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Autres articles (51)

  • Websites made ​​with MediaSPIP

    2 mai 2011, par

    This page lists some websites based on MediaSPIP.

  • Creating farms of unique websites

    13 avril 2011, par

    MediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
    This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...)

  • Other interesting software

    13 avril 2011, par

    We don’t claim to be the only ones doing what we do ... and especially not to assert claims to be the best either ... What we do, we just try to do it well and getting better ...
    The following list represents softwares that tend to be more or less as MediaSPIP or that MediaSPIP tries more or less to do the same, whatever ...
    We don’t know them, we didn’t try them, but you can take a peek.
    Videopress
    Website : http://videopress.com/
    License : GNU/GPL v2
    Source code : (...)

Sur d’autres sites (7051)

  • Decoding RIMM streaming file format

    10 septembre 2011, par Thomas

    I want to decode the video (visual) frames within a Blackberry RIMM file. So far I have a parser, and some corresponding container documentation from RIM. 

    The video codec is H264 and is explicitly set on the device using one of the video.encodings properties. However, FFMPEG is not able to decode the frames and this is driving me nuts.

    Edit 1 : The issues seems to be lack of SPS and PPS in the frames, and artificially inserting them have proven unsuccessful so far (all grey image). Blackberry 9700 sends

    0x00 0x00 0x ?? 0x ?? 0xType

    where Type is according to table 7-1 in the H264 spec (I and P frames). We believe the 0x ?? 0x ?? represent the size of the frame, however the size does not always correspond to the size found by the parser (the parser seems to be working correctly).

    I have a windows decoder codec from blackberry, called mc_demux_mp2_ds.ax, and can play some MPEG-4 files captured the same way, but it is a binary for windows. And the H264 files will not play either way. I am aware of previous attempts. The capture url for javax.microedition.media.Manager is

    encoding=video-3gpp_width=176_height=144_video_codec=H264_audio_codec=AAC

    and I am writing to an output stream. Some example files here.

    Edit 2 :Turns out that about 3-4 of the 12-15 available video capture modes are flat out failing and refusing to output data, even in the simplest of test applications. So any working solution should implement MPEG-4, H264 and H263 in both AMR and AAC, in so getting fallback alternatives when one sound codec and/or resolution fails. Reboots, hangs and what not litters the Blackberry video implementation and vary from firmware to firmware ; total suckage.

  • Ruby on Rails - Paperclip - ffmpeg - throws error when adding style to "has_attached_file"

    4 octobre 2018, par TamerB

    I’m working on image and video upload in a rails app using paperclip and ffmpeg.

    The following code in models/image.rb is working fine :

    has_attached_file :image,
    
processors: [:ffmpeg]
    
validates_attachment_content_type :image, content_type: /.*/

    But, when I add styling to the code as follows, it throws an error on (page loading) :

    has_attached_file :image, styles: lambda {|a| if a.instance.is_image? then {original: {}, medium: "300x300>"} end},
    
processors: [:ffmpeg]
    
validates_attachment_content_type :image, content_type: /.*/
    

    
def is_image?
    
  return false unless @attachment_image.content_type
    
  ['image/jpeg', 'image/pjpeg', 'image/gif', 'image/png', 'image/x-png', 'image/jpg'].include?(@attachment_image.content_type)
    
end

    The error is as follows :

    F, [2018-10-04T15:04:47.381706 #9836] FATAL -- : [643e7428-d41e-4000-9a48-566d85e7b109]   
    
F, [2018-10-04T15:04:47.381906 #9836] FATAL -- : [643e7428-d41e-4000-9a48-566d85e7b109] ActionView::Template::Error (undefined method `each_pair' for nil:NilClass):
    
F, [2018-10-04T15:04:47.382186 #9836] FATAL -- : [643e7428-d41e-4000-9a48-566d85e7b109]     1: insert_tag renderer_for(:show)
    
F, [2018-10-04T15:04:47.382345 #9836] FATAL -- : [643e7428-d41e-4000-9a48-566d85e7b109]   
    
F, [2018-10-04T15:04:47.382441 #9836] FATAL -- : [643e7428-d41e-4000-9a48-566d85e7b109] app/admin/resorts.rb:46:in `block (5 levels) in <top>'
    
</top>

    How can I solve this ?

