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• How to concate videos which some have audio and some haven't audio in FFMPEG [duplicate]

  21 juin 2019, par Nikunj Paradva

  This question already has an answer here :

  • FFmpeg : concat multiple videos, some with audio, some without
    
    1 answer
    
  • FFmpeg concatenation, no Audio in Final Output
    
    1 answer
    

  What i am doing :->

  I am currently concat videos using FFMPEG. while selecting input videos I don’t know videos have audio stream or not. then i concate that videos with this command which is written below,

  I got this error because of one input have no sound stream

  What i have to do :->

  • how to check that input video have audio or not ?
  • how to concate this video inputs ?(one with audio another with no audio)
  • if possible all this thing in single command ?

  FFMPEG Command :-

   [-y,
  
     -i, /storage/emulated/0/Received/MP4_20190220_114210.mp4,
  
     -i, /storage/emulated/0/Received/VID-20190404-WA0010.mp4,
  
     -strict, experimental,
  
     -filter_complex, [0:v]scale=iw*min(854/iw\,480/ih):ih*min(854/iw\,480/ih), pad=854:480:(854-iw*min(854/iw\,480/ih))/2:(480-ih*min(854/iw\,480/ih))/2,setsar=1:1[v0];
  
                      [1:v]scale=iw*min(854/iw\,480/ih):ih*min(854/iw\,480/ih), pad=854:480:(854-iw*min(854/iw\,480/ih))/2:(480-ih*min(854/iw\,480/ih))/2,setsar=1:1[v1];
  
                      [v0][0:a][v1][1:a] concat=n=2:v=1:a=1,
  
     -preset, ultrafast,
  
     /storage/emulated/0/Video/Video_1561115811161.mp4]

  I got this Error While Executing.

  ffmpeg version n4.0-39-gda39990 Copyright (c) 2000-2018 the FFmpeg developers
  
        built with gcc 4.9.x (GCC) 20150123 (prerelease)
  
        configuration: --target-os=linux --cross-prefix=/root/bravobit/ffmpeg-android/toolchain-android/bin/arm-linux-androideabi- --arch=arm --cpu=cortex-a8 --enable-runtime-cpudetect --sysroot=/root/bravobit/ffmpeg-android/toolchain-android/sysroot --enable-pic --enable-libx264 --enable-ffprobe --enable-libopus --enable-libvorbis --enable-libfdk-aac --enable-libfreetype --enable-libfribidi --enable-libmp3lame --enable-fontconfig --enable-libvpx --enable-libass --enable-yasm --enable-pthreads --disable-debug --enable-version3 --enable-hardcoded-tables --disable-ffplay --disable-linux-perf --disable-doc --disable-shared --enable-static --enable-runtime-cpudetect --enable-nonfree --enable-network --enable-avresample --enable-avformat --enable-avcodec --enable-indev=lavfi --enable-hwaccels --enable-ffmpeg --enable-zlib --enable-gpl --enable-small --enable-nonfree --pkg-config=pkg-config --pkg-config-flags=--static --prefix=/root/bravobit/ffmpeg-android/build/armeabi-v7a --extra-cflags='-I/root/bravobit/ffmpeg-android/toolchain-android/include -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fno-strict-overflow -fstack-protector-all' --extra-ldflags='-L/root/bravobit/ffmpeg-android/toolchain-android/lib -Wl,-z,relro -Wl,-z,now -pie' --extra-cxxflags=
  
        libavutil      56. 14.100 / 56. 14.100
  
        libavcodec     58. 18.100 / 58. 18.100
  
        libavformat    58. 12.100 / 58. 12.100
  
        libavdevice    58.  3.100 / 58.  3.100
  
        libavfilter     7. 16.100 /  7. 16.100
  
        libavresample   4.  0.  0 /  4.  0.  0
  
        libswscale      5.  1.100 /  5.  1.100
  
        libswresample   3.  1.100 /  3.  1.100
  
        libpostproc    55.  1.100 / 55.  1.100
  
      Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Received/MP4_20190220_114210.mp4':
  
