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• FFMPEG creates an empty gif when the start time (-ss) of the video is over 9 seconds ?

  30 décembre 2020, par blablubla12

  I'm running this command in node.js

  


  function CreateGif() {
    return new Promise((resolve, reject) => {
      const ffmpeg = spawn(ffmpegPath, [
        '-ss',
        '00:00:10.000',
        '-i',
        target,
        '-i',
        overlayTarget,
        '-filter_complex',
        `[0:v]trim=duration=5,setpts=PTS-STARTPTS,scale=450:-1[trimmed];[trimmed]split[trimmed1][trimmed2];[trimmed2]reverse[rev];[trimmed1][rev]concat=n=2:v=1:a=0[v];[v][1:v]overlay=0:0:format=rgb[overlayed];[overlayed]split[a][b];[a]palettegen=stats_mode=diff[palette];[b][palette]paletteuse=bayer:bayer_scale=3.5[out]`,
        '-map',
        '[out]',
        '-y',
        tempPath
      ]);

      ffmpeg.stderr.setEncoding('utf8');
      ffmpeg.stderr.on('data', (data) => {
        console.log(data);
      });

      ffmpeg.on('close', function (code) {
        console.log('closed');
        resolve();
      });

      ffmpeg.on('error', function (err) {
        console.log(err);
        reject();
        throw new Error(err);
      });
    });
  }


  


  If the start time -ss is 00:00:09.000 or anything less than 10 seconds, then it creates the correct gif. However if I put 00:00:10.000 or anything above, it creates an empty gif (0 bytes). The same command works when I run it through cmd. FFMPEG version is ffmpeg version N-55112-g7eb9cf593e-static https://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2020

  


  Note : The video (defined as target in the code) is 1:30 min long and overlayTarget is a png image.

  


• Can't list input devices ffmpeg linux

  23 juillet 2021, par spindi598

  On windows I could do something like this to list input devices :

  


  ffmpeg -list_devices true -f dshow -i dummy


  


  On Linux I try doing something like this :

  


  ffmpeg -list_devices true -f <x11grab></x11grab>avfoundation>&#xA;

  


  And I get an error (I have also tried the latest git build from here) :

  


  ffmpeg version n4.2.4 Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 10.1.0 (GCC)
  configuration: --prefix=/usr --disable-debug --disable-static --disable-stripping --enable-avisynth --enable-fontconfig --enable-gmp --enable-gnutls --enable-gpl --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libdrm --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libiec61883 --enable-libjack --enable-libmfx --enable-libmodplug --enable-libmp3lame --enable-libopencore_amrnb --enable-libopencore_amrwb --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libv4l2 --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxcb --enable-libxml2 --enable-libxvid --enable-nvdec --enable-nvenc --enable-omx --enable-shared --enable-version3
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Unrecognized option 'list_devices'.
Error splitting the argument list: Option not found


  


  How can I list my input devices ?

  


• FFmpeg installation on Raspberry Pi Zero W : Undefined references to __atomic

  3 février 2021, par MisterGray

  I'm trying to install ffmpeg on my Raspberry Pi Zero W, but I get several error messages.

  


  OS : Raspberry Pi OS (32-bit) Lite (May 2020)

  


  I have executed the following commands :

  


  sudo apt update
sudo apt full-upgrade
sudo apt install git
git clone https://github.com/FFmpeg/FFmpeg.git
cd FFmpeg
./configure --arch=armel --target-os=linux --enable-gpl --enable-omx --enable-omx-rpi --enable-nonfree
make -j2
sudo make install


  


  Output of last command :

  


  ...
LD      ffmpeg_g
/usr/bin/ld: libavformat/libavformat.a(fifo.o): in function `fifo_init':
/home/pi/FFmpeg/libavformat/fifo.c:519: undefined reference to `__atomic_store_8'
/usr/bin/ld: libavformat/libavformat.a(fifo.o): in function `fifo_write_trailer':
/home/pi/FFmpeg/libavformat/fifo.c:624: undefined reference to `__atomic_fetch_add_8'
/usr/bin/ld: /home/pi/FFmpeg/libavformat/fifo.c:631: undefined reference to `__atomic_store_8'
/usr/bin/ld: libavformat/libavformat.a(fifo.o): in function `fifo_thread_write_packet':
/home/pi/FFmpeg/libavformat/fifo.c:188: undefined reference to `__atomic_fetch_sub_8'
/usr/bin/ld: libavformat/libavformat.a(fifo.o): in function `fifo_consumer_thread':
/home/pi/FFmpeg/libavformat/fifo.c:457: undefined reference to `__atomic_load_8'
/usr/bin/ld: libavformat/libavformat.a(fifo.o): in function `fifo_write_packet':
/home/pi/FFmpeg/libavformat/fifo.c:597: undefined reference to `__atomic_fetch_add_8'
collect2: error: ld returned 1 exit status
make: *** [Makefile:114: ffmpeg_g] Error 1


  


  Maybe another package is missing ? Do I have to change anything in the config ?