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• lower fps when using ffmpeg to convert mp4 to gif

  3 juin 2016, par Muhia NJoroge

  I am using ffmpeg to convert high quality videos to gif, most of the videos are 60fps and over 720p, but when I use the code below, to convert the video to gif, I get very low fps for the gif output,

  #!/usr/bin/env
  
  palette=/tmp/pallete.png
  
  filter="fps=50,scale=480:-1:flags=lanczos"
  
  
  
  ffmpeg -y  -i test.mov -vf $filter,palettegen=stats_mode=diff $palette
  
  ffmpeg -y -i test.mov -i $palette -lavfi "$filter [x]; [x][1:v] paletteuse" test.gif

  another issue I have noted is - as the width increases e.g 720 instead of 480 I get even lower fps.

  here is output log example, the output fps is lower than the assigned 50fps

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/tmp/201631203815.mp4':
  
  Metadata:
  
   major_brand     : isom
  
   minor_version   : 512
  
   compatible_brands: isomiso2avc1mp41
  
   encoder         : Lavf56.36.100
  
  Duration: 00:00:05.48, start: 0.016000, bitrate: 1579 kb/s
  
  
  
  Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1334x1334, 1576 kb/s, 60.18 fps, 60 tbr, 1000k tbn, 50 tbc (default)
  
  Metadata:
  
    handler_name    : VideoHandler
  
  
  
  Input #1, png_pipe, from '/tmp/pallete.png':
  
     Duration: N/A, bitrate: N/A
  
  Stream #1:0: Video: png, rgba(pc), 16x16 [SAR 1:1 DAR 1:1], 25 tbr, 25 tbn, 25 tbc
  
  
  
  Output #0, gif, to '/tmp/201631203815.gif':
  
  Metadata:
  
    major_brand     : isom
  
    minor_version   : 512
  
    compatible_brands: isomiso2avc1mp41
  
    encoder         : Lavf56.40.101
  
  Stream #0:0: Video: gif, pal8, 480x480, q=2-31, 200 kb/s, 50 fps, 100 tbn, 50 tbc (default)
  
  Metadata:
  
    encoder         : Lavc56.60.100 gif
  
  Stream mapping:
  
     Stream #0:0 (h264) -> fps
  
     Stream #1:0 (png) -> paletteuse:palette
  
    paletteuse -> Stream #0:0 (gif)
  
  Press [q] to stop, [?] for help
  
  
  
  frame=  275 fps= 32 q=-0.0 Lsize=    2480kB time=00:00:05.50 bitrate=3693.5kbits/s    

  How do I ensure that the output fps is always whats set by the user ?
  Any resource on this is highly appreciated.

  UPDATE

  i have also noticed that the use of a higher fps eg filter="fps=90,scale=480:-1:flags=lanczos" has the effect of slowing down the gif,like a slow motion effect, the output fps is still lower around 15fps,

• How can I stream a jpeg file that is continually created to a mjpeg stream that can be read as a webcam from Raspbery Pi ? [closed]

  10 novembre 2023, par Andrei Ignat

  I am using OpenCV to process frames I catch from a MJPEG stream, aprox. 1-3fps for a burst of 30-60s and want to stream the result back to view it side by side as a webcam in the webinterface.
The Webinterface reading the stream is Mainsail and the OpenCV file is created by a Python script in Klipper.

  


  I tried saving the frame to "frame.jpeg" and stream using FFMPEG :

  


   ffmpeg -loop 1 -i frame.jpg -framerate 15 -c:v mjpeg -f mjpeg -listen 1 http://*:8282/cv2


  


  But it gives me this error when the webcam client connects :

  


  Input #0, image2, from 'frame.jpg':
  Duration: 00:00:00.04, start: 0.000000, bitrate: 10017 kb/s
  Stream #0:0: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 640x480 [SAR 1:1 DAR 4:3], 25 fps, 25 tbr, 25 tbn
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg (native) -> mjpeg (native))
Press [q] to stop, [?] for help
Output #0, mjpeg, to 'http://*:8282/cv2':
  Metadata:
    encoder         : Lavf59.27.100
  Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown, progressive), 640x480 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 25 fps, 25 tbn
    Metadata:
      encoder         : Lavc59.37.100 mjpeg
    Side data:
      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: N/A
av_interleaved_write_frame(): Broken pipe time=00:00:00.04 bitrate=3496.4kbits/s speed=2e+04x
Error writing trailer of http://*:8282/cv2: Broken pipe
frame=    2 fps=0.0 q=2.7 Lsize=      17kB time=00:00:00.08 bitrate=1748.2kbits/s speed=1.27x
video:43kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
[http @ 0x29fd660] URL read error: End of file
Error closing file http://*:8282/cv2: End of file
Conversion failed!


  


• FFMPEG detect silence command runs correctly but does not give the silence duration

  8 janvier 2020, par Aizayousaf

  I have a .wav audio file and I need to extract silence/pause duration in this file. I’m using ffmpeg with silence detect filter but I’m unable to understand why its not giving silence duration with this file while it gives result with other files. Can anyone help me to understand the out given below that why its not showing detected silences.

  Input Command :

  ffmpeg -i "input.wav" -af silencedetect=noise=-30dB:d=0.5 -f null -

  OutPut

  ffmpeg version 4.2.1 Copyright (c) 2000-2019 the FFmpeg developers
  
  built with gcc 9.1.1 (GCC) 20190807
  
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --    enable-iconv --enable-libass --enable-libdav1d --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-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --    enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  
  
  
  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
  
  
  
  Guessed Channel Layout for Input Stream #0.0 : stereo
  
  Input #0, wav, from 'D:\Research\PhD\Carolina\AD\wav\media.io_Wakeman_Rhyne_001_01.wav':
  
  Duration: 00:17:38.04, bitrate: 1411 kb/s
  
  Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
  
  Stream mapping:
  
  Stream #0:0 -> #0:0 (pcm_s16le (native) -> pcm_s16le (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, null, to 'pipe:':