
Recherche avancée
Médias (3)
-
MediaSPIP Simple : futur thème graphique par défaut ?
26 septembre 2013, par
Mis à jour : Octobre 2013
Langue : français
Type : Video
-
GetID3 - Bloc informations de fichiers
9 avril 2013, par
Mis à jour : Mai 2013
Langue : français
Type : Image
-
GetID3 - Boutons supplémentaires
9 avril 2013, par
Mis à jour : Avril 2013
Langue : français
Type : Image
Autres articles (35)
-
Les tâches Cron régulières de la ferme
1er décembre 2010, parLa gestion de la ferme passe par l’exécution à intervalle régulier de plusieurs tâches répétitives dites Cron.
Le super Cron (gestion_mutu_super_cron)
Cette tâche, planifiée chaque minute, a pour simple effet d’appeler le Cron de l’ensemble des instances de la mutualisation régulièrement. Couplée avec un Cron système sur le site central de la mutualisation, cela permet de simplement générer des visites régulières sur les différents sites et éviter que les tâches des sites peu visités soient trop (...) -
Ajouter notes et légendes aux images
7 février 2011, parPour pouvoir ajouter notes et légendes aux images, la première étape est d’installer le plugin "Légendes".
Une fois le plugin activé, vous pouvez le configurer dans l’espace de configuration afin de modifier les droits de création / modification et de suppression des notes. Par défaut seuls les administrateurs du site peuvent ajouter des notes aux images.
Modification lors de l’ajout d’un média
Lors de l’ajout d’un média de type "image" un nouveau bouton apparait au dessus de la prévisualisation (...) -
Emballe médias : à quoi cela sert ?
4 février 2011, parCe plugin vise à gérer des sites de mise en ligne de documents de tous types.
Il crée des "médias", à savoir : un "média" est un article au sens SPIP créé automatiquement lors du téléversement d’un document qu’il soit audio, vidéo, image ou textuel ; un seul document ne peut être lié à un article dit "média" ;
Sur d’autres sites (3790)
-
6 Crucial Benefits of Conversion Rate Optimisation
26 février 2024, par Erin -
When I use ffmpeg to go from a video to frames, and then back to video, the duration is different between the videos
24 février 2024, par bluepandaI am trying to use
ffmpeg
to convert from a .mp4 (or .mov) video into individual frames, do some processing on those frames, and then convert back to .mp4. The problem is that the resulting video I create is a different duration than the input - I can see this visually when I play the two videos side by side. The difference is not large (i.e.00:00:00.50
for the input video and00:00:00.52
for the output video), but when the videos are looped next to each other they get out of sync.

Here is information about the input video retrieved using
fluent-ffmpeg
'sffmpeg.ffprobe(videoPath)
:

