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• Maintain aspect ratio with ffmpeg for television format

  9 avril 2020, par Elmo

  I'm trying to capture screen images into a pipe in ffmpeg and create a video.
This is how it works :

  



  -f lavfi -i anullsrc=r=48000:cl=stereo -f image2pipe -r 25 -i pipe: -target pal-dv25 -vcodec dvvideo -vf yadif=1:-1:0,interlace=bff,setdar=1.85:1 -flags +ildct+ilme -c:a pcm_s16le -maxrate 5000k -r 25 -f mov -shortest -map 0:a -map 1:v -y out.mov


  



  The problem is that the images have a 16:9 resolution and I get 16:9 in original_aspect_ratio line in Mediainfo with dar=1.85:1 but I need 4:3 also with dar=1.85:1.

  



  How can I achieve this ? I tried to change ratio of input images with -aspect 4:3 but this leads to the resolution of the video be only 4:3 without dar=1.85:1

  


• Ffmpeg change aspect ratio do not succeeded

  23 mars 2020, par Ngoral

  I’m trying to change the aspect ratio of video, cause it’s being showed in a wrong way (it sould be 16:9 but shows 3:4).
  I’ve tried a lot of things, and none worked.
  E.g. I’ve tried to set SAR, but it changes DAR, so the aspect ratio stays the same. Here’s an example :

  ffmpeg -y -i rtmp://localhost/in/air-hdmi -vf "setsar=sar=16/9" -f flv rtmp://localhost/in/ngoraltestffmpeg 
  
  
  
  
  
      ffmpeg version N-80388-gfd1d84b Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  
    configuration: --prefix=/home/anastasia/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/anastasia/ffmpeg_build/include --extra-ldflags=-L/home/anastasia/ffmpeg_build/lib --bindir=/home/anastasia/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree
  
    libavutil      55. 24.100 / 55. 24.100
  
    libavcodec     57. 46.100 / 57. 46.100
  
    libavformat    57. 38.101 / 57. 38.101
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 46.101 /  6. 46.101
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  1.100 /  2.  1.100
  
    libpostproc    54.  0.100 / 54.  0.100
  
  
  
  [flv @ 0x38143c0] audio stream discovered after head already parsed
  
  [aac @ 0x3818f20] element type mismatch 1 != 0
  
  [flv @ 0x38143c0] video stream discovered after head already parsed
  
  Input #0, flv, from 'rtmp://localhost/in/air-hdmi':
  
    Metadata:
  
      Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
  
      displayWidth    : 720
  
      displayHeight   : 576
  
      fps             : 0
  
      profile         : 
  
      level           : 
  
    Duration: 00:00:00.00, start: 181748.084000, bitrate: N/A
  
      Stream #0:0: Audio: aac (HE-AAC), 44100 Hz, stereo, fltp
  
      Stream #0:1: Video: h264 (High), yuv420p, 720x576, 25 fps, 25 tbr, 1k tbn, 50 tbc
  
  [flv @ 0x39bf5a0] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
      Last message repeated 1 times
  
  Output #0, flv, to 'rtmp://localhost/in/ngoraltest':
  
    Metadata:
  
      Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
  
      displayWidth    : 720
  
      displayHeight   : 576
  
      fps             : 0
  
      profile         : 
  
      level           : 
  
      encoder         : Lavf57.38.101
  
      Stream #0:0: Video: flv1 (flv) ([2][0][0][0] / 0x0002), yuv420p, 720x576 [SAR 16:9 DAR 20:9], q=2-31, 200 kb/s, 25 fps, 1k tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc57.46.100 flv
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
      Stream #0:1: Audio: mp3 (libmp3lame) ([2][0][0][0] / 0x0002), 44100 Hz, stereo, fltp
  
      Metadata:
  
        encoder         : Lavc57.46.100 libmp3lame
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (h264 (native) -> flv1 (flv))
  
    Stream #0:0 -> #0:1 (aac (native) -> mp3 (libmp3lame))
  
  Press [q] to stop, [?] for help
  
  [aac @ 0x3a37000] element type mismatch 1 != 0
  
      Last message repeated 7 times
  
  [flv @ 0x39bf5a0] Failed to update header with correct duration.ate= 942.7kbits/s speed=2.37x    
  
  [flv @ 0x39bf5a0] Failed to update header with correct filesize.
  
  frame=  112 fps= 48 q=31.0 Lsize=     633kB time=00:00:05.18 bitrate= 999.9kbits/s speed=2.23x    
  
  video:546kB audio:82kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.846813%
  
  Exiting normally, received signal 2.

