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• Adobe connect video : FLV to MP4 (export, convert)

  8 février 2017, par Guillaume Chevalier

  I would like to convert an adobe connect video from .flv in the downloaded zip to .mp4. I have already done the steps explained in this question and answer, however I get .flv files organised like this inside the .zip :

  

  Moreover, I know that ffmpeg can merge video and sound files together as well as concatenating resulting clips directly from the command-line which could be quite useful : https://www.labnol.org/internet/useful-ffmpeg-commands/28490/

  I can’t ask the owner of the video to make it available as an .mp4 from within the adobe connect admin interface. Briefly, I would like to listen to those videos in x2 speed in VLC (just like what I do when listening to random math classes on YouTube - I put ON the x2 speed). The amount of time I would gain to watch adobe connect videos in x2 speed is MASSIVE.

  I think I am not the only one that would like to do this. There are a lot of questions on forums about downloading adobe connect videos, but the .flv format mixed with some .xml is generally a killer when the host does not make the videos properly available in .mp4.

  Dealing with the order of the .flv files is a puzzle. At least, I would not care to flush the chat away and leave some details like that behind, that would help to reconstruct the videos. Any scripts to automate the process would be useful.

• Forwarding rtsp feed from one local port to another

  11 août 2021, par Thabet Sabha

  so let's say I have an rtsp server running on port 554, and when a certain command is received, i want the rtsp server to start forwarding the feed (using rtsp+tcp) to a service running on the same machine but on port 553 (Linux OS), is that possible via a CL command, or do I have to use something like ffmpeg ?

  


  currently this is what is being used, but I feel like this is redundant since all we're doing is just forwarding the feed to another port on the same machine.

  


  const ffmpegOptions = [
"-rtsp_transport", "tcp",
"-i", "rtsp://127.0.0.1:554",
"-codec", "copy",
"-f", "rtsp",
"-rtsp_transport", "tcp",
"rtsp://127.0.0.1:553"
]

const myProcess = spawn('ffmpeg', ffmpegOptions);


  


  Thanks.

  


• How to manually reset the offset of an mp4 video created from m4s files ?

  12 août 2020, par natdev

  I'm building a service that combine .m4s files (from a dash stream) to a mp4 video.
  
I have some sample m4s files from a random point in time of a stream,
  
using ffmpeg on those file + the init file does the job.

  


  cat init.mp4 032.m4s 033.m4s 034.m4s > output.mp4


  


  I have tried concating the m4s files to the mp4 init file and I manage to play the video,
  
but there is an offset from the encoded video segments.

  


  I guess ffmpeg does reset that somehow, and I was wondering how can I reset that offset as well ?
  
Having a little bit of experience with dash, I know that there is a field name presentationTimeOffset that is responsible to set the offset.