Recherche avancée

Sur d’autres sites (5514)

• How to clone last frame when using overlay in ffmpeg ? [closed]

  6 mai 2024, par mikezang

  I use this code to slide previous and next pages up, this is no problems, can I remove png file 1970～1979-last.png and use the last frame of video file 1970～1979.mp4 to instead it ?

  


  script-01.txt

  


  color=white:864x504[c];
[0:v]scale=864:504:force_original_aspect_ratio=decrease,pad=864:504:-1:-1,setsar=1[s0];
[1:v]scale=864:504:force_original_aspect_ratio=decrease,pad=864:504:-1:-1,setsar=1[s1];
[c][s0]overlay=y=0-h*t[c];
[c][s1]overlay=y='if(between(t,0,18),max(H-h*t,0),max(0-h*(t-18),0-H))'[v],
[v]tpad=stop_mode=clone:stop_duration=10[s2];
[s2]drawtext=fontfile='/WINDOWS/Fonts/Arial.ttf':text='%{eif\:18-t\:d}':
box=1:boxborderw=10:boxcolor=orange@0.4:
x=w-tw-10:y=10:fontsize=24:fontcolor=red:enable='between(t,8,18)';


  


  script-01.bat

  


  ffmpeg -hide_banner -loglevel fatal ^
    -loop 1 -i "C:\myimages\1970～1979-last.png" ^
    -i "C:\myvideos\years\1980～1989.mp4" ^
    -filter_complex_script script-01.txt ^
    -t 18 -y v01.mp4


  


  I got it what I only need video files and capture last frame by pipe line to next step, so that the last frame image never neede ! Though the first slide has little problem when countdown finished !

  


  script-01.bat

  


  ffmpeg -hide_banner -loglevel fatal ^
    -sseof -0.03 -i "C:\myvideos\years\1970～1979.mp4" ^
    -vframes 1 -c:v png -f image2pipe - | ffmpeg  ^
    -hide_banner -loglevel fatal -i - ^
    -i "C:\myvideos\years\1980～1989.mp4" ^
    -filter_complex_script script-01.txt ^
    -t 18 -y v01.mp4


  


• How can I add chapters to a mp4 file using bash script and ffmpeg

  17 septembre 2023, par Rick T

  I'm trying to add chapters to an mp4 file using bash and ffmpeg. The chapters are located in a file called chapters.txt. When the bash script is run which is called add_chapters.sh it reads the chapters.txt file and creates a file called chapters.ffmetadata. The issue is that the START and END times in the file chapters.ffmetadata aren't being created correctly. How can I fix this ?

  


  


  1. I have a file called chapters.txt that has the chapters in it.

     


     00:00:00=Intro
00:02:12=What are selections
00:03:19=Booleans


     


  


  2. The bash file I run is add_chapters.sh

     


     The code in it is :

     


     #!/bin/bash

input_file="chapters.txt"
output_file="chapters.ffmetadata"

# Create the FFmetadata chapter file
echo ";FFMETADATA1" > "$output_file"

previous_seconds=0

while IFS="=" read -r timestamp chapter_name; do
    # Convert start time to seconds
    seconds=$(date -u -d "1970-01-01 $timestamp" +"%s")

    # Calculate the end time (previous chapter's start time)
    end_seconds=$previous_seconds

    # Update previous_seconds for the next iteration
    previous_seconds=$seconds

    echo "[CHAPTER]" >> "$output_file"
    echo "TIMEBASE=1/1000" >> "$output_file"
    echo "START=${end_seconds}000" >> "$output_file"
    echo "END=${seconds}000" >> "$output_file"
    echo "title=$chapter_name" >> "$output_file"
done < "$input_file"

echo "Chapter file '$output_file' created successfully."

# Run FFmpeg to add chapters to the video
ffmpeg -i input_video.mp4 -i chapters.ffmetadata -map_metadata 1 -c:v copy -c:a copy -y output_video.mp4


     


  


  3. It creates a file called chapters.ffmetadata

     


     ;FFMETADATA1
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=0000
title=Intro
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=132000
title=What are selections
[CHAPTER]
TIMEBASE=1/1000
START=132000
END=199000
title=Booleans
[CHAPTER]
TIMEBASE=1/1000
START=199000
END=0000
title=


     


     The START and END times aren't being calculated correctly. How can I fix this ?

     


  


  


  ---

  


  UPDATE #1

  


  I'm almost there thanks to @Freeman code / answer.

  


  The issues in the generated
chapters.ffmetadata file are just.

