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• Scaling videos for device that doesn't support aspect ratio metadata

  18 juillet 2017, par forthrin

  I have hundreds of videos which are all approximately 4:3 format, but with different resolutions and various cropping (eg. videos may be 640x480, 640x470, 630x480, etc.).

  I converted the videos into a fixed screen size (160x128) for a primitive device. When playing the videos on the device, some appear "thin", while in VLC on my computer, the aspect ratio is correct.

  I assume the reason for this is that the video player on the primitive device doesn’t honour the aspect ratio metadata in the video file. Here are two examples of metadata :

  • 320x240 SAR=1:1 DAR=4:3 (Displays correctly on device and desktop)
  • 480x480 SAR=4:3 DAR=4:3 (Displays thin on device, correct on desktop)

  How can I create a general command line that will give all videos correct playback on my primitive device, regardless of their original size and aspect ratio ?

  The best would be to somehow ask ffmpeg to remove the metadata, and compensate for it when scaling. Another possible option would be to add black bars so the video is always 160x128 pixels.

  I’m open to any solution. Below is my current version :

  for f in *; do ffmpeg -i $f -vcodec mpeg4 -vf scale=160:-1 out/$f; done

• ffmpeg : aspect ratio of image in a slideshow

  26 juin 2020, par worov

  I have a bunch of images PNG files. I'm trying to make a slideshow with these using ffmpeg. The images are 3000*4000. These images don't have all the same aspect ratio.

  



  Some are like these :

  



  

  



  Some are like this :

  



  

  



  I used the command :

  



  ffmpeg -loop 1 -framerate 1/10 -i img%3d.png -i audio.wav -vf scale=w=3840:h=-1 -vcodec libx264 -crf 14 -r 60 -pix_fmt yuv420p -shortest output.mp4


  



  It returns me this :

  



