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La file d’attente de SPIPmotion
28 novembre 2010, parUne file d’attente stockée dans la base de donnée
Lors de son installation, SPIPmotion crée une nouvelle table dans la base de donnée intitulée spip_spipmotion_attentes.
Cette nouvelle table est constituée des champs suivants : id_spipmotion_attente, l’identifiant numérique unique de la tâche à traiter ; id_document, l’identifiant numérique du document original à encoder ; id_objet l’identifiant unique de l’objet auquel le document encodé devra être attaché automatiquement ; objet, le type d’objet auquel (...) -
Contribute to documentation
13 avril 2011Documentation is vital to the development of improved technical capabilities.
MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
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Selection of projects using MediaSPIP
2 mai 2011, parThe examples below are representative elements of MediaSPIP specific uses for specific projects.
MediaSPIP farm @ Infini
The non profit organizationInfini develops hospitality activities, internet access point, training, realizing innovative projects in the field of information and communication technologies and Communication, and hosting of websites. It plays a unique and prominent role in the Brest (France) area, at the national level, among the half-dozen such association. Its members (...)
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Attribution Tracking (What It Is and How It Works)
23 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
-
6 Crucial Benefits of Conversion Rate Optimisation
26 février 2024, par Erin