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• ffmpeg - Poll folder for files, and stream as video with rtp

  17 janvier 2019, par Omer

  (I’m a newbie when it comes to ffmpeg).
  I have an image source which saves files to a given folder in a rate of 30 fps. I want to wait for every (let’s say) 30 frames chunk, encode it to h264 and stream it with RDP to some other app.

  I thought about writing a python app which just waits for the images, and then executes an ffmpeg command. For that I wrote the following code :

  main.py :

  import os
  
  import Helpers
  
  import argparse
  
  import IniParser
  
  import subprocess
  
  from functools import partial
  
  
  
  from Queue import Queue
  
  from threading import Semaphore, Thread
  
  
  
  
  
  def Run(config):
  
  
  
      os.chdir(config.Workdir)
  
      iteration = 1
  
  
  
      q = Queue()
  
      Thread(target=RunProcesses, args=(q, config.AllowedParallelRuns)).start()
  
  
  
      while True:
  
  
  
          Helpers.FileCount(config.FramesPathPattern, config.ChunkSize * iteration)
  
  
  
          command = config.FfmpegCommand.format(startNumber = (iteration-1)*config.ChunkSize, vFrames=config.ChunkSize)
  
  
  
          runFunction = partial(subprocess.Popen, command)
  
          q.put(runFunction)
  
  
  
          iteration += 1
  
  
  
  def RunProcesses(queue, semaphoreSize):
  
  
  
      semaphore = Semaphore(semaphoreSize)
  
  
  
      while True:
  
  
  
          runFunction = queue.get()
  
  
  
          Thread(target=HandleProcess, args=(runFunction, semaphore)).start()
  
  
  
  def HandleProcess(runFunction, semaphore):
  
  
  
      semaphore.acquire()
  
  
  
      p = runFunction()
  
      p.wait()
  
  
  
      semaphore.release()
  
  
  
  if __name__ == '__main__':
  
  
  
      argparser = argparse.ArgumentParser()
  
      argparser.add_argument("config", type=str, help="Path for the config file")
  
      args = argparser.parse_args()
  
  
  
      iniFilePath = args.config
  
  
  
      config = IniParser.Parse(iniFilePath)
  
  
  
      Run(config)

  Helpers.py (not really relevant) :

  import os
  
  import time
  
  from glob import glob
  
  
  
  def FileCount(pattern, count):
  
  
  
      count = int(count)
  
  
  
      lastCount = 0
  
      while True:
  
  
  
          currentCount = glob(pattern)
  
  
  
          if lastCount != currentCount:
  
              lastCount = currentCount
  
  
  
          if len(currentCount) >= count and all([CheckIfClosed(f) for f in currentCount]):
  
  
  
              break
  
  
  
          time.sleep(0.05)
  
  
  
  def CheckIfClosed(filePath):
  
  
  
      try:
  
          os.rename(filePath, filePath)
  
          return True
  
      except:
  
          return False

  I used the following config file :

  Workdir = "C:\Developer\MyProjects\Streaming\OutputStream\PPM"
  
  ; Workdir is the directory of reference from which all paths are relative to.
  
  ; You may still use full paths if you wish.
  
  
  
  FramesPathPattern = "F*.ppm"
  
  ; The path pattern (wildcards allowed) where the rendered images are stored to.
  
  ; We use this pattern to detect how many rendered images are available for streaming.
  
  ; When a chunk of frames is ready - we stream it (or store to disk).
  
  
  
  ChunkSize = 30 ; Number of frames for bulk.
  
  ; ChunkSize sets the number of frames we need to wait for, in order to execute the ffmpeg command.
  
  ; If the folder already contains several chunks, it will first process the first chunk, then second, and so on...
  
  
  
  AllowedParallelRuns = 1 ; Number of parallel allowed processes of ffmpeg.
  
  ; This sets how many parallel ffmpeg processes are allowed.
  
  ; If more than one chunk is available in the folder for processing, we will execute several ffmpeg processes in parallel.
  
  ; Only when on of the processes will finish, we will allow another process execution.
  
  
  
  FfmpegCommand = "ffmpeg -re -r 30 -start_number {startNumber} -i F%08d.ppm -vframes {vFrames} -vf vflip -f rtp rtp://127.0.0.1:1234" ; Command to execute when a bulk is ready for streaming.
  
  ; Once a chunk is ready for processing, this is the command that will be executed (same as running it from the terminal).
  
  ; There is however a minor difference. Since every chunk starts with a different frame number, you can use the
  
  ; expression of "{startNumber}" which will automatically takes the value of the matching start frame number.
  
  ; You can also use "{vFrames}" as an expression for the ChunkSize which was set above in the "ChunkSize" entry.

  Please note that if I set "AllowedParallelRuns = 2" then it allows multiple ffmpeg processes to run simultaneously.

  I then tried to play it with ffplay and see if I’m doing it right.
  The first chunk was streamed fine. The following chunks weren’t so great. I got a lot of [sdp @ 0000006de33c9180] RTP: dropping old packet received too late messages.

  What should I do so I get the ffplay, to play it in the order of the incoming images ? Is it right to run parallel ffmpeg processes ? Is there a better solution to my problem ?

  Thank you !

