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• What does the summary output of the coding with ffmpeg means

  12 novembre 2015, par Jai

  I am working with video comparison using ffmpeg. By Using ffmpeg command I can find the difference between 2 videos. But i want to find the percentage different in 2 videos.
  From the below ffmpeg output how can i found the percentage difference in two videos. Which attribute denote the difference.?

  TaskList: video:530kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.266679%
  
  TaskList: [libx264 @ 0000000002750b00] frame I:2     Avg QP:23.92  size: 29796
  
  TaskList: [libx264 @ 0000000002750b00] frame P:97    Avg QP:22.97  size:  4477
  
  TaskList: [libx264 @ 0000000002750b00] frame B:9     Avg QP:28.16  size:  5338
  
  TaskList: [libx264 @ 0000000002750b00] consecutive B-frames: 83.3% 16.7%  0.0%  0.0%
  
  TaskList: [libx264 @ 0000000002750b00] mb I  I16..4: 25.7% 37.8% 36.5%
  
  TaskList: [libx264 @ 0000000002750b00] mb P  I16..4:  1.9%  4.5%  1.0%  P16..4: 26.7%  8.8%  3.8%  0.0%  0.0%    skip:53.3%
  
  TaskList: [libx264 @ 0000000002750b00] mb B  I16..4:  0.7%  2.4%  2.7%  B16..8: 19.9%  8.8%  2.6%  direct: 4.7%  skip:58.2%  L0:32.3% L1:53.2% BI:14.4%
  
  TaskList: [libx264 @ 0000000002750b00] 8x8 transform intra:55.1% inter:69.5%
  
  TaskList: [libx264 @ 0000000002750b00] coded y,uvDC,uvAC intra: 55.6% 70.0% 24.2% inter: 19.8% 26.7% 2.5%
  
  TaskList: [libx264 @ 0000000002750b00] i16 v,h,dc,p: 25% 44%  5% 27%
  
  TaskList: [libx264 @ 0000000002750b00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 24% 26% 17%  5%  5%  6%  5%  6%  6%
  
  TaskList: [libx264 @ 0000000002750b00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 29% 13%  5%  5%  6%  5%  6%  5%
  
  TaskList: [libx264 @ 0000000002750b00] i8c dc,h,v,p: 44% 30% 20%  5%
  
  TaskList: [libx264 @ 0000000002750b00] Weighted P-Frames: Y:6.2% UV:4.1%
  
  TaskList: [libx264 @ 0000000002750b00] ref P L0: 64.2% 28.5%  5.8%  1.3%  0.1%
  
  TaskList: [libx264 @ 0000000002750b00] ref B L0: 88.4% 11.6%
  
  TaskList: [libx264 @ 0000000002750b00] kb/s:1204.25

• 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."



  


• how to capture continuous Realtime progress stream of output (from ffmpeg)

  6 décembre 2022, par user206904

  I am having trouble showing the progress of ffmpeg through my script. I compile my script to exe with ps2exe and ffmpeg output on standard error instead of outputting on standard out
So I used to pipe 1 option

  


  my script.ps1 now is :

  


  # $nb_of_frames= #some_int
& $ffmpeg_path -progress pipe:1 -i input.mp4 -c:v libx264 -pix_fmt yuv420p -crf 25 -preset fast -an output.mp4


  


  then I compile it with ps2exe. (to reproduce you don't need the compile, just use the above command with pipe:1 directly in cmd or PowerShell you will get the same behavior)

  


  Normally with ffmpeg you get a progress reporting (that is interactive), one line containing the information and it keeps getting updated as 1 single line without spamming the console with 100s of lines, it looks like this.

  


  frame= 7468 fps=115 q=22.0 size=   40704kB time=00:05:10.91 bitrate=1072.5kbits/s speed= 4.8x


  


  But this does not appear in the compiled version of my script, so after digging I added -progress pipe:1 to get the progress to appear on std out

  


  Now I get a continuous output every second that looks like this :

  


  frame=778
fps=310.36
stream_0_0_q=16.0
bitrate= 855.4kbits/s
total_size=3407872
progress=continue
...
frame=1092
fps=311.04
stream_0_0_q=19.0
bitrate= 699.5kbits/s
total_size=3932160
progress=continue 


  


  I would like to print some sort of updatable percentage out of this, I can compute a percentage easily if I can capture that frame number, but in this case, I don't know how to capture a real-time output like this and how to make my progress reporting update 1 single line of percentage in real-time (or some progress bar via symbols) instead of spamming on many lines

  


  (or if there is a way to make the default progress of FFmpeg appear in the compiled version of my script that would work too)

  


  edit : a suggestion based on the below answer

  


  #use the following lines instead of write-progress if using with ps2exe
            #$a=($frame * 100 / $maxFrames)
            #$str = "#"*$a
            #$str2 = "-"*(100-$a)
            #Write-Host -NoNewLine "`r$a% complete | $str $str2|"



  


  Thanks