Newest 'ffmpeg' Questions - Stack Overflow
Les articles publiés sur le site
-
ffmpeg - I want to concat multiple videos (front / rear) with overlay and one second delay
12 mai, par Andrej FlorjančičI try to write bash script to concat front and rear video files with delay 1 second at start and overlay rear over front.
I wrote the following bash script:
# Define the output file output_file="${VIDEO}/final_output_${choice}.mp4" # Collect and sort the video files front_files=( $(ls *_F.MP4 | sort) ) rear_files=( $(ls *_R.MP4 | sort) ) # Create a file to hold ffmpeg input commands and filter scripts input_list="input_files.txt" filter_script="filter_complex.txt" inputs="" # Clear the input list and filter script files echo "" > "$input_list" echo "" > "$filter_script" # Number of files num_files=${#front_files[@]} # Iterate through the sorted files to build the filter script for i in "${!front_files[@]}"; do echo "file '${front_files[$i]}'" >> "$input_list" echo "file '${rear_files[$i]}'" >> "$input_list" echo "[$((2*i)):v]trim=start=1,scale=1920:1080,setpts=PTS-STARTPTS[f_$i]; [$((2*i)):a]atrim=start=1,asetpts=PTS-STARTPTS[a_$i];" >> "$filter_script" echo "[$((2*i+1)):v]trim=start=1,scale=640:360,setpts=PTS-STARTPTS[r_$i];" >> "$filter_script" # Rear video only echo "[f_$i][r_$i]overlay=x=(main_w-overlay_w-10):y=(main_h-overlay_h-10)[mix_$i];" >> "$filter_script" input+="[mix_$i][a_$i]" done # Concatenate all combined labels echo "${input}concat=n=${#front_files[@]}:v=1:a=1[v][a]" >> "$filter_script" # Run FFmpeg with filter script ffmpeg -f concat -safe 0 -i "$input_list" \ -filter_complex_script "$filter_script" \ -map "[v]" -map "[a]" \ -y "$output_file"This script generates two files input_list.txt:
file '20200826_084407_F.MP4' file '20200826_084407_R.MP4' file '20200826_084708_F.MP4' file '20200826_084708_R.MP4' file '20200826_084910_F.MP4' file '20200826_084910_R.MP4'filter_script.txt:
[0:v]trim=start=1,scale=1920:1080,setpts=PTS-STARTPTS[f_0]; [0:a]atrim=start=1,asetpts=PTS-STARTPTS[a_0]; [1:v]trim=start=1,scale=640:360,setpts=PTS-STARTPTS[r_0]; [f_0][r_0]overlay=x=(main_w-overlay_w-10):y=(main_h-overlay_h-10)[mix_0]; [2:v]trim=start=1,scale=1920:1080,setpts=PTS-STARTPTS[f_1]; [2:a]atrim=start=1,asetpts=PTS-STARTPTS[a_1]; [3:v]trim=start=1,scale=640:360,setpts=PTS-STARTPTS[r_1]; [f_1][r_1]overlay=x=(main_w-overlay_w-10):y=(main_h-overlay_h-10)[mix_1]; [4:v]trim=start=1,scale=1920:1080,setpts=PTS-STARTPTS[f_2]; [4:a]atrim=start=1,asetpts=PTS-STARTPTS[a_2]; [5:v]trim=start=1,scale=640:360,setpts=PTS-STARTPTS[r_2]; [f_2][r_2]overlay=x=(main_w-overlay_w-10):y=(main_h-overlay_h-10)[mix_2]; [mix_0][a_0][mix_1][a_1][mix_2][a_2]concat=n=3:v=1:a=1[v][a]I'w got error:
Input #0, concat, from 'input_files.txt': Duration: N/A, start: 0.000000, bitrate: 11973 kb/s Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 11877 kb/s, 30 fps, 30 tbr, 60k tbn, 60 tbc Metadata: creation_time : 2020-08-26T08:47:07.000000Z handler_name : VideoHandler vendor_id : [0][0][0][0] encoder : h264 Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 32000 Hz, mono, fltp, 96 kb/s Metadata: creation_time : 2020-08-26T08:47:07.000000Z handler_name : SoundHandler vendor_id : [0][0][0][0] Invalid file index 1 in filtergraph description [0:v]trim=start=1,scale=1920:1080,setpts=PTS-STARTPTS[f_0]; [0:a]atrim=start=1,asetpts=PTS-STARTPTS[a_0]; [1:v]trim=start=1,scale=640:360,setpts=PTS-STARTPTS[r_0]; [f_0][r_0]overlay=x=(main_w-overlay_w-10):y=(main_h-overlay_h-10)[mix_0]; [2:v]trim=start=1,scale=1920:1080,setpts=PTS-STARTPTS[f_1]; [2:a]atrim=start=1,asetpts=PTS-STARTPTS[a_1]; [3:v]trim=start=1,scale=640:360,setpts=PTS-STARTPTS[r_1]; [f_1][r_1]overlay=x=(main_w-overlay_w-10):y=(main_h-overlay_h-10)[mix_1]; [4:v]trim=start=1,scale=1920:1080,setpts=PTS-STARTPTS[f_2]; [4:a]atrim=start=1,asetpts=PTS-STARTPTS[a_2]; [5:v]trim=start=1,scale=640:360,setpts=PTS-STARTPTS[r_2]; [f_2][r_2]overlay=x=(main_w-overlay_w-10):y=(main_h-overlay_h-10)[mix_2]; [mix_0][a_0][mix_1][a_1][mix_2][a_2]concat=n=3:v=1:a=1[v][a]What am I doing wrong?
-
Error loading trimmed video produced by FFMPEG
12 mai, par Bryan CartyI've been trying to trim a video using FFMPEG within some javascript code.
The code executes without throwing any errors.
try { const command = `ffmpeg -i ${ CROPPING_DIR + CROPPED_VIDEO_PREFIX + id + ".mp4" } -ss 00:00:04 -to 00:00:06 -c copy ${ CROPPING_DIR + TRIMMED_VIDEO_PREFIX + id + ".mp4" }`; console.log(command); const { stdout, stderr } = await exec(command); return "NA"; } catch (error) { console.error("Error executing ffmpeg command:", error); }In VsCode, I am unable to view the trimmed video. Instead I see 'An error occurred while loading the video file'.
Viewing from the file explorer, no video frames are displayed, but I can see the video progress bar moving.
I've attempted a number of FFMPEG commands but am getting the same result.
ffmpeg -i C:/Users/bryan/Desktop/Other/project/code/project/app/cropping_images/_cropped_d372d8ff-84c8-4cab-9359-513ee6ad7536.mp4 -ss 00:00:04 -to 00:00:06 -c copy C:/Users/bryan/Desktop/Other/project/code/project/app/cropping_images/_trimmed_d372d8ff-84c8-4cab-9359-513ee6ad7536.mp4 ffmpeg -i C:/Users/bryan/Desktop/Other/project/code/project/app/cropping_images/_cropped_87f094f2-b06f-4c21-bd41-ae5e4ca222ae.mp4 -ss 1.05 -to 2.45 -c copy C:/Users/bryan/Desktop/Other/project/code/project/app/cropping_images/_trimmed_87f094f2-b06f-4c21-bd41-ae5e4ca222ae.mp4 ffmpeg -i C:/Users/bryan/Desktop/Other/project/code/project/app/cropping_images/_cropped_f5b89e96-3efc-4a6e-bba4-428751fb38eb.mp4 -ss 0.00 -to 6.93 -c:v copy -c:a copy C:/Users/bryan/Desktop/Other/project/code/project/app/cropping_images/_trimmed_f5b89e96-3efc-4a6e-bba4-428751fb38eb.mp4 -
Losslessly Split Videos by Size [closed]
11 mai, par user1897354How do I losslessly split videos by file size? For example, I have a 1.92GB video and I want to split it into 200MB videos.
I tried using ffmpeg and putting in -fs, -c copy, and 200000000 for 200MB, but I only got one file that's not even the correct file size. How do I properly use it?
-
How to stream only a part of a video without downloading the whole thing ?
11 mai, par AbbasI am building a YouTube video trimmer, and currently, it takes the YouTube video ID, downloads the whole video from the server (Even it is like 10 hours long), and then it trims it according to user's inputted timeframe using
ffmpeg.Now the problem with this is that it takes so much time to download the whole video even if we want a small piece of it hence it is highly impractical.