• lavfi/drawtext : add expansion function eif()

  4 juillet 2014, par Andrey Utkin

  lavfi/drawtext : add expansion function eif()
  It evaluates expression and outputs it as integer value, using specified
  
  format.
  Address trac ticket #3699.
  Signed-off-by : Stefano Sabatini <stefasab@gmail.com>
  

  • [DH] doc/filters.texi
  • [DH] libavfilter/version.h
  • [DH] libavfilter/vf_drawtext.c

• ffmpeg resize maintain aspect - filter not found

  4 décembre 2015, par paul

  I am trying to create image thumbnails that maintain the aspect of the orginal but crop it if the dimensions are too far out.
  found a likely code snippet here

  ffmpeg -i Einstein_500_459.jpg -vf scale="'if(gt(a,320/240),320,-1)':'if(gt(a,320/240),-1,240)'" Einstein_320x240_fit.png

  but cannot get ffmpeg to execute it. as is it generates error in terminal :

  ffmpeg -i Einstein_500_459.jpg -vf scale="'if(gt(a,320/240),320,-1)':'if(gt(a,320/240),-1,240)'" Einstein_320x240_fit.png
  
  ffmpeg version 0.10.12-7:0.10.12-1~precise1 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Apr 26 2014 09:49:36 with gcc 4.6.3
  
    configuration: --arch=amd64 --disable-stripping --enable-pthreads --enable-runtime-cpudetect --extra-version='7:0.10.12-1~precise1' --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --enable-bzlib --enable-libdc1394 --enable-libfreetype --enable-frei0r --enable-gnutls --enable-libgsm --enable-libmp3lame --enable-librtmp --enable-libopencv --enable-libopenjpeg --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-vaapi --enable-vdpau --enable-libvorbis --enable-libvpx --enable-zlib --enable-gpl --enable-postproc --enable-libcdio --enable-x11grab --enable-libx264 --shlibdir=/usr/lib/x86_64-linux-gnu --enable-shared --disable-static
  
    libavutil      51. 35.100 / 51. 35.100
  
    libavcodec     53. 61.100 / 53. 61.100
  
    libavformat    53. 32.100 / 53. 32.100
  
    libavdevice    53.  4.100 / 53.  4.100
  
    libavfilter     2. 61.100 /  2. 61.100
  
    libswscale      2.  1.100 /  2.  1.100
  
    libswresample   0.  6.100 /  0.  6.100
  
    libpostproc    52.  0.100 / 52.  0.100
  
  Input #0, image2, from 'Einstein_500_459.jpg':
  
    Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: mjpeg, yuvj444p, 500x459 [SAR 300:300 DAR 500:459], 25 tbr, 25 tbn, 25 tbc
  
  Incompatible pixel format 'yuvj444p' for codec 'png', auto-selecting format 'rgb24'
  
  [buffer @ 0x236d720] w:500 h:459 pixfmt:yuvj444p tb:1/1000000 sar:300/300 sws_param:
  
  [scale @ 0x235d5e0] [Eval @ 0x7fffcb68f270] Missing ')' or too many args in 'if(gt(a,320/240),320,-1)'
  
  [scale @ 0x235d5e0] [Eval @ 0x7fffcb68f270] Missing ')' or too many args in 'if(gt(a,320/240),-1,240)'
  
  Error when evaluating the expression 'if(gt(a,320/240),-1,240)'.
  
  Maybe the expression for out_w:'if(gt(a,320/240),320,-1)' or for out_h:'if(gt(a,320/240),-1,240)' is self-referencing.
  
  Error opening filters!

  after escaping single quotes

  ffmpeg -i Einstein_500_459.jpg -vf scale="\'if(gt(a,320/240),320,-1)\':\'if(gt(a,320/240),-1,240)\'" Einstein_320x240_fit.png

  it generates error

  ffmpeg -i Einstein_500_459.jpg -vf scale="\'if(gt(a,320/240),320,-1)\':\'if(gt(a,320/240),-1,240)\'" Einstein_320x240_fit.png
  
  ffmpeg version 0.10.12-7:0.10.12-1~precise1 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Apr 26 2014 09:49:36 with gcc 4.6.3
  
    configuration: --arch=amd64 --disable-stripping --enable-pthreads --enable-runtime-cpudetect --extra-version='7:0.10.12-1~precise1' --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --enable-bzlib --enable-libdc1394 --enable-libfreetype --enable-frei0r --enable-gnutls --enable-libgsm --enable-libmp3lame --enable-librtmp --enable-libopencv --enable-libopenjpeg --enable-libpulse --enable-libschroedinger --enable-libspeex --enable-libtheora --enable-vaapi --enable-vdpau --enable-libvorbis --enable-libvpx --enable-zlib --enable-gpl --enable-postproc --enable-libcdio --enable-x11grab --enable-libx264 --shlibdir=/usr/lib/x86_64-linux-gnu --enable-shared --disable-static
  
    libavutil      51. 35.100 / 51. 35.100
  
    libavcodec     53. 61.100 / 53. 61.100
  
    libavformat    53. 32.100 / 53. 32.100
  
    libavdevice    53.  4.100 / 53.  4.100
  
    libavfilter     2. 61.100 /  2. 61.100
  
    libswscale      2.  1.100 /  2.  1.100
  
    libswresample   0.  6.100 /  0.  6.100
  
    libpostproc    52.  0.100 / 52.  0.100
  
  Input #0, image2, from 'Einstein_500_459.jpg':
  
    Duration: 00:00:00.04, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: mjpeg, yuvj444p, 500x459 [SAR 300:300 DAR 500:459], 25 tbr, 25 tbn, 25 tbc
  
  Incompatible pixel format 'yuvj444p' for codec 'png', auto-selecting format 'rgb24'
  
  [buffer @ 0x1897720] w:500 h:459 pixfmt:yuvj444p tb:1/1000000 sar:300/300 sws_param:
  
  No such filter: '320/240)'
  
  Error opening filters!

  is this just a syntax problem ? or is my ffmpeg missing something ? or what ?
  this is ubuntu 12.04 with what i believe is a full install of ffmpeg, not the libav default thing. any help is appreciated.