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• FFmpeg creates empty palette, for better quality GIF conversion

  16 mars 2018, par 1234567

  FFmpeg creates empty palette, for better quality GIF conversion

  I have referred to

  https://ffmpeg.org/ffmpeg-filters.html#palettegen-1

  https://superuser.com/a/556031/724432

  but it creates an empty pallete file

  I am trying it on android

  the command used is

  {"-y", "-i", j, "-ss", 10, "-t",3,"-vf","fps=15,scale=300:-1:flags=lanczos,palettegen", palette};

  and the error that is shown is

  ffmpeg version n3.0.1 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.8 (GCC)
  
    configuration: --target-os=linux --cross-prefix=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-libass --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-pthreads --disable-debug --disable-ffserver --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-ffprobe --enable-gpl --enable-yasm --disable-doc --disable-shared --enable-static --pkg-config=/home/vagrant/SourceCode/ffmpeg-android/ffmpeg-pkg-config --prefix=/home/vagrant/SourceCode/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/home/vagrant/SourceCode/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-libs='-lpng -lexpat -lm' --extra-cxxflags=
  
    libavutil      55. 17.103 / 55. 17.103
  
    libavcodec     57. 24.102 / 57. 24.102
  
    libavformat    57. 25.100 / 57. 25.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 31.100 /  6. 31.100
  
    libswscale      4.  0.100 /  4.  0.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/sdcard0/try/Videos/2018-03-13-15-47-29.mp4.mp4':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      creation_time   : 2018-03-13 15:47:33
  
    Duration: 00:00:03.39, start: 0.000000, bitrate: 615 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 960x540, 637 kb/s, SAR 1:1 DAR 16:9, 22.95 fps, 60 tbr, 90k tbn, 180k tbc (default)
  
      Metadata:
  
        creation_time   : 2018-03-13 15:47:33
  
        handler_name    : VideoHandle
  
      Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 16000 Hz, mono, fltp, 12 kb/s (default)
  
      Metadata:
  
        creation_time   : 2018-03-13 15:47:33
  
        handler_name    : SoundHandle
  
  Output #0, image2, to '/storage/sdcard0/try/Gifs//2018-03-16-11-36-48.png':
  
    Metadata:
  
      major_brand     : mp42
  
      minor_version   : 0
  
      compatible_brands: isommp42
  
      encoder         : Lavf57.25.100
  
      Stream #0:0(eng): Video: png, rgba, 16x16 [SAR 1:1 DAR 1:1], q=2-31, 200 kb/s, 10 fps, 10 tbn, 10 tbc (default)
  
      Metadata:
  
        creation_time   : 2018-03-13 15:47:33
  
        handler_name    : VideoHandle
  
        encoder         : Lavc57.24.102 png
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> png (native))
  
  Press [q] to stop, [?] for help
  
  frame=    0 fps=0.0 q=0.0 size=N/A time=00:00:00.00 bitrate=N/A speed=   0x    
  
  frame=    0 fps=0.0 q=0.0 size=N/A time=00:00:00.00 bitrate=N/A speed=   0x    
  
  [Parsed_palettegen_2 @ 0xac96ed80] 255(+1) colors generated out of 3594 colors; ratio=0.070952
  
  [Parsed_palettegen_2 @ 0xac96ed80] Dupped color: FF5F5F5F
  
  frame=    0 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.00 bitrate=N/A speed=   0x    
  
  video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)

  any help would be useful

• FFMPEG can't find audio device for webcam on one computer

  13 mars 2018, par David

  I am building a webcam recording app. I am using FFMPEG to capture the audio and video. I have a Logitech C930 webcam.

