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• JSMpeg not able to get stream from RTSP

  20 octobre 2023, par Q.Rey

  i'm trying to get a RTSP stream inside a webpage, but with no success actually.

  



  For this I followed exactly the tutorial of JSMpeg : https://github.com/phoboslab/jsmpeg

  



  With a custom FFMPEG command :

  



  ffmpeg -i "rtsp://myurl/media.smp" \
 -vcodec h264 -f mpegts -codec:v mpeg1video -s 1290x980 -b:v 8000k \
 -r 25 -max_muxing_queue_size 9999 http://localhost:8081/supersecret


  



  My websocket well receive my connection on it.

  



  But my canvas is still a white square :


  



  The weird thing is when I change the websocket url with a false one, in my code, the canvas turn to black.

  



  So I guess that it turn WHITE when it receive something.

  



  Thansk for help

  


• How to copy audio stream using FFMpeg API ( not a command line tool )

  12 août 2013, par Jindong Jung

  I'm developing some Video Editing Apps on Android.

  the objective of the app is "Editing Videos on Android".

  and...

  I'm just completed making video file using some images.
  but.. I can't attach audio into the video.

  my method is same as follows.

  1.VideoStream, audio stream creation using AVFormatContext

  2.Movie encoding in video stream was successful

  3.Encode codec open in audio stream was successful

  4.Set sample format to AV_SAMPLE_FMT_FLTP

  5.Sample rate and channel was set same as source audio

  6.Choose appropriate Decoder and read packet

  7.Convert packets using swr_converter, setting same as sample format

  8.Encode converted data

  9.memory deallocation

  10.END !

  ---

  Problem is here :

  Video of finally created video file was normally played. but the Audio wasn't.

  It heared like weird. It have many noises and plays slowly.

  I've googled with many keywords but they only say about "FFmpeg command line usage".

  I wanna make with FFMpeg API. not a Command line tool.

  Please help.

• Convert JPG to MP4 and then concatenate other MP4 with them results in Non-monotonous DTS in output stream error

  25 août 2022, par Babagota

  I know this question has been answered but this isn't similar to my case.
I have many mp4 files that are all the same size, audio, ...

  


  01.mp4
...
25.mp4


  


  And I also have many jpg (all same size as my MP4) that I want to convert to 5s MP4 videos.
I used to convert them by using :

  


  ffmpeg -loop 1 -i myimage.jpg -t 5 myvideo.mp4


  


  Which produces an MP4 video of 5s, but when I want to concatenate all my previous MP4 with MP4 created from JPG with the following command :

  


  ffmpeg -f concat -safe 0 -i allmyvideos.txt -c copy all.mp4


  


  Then I have multiples errors/warnings :

  


  [mp4 @ 0000029eed493f80] Non-monotonous DTS in output stream 0:1; previous: 278633, current: 251856; changing to 278634. This may result in incorrect timestamps in the output file.


  


  And output is weird (freezing frames, ...).

  


  If I concat all my MP4 without the MP4 from JPG, I don't get any error and the output is fine.
So I guess that the problem is when I'm converting JPG.
I tried to add an empty audio to it, with the same sample rate as my MP4 :

  


  ffmpeg -y -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=22050 -loop 1 -i myimage.jpg -c:v copy -c:a aac -shortest -t 5 myvideo.mp4


  


  But I have the same error.
Any help appreciated, thank you.