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• Ffmpeg ouputting empty file to s3 when editing a remote video clip on AWS Lambda function

  8 août 2023, par enjoysturtles

  I'm trying to take a clip from a remote url, use ffmpeg to edit it, and save the result to s3.

  


  I have a layer installed with ffmpeg attached to a lambda function. The lambda function runs an ffmpeg script on it and uploads the result to S3, however, the file size is either much smaller than it should be, or 0 bytes.

  


  Locally, the code works perfectly, and it's outputting 500kb files into lambda. I'm running python 3.9 locally as well as on the lambda.

  


  I thought that the file was not downloading fully before ffmpeg begins processing, which would explain the much smaller output file sizes.

  


  I tried downloading the remote file to the lambda's /tmp and using that as the input for ffmpeg, but I continued having the same issue with the empty file.

  


  Here's all the code in my lambda function :

  


  import json
import subprocess
import shlex
import boto3
from datetime import datetime

def lambda_handler(event, context):
    download_url = 'https://newslater-resources.s3.us-west-2.amazonaws.com/ca4a9d5b-691a-49cc-90aa-15636c222017.mov'

    s3 = boto3.client(
      's3',
      region_name="us-east-1",
    )

    key = '/edits/%s.mov' % int(datetime.utcnow().timestamp())

    command='''
      /opt/bin/ffmpeg -i %s \
        -vf "crop=w=in_h*9/16:h=in_h,scale=1080x1920" \
        -vcodec libx264 \
        -crf 23 \
        -preset veryfast \
        -c: a copy \
        -s 1080x1920 \
         - -y
    ''' % (download_url)

    split_command = shlex.split(command)

    p1 = subprocess.run(split_command, stdout=subprocess.PIPE, stderr=subprocess.PIPE)

    response = s3.put_object(Body=p1.stdout, Bucket='edited-clips', Key=key)

    signed_url = s3.generate_presigned_url(
      ClientMethod='get_object',
      Params={
        'Bucket': 'edited-clips',
        'Key': key,
      } 
    )


  


  Any help would be greatly appreciated. Thank you !

  


• Issue with creating an empty video and adding images using FFmpeg in C#

  14 juillet 2023, par hello world

  I'm working on a C# project where I need to create an empty video file and then add images to it using FFmpeg. However, the code I have implemented doesn't seem to be working as expected.

  


  Here's the code snippet I have :

  


  using System;
using System.Diagnostics;
using System.Drawing;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace VideoProcessingApp
{
    public partial class MainForm : Form
    {
        private bool render = false;

        public MainForm()
        {
            InitializeComponent();
        }

        private async void button6_Click(object sender, EventArgs e)
        {
            ProcessStartInfo createVideoInfo = new ProcessStartInfo
            {
                FileName = "ffmpeg.exe",
                Arguments = $"-f lavfi -i nullsrc -t 10 -s {pictureBox2.Width}x{pictureBox2.Height} -r 30 -c:v libx264 output.mp4",
                UseShellExecute = false,
                RedirectStandardOutput = true,
                RedirectStandardError = true,
                CreateNoWindow = true
            };

            using (Process createVideoProcess = new Process())
            {
                createVideoProcess.StartInfo = createVideoInfo;
                createVideoProcess.Start();

                render = true;
                await Task.Run(() =>
                {
                    for (int i = 0; i < 10; i++)
                    {
                        if (!render)
                            break;

                        Bitmap bmp = new Bitmap(1, 1);
                        pictureBox1.Invoke((MethodInvoker)(() =>
                        {
                            bmp = (Bitmap)pictureBox1.Image.Clone();
                        }));

                        while (bmp == pictureBox1.Image)
                        {
                            Thread.Sleep(10);
                        }

                        bmp.Save("a.jpg");

                        ProcessStartInfo addImageInfo = new ProcessStartInfo
                        {
                            FileName = "ffmpeg.exe",
                            Arguments = $"-i output.mp4 -i a.jpg -filter_complex \"overlay=10:10\" -c:v libx264 -c:a copy -f mp4 -",
                            UseShellExecute = false,
                            RedirectStandardOutput = true,
                            RedirectStandardError = true,
                            RedirectStandardInput = true,
                            CreateNoWindow = true
                        };

                        using (Process addImageProcess = new Process())
                        {
                            addImageProcess.StartInfo = addImageInfo;
                            addImageProcess.Start();

                            addImageProcess.WaitForExit();
                        }
                    }
                });
            }

            File.Delete("a.jpg");
        }
    }
}


  


  In this code, I'm attempting to create an empty video by executing an FFmpeg command to generate a nullsrc video. Then, I'm using a loop to capture images from a PictureBox control and overlay them onto the video using FFmpeg.

  


  The issue I'm facing is that the video is not being created at all. I have verified that FFmpeg is installed on my system and the paths to the FFmpeg executable are correct.

  


  I would appreciate any insights or suggestions on what could be causing this issue and how to resolve it. Thank you !

  


• log file of ffmpeg's subprocess STDOUT always empty

  20 juillet 2023, par Mohamed Darwesh

  why is the log file always empty ?
I'm just trying to capture the "time=" from ffmpeg, but I need to make sure it captures the output first, which it doesn't.

  


  import ffmpeg
import subprocess

input_video = ffmpeg.input("test.mp4") 
audio_stream = input_video.audio
video_stream = input_video.video

output_stream = ffmpeg.output(video_stream, audio_stream, 'test_COMPRESSED.mp4', crf=28, vcodec='libx264', vsync=2)

cmd = ' '.join(ffmpeg.compile(output_stream, overwrite_output=True))
process = subprocess.Popen(
    cmd,
    shell=True,
    stdin=subprocess.PIPE,
    stdout=subprocess.PIPE,
    text=True
)

while process.poll() is None:
    with open('log.txt', 'a') as log_file:
        for line in process.stdout:
            output_line = line.strip()
            log_file.write(output_line + '\n')