        Metadata:
  
          major_brand     : iso6
  
          minor_version   : 1
  
          compatible_brands: mp42iso6avc1isom
  
          creation_time   : 2019-02-20T06:12:15.000000Z
  
        Duration: 00:00:23.46, start: 0.000000, bitrate: 309 kb/s
  
          Stream #0:0(und): Video: h264 (avc1 / 0x31637661), yuv420p, 426x426, 243 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc (default)
  
          Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 32000 Hz, stereo, fltp, 64 kb/s (default)
  
      Input #1, mov,mp4,m4a,3gp,3g2,mj2, from '/storage/emulated/0/Received/VID-20190404-WA0010.mp4':
  
        Metadata:
  
          major_brand     : mp42
  
          minor_version   : 1
  
          compatible_brands: mp41mp42isom
  
          creation_time   : 2018-11-24T20:20:48.000000Z
  
        Duration: 00:00:59.51, start: 0.066667, bitrate: 649 kb/s
  
          Stream #1:0(und): Video: h264 (avc1 / 0x31637661), yuv420p(tv, bt709), 640x640, 646 kb/s, 29.98 fps, 30 tbr, 15360 tbn, 60 tbc (default)
  
          Metadata:
  
            creation_time   : 2018-11-24T20:20:48.000000Z
  
            handler_name    : Core Media Video
  
      Stream specifier ':a' in filtergraph description [0:v]scale=iw*min(854/iw\,480/ih):ih*min(854/iw\,480/ih), pad=854:480:(854-iw*min(854/iw\,480/ih))/2:(480-ih*min(854/iw\,480/ih))/2,setsar=1:1[v0];[1:v]scale=iw*min(854/iw\,480/ih):ih*min(854/iw\,480/ih), pad=854:480:(854-iw*min(854/iw\,480/ih))/2:(480-ih*min(854/iw\,480/ih))/2,setsar=1:1[v1];[v0][0:a][v1][1:a] concat=n=2:v=1:a=1 matches no streams.

  Your help would be appreciated.

• Bash script : Cycle script until ffmpeg command restarts successfully

  13 août 2023, par Bellacoda

  I have a IP Camera and the recordings are saved with ffmpeg RTSP into a raspberry pi.

  


  Sometimes, when the electricity shuts off and comes back on, the raspberry boots faster than the IP Camera and the ffmpeg command (saved on a crontab to run every reboot) fails to execute because it can't reach the IP Camera (that is still turning on).

  


  I tried to put a sleep command before the command but that doesn't work either.

  


  It also happened that when the IP Camera reboots, the raspberry closes the command, but when the camera comes back online, I have to manually lauch the command.

  


  Is there a way to make a script that waits to run the ffmpeg command until the camera is fully online (I assume with the $ ? variable for command exit status), and to wait to restart the ffmpeg command when the camera reboots ?

  


  The setup I have now is a crontab :
SHELL=/bin/bash
@reboot sleep 120s ; sudo ffmpeg ...

  


• I want to generate frames from a CCTV video using FFMPEG and save the frames as the time that they represent

  6 décembre 2014, par Jason Harris

  I am using mac os x terminal.

  So far I have mananaged the following code :

  ffmpeg -i cctvfootage.flv -f image2 -vf fps=fps=1 frames/frame_04d.png    

  The above code creates a frame for every second of the video, but names each frame as frame_0001.png, frame_0002.png, and so on. Although this is helpful, it is not the correct naming structure that I want.

  The date and time that the video footage starts from is 20th November 2014 at 13:46:12.

  The output name I want will be something like frames_20112014_134612.png (frames_DDMMYYYY_HHMMSS) for the first, frames_20112014_134613.png for the second, ect.

  This will then identify each frame as the day and time that the image is taken from.