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• How to automatically remove black bars using ffmpeg and powershell ?

  7 avril 2020, par timlwsk

  Thanks to the help of the user mklement0 I got this script to automatically convert all files in the folder "video_old" and move them into "video_new", all while keeping the original filename. Original Post.

  



  Now I want to remove the black bars in the container. I know that there is "cropdetect" but AFAIK you have to manually parse the the value into the script manually. How can I automate this process using PowerShell ?

  



  Get-ChildItem .\video_old -Filter *.mkv | ForEach-Object {
  .\ffmpeg.exe -i $_.FullName -c:v libx265 -crf 18 ".\video_new\$($_.Name)"
}


  


• How to add black frames and keep the framerate ?

  3 mars 2020, par Patryk

  I have a black image from which I generate videos filled with black color only for specified lengths that I can then concatenate with my destination videos. This is how I produce it :

  ffmpeg -loop 1 -i black.png -t 00:00:00.066 \ 
  
      -c:v libx264 -pix_fmt yuv420p -vf scale=840:480,fps=15 out66ms.mp4

  with the following ffmpeg output :

  Input #0, png_pipe, from 'black.png':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: png, rgba(pc), 608x342 [SAR 5669:5669 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (png (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  [libx264 @ 0x7fadf3826e00] using SAR=64/63
  
  [libx264 @ 0x7fadf3826e00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  [libx264 @ 0x7fadf3826e00] profile High, level 3.0
  
  [libx264 @ 0x7fadf3826e00] 264 - core 155 r2917 0a84d98 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - 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=12 lookahead_threads=2 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=15 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'out66ms.mp4':
  
    Metadata:
  
      encoder         : Lavf58.29.100
  
      Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 840x480 [SAR 64:63 DAR 16:9], q=-1--1, 15 fps, 15360 tbn, 15 tbc
  
      Metadata:
  
        encoder         : Lavc58.54.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1
  
  frame=    1 fps=0.0 q=27.0 Lsize=       2kB time=00:00:00.00 bitrate=201107.7kbits/s speed=0.0031x
  
  video:1kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 100.984009%
  
  [libx264 @ 0x7fadf3826e00] frame I:1     Avg QP:12.00  size:   123
  
  [libx264 @ 0x7fadf3826e00] mb I  I16..4: 100.0%  0.0%  0.0%
  
  [libx264 @ 0x7fadf3826e00] 8x8 transform intra:0.0%
  
  [libx264 @ 0x7fadf3826e00] coded y,uvDC,uvAC intra: 0.0% 0.0% 0.0%
  
  [libx264 @ 0x7fadf3826e00] i16 v,h,dc,p: 97%  0%  3%  0%
  
  [libx264 @ 0x7fadf3826e00] i8c dc,h,v,p: 100%  0%  0%  0%
  
  [libx264 @ 0x7fadf3826e00] kb/s:14.76

  I’d like to then concatenate it with videos like this one :

  ffprobe file.ts
  
  Input #0, mpegts, from 'file.ts':
  
    Duration: 00:00:06.67, start: 0.000000, bitrate: 1090 kb/s
  
    Program 1
  
      Metadata:
  
        service_name    : Service01
  
        service_provider: FFmpeg
  
      Stream #0:0[0x100]: Video: h264 (Baseline) ([27][0][0][0] / 0x001B), yuv420p(progressive), 864x480, 90k tbr, 90k tbn, 180k tbc

  but as soon as I concatenate it using concat demuxer like that :

  ffmpeg -y -hide_banner \
  
      -f concat -safe 0 \
  
      -i <(echo "file '$PWD/out66ms.mp4'"; for f in dir/*.ts; do echo "file '$PWD/$f'"; done) \
  
      -c copy \
  
      output.mp

  I get this :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.29.100
  
    Duration: 00:01:41.38, start: 0.000000, bitrate: 170 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 840x480 [SAR 64:63 DAR 16:9], 170 kb/s, 2.67 fps, 2.67 tbr, 15360 tbn, 30 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler

  Which has 2.67 fps whereas not adding this empty black video to concatenation gives the following (desired 15 fps) :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.29.100
  
    Duration: 00:00:17.29, start: 0.000000, bitrate: 1001 kb/s
  
      Stream #0:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 864x480, 999 kb/s, 15.62 fps, 15.58 tbr, 90k tbn, 180k tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler

  EDIT

  I’ve tried reencoding instead of copying :

  ffmpeg -y -hide_banner \
  
      -f concat -safe 0 \
  
      -i <(echo "file '$PWD/out66ms.mp4'"; for f in dir/*.ts; do echo "file '$PWD/$f'"; done) \
  
      -c:v libx264 -vf scale=840:480,fps=15 \
  
      output.mp

  But I get a similar result :

  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf58.29.100
  
    Duration: 00:01:41.00, start: 0.000000, bitrate: 555 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1680x480 [SAR 64:63 DAR 32:9], 554 kb/s, 15 fps, 15 tbr, 15360 tbn, 30 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler

  even though that the fps is set properly the video is too long and slowed down.

  How to properly add those black filled videos to preserve fps or set it to desired value ?

• How can I add "retro-looking" black round cornert to my videos ?

  4 mars 2020, par user3018558

  I’m looking to add (e.g. overlay) some retro/cinematic effect to my video and specifically the black rounded corners.
  Can this be achieved via ffmpeg ? I’m actually using Handbrake mainly but since it relies on ffmpeg I guess I could pass something as a parameter in Handbrake’s Video/Advanced/options to affect the output file ?

  I mean one option would be to add an overlay I guess like :
  

  But considering the input files have different resolution/aspect-ration I would ideally be looking to have this dynamically added to the output file.

  Any idea/tip ?

  Thanks