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• FFMPEG - Streaming GoPro4 to RSTP

  20 mai 2017, par Winged

  Greeting !
  I’m planning to capture a realtime streaming video from GoPro4 and load it into TouchDesigner in order to use this footage in a projection mapping project.

  So far I was able to play GoPro4 stream using ffplay doing as follows :
  1. Host GoPro4 WiFi hotspot.
  2. Connect a laptop WiFi to GoPro4’s hotspot.
  3. Restart GoPro stream service by opening ’http://10.5.5.9/gp/gpControl/execute?p1=gpStream&c1=restart’ in s browser.
  4. Run ffplay command in order to open ffplay stream video window : ’ffplay -an -fflags nobuffer -f:v mpegts -probesize 8192 rtp ://10.5.5.9:8554’

  The next step I opt to make it to re-stream this signal into RTSP protocol so TouchDesigner could receive this signal.

  And here is my question - how to re-stream this input to RTSP ?

• How to "unconcatenate" MP4 file ?

  17 avril 2023, par arne

  I used Losseless Cut (which uses ffmpeg) to concatenate a bunch of MP4 files using ffmpeg concat demuxer. Unfortunately I didnt' check the result before deleting the source clips. The first clip had different format than the rest. The resulting clip has all the audio and video from the first clip. Rest of the video gives decoding errors.

  


  I'm looking for a way how to "unconcatenate" the file and get back the original video. I believe it's in the container, just incorrectly labeled as 1920x1080x50 hevc video.

  


  I believe I should export the audio and video streams, cut away the first frames from both streams up to the point where the first clip ends, then change the format of the video stream and finally put them back into container.

  


  I'm not sure what tools and commands to use the cut the video stream and what commands and tools to use force the correct video format on the stream.

  


  I've read ffmpeg documentation but it's vast and my use case isn't directly covered. I'm planning to play around with different tools, but I'm new to the subject and thought to ask first.

  


• Audio alternative to FFmpeg - Core Audio IOS

  9 juin 2021, par cs guy

  I have been using FFmpeg Android for a music app I'm working on. I built a custom audio engine from stratch with C++ and FFmpeg and it works amazing and it fulfilled all my needs. However, Due to FFmpeg being Lgpl lisence, it seems to me after some researching it is not possible to use a lgpl lisence due to app stores policy. Im not a lawyer or have the money to hire a lawyer for a commercial advise. So I am thinking to replace ffmpeg with another audio decoder, processor library. I am planning to feed the custom decoded data to audio devices through Apples core audio library.

  


  Here are my needs :

  


  

  • Need to decode ogg files

  


  • Need to encode pcm data as aac file

  


  • Need to add post process FX to decoded data such as low pass filter etc

  


  


  So what I am asking for is an answer to one of the following :

  


  

  • Could FFmpeg really not be used in app store due to lgpl static linking issues ? (I looked at the most famous apps that use FFmpeg on Android, all of them does not use FFmpeg on IOS)

  


  • If I were to use another library for FFmpeg what is the best alternative to work with ? Did anyone actually had experienced the same situation that I am in ?

  


  


  I also tried using AudioKit but it has a critical problem that does not meet with my requirement so I dropped it.

  


  I am looking for advice here. Thanks !