    Update

    This error is displayed only when trying to upload a video or or trying to load a page containing a video.

    The code in pp/admin/resorts.rb mentioned in the error message is the following (I’m using activeadmin gem) :

    if im.itype == 'video-slider' then
    
    video_tag im.image, class: 'my_image_size' # line 46
    
else
    
    image_tag im.image, class: 'my_image_size'
    
end

    When trying to upload an image, the error changed to be as follows () :

    Input #0, image2, from '/tmp/dcdc7c452102ec2b9255973f59b40ee320181004-23173-fx7vzi.jpg':
    
Duration: 00:00:00.04, start: 0.000000, bitrate: 35614 kb/s
    
Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1920x1080, 25 tbr, 25 tbn, 25 tbc
    
[NULL @ 0x564aeb7df580] Unable to find a suitable output format for '/tmp/dcdc7c452102ec2b9255973f59b40ee320181004-23173-fx7vzi20181004-23173-zurkvx'
    
/tmp/dcdc7c452102ec2b9255973f59b40ee320181004-23173-fx7vzi20181004-23173-zurkvx: Invalid argument
    
):
    
F, [2018-10-04T19:13:02.028565 #23173] FATAL -- : [c267e57b-7e06-4624-be1c-0d9aa4b71e00]   
    
F, [2018-10-04T19:13:02.028730 #23173] FATAL -- : [c267e57b-7e06-4624-be1c-0d9aa4b71e00] paperclip-ffmpeg (1.2.0) lib/paperclip_processors/ffmpeg.rb:175:in `rescue in make'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] paperclip-ffmpeg (1.2.0) lib/paperclip_processors/ffmpeg.rb:171:in `make'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] paperclip (5.2.1) lib/paperclip/processor.rb:34:in `make'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] paperclip (5.2.1) lib/paperclip/attachment.rb:533:in `block in post_process_style'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] paperclip (5.2.1) lib/paperclip/attachment.rb:532:in `each'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] paperclip (5.2.1) lib/paperclip/attachment.rb:532:in `reduce'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] paperclip (5.2.1) lib/paperclip/attachment.rb:532:in `post_process_style'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] paperclip (5.2.1) lib/paperclip/attachment.rb:519:in `post_process_styles'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] paperclip (5.2.1) lib/paperclip/attachment.rb:512:in `block (2 levels) in post_process'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activesupport (5.1.5) lib/active_support/callbacks.rb:131:in `run_callbacks'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] paperclip (5.2.1) lib/paperclip/callbacks.rb:38:in `run_paperclip_callbacks'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] paperclip (5.2.1) lib/paperclip/attachment.rb:510:in `block in post_process'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activesupport (5.1.5) lib/active_support/callbacks.rb:97:in `run_callbacks'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] paperclip (5.2.1) lib/paperclip/callbacks.rb:38:in `run_paperclip_callbacks'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] paperclip (5.2.1) lib/paperclip/attachment.rb:509:in `post_process'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] paperclip (5.2.1) lib/paperclip/attachment.rb:465:in `post_process_file'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] paperclip (5.2.1) lib/paperclip/attachment.rb:113:in `assign'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] paperclip (5.2.1) lib/paperclip/has_attached_file.rb:66:in `block in define_setter'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activemodel (5.1.5) lib/active_model/attribute_assignment.rb:46:in `public_send'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activemodel (5.1.5) lib/active_model/attribute_assignment.rb:46:in `_assign_attribute'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activemodel (5.1.5) lib/active_model/attribute_assignment.rb:40:in `block in _assign_attributes'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activemodel (5.1.5) lib/active_model/attribute_assignment.rb:39:in `each'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activemodel (5.1.5) lib/active_model/attribute_assignment.rb:39:in `_assign_attributes'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activerecord (5.1.5) lib/active_record/attribute_assignment.rb:26:in `_assign_attributes'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activemodel (5.1.5) lib/active_model/attribute_assignment.rb:33:in `assign_attributes'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activerecord (5.1.5) lib/active_record/core.rb:337:in `initialize'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activerecord (5.1.5) lib/active_record/inheritance.rb:66:in `new'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activerecord (5.1.5) lib/active_record/inheritance.rb:66:in `new'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activeadmin (1.1.0) lib/active_admin/resource_controller/data_access.rb:130:in `build_new_resource'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activeadmin (1.1.0) lib/active_admin/resource_controller/data_access.rb:116:in `build_resource'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] inherited_resources (1.8.0) lib/inherited_resources/actions.rb:31:in `create'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/action_controller/metal/basic_implicit_render.rb:4:in `send_action'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/abstract_controller/base.rb:186:in `process_action'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/action_controller/metal/rendering.rb:30:in `process_action'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activesupport (5.1.5) lib/active_support/callbacks.rb:131:in `run_callbacks'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/abstract_controller/callbacks.rb:19:in `process_action'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/action_controller/metal/rescue.rb:20:in `process_action'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/action_controller/metal/instrumentation.rb:32:in `block in process_action'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activesupport (5.1.5) lib/active_support/notifications.rb:166:in `block in instrument'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activesupport (5.1.5) lib/active_support/notifications/instrumenter.rb:21:in `instrument'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activesupport (5.1.5) lib/active_support/notifications.rb:166:in `instrument'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/action_controller/metal/params_wrapper.rb:252:in `process_action'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] searchkick (3.0.0) lib/searchkick/logging.rb:209:in `process_action'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activerecord (5.1.5) lib/active_record/railties/controller_runtime.rb:22:in `process_action'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/abstract_controller/base.rb:124:in `process'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionview (5.1.5) lib/action_view/rendering.rb:30:in `process'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/action_controller/metal.rb:189:in `dispatch'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/action_controller/metal.rb:253:in `dispatch'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/action_dispatch/routing/route_set.rb:49:in `dispatch'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/action_dispatch/routing/route_set.rb:31:in `serve'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/action_dispatch/journey/router.rb:50:in `block in serve'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/action_dispatch/journey/router.rb:33:in `each'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/action_dispatch/journey/router.rb:33:in `serve'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/action_dispatch/routing/route_set.rb:844:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] omniauth (1.8.1) lib/omniauth/strategy.rb:190:in `call!'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] omniauth (1.8.1) lib/omniauth/strategy.rb:168:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] omniauth (1.8.1) lib/omniauth/strategy.rb:190:in `call!'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] omniauth (1.8.1) lib/omniauth/strategy.rb:168:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] omniauth (1.8.1) lib/omniauth/strategy.rb:190:in `call!'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] omniauth (1.8.1) lib/omniauth/strategy.rb:168:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] warden (1.2.7) lib/warden/manager.rb:36:in `block in call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] warden (1.2.7) lib/warden/manager.rb:35:in `catch'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] warden (1.2.7) lib/warden/manager.rb:35:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] rack (2.0.5) lib/rack/etag.rb:25:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] rack (2.0.5) lib/rack/conditional_get.rb:38:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] rack (2.0.5) lib/rack/head.rb:12:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] rack (2.0.5) lib/rack/session/abstract/id.rb:232:in `context'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] rack (2.0.5) lib/rack/session/abstract/id.rb:226:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/action_dispatch/middleware/cookies.rb:613:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activerecord (5.1.5) lib/active_record/migration.rb:556:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/action_dispatch/middleware/callbacks.rb:26:in `block in call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activesupport (5.1.5) lib/active_support/callbacks.rb:97:in `run_callbacks'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/action_dispatch/middleware/callbacks.rb:24:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/action_dispatch/middleware/debug_exceptions.rb:59:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] web-console (3.5.1) lib/web_console/middleware.rb:135:in `call_app'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] web-console (3.5.1) lib/web_console/middleware.rb:28:in `block in call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] web-console (3.5.1) lib/web_console/middleware.rb:18:in `catch'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] web-console (3.5.1) lib/web_console/middleware.rb:18:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/action_dispatch/middleware/show_exceptions.rb:31:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] railties (5.1.5) lib/rails/rack/logger.rb:36:in `call_app'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] railties (5.1.5) lib/rails/rack/logger.rb:24:in `block in call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activesupport (5.1.5) lib/active_support/tagged_logging.rb:69:in `block in tagged'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activesupport (5.1.5) lib/active_support/tagged_logging.rb:26:in `tagged'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activesupport (5.1.5) lib/active_support/tagged_logging.rb:69:in `tagged'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] railties (5.1.5) lib/rails/rack/logger.rb:24:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] sprockets-rails (3.2.1) lib/sprockets/rails/quiet_assets.rb:13:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/action_dispatch/middleware/remote_ip.rb:79:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] request_store (1.4.0) lib/request_store/middleware.rb:19:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/action_dispatch/middleware/request_id.rb:25:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] rack (2.0.5) lib/rack/method_override.rb:22:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] rack (2.0.5) lib/rack/runtime.rb:22:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] activesupport (5.1.5) lib/active_support/cache/strategy/local_cache_middleware.rb:27:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/action_dispatch/middleware/executor.rb:12:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] actionpack (5.1.5) lib/action_dispatch/middleware/static.rb:125:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] rack (2.0.5) lib/rack/sendfile.rb:111:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] railties (5.1.5) lib/rails/engine.rb:522:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] puma (3.11.2) lib/puma/configuration.rb:225:in `call'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] puma (3.11.2) lib/puma/server.rb:624:in `handle_request'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] puma (3.11.2) lib/puma/server.rb:438:in `process_client'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] puma (3.11.2) lib/puma/server.rb:302:in `block in run'
    
