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• ffmpeg scaling not working for video

  15 mai 2018, par Neer Patel

  I am trying to change the dimensions of the video file through FFMPEG.
  I want to convert any video file to 480*360 .

  This is the command that I am using...

  ffmpeg -i oldVideo.mp4 -vf scale=480:360 newVideo.mp4

  After this command 1280*720 dimensions are converted to 640*360.

  I have also attached video. it will take less than minute for any experts out there. Is there anything wrong ?

  You can see here. (in Video, after 20 seconds, direclty jump to 1:35 , rest is just processing time).

  UPDATE :

  I found the command from this tutorial

• How to apply noises on video ?

  22 juin 2018, par cht_usr

  I have seen this video on youtube which apply ffmpeg noises
  by these commands, but when I tried to apply them on my video it does not work

      ffmpeg -f lavfi -i mandelbrot=s=320x240 -c:v ffv1 -g 1 -bsf noise -t 10 ffv11v1.mov
  
      ffmpeg -f lavfi -i mandelbrot=s=320x240 -c:v ffv1 -level 3 -g 1 -bsf noise -t 10 ffv1v3.mov
  
      ffmpeg -f lavfi -i mandelbrot=s=320x240 -c:v v210 -bsf noise -t 10 -pix_fmt yuv422p10le v210.mov
  
      ffmpeg -f lavfi -i mandelbrot=s=320x240 -c:v rawvideo -bsf noise -t 10 -pix_fmt uyvy422 -vtag 2vuy uyvy422.mov
  
      ffmpeg -f lavfi -i mandelbrot=s=320x240 -c:v libx264 -crf 0 -qp 0 -bsf noise -t 10 -pix_fmt yuv420p h264.mov
  
      ffmpeg -f lavfi -i mandelbrot=s=320x240 -c:v qtrle -bsf noise -t 10 qtrle.mov
  
      ffmpeg -f lavfi -i mandelbrot=s=320x240 -c:v sunrast -bsf noise -t 10 sunrast.avi
  
      ffmpeg -f lavfi -i mandelbrot=s=320x240 -c:v targa -bsf noise -t 10 targa.avi
  
      ffmpeg -f lavfi -i mandelbrot=s=320x240 -c:v utvideo -bsf noise -t 10 utvideo.mov
  
      ffmpeg -f lavfi -i mandelbrot=s=320x240 -c:v xwd -bsf noise -t 10 xwd.avi
  
      ffmpeg -f lavfi -i mandelbrot=s=320x240 -c:v zmbv -bsf noise -t 10 zmbv.avi
  
      ffmpeg -f lavfi -i mandelbrot=s=320x240 -c:v flashsv -bsf noise -t 10 flashsv.mov
  
      ffmpeg -f lavfi -i mandelbrot=s=320x240 -c:v huffyuv -bsf noise -t 10 -pix_fmt yuv420p huffyuv.mov
  
      ffmpeg -f lavfi -i mandelbrot=s=320x240 -c:v libx264 -crf 0 -qp 0 -bsf noise -t 10 -pix_fmt yuv420p h264.mov

  like this command :

  ffmpeg -i /home/user/video.mp4 -codec:v huffyuv -f lavfi -c:v sunrast -bsf noise -t 10 videoNoised.avi

• Automatic encoder selection failed for output stream #0:1

  9 juin 2018, par Rafael Lima

  I’m trying to use ffmpeg for edit some videos on android...
  It is working fine but if I try to use drawtext i get error

  the command is :

  path/ffmpeg -y -i /path/asd.mp4 -map 0 -segment_time 15 -f segment -c:v libx264 -preset veryfast -crf 30 -vf "drawtext=text='test message ':fontfile=/path/arial.ttf:box=1:boxborderw=30:boxcolor=0xE86F67@0.7:fix_bounds=true:fontcolor=0x2A363B:fontsize=32:x=0:y=h" -r 30 -force_key_frames expr:gte(t,n_forced*15) -an /path/temp%03d.mp4

  and the error is :

   ffmpeg version 4.0 Copyright (c) 2000-2018 the FFmpeg developers
  
    built with Android (4691093 based on r316199) clang version 6.0.2 (https://android.googlesource.com/toolchain/clang 183abd29fc496f55536e7d904e0abae47888fc7f) (https://android.googlesource.com/toolchain/llvm 34361f192e41ed6e4e8f9aca80a4ea7e9856f327) (based on LLVM 6.0.2svn)
  
   configuration: --prefix=/home/rafa/Desktop/m4/build --target-os=linux --arch=i686 --cpu=i686 --cross-prefix=/home/rafa/Desktop/m4/ndk/toolchain/i686/bin/i686-linux-android- --enable-cross-compile --cc=/home/rafa/Desktop/m4/ndk/toolchain/i686/bin/clang --cxx=/home/rafa/Desktop/m4/ndk/toolchain/i686/bin/clang++ --sysroot=/home/rafa/Desktop/m4/ndk/toolchain/i686/sysroot --pkg-config=/usr/bin/pkg-config --pkg-config-flags=--static --enable-pic --enable-gpl --enable-nonfree --enable-static --disable-shared --enable-ffmpeg --disable-ffplay --disable-ffprobe --disable-doc --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libx264 --enable-libfdk-aac --enable-bsf=aac_adtstoasc --enable-librtmp --enable-zlib --enable-libfreetype --enable-openssl --enable-libfontconfig --disable-asm --disable-devices --extra-cflags=-mno-stackrealign
  
    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
  
      libswscale      5.  1.100 /  5.  1.100
  
       libswresample   3.  1.100 /  3.  1.100
  
       libpostproc    55.  1.100 / 55.  1.100
  
  
  
  
  
  
  
     major_brand     : isom
  
       minor_version   : 512
  
       compatible_brands: isomiso2avc1mp41
  
       title           : 20180226 174005
  
       artist          : Rafael Lima
  
       date            : 2018
  
       encoder         : Lavf55.49.100
  
       comment         : https://www.youtube.com/watch?v=bkzc9mLyCyo
  
     Duration: 00:03:26.94, start: 0.000000, bitrate: 4156 kb/s
  
       Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 4025 kb/s, 30 fps, 30 tbr, 90k tbn, 60 tbc (default)
  
       Metadata:
  
         handler_name    : VideoHandler
  
       Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 125 kb/s (default)
  
       Metadata:
  
         handler_name    : SoundHandler
  
   Automatic encoder selection failed for output stream #0:1. Default encoder for format segment (codec none) is probably disabled. Please choose an encoder manually.
  
   Error selecting an encoder for stream 0:1

  things to considere :
  1. I’ve checked 3 times all the paths are valid
  2. I’ve tested the same command on ffmpeg 4.0 on windows and it works [with the same video]
  3. If I remove the drawtext filter it works fine...

  I tought it ffmpeg was built without drawtext or with some error so i spent 10 days in order to build it bymyself and guarantee every dependency is ok... but at end i got the same error

  does anyone have any idea please

  ==============================
  UPDATE

  I keep testing and if I remove the quotes from the filter and use a text without spacing it works

  ex :
  drawtext=text='test_message':fontfile=/path/arial.ttf:box=1:boxborderw=30:boxcolor=0xE86F67@0.7:fix_bounds=true:fontcolor=0x2A363B:fontsize=32:x=0:y=h

  so I believe there is something related to how android is escapes quotes and simple quotes because i compiled ffmpeg with same parameters and it runs on ubuntu with spaces at the text (just need to use simple quotes)

  does anyone know about it ?