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• Can't write out flv file in openCV in Windows

  7 août 2015, par dev_nut

  I’m trying to write out a flv file in openCV 2.4.9 in Windows 8.1 and it seems this gives an error.

      [flv @ 05821a00] Tag FLV1/0x31564c46 incompatible with output codec id '22' ([2]
  
  [0][0][0])

  After googling around, I noticed that I may have to recompile with ffmpeg support. I set up cmake (I’m a cmake noob) and did that. But, I didn’t change anything with regard to ffmpeg (like point to new libraries). I can’t seem to find a guide that would help me here.Is this the right way to go ? Would recompiling in this case, actually help at all ?

  • How do I solve this problem ?

• Need to record and stream live video in ffmpeg

  16 août 2020, par ankurgoel

  Need to record live webcamera and live stream it also record at the same time on the server.

  


  I was trying to implement this using FFMpeg in vue but not sure if this is the best way to implement this.

  


  Please guide if this can be done more efficiently than this.

  


• Linux : Create a file for writing with controlled flushing to disk in large chunks [closed]

  12 août 2023, par Pete

  On Linux I have a process (ffmpeg) that writes very slowly (even slower than 1kb / s sometimes) to disk. Ffmpeg can buffer this to 256kb chunks that get written infrequently but ffmpeg hangs occasionally and if I try to detect these hangs by checking that the file is being updated I need to wait a long time between updates, up to 10 or 15 mins, otherwise I can sometimes mistakenly kill the ffmpeg process when it appears to have stopped writing when it fact its still filling its internal buffer.

  


  Theres no way to detect this it seems unless I use strace (that I can find anyway). So I am wondering about turning off buffering in ffmpeg and writing unbuffered to disk from ffmpeg.

  


  This will result in the disk constantly making tiny writes and wasting power (and probably, if I use a SSD, mess with wear levelling too).

  


  So I would like to make ffmpeg write to a 'virtual file' (in memory - either kernel memory or a process) which I can specify the flushing characteristics of. The idea being to perhaps specify flush every 2 minutes, then I can keep an eye on the file size and make sure its still being written.

  


  I don't think I've missed any other ways to do this job - even if I could watch the socket stream incoming to ffpmeg the process itself could still stop writing and lose data. Doing the buffering outside of ffmpeg seems like the best way.

  


  Is there a built in way to do this in Linux or does it mean a custom process ? I guess I know how to do this with a small C program and pipe the data in but I wonder if theres a neater way.