  >ffmpeg -list_devices true -f dshow -i dummy
  ffmpeg version N-90155-g28924f4b48 Copyright (c) 2000-2018 the FFmpeg developers
    built with gcc 7.3.0 (GCC)
    configuration : —enable-gpl —enable-version3 —enable-sdl2 —enable-bzlib —enable-fontconfig —enable-gnutls —enable-iconv —enable-libass —enable-libbluray —enable-libfreetype —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenjpeg —enable-libopus —enable-libshine —enable-libsnappy —enable-libsoxr —enable-libtheora —enable-libtwolame —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxml2 —enable-libzimg —enable-lzma —enable-zlib —enable-gmp —enable-libvidstab —enable-libvorbis —enable-libvo-amrwbenc —enable-libmysofa —enable-libspeex —enable-libxvid —enable-libmfx —enable-amf —enable-cuda —enable-cuvid —enable-d3d11va —enable-nvenc —enable-dxva2 —enable-avisynth
    libavutil      56.  7.101 / 56.  7.101
    libavcodec     58. 12.102 / 58. 12.102
    libavformat    58.  9.100 / 58.  9.100
    libavdevice    58.  2.100 / 58.  2.100
    libavfilter     7. 12.100 /  7. 12.100
    libswscale      5.  0.101 /  5.  0.101
    libswresample   3.  0.101 /  3.  0.101
    libpostproc    55.  0.100 / 55.  0.100
  [dshow @ 0000024786c38680] DirectShow video devices (some may be both video and audio devices)
  [dshow @ 0000024786c38680]  "Microsoft Camera Front"
  [dshow @ 0000024786c38680]     Alternative name "@device_pnp_~?\display#int3470#4&1835d135&0&uid13424#65e8773d-8f56-11d0-a3b9-00a0c9223196bf89b5a5-61f7-4127-a279-e187013d7caf"
  [dshow @ 0000024786c38680]  "Microsoft Camera Rear"
  [dshow @ 0000024786c38680]     Alternative name "@device_pnp_~?\display#int3470#4&1835d135&0&uid13424#65e8773d-8f56-11d0-a3b9-00a0c92231967c9bbcea-909c-47b3-8cf9-2aa8237e1d4b"
  [dshow @ 0000024786c38680]  "Logitech Webcam C930e"
  [dshow @ 0000024786c38680]     Alternative name "@device_pnp_~?\usb#vid_046d&pid_0843&mi_00#8&dd2d9e1&0&0000#65e8773d-8f56-11d0-a3b9-00a0c9223196\global"
  [dshow @ 0000024786c38680]  "ChromaCam"
  [dshow @ 0000024786c38680]     Alternative name "@device_sw_860BB310-5D01-11D0-BD3B-00A0C911CE863403512D-FE5D-4D68-B053-E86D662E4D58"
  [dshow @ 0000024786c38680] DirectShow audio devices
  [dshow @ 0000024786c38680]  "Microphone (2- Logitech Webcam C930e)"
  [dshow @ 0000024786c38680]     Alternative name "@device_cm_33D9A762-90C8-11D0-BD43-00A0C911CE86\wave_1AF7CBFB-477F-44D9-B8C4-E178F036B5D1"
  dummy : Immediate exit requested

  Notice the "Microphone (2- Logitech Webcam C930e)" audio device. I can capture from it using FFMPEG.

  Now, I move the same camera to a different computer (Intel Compute Stick) running nearly the same build of windows (16299.251 on the stick, 16299.248 on the laptop). Stick is 32-bit home and laptop is 64-bit Pro (shouldn’t matter, should it ?).
  I run the same command with the exact same camera and same drivers installed :

  >ffmpeg -list_devices true -f dshow -i dummy
  ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
    built with gcc 7.3.0 (GCC)
    configuration : —enable-gpl —enable-version3 —enable-sdl2 —enable-bzlib —enable-fontconfig —enable-gnutls —enable-iconv —enable-libass —enable-libbluray —enable-libfreetype —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenjpeg —enable-libopus —enable-libshine —enable-libsnappy —enable-libsoxr —enable-libtheora —enable-libtwolame —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxml2 —enable-libzimg —enable-lzma —enable-zlib —enable-gmp —enable-libvidstab —enable-libvorbis —enable-libvo-amrwbenc —enable-libmysofa —enable-libspeex —enable-libxvid —enable-libmfx —enable-cuda —enable-cuvid —enable-d3d11va —enable-nvenc —enable-dxva2 —enable-avisynth
    libavutil      55. 78.100 / 55. 78.100
    libavcodec     57.107.100 / 57.107.100
    libavformat    57. 83.100 / 57. 83.100
    libavdevice    57. 10.100 / 57. 10.100
    libavfilter     6.107.100 /  6.107.100
    libswscale      4.  8.100 /  4.  8.100
    libswresample   2.  9.100 /  2.  9.100
    libpostproc    54.  7.100 / 54.  7.100
  [dshow @ 00797be0] DirectShow video devices (some may be both video and audio devices)
  [dshow @ 00797be0]  "Logitech Webcam C930e"
  [dshow @ 00797be0]     Alternative name "@device_pnp_~?\usb#vid_046d&pid_0843&mi_00#6&dd2d9e1&0&0000#65e8773d-8f56-11d0-a3b9-00a0c9223196\global"
  [dshow @ 00797be0] DirectShow audio devices
  [dshow @ 00797be0] Could not enumerate audio only devices (or none found).
  dummy : Immediate exit requested
  