  


  


  1. The first START= and END= are 0000

     


  


  2. The Intro Chapter doesn't show up (most likely caused by the first START= and END= being 0000)

     


  


  3. The Chapters seem to be shifted down by one timecode line (most likely caused by the first START= and END= being 0000)

     


      ;FFMETADATA1
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=0000
title=Intro
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=132000
title=What are selections ?
[CHAPTER]
TIMEBASE=1/1000
START=132000
END=199000
title=Booleans
[CHAPTER]
TIMEBASE=1/1000
START=199000
END=0000
title=
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=4459000
title=

     


  


  


  ---

  


  UPDATE #2

  


  Strange ; I tried the changes @Freeman suggested but an error comes up now.

  


  Chapter end time 0 before start 199000
chapters.ffmetadata : Cannot allocate memory

  


  ;FFMETADATA1
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=0000
title=Intro
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=132000
title=What are selections?
[CHAPTER]
TIMEBASE=1/1000
START=132000
END=199000
title=Booleans
[CHAPTER]
TIMEBASE=1/1000
START=199000
END=0000
title=
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=4459000
title=


  


  ---

  


  UPDATE #3 using his awk changes

  


  ;FFMETADATA1
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=0000
title=Intro
[CHAPTER]
TIMEBASE=1/1000
START=0000
END=132000
title=What are selections?
[CHAPTER]
TIMEBASE=1/1000
START=132000
END=199000
title=Booleans
[CHAPTER]
TIMEBASE=1/1000
START=199000
END=0000
title=


  


• FFmpeg error with ffmpeg.FS("readfile", "output.mp4"). trying to get ffmpeg to work in the react app

  21 juin 2024, par Paul Tham

   const stackVideos = useCallback(
    async (video1) => {
      try {
        console.log("Fetching video2 from storage...");
        const video2Ref = ref(storage, "video2.mp4");
        const video2Url = await getDownloadURL(video2Ref);
        const video2Blob = await (await fetch(video2Url)).blob();

        console.log("Writing video1 to FFmpeg FS...");
        await ffmpeg.FS("writeFile", "video1.mp4", await fetchFile(video1));

        console.log("Writing video2 to FFmpeg FS...");
        await ffmpeg.FS("writeFile", "video2.mp4", await fetchFile(video2Blob));

        console.log("Files in FFmpeg FS after write:");
        const files = await ffmpeg.FS("readdir", "/");
        console.log(files);

        const { start, end } = inputs[0];
        const startSeconds = new Date(`1970-01-01T${start}Z`).getTime() / 1000;
        const endSeconds = new Date(`1970-01-01T${end}Z`).getTime() / 1000;
        const duration = endSeconds - startSeconds;

        console.log("Running FFmpeg command...");
        await ffmpeg.run(
          "-i",
          "video1.mp4",
          "-ss",
          startSeconds.toString(),
          "-t",
          duration.toString(),
          "-i",
          "video2.mp4",
          "-filter_complex",
          "[0:v]scale=1080:-1[v1];[1:v]scale=-1:1920/2[v2scaled];[v2scaled]crop=1080:1920/2[v2cropped];[v1][v2cropped]vstack=inputs=2,scale=1080:1920[vid]",
          "-map",
          "[vid]",
          "-map",
          "0:a",
          "-c:v",
          "libx264",
          "-crf",
          "23",
          "-preset",
          "veryfast",
          "-shortest",
          "output1.mp4"
        );

        console.log("Files in FFmpeg FS after run:");
        const filesAfterRun = await ffmpeg.FS("readdir", "/");
        console.log(filesAfterRun);

        console.log("Reading output1.mp4 from FFmpeg FS...");
        const data = await ffmpeg.FS("readfile", "output1.mp4");
        console.log("after the FS readfile");
        const url = URL.createObjectURL(
          new Blob([data.buffer], { type: "video/mp4" })
        );
        setStackedVideo(url);
        setOutputFileReady(true); // Mark output file as ready
      } catch (err) {
        console.error("FFmpeg error output:", err);
        setError(`FFmpeg run error: ${err.message}`);
        setIsProcessing(false);
      }
    },
    [inputs]
  );


  


  My error seems to be stemming from this line :

  


   const data = await ffmpeg.FS("readfile", "output1.mp4");


  


  Seeing the ffmpeg.wasm documentation i thought the functions for some of the functions had changed, but when I changed it, it seemed like they did not recognise the new functions. Sometimes this will also give me some other errors like worker.js which I dont understand enough to debug this myself.

  


  words word words words words words word words words wordswords word words words wordswords word words words wordswords word words words wordswords word words words wordswords word words words words