
Recherche avancée
Médias (1)
-
Revolution of Open-source and film making towards open film making
6 octobre 2011, par
Mis à jour : Juillet 2013
Langue : English
Type : Texte
Autres articles (46)
-
Les autorisations surchargées par les plugins
27 avril 2010, parMediaspip core
autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs -
Soumettre améliorations et plugins supplémentaires
10 avril 2011Si vous avez développé une nouvelle extension permettant d’ajouter une ou plusieurs fonctionnalités utiles à MediaSPIP, faites le nous savoir et son intégration dans la distribution officielle sera envisagée.
Vous pouvez utiliser la liste de discussion de développement afin de le faire savoir ou demander de l’aide quant à la réalisation de ce plugin. MediaSPIP étant basé sur SPIP, il est également possible d’utiliser le liste de discussion SPIP-zone de SPIP pour (...) -
HTML5 audio and video support
13 avril 2011, parMediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
For older browsers the Flowplayer flash fallback is used.
MediaSPIP allows for media playback on major mobile platforms with the above (...)
Sur d’autres sites (6078)
-
Ffmpeg error splitting into individual encoded frames
19 avril 2021, par Vainmonde De CourtenayI have a folder of
.png
images I wanted to make a series of.h264
frames (one frame per.png
). The frames are namedframe001.png
,frame002.png
, ...

First inside the folder containing the .png files I ran


ffmpeg -r 10 -i frame%3d.png -codec libx264 -r 10 video.h264 -y



which did its job, generating one
video.h264
. But now I want to divide that into many smaller .h264 files. Following this advice I tried

ffmpeg -i video.h264 -f image2 -vcodec copy -bsf h264_mp4toannexb frame%03d.h264



but I hit error


[image2 @ 0x55d2fc1f7b20] Application provided invalid, non monotonically increasing dts to muxer in stream 0: -2 >= -2



Full console debug :


# ffmpeg -i video.h264 -f image2 -vcodec copy -bsf h264_mp4toannexb fr%03d.h264
ffmpeg version 3.4.8-0ubuntu0.2 Copyright (c) 2000-2020 the FFmpeg developers
 built with gcc 7 (Ubuntu 7.5.0-3ubuntu1~18.04)
 configuration: --prefix=/usr --extra-version=0ubuntu0.2 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
 libavutil 55. 78.100 / 55. 78.100
 libavcodec 57.107.100 / 57.107.100
 libavformat 57. 83.100 / 57. 83.100
 libavdevice 57. 10.100 / 57. 10.100
 libavfilter 6.107.100 / 6.107.100
 libavresample 3. 7. 0 / 3. 7. 0
 libswscale 4. 8.100 / 4. 8.100
 libswresample 2. 9.100 / 2. 9.100
 libpostproc 54. 7.100 / 54. 7.100
Input #0, h264, from 'video.h264':
 Duration: N/A, bitrate: N/A
 Stream #0:0: Video: h264 (High 4:4:4 Predictive), yuv444p(progressive), 480x852, 10 fps, 10 tbr, 1200k tbn, 20 tbc
Output #0, image2, to 'fr%03d.h264':
 Metadata:
 encoder : Lavf57.83.100
 Stream #0:0: Video: h264 (High 4:4:4 Predictive), yuv444p(progressive), 480x852, q=2-31, 10 fps, 10 tbr, 10 tbn, 10 tbc
Stream mapping:
 Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[image2 @ 0x55d2fc1f7b20] Application provided invalid, non monotonically increasing dts to muxer in stream 0: -2 >= -2
frame= 28 fps=0.0 q=-1.0 Lsize=N/A time=00:00:02.50 bitrate=N/A speed=1.58e+03x 
video:142kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown



I have tried the problem with multiple videos and the same thing. In fact when I check, the new files do appear. But they aren't really .h264's (just a few bytes large - appear to be ghost files) and I'm guessing this is down to the error displayed above.


-
How can I broadcast a Twilio (group room) video conference ?
2 novembre 2022, par DanishI have been trying different solutions/approaches for last few days and posting here to get some more options.



I am planning to use Twilio's Programmable Video solution with Group room (upto 50 participants) to allow hosts/presenters to join video conference meeting. Right now I am able to setup and get started with quickstart example here



Also, in parallel, I need to be able to broadcast that live meeting room through RTMP/HLS (audio+video) streaming that can be viewed (through another portal) by large user set (ideally around 10k+)



Twilio support team suggested - integrating Twilio Video with Wowza using screenscrapping and ffmpeg (i.e. render the video into a (maybe virtual) screen, capture it and send to Wowza using ffmpeg.)



I am new to both ffmpeg and wowza. However, I am looking to see high level solution which can be used to achieve this (with minimum hanging parts).



Ideal flow i can think of is



- 

- Start a Twilio video conference room with actual presenters
- all participants share there video and audio tracks with each other in the room - standard behavior
- a new ghost-participant joins-in from stand-alone server (from wowza or SIP) and subscribes to audio-video tracks in conference.
- arrange & combine those tracks into one channel and stream it as HLS
- this ghost-participant will also be able to identify dominant speaker and re-arrange video tracks to show current speaker occupying bigger space (just like zoom)
- and of course, this streamed video (with audio) will be one-way and viewers cannot interact. Just see be able to see the room broadcasting.















Also/FYI
I have tried exploring few more options below (with no success)



- 

-
a blog here explain how can we broadcast a twilio audio
conference. At the bottom it also mention about video streaming. but, I am not getting how can we use SIP to get video stream that can be broadcasted. Also, how can I manipulate video tracks to show dominant speakers in full screen view Vs other participant in thumbnail view i.e. custom layouts.
-
I also explored option of Wowza WebRTC streaming to achieve this, but it has got other technical challenges with setting up video room with multiple participants. I am going to reach out to them to see if this use-case is possible with their offering.
-
I am looking for something as simple as here - dial as guest participant into video room from standalone streaming server/wowza server. And get output as single stream to broadcast.









Any other pointers or links to solutions would be helpful.


-
avfilter/vf_framerate : simplify filter
19 décembre 2017, par Marton Balintavfilter/vf_framerate : simplify filter
The framerate filter was quite convoluted with some filter_frame /
request_frame logic bugs. It seemed easier to rewrite the whole filter_frame /
request_frame part and also the frame interpolation ratio calculation part in
one step.Notable changes :
The filter now only stores 2 frames instead of 3
filter_frame outputs all the frames it can to be able to handle consecutive
filter_frame calls which previously caused early drops of buffered frames.because of this, request_frame is largely simplified and it only outputs
frames on flush. Previously consecuitve request_frame calls could cause the
filter to think it is in flush mode filling its buffer with the same frames
causing a "ghost" effect on the output.PTS discontinuities are handled better
frames with unknown PTS values are now dropped
Fixes ticket #4870.
Probably fixes ticket #5493.Signed-off-by : Marton Balint <cus@passwd.hu>