Recherche avancée

Sur d’autres sites (5092)

• Anomalie #4375 : Tests unitaires en erreur

  24 octobre 2020, par Franck D

  Hello
  Juste pour dire que j’ai refait les tests en php 8 en mettant la proposition de b_b https://core.spip.net/issues/4579#note-2
  Windows 10 (1909)

  Laragon avec :
  Php 8.0.0RC2 (VS16 x64 Non Thread Safe) https://windows.php.net/qa
  Apache 2.4.46 Win64 avec mod_fcgid-2.3.10-win64-VS16 https://www.apachelounge.com/download/
  Mysql 8.0.22 (mysql-8.0.22-winx64.zip) https://dev.mysql.com/downloads/mysql/
  phpMyAdmin 5.0.4 https://www.phpmyadmin.net

  Prefix des tables à l’installation : "test1"
  SPIP 3.3.0-dev GIT [master : 08981b68]

  Cela donne 32 échecs dont le retour de sql_insert_select maintenant, ce n’est pas forcément "grave" dans le sens ou il y en a pas mal, avec https://core.spip.net/issues/4576 donc possible qu’en corrigeant Textwheel, le nombre d’échec se réduise considérablement

• question regarding ffmpeg webcam stream (RTMP)

  7 janvier 2021, par J Hwang

  I am a novice if you will regarding FFMPEG.
I was tasked with creating a Windows-based C++ project that takes a live webcam stream, does the necessary decoding and encoding, and sends it via RTMP to a server.
The constraints were that the output format be "flv" due to the design of the server end and that it take both audio and video input. Quality of the stream isn't that much of an issue as long as the audio doesn't desync too much from the video.

  


  I drew on the prior works of https://github.com/leixiaohua1020 in simplest_ffmpeg_streamer and simplest_ffmpeg_device.

  


  Specifically, I tried to mesh together the logic behind the readcamera project to provide an input stream and send it to an output address using the streamer part that previously took a local flv video as input.

  


  However, I ran into some problems.

  


  First of all, I know vfwcap is very much outdated but it seems dshow has some problems with the input part as well as the output part so I'm opting for whichever works first.

  


  Second of all, I don't really understand how to set the codec for the input. The input is using rawvideo by default and I tried to add settings as shown.
pFormatCtx->video_codec_id = AV_CODEC_ID_MPEG4;
However, none of the even slightly relevant codec settings seemed to work. All showed the same error message in the vfwcap error message image below.

  


  I would very much appreciate any pointers on achieving 1. change of codec in input stage 2. fixes for the dshow case

  


  I have put the full code up on github with the appropriate mentions.
https://github.com/luorix1/ffmpeg

  


  error message_dshow

  


  error message_vfwcap

  


• ffmpeg : Create a fake shadow below alpha channel webm/png sequence

  6 mai 2021, par Beneos Battlemaps

  Purpose : I'd like to render out animated 3D meshes as png sequence to use them as animated tokens for virtual tabletop games. To make the mesh looks more natural I'd like to create a fake show beneath the actual token.

  


  Problem : I have a png sequence 1 (as well as a webm file created with ffmpet out of this png sequence if it makes it easier) with alpha channel. To create the webm I use :
ffmpeg -framerate 24 -f image2 -i Idle_Top.%04d.png -c:v libvpx-vp9 -crf 25 -pix_fmt yuva420p Idle_Top.webm (If its relevant). I'd like to render out the png sequence to a webm file that have the current images as well as the transparent shadow beneath the token combined.

  


  Possible workflow : I think a good way to achieve the wanted shadow effect is to use the alpha channel image as a mask on a black picture with the same resolution as the source image 2. Then you have a complete black version of the image. Then you need to place this image beneath the colored image and make a offset of 10px left and 10px down to create the ilusion of perspective 3. At the end the black image below the colored image must have a transparency as well ( 30% visibility should be enough) 4.

  


  Workflow overview

  


  Assets : I've put the webm file and the png files on my gDrive https://drive.google.com/drive/folders/1wznGaPwhKc2UyPpSZBSISa1gs3oixsHR?usp=sharing

  


  Though I work with ffmpeg on a regular basis I have no clue where to start. Can you please help me out with this interesting problem ?

  


  Best regards
Ben