     ffmpeg version 3.3.2 Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 6.3.0 (Debian 6.3.0-18) 20170516
  configuration: --disable-decoder=amrnb --disable-decoder=libopenjpeg --disable-mips32r2 --disable-mips32r6 --disable-mips64r6 --disable-mipsdsp --disable-mipsdspr2 --disable-mipsfpu --disable-msa --disable-libopencv --disable-podpages --disable-stripping --enable-avfilter --enable-avresample --enable-gcrypt --enable-gnutls --enable-gpl --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libilbc --enable-libkvazaar --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx265 --enable-libxvid --enable-libzvbi --enable-nonfree --enable-opengl --enable-openssl --enable-postproc --enable-pthreads --enable-shared --enable-version3 --incdir=/usr/include/x86_64-linux-gnu --libdir=/usr/lib/x86_64-linux-gnu --prefix=/usr --toolchain=hardened --enable-frei0r --enable-chromaprint --enable-libx264 --enable-libiec61883 --enable-libdc1394 --enable-vaapi --disable-opencl --enable-libmfx --disable-altivec --shlibdir=/usr/lib/x86_64-linux-gnu
  libavutil      55. 58.100 / 55. 58.100
  libavcodec     57. 89.100 / 57. 89.100
  libavformat    57. 71.100 / 57. 71.100
  libavdevice    57.  6.100 / 57.  6.100
  libavfilter     6. 82.100 /  6. 82.100
  libavresample   3.  5.  0 /  3.  5.  0
  libswscale      4.  6.100 /  4.  6.100
  libswresample   2.  7.100 /  2.  7.100
  libpostproc    54.  5.100 / 54.  5.100
Input #0, image2, from 'img%3d.png':
  Duration: 00:02:30.00, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: png, rgb24(pc), 4000x3000 [SAR 7087:7087 DAR 4:3], 0.10 tbr, 0.10 tbn, 0.10 tbc
Guessed Channel Layout for Input Stream #1.0 : stereo
Input #1, wav, from 'audio.wav':
  Duration: 01:54:44.14, bitrate: 1536 kb/s
    Stream #1:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s16, 1536 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
  Stream #1:0 -> #0:1 (pcm_s16le (native) -> aac (native))
Press [q] to stop, [?] for help
[libx264 @ 0x55c1be935420] using SAR=1/1
[libx264 @ 0x55c1be935420] frame MB size (240x180) > level limit (36864)
[libx264 @ 0x55c1be935420] MB rate (2592000) > level limit (2073600)
[libx264 @ 0x55c1be935420] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0x55c1be935420] profile High, level 5.2
[libx264 @ 0x55c1be935420] 264 - core 150 - H.264/MPEG-4 AVC codec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=14.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to 'output.mp4':
  Metadata:
    encoder         : Lavf57.71.100
    Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p(progressive), 3840x2880 [SAR 1:1 DAR 4:3], q=-1--1, 60 fps, 15360 tbn, 60 tbc
    Metadata:
      encoder         : Lavc57.89.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
    Stream #0:1: Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc57.89.100 aac
[image2 @ 0x55c1be8edde0] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
More than 1000 frames duplicated    5309kB time=00:00:09.13 bitrate=4762.0kbits/s dup=599 drop=0 speed=0.164x   
More than 10000 frames duplicated 137722kB time=00:02:39.13 bitrate=7089.8kbits/s dup=9584 drop=0 speed=0.174x   
More than 100000 frames duplicated429964kB time=00:27:39.13 bitrate=7060.5kbits/s dup=99434 drop=0 speed=0.173x   
frame=413401 fps= 10 q=-1.0 Lsize= 5962186kB time=01:54:49.96 bitrate=7088.9kbits/s dup=413310 drop=0 speed=0.173x   
video:5831116kB audio:117825kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.222641%
[libx264 @ 0x55c1be935420] frame I:2068  Avg QP: 6.65  size:2816521
[libx264 @ 0x55c1be935420] frame P:104040 Avg QP:10.85  size:   470
[libx264 @ 0x55c1be935420] frame B:307293 Avg QP:16.51  size:   318
[libx264 @ 0x55c1be935420] consecutive B-frames:  0.8%  0.0%  0.5% 98.7%
[libx264 @ 0x55c1be935420] mb I  I16..4:  7.3% 54.6% 38.1%
[libx264 @ 0x55c1be935420] mb P  I16..4:  0.0%  0.0%  0.0%  P16..4:  0.2%  0.0%  0.0%  0.0%  0.0%    skip:99.8%
[libx264 @ 0x55c1be935420] mb B  I16..4:  0.0%  0.0%  0.0%  B16..8:  0.0%  0.0%  0.0%  direct: 0.0%  skip:100.0%  L0:49.5% L1:50.5% BI: 0.0%
[libx264 @ 0x55c1be935420] 8x8 transform intra:54.6% inter:97.9%
[libx264 @ 0x55c1be935420] coded y,uvDC,uvAC intra: 98.2% 92.7% 92.2% inter: 0.0% 0.0% 0.0%
[libx264 @ 0x55c1be935420] i16 v,h,dc,p: 17% 12% 36% 35%
[libx264 @ 0x55c1be935420] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 18% 26% 13%  5%  6%  6%  9%  6% 11%
[libx264 @ 0x55c1be935420] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 15% 24% 11%  7%  9%  7% 10%  7% 11%
[libx264 @ 0x55c1be935420] i8c dc,h,v,p: 40% 33% 18% 10%
[libx264 @ 0x55c1be935420] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x55c1be935420] ref P L0: 99.6%  0.0%  0.4%  0.0%
[libx264 @ 0x55c1be935420] ref B L0: 21.9% 78.1%  0.0%
[libx264 @ 0x55c1be935420] ref B L1: 99.5%  0.5%
[libx264 @ 0x55c1be935420] kb/s:6933.00
[aac @ 0x55c1be938aa0] Qavg: 640.546


  



  But the second image is distorted in the video (I can't show you because I don't have enough reputation to post more links).

  



  So I would like to preserve the aspect ratio of each picture : the images shouldn't be distorted. What command should I use for this ?

  



  Thanks in advance.

  


• 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