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• Capture CMOS video with FPGA, encode and send over Ethernet

  23 décembre 2015, par ya_urock

  I am planning a open source university project for my students based on Zynq Xilinx FPGA that will capture CMOS video, encode it into transport stream and send it over Ethernet to remote PC. Basically I want to design yet another IP camera. I have strong FPGA experience, but lack knowledge regarding encoding and transfering video data. Here is my plan :

  1. Connect CMOS camera to FPGA, recieve video frames and save them to external DDR memory, verify using HDMI output to monitor. I have no problems with that.

  2. I understand that I have to compress my video stream for example to H.264 format and put into transport stream. Here I have little knowledge and require some hints.

  3. After I form transport stream I can send it over network using UDP packets. I have working hardware solution that reads data from FIFO and sends it to remote PC as UDP papckets.

  4. And finally I plan to receive and play video using ffmpeg library.

     ffplay udp://localhost:5678

  My question is basically regarding 2 step. How do I convert pixel frames to transport stream ? My options are :

  1. Use commercial IP, like
     • http://www.xilinx.com/products/intellectual-property/1-4iso32.html
     • http://www.xilinx.com/products/intellectual-property/1-1lk9j1.html#overview

  Here I doubt that they are free to use and we don’t have much funds.

  2. Use open cores like

     • http://sourceforge.net/projects/hardh264/ - here core generates only h264 output, but how to encapsulate it into transport stream ?
     • I have searched opencores.org but with no success on this topic
     • Maybe somebody knows some good open source relevant FPGA projects ?

  3. Develop harware encoder by myself using Vivado HLS (C Language). But here is the problem that I don’t know the algorithm. Maybe I could gig ffmpeg or Cisco openh264 library and find there a function that converts raw pixel frames to H.264 format and then puts it into transport stream ? Any help would be appriciated here also.

  Also I am worried about format compatibility of stream I might generate inside FPGA and the one expected at host by ffplay utility. Any help, hints, links and books are appriciated !

• Documentation #3972 : template variants and possible bug ?

  6 juillet 2017, par Kamran Mir Hazar

  I have SPIP 3.1.6 [23444].

  On Thu, Jul 6, 2017 at 8:20 PM, <redmine@spip.org> wrote :

  La demande #3972 a été mise à jour par nico d_.

  Hi,
  which version of SPIP are you using ?

  ---

  Anomalie #3972 : template variants and possible bug ?

  Auteur : Kamran Mir Hazar
  Statut : Nouveau
  Priorité : Normal
  Assigné à :
  Catégorie :
  Version cible :
  Resolution :
  Navigateur :

  Hello,
  The following template variants do not work for me :
  I have section number 101, with articles in fa and en languages in it.
  I have also files article.html for the main site’s language which is fa, and
  article.en.html for the en language articles. Both work fine in general. I
  created two other variants to apply articles in section 101 with two
  separate languages. They are : article=101.fa.html and article=101.en.html .
  SPIP ignores these two variants and proceeds article.html for fa language
  articles, and article.en.html for en language articles in section 101, like
  the other sections. I added also article=101.html to see if it works, but
  didn’t.
  I asked this in French and English mailing lists, but couldn’t find any
  solution.
  Thank you
  Kamran

  PS : I tried based of the following article :
  https://www.spip.net/en_article4363.html

  ---

  Vous recevez ce mail car vous êtes impliqués sur ce projet.
  Pour changer les préférences d’envoi de mail, allez sur
  http://core.spip.org/my/account

• Any solution to convert .yuv file to h264 file on Mac ?

  27 juin 2014, par piaChai

  I want to develop an app for mac which can record the current screen.But now I have trouble on not knowing how to encode .yuv file I got from CGImage.Somebody told me to encode with x264 or ffmpeg,I am not sure if these are the right choice for OS X development.If anyone has any experience in doing this,I really appreciate that you could tell me.Thanks.