I was thinking to implement something like an HTML5 video player does when you seek the video forward. It just jumps to the part where you seek-ed to without downloading the part you skipped over. How can I only download a part of a video file from a server in form of a buffer and then generate an already trimmed video file from that? I don't know if that is even possible on the server-side, but video players do it on the client-side.
-
Xvfb records a black screen
11 mai, par VivekI am trying a record a video by running xvfb inside a docker image. No matter what I do it gives me black screen.
Screen size same in xvfb and ffmpeg and puppeteer.
It will would really great if someone can help.
start-xvfb.sh --------------------------------------------------------------------- # Start Xvfb Xvfb :99 -screen 0 1280x720x24 & # Set the display environment variable export DISPLAY=:99 # Run the application (assuming it starts with npm start) npm run devDockerfile
FROM node:lts-alpine3.19 # Install dependencies using apk RUN apk update && \ apk add --no-cache \ gnupg \ ffmpeg \ libx11 \ libxcomposite \ libxdamage \ libxi \ libxtst \ nss \ cups-libs \ libxrandr \ alsa-lib \ pango \ gtk+3.0 \ xvfb \ bash \ curl \ udev \ ttf-freefont \ chromium \ chromium-chromedriver # Set working directory WORKDIR /app # Copy package.json and install dependencies COPY package.json . RUN npm install --force # Copy remaining source code COPY . . # Add a script to start Xvfb COPY start-xvfb.sh /app/start-xvfb.sh RUN chmod +x /app/start-xvfb.sh # Expose the port EXPOSE 4200 EXPOSE 3000 # Command to start Xvfb and run the application CMD ["./start-xvfb.sh"]Below
this is code code that launches puppeteer and from a nodejs application and create spawns a process for ffmpeg
export class UnixBrowserRecorder implements Recorder { url = 'https://stackoverflow.com/questions/3143698/uncaught-syntaxerror-unexpected-token'; // Replace with your URL outputFilePath = `/app/output_video.mp4`; // Output file path within the container durationInSeconds = 6; // Duration of the video in seconds resolution = '1280x720'; public async capture(): Promise{ const browser = await puppeteer.launch({ args: [ '--no-sandbox', // Required in Docker '--disable-setuid-sandbox', // Required in Docker '--disable-dev-shm-usage', // Required in Docker '--headless', // Run browser in headless mode '--disable-gpu', // Disable GPU acceleration `--window-size=${this.resolution}` // Set window size ], executablePath: '/usr/bin/chromium' // Specify the path to Chromium executable }); const page = await browser.newPage(); await page.goto(this.url); await page.screenshot({ "type": "png", // can also be "jpeg" or "webp" (recommended) "path": `/app/screenshot.png`, // where to save it "fullPage": true, // will scroll down to capture everything if true }); //ffmpeg -video_size `DISPLAY=:5 xdpyinfo | grep 'dimensions:'|awk '{print $2}'` -framerate 30 -f x11grab -i :5.0+0,0 output.mpg const ffmpegProcess = spawn('ffmpeg', [ '-video_size', this.resolution, '-framerate', '30', '-f', 'x11grab', '-i', ':99', // Use display :99 (assuming Xvfb is running on this display) '-t', this.durationInSeconds.toString(), '-c:v', 'libx264', '-loglevel', 'debug', '-pix_fmt', 'yuv420p', this.outputFilePath ]); // Log ffmpeg output ffmpegProcess.stdout.on('data', data => { console.log(`ffmpegProcess stdout: ${data}`); }); ffmpegProcess.stderr.on('data', data => { console.error(`ffmpegProcess stderr: ${data}`); }); // Handle ffmpegProcess process exit ffmpegProcess.on('close', code => { console.log(`ffmpeg process exited with code ${code}`); }); // Wait for the duration to complete await new Promise(resolve => setTimeout(resolve, this.durationInSeconds * 1000)); // Close the FFmpeg stream and process ffmpegProcess.stdin.end(); // Close Puppeteer await page.close(); await browser.close(); return "Video generated successfully"; } } 
