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• Remove flicker, crop and upscale in ffmpeg

  22 août 2024, par Sabha

  I spent one full day on ffmpeg line commands by searching a lot on google but could not achieve what I wanted to and therefore I came here to seek some advice.
I have a video testinput.mpg which I believe is a mpeg-2 video. It is of 720x576 dimensions having 25 fps and a total bitrate of 4224 kbps

  


  First problem is that the exported footage is flickering which I wasn't able to remove using ffmpeg with lots of commands I tried like adjusting brightness, contrast, hue, saturation and all.

  


  Second problem was to extract the center portion which I was able to do it with the crop feature using following command.

  


  ffmpeg -i testinput.mpg -filter:v "crop=468:374" testoutput.mpg


  


  But after cropping I observed that that bitrate fell from 4224 kbps to 761 kbps and I assume this has reduced the quality of video.

  


  What I want to achieve is :

  


  

  1. Crop the video properly keeping the same quality (acodec copy vcodec copy) -> ffmpeg did not allow me to do both the things together (cropping and having same codec)

  


  2. Remove the flicker from video and upscale it to 4K or HD quality so that it looks nice on big televison (preferably 4K)

  


  


  I request some help on how to achieve the desired result. Can someone shed some light on it ?

  


  Here are 10 seconds sample videos on google drive that I am working on

  


  testinput.mpg

  


  testoutput.mpg

  


  Thanks

  


• How to work with data received from streaming services in my Java application ?

  24 novembre 2020, par gabriel garcia

  I'm currently trying to develop an "streaming client" as a way to organize multiple stream services (twitch, yt, mitele...) in a single desktop application written in Java.

  


  It basically relies on streamlink (which relies in ffmpeg) thanks to all it's features so my project could be defined as a frontend for streamlink.

  


  Straight to the point, one of the features I'd like to add it is the option to programatically record streams in the background and showing this video stream to the user when it's requested. Since there's also the possibility that the user wants to watch the stream without recording it, I'm forced to work with all that byte-like data sent from those streaming sources.

  


  So, the problem is basically that I do not know much about video coding/decoding/muxing/demuxing nor video theory like container structure, video formats and such.

  


  But the idea is to work with all the data sent from the stream source (let's say twitch, for example), read this bytes (I'm not sure what kind of information is sent to the client nor format) from the java.lang.Process's stdout and then present it to the client.

  


  Here's another problem : I don't know how to play video streams in JavaFX and I don't think it's even supported right now. So I would have to extract each frame and sound associated from the stdout and show them to the user each time a new frame is received (oups, another problem since I don't know when does each frame starts/ends since I'm reading each stdout's line).

  


  As a summary :

  


  

  • What kind of data am I receiving from the streaming source ?

  


  • How can I know when does each frame starts/stops ?

  


  • How can I extract the image and sound from each frame ?

  


  


  I hope I'm not asking too much and that you could shed some light upon my darkness.

  


• How to work with data from streaming services in my Java application ?

  24 novembre 2020, par gabriel garcia

  I'm currently trying to develop an "streaming client" as a way to organize multiple stream services (twitch, yt, mitele...) in a single desktop application written in Java.

  


  It basically relies on streamlink (which relies in ffmpeg) thanks to all it's features so my project could be defined as a frontend for streamlink.

  


  Straight to the point, one of the features I'd like to add it is the option to programatically record streams in the background and showing this video stream to the user when it's requested. Since there's also the possibility that the user wants to watch the stream without recording it, I'm forced to work with all that byte-like data sent from those streaming sources.

  


  So, the problem is basically that I do not know much about video coding/decoding/muxing/demuxing nor video theory like container structure, video formats and such.

  


  But the idea is to work with all the data sent from the stream source (let's say twitch, for example), read this bytes (I'm not sure what kind of information is sent to the client nor format) from the java.lang.Process's stdout and then present it to the client.

  


  Here's another problem : I don't know how to play video streams in JavaFX and I don't think it's even supported right now. So I would have to extract each frame and sound associated from the stdout and show them to the user each time a new frame is received (oups, another problem since I don't know when does each frame starts/ends since I'm reading each stdout's line).

  


  As a summary :

  


  

  • How can I know when does each frame starts/stops ?

  


  • How can I extract the image and sound from each frame ?

  


  


  I hope I'm not asking too much and that you could shed some light upon my darkness.