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• Video with drop frames with ffmpeg

  28 mai 2018, par Gabe Mata

  I am recording videos using ffmpeg in a production environment almost non-stop for 15 hours a day. Sometimes the videos are freezing for a few seconds.

  I believe the hardware is adequate. It is an i7 with 16GB ram and windows 10. The videos are on average about 2:00 minute each.

  This happens a few times a day 10 or so that I am awarded.

  Here is a link to one of the videos that froze:

  https://drive.google.com/open?id=1q6R2l1AkCko-uh2KZ6X8AChdGU5XBOy7

  It freezes at 0:03 and then restarts at 0:16

  Here is the ffmpeg command I am using:

  ffmpeg -i "rtsp://10.0.131.2/media/video1" -f segment -segment_time 9000 -segment_format mp4 -reset_timestamps 1 -strftime 1 -c copy -map 0 gabe.mp4

  Can I decreases the quality of the videos so videos don't randomly freeze?

  Would recording without audio help the videos not randomly freeze?

  Thanks,

  Gabe

• Capture Image from Serial Camera FFMPEG

  28 mai 2018, par Jomanuel Ponferrada

  I have a serial camera plugged-in on my linux os. I would like to capture image using FFMPEG but the all example are webcam and ip camera. I also visit this link to see the list of devices https://www.ffmpeg.org/ffmpeg-devices.html. But i cant see the serial camera examples. My serial cam location is on /dev/ttyS0. In my C++ program i can capture image from my serial camera..

  Tnx for the help in advance :)

• How can I install brew (or ffmpeg) on Heroku ?

  28 mai 2018, par Donovant

  As per the title, I'd like to know whether and how to install brew, because I need to install ffmpeg lib

  I tried what it's written here:

  sh -c "$(curl -fsSL https://raw.githubusercontent.com/Linuxbrew/install/master/install.sh)"
  
  test -d ~/.linuxbrew && PATH="$HOME/.linuxbrew/bin:$HOME/.linuxbrew/sbin:$PATH"
  test -d /home/linuxbrew/.linuxbrew && PATH="/home/linuxbrew/.linuxbrew/bin:/home/linuxbrew/.linuxbrew/sbin:$PATH"
  test -r ~/.bash_profile && echo "export PATH='$(brew --prefix)/bin:$(brew --prefix)/sbin'":'"$PATH"' >>~/.bash_profile
  echo "export PATH='$(brew --prefix)/bin:$(brew --prefix)/sbin'":'"$PATH"' >>~/.profile
  

  but then brew is still not found:

  bash: brew: command not found
  

• ffmpeg vp9 not setting constant quality

  28 mai 2018, par cclloyd

  I'm running ffmpeg to convert a 4k hevc video to vp9 but no matter what setting I use, it always comes out horrible quality and the same filesize.

  Command:

  ffmpeg -y -i /tmp/longsample.mkv -threads 6 -c:a libopus -c:v libvpx-vp9 -crf 30 /tmp/vp9-30.mkv
  ffmpeg -y -i /tmp/longsample.mkv -threads 6 -c:a libopus -c:v libvpx-vp9 -crf 15 /tmp/vp9-15.mkv
  ffmpeg -y -i /tmp/longsample.mkv -threads 6 -c:a libopus -c:v libvpx-vp9 -crf 0 /tmp/vp9-0.mkv
  

  I'm using the ffmpeg:latest on docker.

• picking a frame and an overlapping audio from a video

  28 mai 2018, par RAVI

  I know how to extract frames and audio from a video using ffmpeg.

  But what I want to is, to pick a random frame in that video, and then picking a random 1 second audio clip that overlaps in time with the sampled frame.

  As of now I'm doing this by preprocessing the videos for frames and audio, but that is consuming a lot of disk-space.

  So is there a easier way of achieving this?