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• timelapse images into a movie, 500 at a time

  2 mars 2017, par molly78

  I am trying to make a script to turn a bunch of timelapse images into a movie, using ffmpeg.

  The latest problem is how to loop thru the images in, say, batches of 500.

  There could be 100 images from the day, or there could be 5000 images.

  The reason for breaking this apart is due to running out of memory.

  Afterwards I would need to cat them using MP4Box to join all together...

  I am entirely new to bash, but not entirely programming.

  What I think needs to happen is this

  1) read in the folders contents as the images may not be consecutively named

  2) send ffmpeg a list of 500 at a time to process (https://trac.ffmpeg.org/wiki/Concatenate)

  2b) while you’re looping thru this, set a counter to determine how many loops you’ve done

  3) use the number of loops to create the MP4Box cat command line to join them all at the end.

  the basic script that works if there’s only say 500 images is :

  #!/bin/bash
  
  
  
  dy=$(date '+%Y-%m-%d')
  
  
  
  ffmpeg -framerate 24 -s hd1080 -pattern_type glob -i "/mnt/cams/Camera1/$dy/*.jpg" -vcodec libx264 -pix_fmt yuv420p Cam1-"$dy".mp4

  MP4Box’s cat command looks like :

  MP4Box -cat Cam1-$dy7.mp4 -cat Cam1-$dy6.mp4 -cat Cam1-$dy5.mp4 -cat Cam1-$dy4.mp4 -cat Cam1-$dy3.mp4 -cat Cam1-$dy2.mp4 -cat Cam1-$dy1.mp4 "Cam1 - $dy1 to $dy7.mp4"

  Needless to say help is immensely appreciated for my project

• ffmpeg - Have troubling syncing up audio and video together

  15 février 2017, par zyeek

  I have a webcam and a separate mic. I want to record what is happening.

  It almost works, however the audio seems to play quickly and parts missing while playing over the video.

  This is the command I am currently using to get it partially working

  ffmpeg -thread_queue_size 1024 -f alsa -ac 1 -i plughw:1,0 -f video4linux2 -thread_queue_size 1024 -re -s 1280x720 -i /dev/video0 -r 25 -f avi -q:a 2 -acodec libmp3lame -ab 96k out.mp4

  I have tried other arguments, but unsure if it has to do with the formats I am using or incorrect parameter settings.

  Also, the next part would be how to stream it. Everytime I try going through rtp it complains about multiple streams. I tried doing html as well, but didn’t like the format. html html://localhost:50000/live_feed or rts rts://localhost:5000

  edit :

  I am running this on a rpi 3.

• FFMPEG split video with equal frames in the splits....?

  17 janvier 2017, par Gurinderbeer Singh

  I am using FFMPEG to split a video file by using the following command :

  ffmpeg -i input.mp4 -c copy -segment_times 600,600 -f segment out%d.mp4

  This command divides video based on time.. But even if output splits are of same duration, number of frames are different in the splits..

  Is there a way of splitting a video file without recoding so that number of frames are equal in splitted files.?

  Even if it use some other tool than FFMPEG.

  For example : input.mp4 of duration 200 seconds has 5000 frames.

  Can we split this into :

  input1.mp4 having 2500 frames
  and input2.mp4 having 2500 frames.

  It doesn’t matter if duration of output splits is different..

  Please help.....!