  No Audio device listed ? What ? If I use python’s sounddevice module, it sees the audio device :

  > python -m sounddevice
  0 Microsoft Sound Mapper - Output, MME (0 in, 2 out)
   1 Remote Audio, MME (0 in, 2 out)
    2 Primary Sound Driver, Windows DirectSound (0 in, 2 out)
    3 Remote Audio, Windows DirectSound (0 in, 2 out)
    4 Remote Audio, Windows WASAPI (0 in, 2 out)
    5 Microphone (Logitech Webcam C930e), Windows WDM-KS (2 in, 0 out)
  

  I can capture from that audio device with sounddevice, but I can’t get FFMPEG to capture from it.

  >ffmpeg -report -rtbufsize 50000k-f dshow -i video="Logitech Webcam C930e":audio="Microphone (Logitech Webcam C930e)" -t 120 -y -s 1920x1080 -q 2 -video_pin_name 1 -audio_pin_name 5 -filter:v setpts=1*PTS Watchmen_20180312095119_c.avi
  ffmpeg started on 2018-03-12 at 17:07:08
  Report written to "ffmpeg-20180312-170708.log"
  ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
    built with gcc 7.3.0 (GCC)
    configuration : —enable-gpl —enable-version3 —enable-sdl2 —enable-bzlib —enable-fontconfig —enable-gnutls —enable-iconv —enable-libass —enable-libbluray —enable-libfreetype —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenjpeg —enable-libopus —enable-libshine —enable-libsnappy —enable-libsoxr —enable-libtheora —enable-libtwolame —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxml2 —enable-libzimg —enable-lzma —enable-zlib —enable-gmp —enable-libvidstab —enable-libvorbis —enable-libvo-amrwbenc —enable-libmysofa —enable-libspeex —enable-libxvid —enable-libmfx —enable-cuda —enable-cuvid —enable-d3d11va —enable-nvenc —enable-dxva2 —enable-avisynth
    libavutil      55. 78.100 / 55. 78.100
    libavcodec     57.107.100 / 57.107.100
    libavformat    57. 83.100 / 57. 83.100
    libavdevice    57. 10.100 / 57. 10.100
    libavfilter     6.107.100 /  6.107.100
    libswscale      4.  8.100 /  4.  8.100
    libswresample   2.  9.100 /  2.  9.100
    libpostproc    54.  7.100 / 54.  7.100
  video=Logitech Webcam C930e:audio=Microphone (Logitech Webcam C930e) : No such file or directory
  

  I have been trying to debug by removing and reinstalling drivers, etc, but to no avail. I also grabbed a Microsoft Lifecam webcam and got similar results. I can see the lifecam’s audio on the laptop but not the stick in just the same manner as the logitech camera.
  How can I get the audio device to show up on the stick so I can capture from it ?

• Create a video with timestamp from multiple images with "picture taken date/time" in the meta data with ffmpeg or similar ?

  16 mars 2018, par m4D_guY

  I have two time lapse videos with a rate of 1 fps. The camera took 1 Image every minute. Unfortunately it was missed to set the camera to burn/print on every image the time and date. I am trying to burn the time and date afterwards into the video.

  I decoded with ffmpeg the two .avi files into  7000 single images each and wrote a R script that renamed the files into their "creation" date (the time and date the pictures where taken). Then i used exiftoolto write those information "into" the file, into their exif data or meta data or whatever this is called.

  The final images in the folder are looking like this :

  2018-03-12 17_36_40.png

  2018-03-12 17_35_40.png

  2018-03-12 17_34_40.png

  ...

  Is it possible to create a Video from these images again with ffmpeg or similiar with a "timestamp" in the video so you can see while watching a time and date stamp in the video ?