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• How to "re-interlace" a video ? How to convert a naïvely deinterlaced 480p video back to 480i ? [closed]

  8 juillet 2021, par toughluck

  I have a 480p video that was naïvely created from a 480i original and had no deinterlacing applied. The resulting format is 480p25. Combing is visible and I would like to convert it back to 480i50, so sort of "re-interlace" the video back to its original state.

  


  I have tried the solution from this question : How to convert a 1080p to 1080i using FFMPEG but it did not create the expected output.

  


  I looked at ffmpeg reference here : https://www.ffmpeg.org/ffmpeg-all.html but I could not find a proper option. Tons of filters to deinterlace interlaced videos but nothing to "re-interlace" them.

  


  My expected output would be this :

  


   ------> time
Input:
Frame 1 (0 ms)        Frame 2 (40 ms)

11111                 33333
22222                 44444
11111                 33333
22222                 44444

Output 1:
Frame 1 (0 ms)  Frame 2 (20 ms) Frame 3 (40 ms) Frame 4 (60 ms)
11111           22222           33333           44444
11111           22222           33333           44444
11111           22222           33333           44444
11111           22222           33333           44444

(Alternative) Output 2:
Frame 1 (0 ms)  Frame 2 (20 ms) Frame 3 (40 ms) Frame 4 (60 ms)
22222           11111           44444           33333
22222           11111           44444           33333
22222           11111           44444           33333
22222           11111           44444           33333


  


  (I'm not sure whether it's top field first or bottom field first, so I'd like to have an option to try both.)

  


  Is this possible ?

  


• Do i need a client to stream data ?

  28 novembre 2017, par Adalcar

  I am writing a web interface for a set of cameras using ffmpeg.

  The issue comes when trying to stream this data :
  after shamelessly ripping this code, replacing the ip with localhost for testing purposes, I tried to read the stream with VLC, to no avail : the server side runs without problem but the packets seem to disappear in thin air.

  That’s when I open the server with

  avio_open2(&server, "udp://localhost:554", AVIO_FLAG_WRITE, NULL, &options);

  If I use rtsp instead, it has the decency of failing with "unknown protocol" (?)

  and for http, it pops an unknown error.

  Do I need a client request to start streaming ?

• creating a jack client from inside a docker container

  19 novembre 2018, par unameuname

  I use jack to route audio between multiple sound cards in my pc.
  To record the audio i use a very convenient FFmpeg command which creates a writable jack client :
  ffmpeg -f jack -i  -strict -2 -y .
  so far this works very well.

  The problem starts here :

  I also have an nginx docker which records my data and makes it available for streaming. when trying to use the same command inside the docker i get the following error :"Unable to register as a JACK client".

  I started to look in to the FFmpeg code and found out that the FFmpeg command calls the jack_client_open command from the jack API, which fails.

  Seems like there is some kind of a problem in the connection between the FFmpeg request from inside the docker to the jackd server running on the host.

  Is there a simple way to create a connection between the two [exposing ports] ?

  (I saw some solutions like netjack2, but before creating a more complex server-client architecture i’d like to find a more elegant solution).

  Thanks for the help !