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• Why does my ffmpeg command fails from python subprocess ? [closed]

  23 mars 2024, par haggi krey

  I want to concat two movies with ffmpeg. In the shell I can execute this :
\\programs\2d\ffmpeg\inst\ffmpeg.bat -y -i "concat:C:/daten/movieA.ts1|C:/daten/movieB.ts2" -c copy -bsf:a aac_adtstoasc C:/daten/movieConcat.mov and it works fine. If I try to call it from a python subprocess :

  


  import subprocess
cmd = [r"\\programs\2d\ffmpeg\inst\ffmpeg.bat", "-i", '"concat:C:/daten/movieA.ts1|C:/daten/movieB.ts2"', "-c", "copy", "-bsf:a aac_adtstoasc", "C:/daten/movieConcat.mov"]
result = subprocess.run(cmd, shell=True, capture_output=True, text=True)
if result.returncode > 0:
    print("create concat failed")
print(result.stdout)
print(result.stderr)


  


  I get this error :

  


  Trailing option(s) found in the command: may be ignored.
[in#0 @ 00000222c056a1c0] Error opening input: Invalid argument
Error opening input file "concat:C:/daten/movieA.ts1|C:/daten/movieB.ts2".
Error opening input files: Invalid argument


  


  I have no idea what's wrong with my call and I'd appreciate any hints.

  


• Getting the total samples of an audio file using ffmpeg.exe in C#

  12 juillet 2023, par hello world

  I'm currently working on a C# project where I need to determine the total number of samples in an audio file using ffmpeg.exe. I've been attempting to achieve this by executing the ffmpeg.exe command within my C# code and parsing the output, but I haven't been successful so far.

  


  Here's the code I've tried :

  


  using System;
using System.Diagnostics;

public class AudioUtils
{
    public static int GetTotalSamples(string audioFilePath)
    {
        string ffmpegPath = "path/to/ffmpeg.exe"; // Path to ffmpeg.exe

        Process process = new Process();
        ProcessStartInfo startInfo = new ProcessStartInfo
        {
            FileName = ffmpegPath,
            Arguments = $"-i \"{audioFilePath}\" -af \"volumedetect\" -vn -sn -dn -f null /dev/null 2>&1",
            RedirectStandardOutput = true,
            RedirectStandardError = true,
            UseShellExecute = false,
            CreateNoWindow = true
        };

        process.StartInfo = startInfo;
        process.Start();

        string output = process.StandardError.ReadToEnd();
        process.WaitForExit();

        int totalSamples = 0;
        // Parsing logic to extract total samples from output goes here...

        return totalSamples;
    }
}


  


  I suspect there might be an issue with the command or the parsing logic in the code snippet above. Could someone please guide me on how to correctly execute ffmpeg.exe and extract the total number of samples from the output in C# ? Any insights, alternative approaches, or modifications to the code would be greatly appreciated. Thank you in advance for your assistance !

  


• How can i make the dashjs player respect the stream window from ffmpeg ?

  7 mars 2021, par Octavia Kitsune

  I created the following command to i run on the serverside turn a source url into a cmaf dash stream :

  


  ffmpeg -loglevel error -re -i SOURCEURL -c copy -f dash -dash_segment_type mp4 -remove_at_exit 1 -seg_duration 2 -target_latency 1 -frag_type duration -frag_duration 0.1 -window_size 10 -extra_window_size 3 -streaming 1 -ldash 1 -use_template 1 -use_timeline 0 -index_correction 1 -tune zerolatency -fflags "+nobuffer+flush_packets" -format_options "movflags=cmaf" -adaptation_sets "id=0,streams=0 id=1,streams=1" -utc_timing_url "http://time.akamai.com/?iso&ms" stream/main.mpd


  


  And on the clientside i run a dashjs player with the following configuration :

  


    const video = document.getElementById('video')
  const player = dashjs.MediaPlayer().create()

  player.initialize(video, false, true)
  player.updateSettings({
    streaming: {
      stallThreshold: 0.05,
      lowLatencyEnabled: true,
      liveDelay: 1,
      liveCatchup: {
        minDrift: 1,
        playbackRate: 0.3,
        mode: 'liveCatchupModeDefault'
      },
      abr: {
        useDefaultABRRules: true,
        ABRStrategy: 'abrLoLP',
        fetchThroughputCalculationMode:
          'abrFetchThroughputCalculationMoofParsing'
      }
    }
  })


  


  My problem is, that dashjs loads a few segements and then tries to grab segments that error with a 404. It seems the segments it asks for fall out ot the window the stream defines.

  


  So i wonder how i can align my dashjs with my stream configuration so that it does respect the window defined by the stream, to basically simulate a livestream from any kind of videosource ?