metadata {
 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_tag_string: 'avc1',
 codec_tag: '0x31637661',
 width: 1080,
 height: 1920,
 coded_width: 1080,
 coded_height: 1920,
 closed_captions: 0,
 has_b_frames: 2,
 sample_aspect_ratio: 'N/A',
 display_aspect_ratio: 'N/A',
 pix_fmt: 'yuv420p',
 level: 40,
 color_range: 'tv',
 color_space: 'bt709',
 color_transfer: 'bt709',
 color_primaries: 'bt709',
 chroma_location: 'left',
 field_order: 'unknown',
 refs: 1,
 is_avc: 'true',
 nal_length_size: 4,
 id: 'N/A',
 r_frame_rate: '30000/1001',
 avg_frame_rate: '27000/1001',
 time_base: '1/30000',
 start_pts: 0,
 start_time: 0,
 duration_ts: 15100,
 duration: 0.503333,
 bit_rate: 5660223,
 max_bit_rate: 'N/A',
 bits_per_raw_sample: 8,
 nb_frames: 36,
 nb_read_frames: 'N/A',
 nb_read_packets: 'N/A',
 tags: [Object],
 disposition: [Object]
 },
 {
 index: 1,
 codec_name: 'aac',
 codec_long_name: 'AAC (Advanced Audio Coding)',
 profile: 'LC',
 codec_type: 'audio',
 codec_tag_string: 'mp4a',
 codec_tag: '0x6134706d',
 sample_fmt: 'fltp',
 sample_rate: 48000,
 channels: 2,
 channel_layout: 'stereo',
 bits_per_sample: 0,
 id: 'N/A',
 r_frame_rate: '0/0',
 avg_frame_rate: '0/0',
 time_base: '1/48000',
 start_pts: 0,
 start_time: 0,
 duration_ts: 24160,
 duration: 0.503333,
 bit_rate: 248416,
 max_bit_rate: 'N/A',
 bits_per_raw_sample: 'N/A',
 nb_frames: 27,
 nb_read_frames: 'N/A',
 nb_read_packets: 'N/A',
 tags: [Object],
 disposition: [Object]
 }
 ],
 format: {
 filename: '/Users/name/images/input.mp4',
 nb_streams: 2,
 nb_programs: 0,
 format_name: 'mov,mp4,m4a,3gp,3g2,mj2',
 format_long_name: 'QuickTime / MOV',
 start_time: 0,
 duration: 0.503333,
 size: 963879,
 bit_rate: 15319941,
 probe_score: 100,
 tags: {
 major_brand: 'mp42',
 minor_version: '1',
 compatible_brands: 'isommp41mp42',
 creation_time: '2024-02-14T01:21:12.000000Z'
 }
 },
 chapters: []
}



and here is from running
ffprobe
directly :

ffprobe '/Users/name/images/input.mp4'
ffprobe version 6.1.1 Copyright (c) 2007-2023 the FFmpeg developers
 built with Apple clang version 15.0.0 (clang-1500.1.0.2.5)
 configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/6.1.1_2 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags='-Wl,-ld_classic' --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libharfbuzz --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libssh --enable-libsvtav1 --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-libopenvino --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox --enable-neon
 libavutil 58. 29.100 / 58. 29.100
 libavcodec 60. 31.102 / 60. 31.102
 libavformat 60. 16.100 / 60. 16.100
 libavdevice 60. 3.100 / 60. 3.100
 libavfilter 9. 12.100 / 9. 12.100
 libswscale 7. 5.100 / 7. 5.100
 libswresample 4. 12.100 / 4. 12.100
 libpostproc 57. 3.100 / 57. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/name/images/input.mp4':
 Metadata:
 major_brand : mp42
 minor_version : 1
 compatible_brands: isommp41mp42
 creation_time : 2024-02-14T01:21:12.000000Z
 Duration: 00:00:00.50, start: 0.000000, bitrate: 15319 kb/s
 Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1080x1920, 5660 kb/s, 26.97 fps, 29.97 tbr, 30k tbn (default)
 Metadata:
 creation_time : 2024-02-14T01:21:12.000000Z
 handler_name : Core Media Video
 vendor_id : [0][0][0][0]
 encoder : AVC Coding
 Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 248 kb/s (default)
 Metadata:
 creation_time : 2024-02-14T01:21:12.000000Z
 handler_name : Core Media Audio
 vendor_id : [0][0][0][0]



And this is my command to go from video to frames :


ffmpeg -i /Users/name/images/input.mp4 -y -f image2 /Users/name/images/frames/%d.png



After which I convert the frames back to video with this - note that I get by seeing
avg_frame_rate
is27000/1001 = 26.97302697
:

ffmpeg -r 26.973026973026972 -i /Users/name/images/frames/%d.png -y -r 26.973026973026972 -b:v 5660223k -f mp4 -pix_fmt yuv420p -t 0.503333 /Users/name/images/output.mp4



