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• Extend + scale a portrait video so the aspect ratio stays and the black borders become a blurry version of the video

  24 avril 2017, par P. Dee

  I have a 720 x 1280 pixels video. How do I extend and scale it to 1920 x 1080 such that the aspect ratio is being kept and the black borders are a blurry version of the video, so you don’t really notice that it’s just a small vertical stripe.

  Example

  

  

  I started with

  ffmpeg -i video720x1280.mp4 -vf "scale=608:1080,pad=width=1920:height=1080:x=656:y=0:color=black" video1920x1080.mp4

• Add a fixed size image on a video, regardless of the video width & height FFMPEG [duplicate]

  30 juillet 2017, par Rita

  This question already has an answer here :

  • FFMPEG : Add a fixed size image on a video, regardless of the video width & height (resolution)
    
    1 answer
    

  This is my code that that is use is following

  $info = pathinfo($file) ;
  $out = "$info[’dirname’]/ss_$info[’basename’]" ;
  exec("ffmpeg -i ’".$file."’ -i ’".SS_ROOT."".$ss->settings[’watermark_image’]."’ -filter_complex ’overlay=main_w-overlay_w-10:main_h-overlay_h-10’ ’".$out."’") ; 

  that works very well, but it doesn’t keep the logo aspect ratio. I tried this code on two videos with different resolution and this is the result

• FFmpeg Dropping Aspect Ratio on FLV Output

  16 septembre 2017, par Mike B

  I am having an issue with FFmpeg dropping the aspect ratio when converting a 1920x1080 stream to a lower resolution (please see below for more information). The objective is to take the output from TVHeadend and convert it to a FLV format that I can stream outside of my house.

  ffmpeg -c:v mpeg2_mmal -i http://192.168.1.142:9981/stream/channelnumber/10.1?profile=pass -c:a libfdk_aac -profile:a aac_he_v2 -b:a 32k -ac 2 -async 48000 -c:v h264_omx -b:v 1800k -sws_flags fast_bilinear -vf scale=720:540 -keyint_min 0 -g 100 -f flv rtmp://192.168.1.110:1935/live/test

  This produces the following onscreen output :

  Output #0, flv, to 'rtmp://192.168.1.110:1935/live/test':
  
    Metadata:
  
      encoder         : Lavf57.82.100
  
      Stream #0:0: Video: h264 (h264_omx) ([7][0][0][0] / 0x0007), yuv420p, 720x540 [SAR 4:3 DAR 16:9], q=2-31, 1800 kb/s, 29.97 fps, 1k tbn, 29.97 tbc
  
      Metadata:
  
        encoder         : Lavc57.105.100 h264_omx
  
      Stream #0:1(eng): Audio: aac (libfdk_aac) (HE-AACv2) ([10][0][0][0] / 0x000A), 48000 Hz, stereo, s16, 32 kb/s
  
      Metadata:
  
        encoder         : Lavc57.105.100 libfdk_aac

  Based on the onscreen output, it appears that that SAR and DAR are correct. It is only when you examine the actual files that the aspect ratio has been dropped.

  Input #0, hls,applehttp, from 'http://192.168.1.110:8080/live/test/index.m3u8':
  
    Duration: N/A, start: 109.116000, bitrate: N/A
  
    Program 0 
  
      Metadata:
  
        variant_bitrate : 0
  
      Stream #0:0: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 720x540, 29.97 tbr, 90k tbn, 180k tbc
  
      Metadata:
  
        variant_bitrate : 0
  
      Stream #0:1: Audio: aac (HE-AACv2) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp
  
      Metadata:
  
        variant_bitrate : 0

  I modified the command to instead save to a local MP4 file :

  ffmpeg -c:v mpeg2_mmal -i http://192.168.1.142:9981/stream/channelnumber/10.1?profile=pass -c:a libfdk_aac -profile:a aac_he_v2 -b:a 32k -ac 2 -async 48000 -c:v h264_omx -b:v 1800k -sws_flags fast_bilinear -vf scale=720:540 -keyint_min 0 -g 100 ~/test.mp4

  And the issue is resolved. I have also tried adding the video filters setsar and setdar to no avail.

  I am performing this on a Raspberry Pi 3, which lacks the ability to de-interlace in hardware. To remedy this, I am simply scaling the video vertically by 1/2. I have tried scaling the output to 960x540 but the Pi has issues keeping up.