:1], 6441 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
 Metadata:
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]
 Stream #4:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
 Metadata:
 handler_name : SoundHandler
 vendor_id : [0][0][0][0]
Input #5, mov,mp4,m4a,3gp,3g2,mj2, from 'clip_1080px_5.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.29.100
 Duration: 00:00:13.02, start: 0.000000, bitrate: 5069 kb/s
 Stream #5:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1080x1080 [SAR 1:1 DAR 1:1], 4940 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
 Metadata:
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]
 Stream #5:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
 Metadata:
 handler_name : SoundHandler
 vendor_id : [0][0][0][0]
Input #6, mov,mp4,m4a,3gp,3g2,mj2, from 'clip_1080px_6.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.29.100
 Duration: 00:00:22.02, start: 0.000000, bitrate: 4775 kb/s
 Stream #6:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1080x1080 [SAR 1:1 DAR 1:1], 4642 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
 Metadata:
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]
 Stream #6:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
 Metadata:
 handler_name : SoundHandler
 vendor_id : [0][0][0][0]
Input #7, mov,mp4,m4a,3gp,3g2,mj2, from 'clip_1080px_7.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf58.29.100
 Duration: 00:00:22.02, start: 0.000000, bitrate: 5402 kb/s
 Stream #7:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1080x1080 [SAR 1:1 DAR 1:1], 5269 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
 Metadata:
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]
 Stream #7:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
 Metadata:
 handler_name : SoundHandler
 vendor_id : [0][0][0][0]