  Using setdar=16/9 do not succeeds : it changes PAR, so the result is the same :

  Input #0, flv, from 'rtmp://localhost/in/air-hdmi':
  
    Metadata:
  
      Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
  
      displayWidth    : 720
  
      displayHeight   : 576
  
      fps             : 0
  
      profile         : 
  
      level           : 
  
    Duration: 00:00:00.00, start: 287464.746000, bitrate: N/A
  
      Stream #0:0: Audio: aac (HE-AAC), 44100 Hz, stereo, fltp
  
      Stream #0:1: Video: h264 (High), yuv420p, 720x576, 25 fps, 25 tbr, 1k tbn, 50 tbc
  
  [flv @ 0x3a5ea20] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.
  
      Last message repeated 1 times
  
  Output #0, flv, to 'rtmp://localhost/in/ngoraltest':
  
    Metadata:
  
      Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
  
      displayWidth    : 720
  
      displayHeight   : 576
  
      fps             : 0
  
      profile         : 
  
      level           : 
  
      encoder         : Lavf57.38.101
  
      Stream #0:0: Video: flv1 (flv) ([2][0][0][0] / 0x0002), yuv420p, 720x576 [SAR 64:45 DAR 16:9], q=2-31, 200 kb/s, 25 fps, 1k tbn, 25 tbc
  
      Metadata:
  
        encoder         : Lavc57.46.100 flv
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
      Stream #0:1: Audio: mp3 (libmp3lame) ([2][0][0][0] / 0x0002), 44100 Hz, stereo, fltp
  
      Metadata:
  
        encoder         : Lavc57.46.100 libmp3lame
  
  Stream mapping:
  
    Stream #0:1 -> #0:0 (h264 (native) -> flv1 (flv))
  
    Stream #0:0 -> #0:1 (aac (native) -> mp3 (libmp3lame))
  
  Press [q] to stop, [?] for help

  (When use setsar, the params are 720x576 [SAR 16:9 DAR 20:9], when setdar — 720x576 [SAR 64:45 DAR 16:9])

  I’ve also tried to apply scale=720:-1 and -aspect 16:9 and all left the same.

  BUT ! Wnen I write ffplay -vf setsar=16/9 rtmp://localhost/in/ngoraltest it shows perfectly what I need.
  What could be thae problem and hoe to solve it ?

  P.S. I’m little bit confused that there’s no onformation about SAR and DAR of input signal, but I can do totally nothing with it.

• How can I remove “original display aspect ratio 16:9” from a mp4 file using ffmpeg ?

  21 juin 2020, par Михаил Бурд

  I wish to remove the Original display aspect ratio entry from the video section.

  


  Video
ID                                       : 2
Format                                   : DV
Format settings, wrapping mode           : Frame
Codec ID                                 : 0D01030102020201-0401020202010200
Duration                                 : 1 h 34 min
Bit rate mode                            : Constant
Bit rate                                 : 24.4 Mb/s
Width                                    : 720 pixels
Height                                   : 576 pixels
Display aspect ratio                     : 4:3
Original display aspect ratio            : 16:9
Frame rate mode                          : Constant
Frame rate                               : 25.000 FPS
Standard                                 : PAL
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Interlaced
Scan order                               : Bottom Field First
Compression mode                         : Lossy
Bits/(Pixel*Frame)                       : 2.357
Time code of first frame                 : 00:00:00:01
Time code source                         : Subcode time code
Stream size                              : 16.1 GiB (76%)
Title                                    : Picture
Color range                              : Limited
Transfer characteristics                 : BT.601


  


  If I want to remove the Original display aspect ratio entry completely, what ffmpeg command can I use to achieve that ?
Thank you.