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• Looking for segment data in hls output from ffmpeg

  7 novembre 2023, par n0body7331

  Just as the title states. I'm trying to find the raw data that usually gets written to the .ts files. However I don't want to create a playlist or have these files written to disk i any way. I would rather buffer the ffmpeg output and try to somehow parse it to get the same content.

  


  am I going in the wrong direction with this ? Should I be looking for something representing mpgets headers ?

  


  So far this is what I've come up with.

  


  package main

import (
    "bytes"
    "io"
    "log"
    "os/exec"
    "strings"
    "testing"
)

func TestExtractor(t *testing.T) {
    args := "-i https://www.w3schools.com/html/mov_bbb.mp4 -c:v libx264 -crf 21 -preset veryfast -g 25 -sc_threshold 0 -c:a aac -b:a 128k -ac 2 -f hls -sc_threshold 0 -hls_segment_type mpegts -hls_time 2 -"

    cmd := exec.Command("ffmpeg", strings.Split(args, " ")...)
    // Create a pipe to read the FFmpeg output.
    stdout, err := cmd.StdoutPipe()
    if err != nil {
        log.Fatal(err)
    }

    if err := cmd.Start(); err != nil {
        log.Fatal(err)
    }

    s := []byte{
        // Offset 0x0004A543 to 0x0004A5D9
        255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
        255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
        255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
        255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
        255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
        255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
        255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
        255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
        255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
        255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
        255}

    buffer := make([]byte, len(s))

    for {
        n, err := stdout.Read(buffer)
        if err == io.EOF {
            break
        }

        if err != nil {
            log.Fatal(err)
        }

        if bytes.Equal(buffer[:n], s) {
            log.Printf("\nFOUND BUFFER \n %v \n ============= \b", buffer[:n])
        } else {
            //log.Printf("\nNOT FOUND BUFFER \n %v \n ============= \b", buffer[:n])
        }
    }
    if err := cmd.Wait(); err != nil {
        log.Fatal(err)
    }
}



  


• How to create movie screenshot by ffmpeg in an amazon S3 path

  5 décembre 2019, par user2004082

  I tried to create using ffmpeg a video screenshot from a remote video url in heroku console. Below is how I generated a movie instance and can see also an empty ready to be written file at S3. But the last line movie.screenshot is not working and generates this error :

  FFMPEG::Error: Failed encoding.Errors: no output file created

  Here is the code

  s3 = Aws::S3::Resource.new(region: 'us-west-1')
  
  bucket = s3.bucket("ruby-sample-kb-#{SecureRandom.uuid}")
  
  bucket.create
  
  object = bucket.object('ex-vid-test-kb.jpg')
  
  object.put(acl: "public-read-write")
  
  path = object.public_url
  
  movie = FFMPEG::Movie.new("https://www.googleapis.com/download/storage/v1/b/seppoav/o/3606137_51447286560__56BAF29C-05CB-4223-BAE6-655DF2236321.MOV?generation=1492780072394755&alt=media")
  
  movie.screenshot(path, :seek_time => 2)

  I also tried the following line just if it should be written via put. What am I missing here ?

  object.put(acl: "public-read", body: movie.screenshot(path, :seek_time => 2))

• Is it possible to use FFMPEG to generate F4V videos ?

  10 juillet 2012, par James Raber

  I need to generate a script that converts videos to F4V's for use with Flash Media Server 4.5...is this possible ? I have it converting files to MP4s and then swapping the extension. This works fine, but seems like a dirty work around. I'd prefer to use a generate a true F4V. I've heard mixed things on whether or not ffmpeg truly supports F4Vs. Any guidance would be appreciated. Also, is there a doc guide on what file formats are allowed by FFMPEG ?