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• AForge FFMPEG Video operation issue

  9 janvier 2017, par Berkay

  I have a problem actually an issue about making video of images(captured frames). I am using nVLC to capture my IP camera’s video content. I managed to take these and show them in my application whenever a new frame comes up. But I also need to convert them whenever a user wants to save the record. This record should be long enough like 1-2 hours.

  So I decided to use AForge lib. In this library there is a class called VideoFileWriter.It does what I want. But here is the problem. I am getting 24-25 frames per second and I am drawing it on the screen. This causes a little bit of an overhead to my system (Especially when I am streaming 6 IP cameras to my screen). My CPU is utilized like %50-60 and i am using 500-550 MB of RAM while streaming 6 IP cameras and drawing to my screen.

  So I came up with two ideas,

  • I can process (write to a video file) each frame whenever I capture. (If user starts recording)
  • Or, I can store Bitmaps (captured frames) whenever user starts recording. Then I can process these list of (might be an array or List<> or another container etc...) later.

  The first approach will destroy my pc, because read/write is very very expensive operations for computers, so this will put me in a very bad position.

  Second approach will destroy my ram, because I may end up with 3600*25 frames for each bitmap list. But seems to be the better choice to me.

  Does anyone have any advice on this topic ?

• java Runtime.getRuntime().exec(ffmpeg) ceases processing for long video files

  6 janvier 2016, par metzojack

  I’m using Java Runtime.getRuntime().exec(ffmpeg) to execute an ffmpeg command to transcode video from any format to mp4 format. When command starts, ps -ef shows ffmpeg process and top shows that ffmpeg uses most of cpu (90%). When input video for ffmpeg is short (less than 4 mn) the Runtime.getRuntime().exec(ffmpeg) command runs well. But when trying to transcode full HD video that ffmpeg command need more than 10 minutes to be complete, an unknown problem happens around 5 minutes after ffmpeg command starts. ps -ef command still shows ffmpeg process even after many hours, but top command shows that ffmpeg process doesn’t use more that 1% of cpu. So Runtime.getRuntime().exec(ffmpeg) never finishes.

• Avoid repetition in Schtasks in PowerSehll

  30 juin 2017, par Ali

  The question is simple, but it seems I have problems with the philosophy of Schtasks.

  Goal :

  Download an online stream only for 2 hours every day (using FFMPEG) when my favorite program is streaming ; we can give a start and end date, but I am fine if it runs every day indefinitely.

  How :

  Schedule a task that runs a PowerShell script when the online program starts ; of course this is what I came up with ; feel free to make suggestions, if you have better ideas (maybe using Python).

  My Solution :

  schtasks /Create /SC DAILY /TN Task1 /TR "powershell.exe .\dl.ps1" /ST 18:00 /DU 02:00

  where the dl.ps1 contains :

  ffmpeg -i "rtmp://185.23.131.187/live/flv:tv3 live=1" -c copy .\fileName.flv

  Problem :

  This task repeats itself after 10 minutes --- which is the default repetition time.

  Question

  How do I achieve the goal and avoid the repetition ? Maybe my mindset about duration, /DU, and repetition interval, /RI, is wrong.

  Bonus question

  I would like to change the name of each recorded file, i.e., fileName, based on the day of recording. How do I do that in PowerShell ?

  I have seen a solution that requires exporting the task to XML file. I was hoping that we could come up with a more elegant solution, if possible.