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• Can I use a text file's content to create a filtered list for ffmpeg ?

  20 octobre 2022, par Angel Lopez Jr

  I am attempting to make a CMD script that will

  


  

  1. Create a text file that lists file names followed by video codec (using ffprobe)

  


  2. Create a new text from the list so that any file with x265 codec is removed from the list (and formated as
file "*filepath*"

  


  3. Run ffmpeg on the edited list to transcode remaining files to x265.

  


  


  I have a script that does #1

  


  for /R %%f IN (*.mkv,*.avi,*.mp4,*.m2ts,*.mts,*.rm,*.m4v) do echo "%%f" >>Probe.txt & ffprobe -v error -hide_banner -of default=noprint_wrappers=0 -print_format flat  -select_streams v:0 -show_entries stream=codec_name "%%f" >>Probe.txt & echo.  >>Probe.txt


  


  which outputs

  


  


  "filepath"
  
streams.stream.0.codec_name="codec"

  


  "filepath"
  
streams.stream.0.codec_name="codec"

  


  


  and I have a script that will do #3

  


  for /R %%f IN (*.mkv,*.avi,*.mp4,*.m2ts,*.mts,*.rm,*.m4v) do ffmpeg -hide_banner -hwaccel_output_format qsv -i "%%f" -c:v libx265 -c:a ac3 -x265-params crf=25 "%%f.mkv"


  


  I am not sure if #2 is even possible though.

  


  End result of task 2 should be that in probe.txt, any line that has a
streams.stream.0.codec_name value of anything besides hevc will have the line immediately above it written to a new txt file with the word file in front.

  


  final goal is getting all three tasks to run under one batch file (each task running sequentially)

  


  Is there any help on what I am missing to be able to unify these and get #2 to happen

  


• Invalid data found when processing input on ffmpeg m4s to mp4 transfer

  1er mars 2020, par keith scott

  The result of the power shell window

  I saw a post on here about converting m4s to mp4 and I have followed the steps of concatenating all the files into another m4s file that I called all.m4s and when I use the command ffmpeg -i allm4s.m4s -c copy video.mp4. I made the combined m4s file by coding an exe to add all the m4s files that have the word video in them to the m4s file. Here is the source code written in c# if you compile the code then that is the code I have used to make the m4s

  using System;
  
  using System.Collections.Generic;
  
  using System.Linq;
  
  using System.Text;
  
  using System.Threading.Tasks;
  
  using System.IO;
  
  
  
  namespace files
  
  {
  
      class Program
  
      {
  
          static void Main(string[] args)
  
          {
  
              string dir = Directory.GetCurrentDirectory();
  
              string[] info = Directory.GetFiles(dir);
  
              Console.WriteLine(dir + "\\allm4s.m4s");
  
              Console.ReadKey();
  
              foreach (string name in info)
  
              {
  
                  if (Path.GetFileName(name).Contains(".m4s") && Path.GetFileName(name).Contains("video"))
  
                  {
  
                      using (Stream srcStream = File.OpenRead(name))
  
                      {
  
                          using (Stream destStream = File.OpenWrite(dir+"\\allm4s.m4s"))
  
                          {
  
                              srcStream.CopyTo(destStream);
  
                              Console.WriteLine(destStream+name);
  
                          }
  
                      }
  
                  }
  
              }
  
              Console.ReadKey();
  
          }
  
      }
  
  }

  I think if there is to be an issue it is to do with this allm4s.m4s file as the file size is about 1.5mb even though each segment m4s is about 750kb each and there are quite a lot.If anyone has a way of adding concatenating lots of files together through a program/application that would be useful.

• Does simple rescaling from 1080p to frame height of 720 lead to 720p ?

  12 août 2015, par nburk

  I want to convert a 1080p to 720p and also lower resolutions eventually.

  I have been using ffmpeg for all my video processing activities so far, and would simply approach this task using the following command :

  ffmpeg -i tos.mov -vf scale=-1:720 tos_0x720.mov

  I understand that this will rescale my video to a new frame size having 720 pixels set as a fixed height and the width dynamically calculated.

  What I am not sure about are the implications regarding the quality factors of the video when using ffmpeg this way.

  1. Is it valid to assume that running this command will output a perfect HD 720p quality video ?
  2. What would be a benefit of using dedicated video conversion software to accomplish my goal compared to running the above command ?