[c267e57b-7e06-4624-be1c-0d9aa4b71e00] puma (3.11.2) lib/puma/thread_pool.rb:120:in `block in spawn_thread'

  • VP8 for Real-time Video Applications

    15 février 2011, par noreply@blogger.com (John Luther)

    With the growing interest in videoconferencing on the web platform, it’s a good time to explore the features of VP8 that make it an exceptionally good codec for real-time applications like videoconferencing.

    VP8 Design History & Features

    Real-time applications were a primary use case when VP8 was designed. The VP8 encoder has features specifically engineered to overcome the challenges inherent in compressing and transmitting real-time video data.

    • Processor-adaptive encoding. 16 encoder complexity levels automatically (or manually) adjust encoder features such as motion search strategy, quantizer optimizations, and loop filtering strength.
    • Encoder can be configured to use a target percentage of the host CPU.
      Ability to measure the time taken to encode each frame and adjust encoder complexity dynamically to keep the encoding time per frame constant
    • Robust error recovery (packet retransmission, forward error correction, recovery frame/new keyframe requests)
    • Temporal scalability (i.e., a single video bitstream that can degrade as needed depending on a participant’s available bandwidth)
    • Highly efficient decoding performance on low-power devices. Conventional video technology has grown to a state of complexity where dedicated hardware chips are needed to make it work well. With VP8, software-based solutions have proven to meet customer needs without requiring specialized hardware.

    For a more information about real-time video features in VP8, see the slide presentation by WebM Project engineer Paul Wilkins (PDF file).

    Commercially Available Products

    Millions of people around the world have been using VP7/8 for video chat for years. VP8 is deployed in some of today’s most popular consumer videoconferencing applications, including Skype (group video calling), Sightspeed, ooVoo and Logitech Vid. All of these vendors are active WebM project supporters. VP8’s predecessor, VP7, has been used in Skype video calling since 2005 and is supported in the new Skype app for iPhone. Other real-time VP8 implementations are coming soon, including ooVoo, and VP8 will play a leading role in Google’s plans for real-time applications on the web platform.

    Real-time applications will be extremely important as the web platform matures. The WebM community has made significant improvements in VP8 for real-time use cases since our launch and will continue to do so in the future.

    John Luther is Product Manager of the WebM Project.

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