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• Converting PNG images to MP4 in Jupyter

  15 mars 2020, par Steve H

  This has had me going round in circles for hours, so I’m hoping one of you kind gents can help.

  I am trying to learn more about data science and have followed this course on creating a population pyramid (https://www.viralml.com/video-content.html?v=WmyYyOtZwzs). There were a few problems in the code, which I rectified, but one has eluded me.

  I am trying to convert a collection of images in the format anim_%d.png to an mp4 file using the code :

  ffmpeg -framerate 10 -i "anim_%d.png" -pix_fmt yuv420p out.mp4

  However, I get an invalid syntax error.

  I have also tried :

  avconv -f image2 -i anim_%d.png -r 76 -s 800x600 foo.avi

  then :

  ffmpeg -r 10 -i "anim_%d.png" -pix_fmt yuv420p out.mp4

  But they all give a syntax error.

  I am using Jupyter, via Anaconda on a Windows machine with Python 3.

  Any help would be greatly appreciated.

  Thanks
  Steve

• How to get Bitrate and FPS statistics with ffplay

  30 novembre 2016, par S4M11R

  I would like to measure statistics (FPS, Bitrate) from a ffplay command instead of ffmpeg. This because recording for many hours takes a lot space on disk.

  The way I do it now is that I record a video with ffmpeg for a specific duration and save statistics (-qphist) in a file

  Command :

  ffmpeg -rtsp_transport tcp -t $duration -i rtsp://$cred/axis-media/media.amp?videocodec=h264 -qphist -vcodec copy -r 60 -y $outputDIR/camRecording_h264.avi &> $logfile &

  Instead I would like to play a rtsp video and collect statistics so that video is not saved on disk but still get the same statistics.

  Command

  ffplay "command" &> file

  With ffplay I can get some info with loglevel but nothing about FPS or Bitrate

  I checked man ffplay and googled around but could not find anything about this.

  Is it even possible to get FPS and Bitrate statistics from ffplay ?

  Best regards

• Zoneminder Watermarking on MP4 video from custom ZM branch

  25 juillet 2017, par moeiscool

  The ZM i have installed is the video branch. I followed these instructions to install it.
  https://github.com/ZoneMinder/ZoneMinder/tree/video
  https://github.com/ZoneMinder/ZoneMinder/issues/452

  I am looking to watermark my recordings. I have successfully achieved what i want on regular ZM. I just need it on the MP4 branch version of ZM. I have used ASR to search for "ffmpeg" and "mp4" but i only found anything relevant to video creation in zmvideo.pl... but i think zmvideo.pl is only for generating videos from JPEG files. I simply want to have the watermark appear on the mp4 file when it is created.

  So in short after a long explanation : Where should I be looking for the commands that create the MP4 files in ZM ? or do i have to add them to jpeg frames somewhere or something ? sorry for the noobiness... I have spent at least 3 hours looking for this and I’m actually sweating from frustration. ANY help at all would be appreciated :) Thanks in advance.