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• How to make VideoCodec.Raw with Accord.Video.FFMPEG ?

  13 décembre 2020, par ryanm8227

  I have succeeded with VideoCodec.MPEG4 but unfortunately, the video quality is terrible :

  


  using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Accord.Video.FFMPEG;

namespace Screen_Recorder
{
    public partial class Form1 : Form
    {
        Timer timer1 = new Timer();
        VideoFileWriter vf = new VideoFileWriter();

        System.Random r = new System.Random();

        long rnd(double a, double b)
        {
            return Convert.ToInt64(a + r.NextDouble() * (b - a));
        }

        public Form1()
        {
            InitializeComponent();
            timer1.Interval = 10;
            timer1.Tick += Timer1_Tick;

            vf.Open(Convert.ToString(rnd(9999999999999999, 1000000000000000)) + ".mp4", 1920, 1080, 25, VideoCodec.MPEG4, 1000000);
            
        }

        private void Timer1_Tick(object sender, EventArgs e)
        {
            Bitmap bp = new Bitmap(1920, 1080);
            Graphics gr = Graphics.FromImage(bp);
            gr.CopyFromScreen(0, 0, 0, 0, new Size(bp.Width, bp.Height));

            pictureBox1.Image = bp;
            pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;

            vf.WriteVideoFrame(bp);
        }

        private void buttonStartRecording_Click(object sender, EventArgs e)
        {
            timer1.Start();
        }

        private void buttonStopRecording_Click(object sender, EventArgs e)
        {
            timer1.Stop();
            vf.Close();
        }
    }
}


  


  That being said, I would like to try making the video without the MPEG4, but with RAW, which is simply a non-compressed video. I expect the size to be pretty big, but that is not an issue.

  


• dts to m4a (aac) ffmpeg to qaac output issue

  10 avril 2014, par user8979

  Looking to encode 2 dts 5.1 audio sources (Sonic Landscape and The Digital Experience) to m4a (aac) 5.1 with qaac 2.35. Input piped to qaac using :

  ffmpeg -report -loglevel verbose -i "input.file" -vn -f wav -codec:a pcm_f32le - | qaac --cvbr 160 --quality 2 --rate=keep --ignorelength --no-delay - -o "output.m4a"

  • Sonic Landscape duration : 18.848s, qaac output duration : 18.859s

    • output .m4a duration mismatch
    • mediainfo reports output is 2ch while mediatab and ffmpeg report output is 5.1ch (lfe)
      
      

  • The Digital Experience duration : 32.875s, qaac output duration : 32.875s

    • mediainfo reports output is 2ch while mediatab and ffmpeg report output is 5.1ch (lfe)
      
      

  1. what caused the duration mismatch in the first one ? how can it be fixed ?
  2. is the output 2ch or 5.1ch ?
     
     • if it is 2ch, what qaac option(s) leave the channels in output same as input ?
     • if the output is 5.1ch, does qaac then always preserve channels unless explicitly told otherwise ?

• FFmpeg Throwing Up Error After Concat Attempt [closed]

  8 mai 2021, par OrdinaryCarrot16

  I am trying to convert my DVDs using FFmpeg, while doing additional filtering and concatenation. The script I am making is very WIP, but it isn't working at the moment. It throws up the error : "No such filter : ''
Error initializing complex filters.
Invalid argument"

  


  Am I using the correct syntax ?

  


  :: Generate dummy file with blank video & audio streams (for spacing out portions when concating)
ffmpeg -y -f lavfi -i color=size=720x480:color=black:rate=30 -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100 -c:a aac -c:v libx264 -t 1 spacer_1_tmp.mkv
ffmpeg -y -f lavfi -i color=size=720x480:color=black:rate=30 -f lavfi -i anullsrc=channel_layout=stereo:sample_rate=44100 -c:a aac -c:v libx264 -t 2 spacer_2_tmp.mkv

:: Extract intro
ffmpeg -y -avoid_negative_ts make_non_negative -ss 00:00:01 -to 00:00:24.900 -i "ADVENTURE TIME SEASON 1 DISC 1_t00.mkv" -c:v libx264 -crf 8 -preset veryfast -c:a aac -b:a 192k intro_tmp.mkv

:: Extract title card, episode, and credits
ffmpeg -y -avoid_negative_ts make_non_negative -ss 00:00:25.850 -to 00:00:32.500 -i "ADVENTURE TIME SEASON 1 DISC 1_t00.mkv" -c:v libx264 -crf 8 -preset veryfast -c:a aac -b:a 192k title_card_tmp.mkv
ffmpeg -avoid_negative_ts make_non_negative -ss 00:00:32.900 -to 00:11:16.950 -i "ADVENTURE TIME SEASON 1 DISC 1_t00.mkv" -c:v libx264 -crf 8 -preset veryfast -c:a aac -b:a 192k episode_tmp.mkv
ffmpeg -y -avoid_negative_ts make_non_negative -ss 00:11:17.950 -to 00:11:50.900 -i "ADVENTURE TIME SEASON 1 DISC 1_t00.mkv" -c:v libx264 -crf 8 -preset veryfast -c:a aac -b:a 192k credits_tmp.mkv

:: Merge all extracted components and encode into final video
ffmpeg -i spacer_1_tmp.mkv -i intro_tmp.mkv -i spacer_2_tmp.mkv -i title_card_tmp.mkv -i spacer_2_tmp.mkv -i episode_tmp.mkv -i spacer_2_tmp.mkv -i credits_tmp.mkv -i spacer_1_tmp.mkv -filter_complex "[0:0]setsar=1[v1];[0:1][a1];[1:0]setsar=1[v2];[1:1][a2];[2:0]setsar=1[v3];[2:1][a3];[3:0]setsar=1[v4];[3:1][a4];[4:0]setsar=1[v5];[4:1][a5];[5:0]setsar=1[v6];[5:1][a6];[6:0]setsar=1[v7];[6:1][a7];[7:0]setsar=1[v8];[7:1][a8];[8:0]setsar=1[v9];[8:1][a9];[v1][v2][v3][v4][v5][v6][v7][v8][v9][a1][a2][a3][a4][a5][a6][a7][a8][a9]concat=n=9:v=1:a=1[fv][fa]" -map "[fv]" -map "[fa]" -c:v libx264 -crf 20 -c:a aac -b:a 160k "Slumber Party Panic (S01E02).mp4"

pause