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• Mingw-w64 builded FFmpeg doesn't show any usage information

  26 octobre 2013, par user1240328

  First I wanted to modificate ffplay according to my requirments. Then I noticed that original ffplay from my build can't play some video files, but it didn't write any message to console. Then I noticed that ffmpeg also don't write any usage message when I run it without params. But it works. If I run it from terminal it's like running asynchronously ! The terminal just shows next row. I mean it asks for a next command. But the ffmpeg process is visible in task manager and it writes the output video file what I had requested !

  I created following souce file. I have modified the Makefile. So it have built the exe-file works just the same way. I have no idea how it can be.

  #include 
  
  #include "cmdutils.h"
  
  
  
  const char program_name[] = "hello";
  
  const int program_birth_year = 2013;
  
  
  
  void show_help_default(const char *opt, const char *arg)
  
  {
  
      printf("zxcvbnm\n");
  
  }
  
  
  
  int main(int argc, char **argv)
  
  {
  
      printf("1234567890\n");
  
      return 0;
  
  }

  I want to prevent this behavior.

  I want to make printf working in traditional manner.

  How I build FFmpeg :

  PKG_CONFIG_PATH=/home/developer/workspace/MinGW32fs/lib/pkgconfig/ \
  
  SDL_CONFIG=/home/developer/workspace/MinGW32fs/bin/sdl-config \
  
  ./configure \
  
    --prefix=/home/developer/workspace/MinGW32fs \
  
    --extra-ldflags="-L/home/developer/workspace/MinGW32fs/lib" \
  
    --extra-cflags="-I/home/developer/workspace/MinGW32fs/include" \
  
    --arch=x86 --target-os=mingw32 --cross-prefix=i686-w64-mingw32-  \
  
    --pkg-config=pkg-config   --enable-libtheora --enable-libvorbis --enable-libvpx \
  
    --enable-outdev=sdl --enable-shared --disable-static \
  
    --disable-doc --disable-manpages --disable-podpages
  
  
  
  make

• Extract audio with ffmpeg, linux

  13 mai 2019, par Puffin

  I’m trying to extract audio tracks from some Avi videos and save them to their own files, ideally without re-encoding.

  I’ve had a look through here https://www.ffmpeg.org/ffmpeg.html#Audio-Options and here ffmpeg to extract audio from video though I’m getting errors regardless of the approach I try.

  My latest command string is :

  ffmpeg -i /home/d/Pictures/Test/input-video.AVI -map 0:a -vn -acodec copy /home/d/Pictures/Test/output-audio.m4a

  The key part of the output is :

  Guessed Channel Layout for  Input Stream #0.1 : mono
  
  Input #0, avi, from '/home/d/Pictures/Test/input-video.AVI':
  
    Duration: 00:00:05.94, start: 0.000000, bitrate: 18131 kb/s
  
      Stream #0:0: Video: mjpeg (MJPG / 0x47504A4D), yuvj422p(pc, bt470bg/unknown/unknown), 1280x720, 17995 kb/s, 30.28 fps, 30.28 tbr, 30.28 tbn, 30.28 tbc
  
      Stream #0:1: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 11025 Hz, 1 channels, s16, 176 kb/s
  
  File '/home/d/Pictures/Test/output-audio.m4a' already exists. Overwrite ? [y/N] y
  
  [ipod @ 0x1d89520] Codec for stream 0 does not use global headers but container format requires global headers
  
  [ipod @ 0x1d89520] Could not find tag for codec pcm_s16le in stream #0, codec not currently supported in container
  
  Output #0, ipod, to '/home/d/Pictures/Test/output-audio.m4a':
  
    Metadata:
  
      encoder         : Lavf56.40.101
  
      Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 11025 Hz, mono, 176 kb/s
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (copy)
  
  Could not write header for output file #0 (incorrect codec parameters ?): Invalid argument

  I’m believe I have got the right audio stream number from this output and thus am assuming the "-map 0:a" part isn’t the problem.

  I’m running on Linux Mint 18.1

• add video stream to video file using FFmpeg

  9 septembre 2013, par petre

  I am recording avi stream from webcam by using code below :

  ffmpeg -f video4linux2 -i /dev/video0 -c:v libx264 -r 5 -s 320x240 -vf format=gray -y /home/aydu/Desktop/SEC_REC/ffmpeg/cam0.avi -r 0.5 -vf format=gray -f image2 -updatefirst 1 /home/aydu/Desktop/SEC_REC/ffmpeg/image.jpeg

  What i want is to add new stream if cam0.avi exists. Now, my code is overwriting cam0.avi.