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• Creating a single video using extracted frames from several video clips without having to write the frames into a folder

  24 décembre 2023, par Athekul

  I have a set of mp4 video clips named : file1.mp4, file2.mp4,..filen.mp4.
I want to write a code for going through the files sequentially and extracting a frame every 10 seconds of the video.
Then I want to combine the frames and make one output video file at 6 fps.

  


  I have the code which does that but it extracts frames and stores them in a subfolder before combining them into a video. I think that is inefficient.
Is there a way whereby I can extract frames from the video clips and output the final video without having to store the frames in a folder ?

  


  This is the code that I have.

  


  #!/bin/bash

# Step 1: Extract frames every 10 seconds
input_folder="/home/aj/Videos/merge"
output_folder="/home/aj/Videos/merge"
subfolder="frames"

# Create subfolder if it doesn't exist
mkdir -p "$output_folder/$subfolder"

# Get the total number of input files
total_files=$(find "$input_folder" -maxdepth 1 -type f -name "*.mp4" | wc -l)
processed_files=0
global_frame_counter=0

# Iterate through mp4 files in the input folder
for file in "$input_folder"/*.mp4; do
  filename=$(basename "$file")
  filename_no_ext="${filename%.mp4}"

  # Extract frames every 10 seconds
  ffmpeg -i "$file" -vf fps=1/10 "$output_folder/$subfolder/output_${global_frame_counter}%02d.png"
  
    # Increment the global frame counter
  ((global_frame_counter ++))

  # Increment the processed files count
  ((processed_files++))

  # Calculate and echo the percentage of files processed
  percentage=$((processed_files * 100 / total_files))
  echo -e "\033[1;32mProcessing: $percentage% complete\033[0m"
done

# Step 2: Combine frames into a single video
cd "$output_folder/$subfolder" || exit

ffmpeg -r 6 -f image2 -s 1920x1080 -i "output_%*.png" -vcodec libx264 -crf 25 -pix_fmt yuv420p "$output_folder/result.mp4"

echo "Frames extracted and video created successfully."



  


• Show video while saving it

  13 septembre 2022, par Mohamed Adel El-Badry

  I have a folder full of images, I need to save these images into the video while doing so I want to show the user the video being played from these images (frames). I can run two separate processes one for the saving and one for the showing but this is not what I am looking for, I want to do both in one step. If you know a solution please let me know.

  


  My code uses C++ with OpenCV but feel free to share with me any code written with any language, or event a concept.

  


  I use gStreamer, ffmpeg as well for the video generation, so I am not looking how to save a video or how to show the video I am looking for a process that can do both in one operation.

  


• Revision 53844275e9 : Fix potential ioc issue in vp9_get_prob for 4K above sizes This commit turns on

  25 juillet 2014, par Jingning Han

  Changed Paths :
   Modify /test/frame_size_tests.cc

  
   Modify /vp9/common/vp9_prob.h

  
  
  Fix potential ioc issue in vp9_get_prob for 4K above sizes

  This commit turns on the existing vp9_get_prob function using
  64 bit in the intermediate step. It fixes the ioc issue for 4K
  above frame sizes (issue 828).

  Change-Id : I9f627f3beca2c522f73b38fd2a3e7eefdff01a7c