And if I then run
fluent-ffmpeg
'sffmpeg.ffprobe(videoPath)
I get :

metadata {
 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_tag_string: 'avc1',
 codec_tag: '0x31637661',
 width: 1080,
 height: 1920,
 coded_width: 1080,
 coded_height: 1920,
 closed_captions: 0,
 has_b_frames: 2,
 sample_aspect_ratio: '1:1',
 display_aspect_ratio: '9:16',
 pix_fmt: 'yuv420p',
 level: 62,
 color_range: 'unknown',
 color_space: 'unknown',
 color_transfer: 'unknown',
 color_primaries: 'unknown',
 chroma_location: 'left',
 field_order: 'unknown',
 refs: 1,
 is_avc: 'true',
 nal_length_size: 4,
 id: 'N/A',
 r_frame_rate: '27000/1001',
 avg_frame_rate: '27000/1001',
 time_base: '1/27000',
 start_pts: 0,
 start_time: 0,
 duration_ts: 14014,
 duration: 0.519037,
 bit_rate: 52138429,
 max_bit_rate: 'N/A',
 bits_per_raw_sample: 8,
 nb_frames: 14,
 nb_read_frames: 'N/A',
 nb_read_packets: 'N/A',
 tags: [Object],
 disposition: [Object]
 }
 ],
 format: {
 filename: '/Users/name/images/output.mp4',
 nb_streams: 1,
 nb_programs: 0,
 format_name: 'mov,mp4,m4a,3gp,3g2,mj2',
 format_long_name: 'QuickTime / MOV',
 start_time: 0,
 duration: 0.52,
 size: 3383708,
 bit_rate: 52057046,
 probe_score: 100,
 tags: {
 major_brand: 'isom',
 minor_version: '512',
 compatible_brands: 'isomiso2avc1mp41',
 encoder: 'Lavf60.3.100'
 }
 },
 chapters: []
}



and here is from running
ffprobe
directly :

ffprobe '/Users/name/images/output.mp4'
ffprobe version 6.1.1 Copyright (c) 2007-2023 the FFmpeg developers
 built with Apple clang version 15.0.0 (clang-1500.1.0.2.5)
 configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/6.1.1_2 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags='-Wl,-ld_classic' --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libharfbuzz --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libssh --enable-libsvtav1 --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-libopenvino --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox --enable-neon
 libavutil 58. 29.100 / 58. 29.100
 libavcodec 60. 31.102 / 60. 31.102
 libavformat 60. 16.100 / 60. 16.100
 libavdevice 60. 3.100 / 60. 3.100
 libavfilter 9. 12.100 / 9. 12.100
 libswscale 7. 5.100 / 7. 5.100
 libswresample 4. 12.100 / 4. 12.100
 libpostproc 57. 3.100 / 57. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/name/images/output.mp4':
 Metadata:
 major_brand : isom
 minor_version : 512
 compatible_brands: isomiso2avc1mp41
 encoder : Lavf60.3.100
 Duration: 00:00:00.52, start: 0.000000, bitrate: 52153 kb/s
 Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(progressive), 1080x1920 [SAR 1:1 DAR 9:16], 52138 kb/s, 26.97 fps, 26.97 tbr, 27k tbn (default)
 Metadata:
 handler_name : VideoHandler
 vendor_id : [0][0][0][0]
 encoder : Lavc60.3.100 libx264



This seems like it should be a fairly common scenario, but I have not been able to find examples of this, and the other questions about incorrect durations on Stack Overflow are about bigger differences (i.e. 3 seconds instead of 10 seconds : Wrong video duration when recording with ffmpeg).


Some other details :


- 

- I am running this through a Node.js script with
fluent-ffmpeg
, but I have also tried running the commands directly in the terminal and the result is the same. - I am fine with the output frames being .png / .jpg / other formats.
- I am fine with setting this to a different frame rate than the original as long as the two output videos end up with the same duration.
- One suspicious thing is that I set
-t 0.503333
when creating the video, but it doesn't seem to work as the result video showsduration: 0.519037
/00:00:00.52
.










Thank you for any help !


- I am running this through a Node.js script with
-
Attribution Tracking (What It Is and How It Works)
23 février 2024, par Erin