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• FFMPEG and FFPlay can access rtsp stream from one ip, but from other ip, it can't

  28 mai 2022, par Crear

  The situation is kind of complex. I was archiving several CCTV camera feeds (rtsp, h264, no audio) through OpenCV, which worked but the CPU utilization was too high and started to lose some frames time by time.

  


  To reduce the CPU utilization, I started to use FFMPEG to skip the decoding and encoding processes, which worked perfectly on my home machine. However, when I connected to my university VPN and tried to deploy it on our lab server, FFmpeg couldn't read any frame, ffplay couldn't get anything either. However, OpenCV, VLC Player and IINA Player could still read and display the feed.

  


  In Summary,

  


  1 FFMPEG/ffplay

  


  1.1 can only read the feed from my home network(Wi-Fi, optimum)

  


  1.2 from other two networks, the error message says : "Could not find codec parameters for stream 0 (Video : h264, none) : unspecified size
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options"

  


  2 IINA/VLC Player, OpenCV
These tools can get the video all the time.

  


  I'm wondering whether it's related to some specific port access, that the ffmpeg required but the others don't. I'd appreciate it if anyone can provide any suggestions.

  


  As references, the tested ffplay command is simple :

  


  ffplay 'the rtsp address'


  


  Thanks

  


  ---

  


  Update

  


  More tests have been performed.

  


  By specifying rtsp_transport as TCP, ffplay can play the video, but FFmpeg can't access the video. (In the beginning, when both FFmpeg and ffplay worked through my home network, it was UDP)
The FFmpeg command is as follows :

  


  ffmpeg -i rtsp://the_ip_address/axis-media/media.amp -hide_banner -c:v copy -s 1920x1080 -segment_time 00:30:00 -f segment -strftime 1 -reset_timestamps 1 -rtsp_transport tcp "%Y-%m-%d-%H-%M-%S_Test.mp4"


  


  Please help...

  


• Building an RTSP streaming server from processed frames

  27 avril 2016, par ProEns08

  I have to process frames from a distant camera using OpenCV.

  I need to stream the processed frames to be accessible over network as a live video.

  How to make the processed frames (cv::Mat objects) be passed to the RTSP streaming server in real time ?

• How to set frame offset for source and reference video for calculating using FFMpeg commandline ?

  1er septembre 2018, par Souvik Das

  I have a scenario where I am streaming a reference video on a server machine and receiving it at a client machine with exact same codec, using FFMpeg via UDP/RTP.

  So, I have a reference.avi file and a recording.ts file with me. Now, due to a network side issue and FFMpeg discarding old frames, often the recording.ts lacks exactly 12 FRAMES from the beginning. Sometimes, it may lack more frames in-between but that’d due to general network traffic and packet loss reason and I don’t plan to account for that. Anyways, due to those 12 frames, when I calculate the PSNR, it drops down to 13, even though remaining frames may/may not be affected.

  So, my aim is to discard first 12 frames from reference.ts and then compare. For that, I would also need to adjust the frames from recording.ts.

  Consider the following scenario :

  reference.ts has 1500 frames. So naturally I am going to cut-short it 1488. Then we have the following cases :

  1. recording.ts has 1500 frames. This is not affected. Still I will remove 12 frames to match the count. So frame 1 would then represent frame 13.
  2. recording.ts has 1496 frames. This is not affected. Still I will remove 12 frames even though it’d get to 1484 count assuming that frame 1 would then represent frame 13.
  3. recording.ts has 1488 frames. This is affected. No need to remove frames.
  4. recording.ts has 1480 frames. This is affected. No need to remove frames.

  Once that is done, then I will calcualte the PSNR. So, my FFMpeg should be able to do all this, hopefully in a single command on bash.

  A better alternative would be for FFMpeg to find the where the 13th frame is in recording.ts and then cut-short from the beginning. That’d be more preferred and even more if there is no cut-shorting required, i.e. if offset could be set in-line to command and no additional video output is generated for use in PSNR comparison.

  Current I am using the following command to calculate the PSNR.

  ffmpeg -i 'recording.ts' -vf "movie='reference.avi', psnr=stats_file='psnr.txt'" -f rawvideo -y /dev/null

  It’d be great if somebody could help me in this regard. Thanks.