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• How too keep highest value of ffmpeg crop detect

  15 juillet 2015, par Vincent Duprez

  Case :

  I’m converting an old archive of 18000 commercials
  I’d like to automate this reconversion from DV to some lighter and uptodate h264 mp4

  The whole process is ready but I’m stuck at the first part : cropping the black bars...

  Tools used :

  The thing is : all videos are different, I cannot use one static value, thus I use the wonderful cropdetect tool by ffmpeg which outputs me this kind of lines in the cli :

  [Parsed_cropdetect_0 @ 0xbe5e960] x1:22 x2:697 y1:93 y2:483 w:672 h:384 x:24 y:98 pts:63 t:2.520000 crop=672:384:24:98
  
  [Parsed_cropdetect_0 @ 0xbe5e960] x1:22 x2:697 y1:93 y2:483 w:672 h:384 x:24 y:98 pts:64 t:2.560000 crop=672:384:24:98
  
  [Parsed_cropdetect_0 @ 0xbe5e960] x1:22 x2:697 y1:93 y2:484 w:672 h:384 x:24 y:98 pts:65 t:2.600000 crop=672:384:24:98
  
  [Parsed_cropdetect_0 @ 0xbe5e960] x1:22 x2:697 y1:93 y2:496 w:672 h:400 x:24 y:96 pts:66 t:2.640000 crop=672:400:24:96
  
  [Parsed_cropdetect_0 @ 0xbe5e960] x1:2 x2:717 y1:80 y2:496 w:704 h:416 x:8 y:80 pts:67 t:2.680000 crop=704:416:8:80
  
  [Parsed_cropdetect_0 @ 0xbe5e960] x1:1 x2:718 y1:80 y2:496 w:704 h:416 x:8 y:80 pts:68 t:2.720000 crop=704:416:8:80
  
  [Parsed_cropdetect_0 @ 0xbe5e960] x1:1 x2:718 y1:80 y2:496 w:704 h:416 x:8 y:80 pts:69 t:2.760000 crop=704:416:8:80
  
  [Parsed_cropdetect_0 @ 0xbe5e960] x1:1 x2:718 y1:80 y2:496 w:704 h:416 x:8 y:80 pts:70 t:2.800000 crop=704:416:8:80
  
  [Parsed_cropdetect_0 @ 0xbe5e960] x1:1 x2:718 y1:80 y2:496 w:704 h:416 x:8 y:80 pts:71 t:2.840000 crop=704:416:8:80

  So the last part : crop= gives the result of the remaining frame (width, hight, starting x point starting y point. to crop the video..

  But these values are not always the same inside one video how can I extract ’the biggest values’ out of these hundreds of lines ?

  In this case, just keep crop=704:416:8:80

  Edit

  Actually, the result should take in account the lowest x1, highest x2, lowest y1 and highest y2, then create a rectangle multiple of 16 inside it...

• Stream microphone from iOS and Android to ffmpeg on server [on hold]

  22 août 2019, par Demosthenes

  To be perfectly clear : The problem here is that ffserver has been dropped, and I find all alternatives proposed (such as gstreamer) too complicated to get into. If anybody wants to propose ffserver, it has been removed from ffmpeg, years ago actually, and is no longer maintained, and thus no option anymore.

  I want something simple : I want to stream the microphone from a mobile device to an ffmpeg process. So, the device encodes audio (let’s say aac but it really doesn’t matter), and I have the data ready for sending. I can send it somewhere, but I cannot open a server on the phone hosting a stream.

  What I want to be done : The data shall be processed, in real time, by an ffmpeg process running on a server. That process can be spawned on demand when needed, the handshake for this is not a problem.

  My problem : It seems to me that ffmpeg cannot listen on a port for a stream as input, but only actively connect to another server to retrieve the input stream.

  I’m looking for a simple solution to get this done. Writing a small program (almost any language, really) is not an issue. One solution I’ve been thinking about was writing a Python script or C++ program as the server and linking that against ffmpeg and feeding the audio data inside this program to ffmpeg. That’s not actually what I want, I would like to just pipe the data through the ffmpeg executable, but would be a last resort.

  Does anybody have an idea for a simple solution for this ?

• Ffmpeg : Scale+crop video then overlay image ?

  8 juillet 2019, par skitzo

  This is my first SO question. Help me help you help me : does this question need any clarification ?

  Goal : A script that makes Instagram-ready videos with audio, and a logo overlay. The script takes in an audio and video source and combines them. Important : the logo should have a consistent position and size for each video. This probably means that all output videos should have the same width x height.

  Any alternate approaches are welcome !

  The ffmpeg command I’m calling from python is below. I try to scale the video to 720 :-2 (so auto-height), then crop a 500x500 square from the center. The choices of 720 and 500 are arbitrary ; better approaches are welcome.

  ffmpeg -i video.mp4 -i logo.png -i audio.mp3 -filter_complex "[0:v]scale=720:-2,crop=500:500[bg];[bg][1:v] overlay=(W-w)/2:(H-h)/2" -pix_fmt yuv420p -map 0:v -map 2:a -shortest + output.mp4

  This script errors on some videos.

  [Parsed_crop_1 @ 0x7fcf96401f00] Invalid too big or non positive size for width '500' or height '500'
  
  [Parsed_crop_1 @ 0x7fcf96401f00] Failed to configure input pad on Parsed_crop_1

  I’m new to ffmpeg so please guide me to correct usage of filter_complex. Thank you !