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• RTSP Feed Screen Cutoff

  25 août 2021, par Jackson Medina

  Recently I have been trying to consume the RTSP stream from a Vivitar Folding Drone. By reverse-engineering the .apk file for the Vivitar Folding Drone app, I was able to find that the RTSP address for the drone is rtsp://192.168.1.1:7070/webcam however, whenever I consume this stream through VLC or FFPLAY, most of the feed gets cut off and replaced with a green screen or gray screen (depends on whether I save to a .mjpeg file or a .dump file). What is the cause of this problem and what steps can I take to fix it ?

  


  

  


  When using FFPLAY, I use the following command :

  


  ffplay -i -rtsp_flags rtsp://192.168.1.1:7070/webcam


  


  I also receive this error when I first start consuming the stream with ffplay :

  


  [swscaler @ 00000240daeadf80] deprecated pixel format used, make sure you did set range correctly


  


  I receive this error message for about every frame of the stream :

  


  [mjpeg @ 00000240d6226b00] mjpeg_decode_dc: bad vlc: 0:0 (00000240d6266050)
[mjpeg @ 00000240d6226b00] error dc
[mjpeg @ 00000240d6226b00] error y=1 x=0


  


  NOTE : I am unsure if this is relevant, but the Vivitar Drone creates its own wifi network that must be signed onto if you want to consume the RTSP stream

  


  Also, the drone feed works perfectly fine when viewed through the Vivitar Folding Drone app. I just can't seem to get it to display properly through FFPLAY, FFMPEG, or VLC.

  


  UPDATE :

  


  Upon further inspection, it seems like the Vivitar Folding Drone may not be sending all of the jpg data for a single frame. Here is an image generated by unaltered byte data sent through the RTSP feed.


  


  I noticed three things from this image :

  


  

  1. The image appears to be missing large chunks of data.

  


  2. The image appears to be redshifted

  


  3. The two visible portions of the image should be sequential (it looks as though the second visual portion lines up with the first). An example of this can be seen below.

  


  


• FFMPEG Screen Cutoff

  18 août 2021, par Jackson Medina

  Recently I have been trying to consume the RTSP stream from a Vivitar Folding Drone. By reverse-engineering the .apk file for the Vivitar Folding Drone app, I was able to find that the RTSP address for the drone is rtsp://192.168.1.1:7070/webcam however, whenever I consume this stream through VLC or FFPLAY, most of the feed gets cut off and replaced with a green screen or gray screen (depends on whether I save to a .mjpeg file or a .dump file). What is the cause of this problem and what steps can I take to fix it ?

  


  

  


  When using FFPLAY, I use the following command :
ffplay -i -rtsp_flags rtsp://192.168.1.1:7070/webcam

  


  I also receive this error when I first start consuming the stream with ffplay :

  


  [swscaler @ 00000240daeadf80] deprecated pixel format used, make sure you did set range correctly


  


  I receive this error message for about every frame of the stream :

  


  [mjpeg @ 00000240d6226b00] mjpeg_decode_dc: bad vlc: 0:0 (00000240d6266050)
[mjpeg @ 00000240d6226b00] error dc
[mjpeg @ 00000240d6226b00] error y=1 x=0


  


  NOTE : I am unsure if this is relevant, but the Vivitar Drone creates its own wifi network that must be signed onto if you want to consume the RTSP stream

  


• how to record screen using ffmpeg with variable framerate

  20 mai 2024, par AJ Dev

  I want to record desktop using ffmpeg with variable framerate.

  


  set a limit of fps to 120fps
now ffmpeg handle automatically that my max limit is 120
if pc is highly configured then record to 120
otherwise record auto fps like 5,10 whatever

  


  i searched on google i found -vsync 2 and -vsync vfr but these are not working.

  


  my command is

  


  ffmpeg -use_wallclock_as_timestamps 1 -re -vsync vfr -thread_queue_size 1024 -rtbufsize 1024 -indexmem 1024 -probesize 32 -analyzeduration 0 -framerate 120 -f rawvideo -pix_fmt rgb32 -video_size 1366x768 -i \.\pipe\testscreen-4c0b1a88-d4d0-4f6a-55a6-c4587a0ccb7c3 -async 1 -thread_queue_size 1024 -rtbufsize 1024 -indexmem 1024 -probesize 32 -f s16le -acodec pcm_s16le -ar 44100 -ac 2 -i \.\pipe\testscreen-d185c2a9-ac89-4966-b8d7-cec897848790 -fflags +genpts -fflags nobuffer -r 120 -vcodec libx264 -crf 21 -pix_fmt yuv420p -preset ultrafast -b:v 0 -maxrate 0 -bf 0 -profile:v high -x264opts "keyint=300:bframes=0:sliced_threads=1:slices=4:lookahead_threads=4:threads=4" -tune zerolatency -movflags +faststart -y -fflags +genpts -c:a aac -strict -2 -b:a 128k "C :\2021-08-16_13-21-38-815.mp4"