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• Error while concating mkv files using ffmpeg in cygwin based shell script

  21 mars 2016, par rishi007bansod

  I have written cygwin based shell script to concate 2 .mkv files as below,

  #!/bin/sh
  
  ffmpeg -f concat -i concat.txt -codec copy out.mkv

  concat.txt contains path to 2 mkv files to be concatenated

  file '../temp/1'
  
  file '../temp/2'

  when I run script from cygwin terminal I get following error

  Rishi@Rishikesh /cygdrive/i/video/Interface_code/Testing_function/bin
  
  $ . script.sh
  
  ffmpeg version 2.5.2 Copyright (c) 2000-2014 the FFmpeg developers
  
  built on Dec 30 2014 17:13:24 with gcc 4.9.2 (GCC)
  
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-    avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --  enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
  
  libavutil      54. 15.100 / 54. 15.100
  
  libavcodec     56. 13.100 / 56. 13.100
  
  libavformat    56. 15.102 / 56. 15.102
  
  libavdevice    56.  3.100 / 56.  3.100
  
  libavfilter     5.  2.103 /  5.  2.103
  
  libswscale      3.  1.101 /  3.  1.101
  
  libswresample   1.  1.100 /  1.  1.100
  
  libpostproc    53.  3.100 / 53.  3.100
  
  Guessed Channel Layout for  Input Stream #0.1 : stereo
  
  Input #0, concat, from 'concat.txt':
  
  Duration: N/A, start: 0.000000, bitrate: 1536 kb/s
  
  Stream #0:0: Video: h264 (High), yuv420p, 720x576 [SAR 1:1 DAR 5:4], 25 fps,     25 tbr, 1k tbn, 50 tbc
  
  Stream #0:1: Audio: pcm_s16le, 48000 Hz, 2 channels, s16, 1536 kb/s
  
  'NULL @ 04780280] Unable to find a suitable output format for 'out.mkv
  
  : Invalid argument

  another thing to add, if I run this command from cygwin terminal directly(instead of calling it through script) it runs correctly and creates concatenated output .mkv file

• rtl_fm stream with ffmpeg and low bandwith

  13 février 2019, par Felix Bäder

  I currently try to stream audio from rtl_fm via ffmpeg to node-media-server.

  This is working fine.

  rtl_fm -f 103.0M -M fm -s 44.1k -A std -l 1 -g 40 |
  
  ffmpeg -f s16le -ac 1 -i pipe:0 -f flv rtmp://192.168.178.42/live/lorem

  But :
  The I want to listen to the signal from the frequency e.g. 83.0M and the bandwith (-s) is set to 20k.

  Now the streamed audio is to fast. The audio sounds like pitched up and the terminal output of ffmpeg for speed is about 0.5x instead of 1x.

  How can i stream this frequency with a bandwith of 20k without getting a bad output ?

• Error creating folder based on file name in ffmpeg

  18 janvier 2023, par user21008368

  I've been trying to convert multiple videos into image stacks using ffmpeg. I would like to convert multiple videos at once, and export all the images from one video into a new folder, named after the video.

  


  I've found the following code from a previous question, but I can't get it to work on my computer (I'm using a mac).

  


  @echo off for %%i in (*.mp4) do (if not exist "%%~ni\" MD "%%~ni" ffmpeg -i "%%i" -vf fps=1/1800 "%%~ni\%%~ni_%%d.jpeg")

  


  I keep getting the error

  


  parse error near %%i`

  


  I think this is probably a syntax error, but I'm relatively new to using ffmpeg and working in the terminal.