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• FFMPEG GIF with transparency from png image sequence

  11 février 2020, par Nick S

  I’ve been trying to use ffmpeg to create a gif with a transparent background, but whenever the movement goes on top of the background, the pixels stay there. It’s a tree with a wind animation, this is how it ends up : https://i.imgur.com/pq4ArBG.png

  I first try to create the palette, and then the gif :

  ffmpeg -i Tree_%04d.png -vf palettegen=reserve_transparent=1 palette.png
  
  
  
  ffmpeg -framerate 30 -i Tree_%04d.png -i palette.png -lavfi paletteuse=alpha_threshold=128 treegif.gif

  It seems the previous frames simply stay there, but I can’t figure out how to dispose of them.

• Adjust Opus Ogg page size using Go

  15 mars 2024, par matthew

  Using the code from Go's Pion WebRTC library play-from-disk example I'm able to create a WebRTC connection and send audio from a local Ogg file to peers.

  


  The play-from-disk example README.md details how to first convert the page size of the Ogg file to 20,000 using ffmpeg, like so :

  


  ffmpeg -i $INPUT_FILE -c:a libopus -page_duration 20000 -vn output.ogg


  


  I'd like to make this same adjustment to Ogg data natively in Go, without using ffmpeg. How can this be done ?

  


  I've tried using Pion's oggreader and oggwriter, but using these requires deep Opus file format and RTP protocol knowledge that neither I nor ChatGPT seem to have.

  


  For additional context, I'm using a Text-to-Speech (TTS) API to generate my Ogg data as follows :

  


  req, err := http.NewRequest("POST", "https://api.openai.com/v1/audio/speech", bytes.NewBuffer([]byte(fmt.Sprintf(`{
    "model": "tts-1",
    "voice": "alloy",
    "input": %q,
    "response_format": "opus",
}`, text))))

req.Header.Add("Authorization", "Bearer "+token)
req.Header.Add("Content-Type", "application/json; charset=UTF-8")

client := &http.Client{}
resp, err := client.Do(req)



  


  As I'm trying to create a real-time audio app, ideally, I'd like to pipe the response to WebRTC performing the conversion on chunks as these are received so that peers can start to listen to the audio before it has been fully received on the server.

  


• Revision b72373de79 : make : flatten object file directories Rather than building an object file direc

  31 octobre 2012, par John Koleszar

  Changed Paths : Modify /build/make/Makefile Modify /examples.mk Modify /libs.mk Modify /test/test.mk Modify /vp8/vp8cx.mk Modify /vp9/vp9_common.mk make : flatten object file directories Rather than building an object file directory heirarchy matching the source tree's layout, rename (...)