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• ffmpeg add watermark by output part count (watermark1.png for part 1, ...)

  12 octobre 2020, par Steapy

  I have currently following code (not optimized yet !) :

  


  converter.StartInfo.Arguments = @"-i video.mp4 -i watermark.png -filter_complex ""overlay = x = (main_w - overlay_w) / 2:y = (main_h - overlay_h) / 2"" output%03d.mp4";


  


  This renders all my parts with the same "watermark.png" file as a watermark. But now i want to do something like this :

  


  converter.StartInfo.Arguments = @"-i video.mp4 -i watermark%03d.png -filter_complex ""overlay = x = (main_w - overlay_w) / 2:y = (main_h - overlay_h) / 2"" output%03d.mp4";


  


  "output000.mp4" has "watermark000.png" as a watermark,
"output001.mp4" has "watermark001.png" as a watermark,
"output002.mp4" has "watermark002.png" as a watermark, ...

  


  I need it in only one line, as if i would type it in cmd and it should work in c# with UseShellExecute=false.

  


  Any idea ?

  


• Generate fixed time, fixed frame count, webp animated preview with ffmpeg

  28 octobre 2020, par Paulo Neves

  I have a seemingly very simple use case that i cannot find a way to reproduce from instructions scattered on the internet, nor from the ffmpeg manual.

  


  Basically I want an arbitrary webm video to be converted into 4 frames [0, 1/4 1/2 3/4 1]ths of the video.

  


  ffmpeg -i video.webm -vf fps=1/$(echo 'scale=6;' $(ffprobe -loglevel quiet -of 'compact=nokey=1:print_section=0' -show_format_entry duration /video.webm) ' / 4' | bc)  thumbnail-%d.png


  


  Then i want these frames to generate a webp file that cycles inifinitely through each frame at 1 frame per second.

  


  img2webp -loop 0 -d 1000 -o d.webp thumbnail-*


  


  What is the single execution ffmpeg command equivalent ?

  


• Cutting out a part of a video in ffmpeg creates a corrupted output file

  30 octobre 2020, par lagmoellertim

  I currently have a problem with ffmpeg. I'm trying to cut out a part of a video (e.g. from 00:10:00 to 00:10:30).

  


  I use this command ffmpeg -ss 600 -to 630 -i not_working.mp4  not_working_part.mp4.

  


  I tried reencoding the video, but it is still corrupted (only first few frames working, video is multiple hours long but jumps to end if you try to skip).

  


  I use the -ss and the -to parameter before the -i parameter because it is much faster I want to cut out a part that is e.g. right at the end of the video. Moving the -i parameter infront of the other args solves the problem, but the performance is really bad for cutouts late in the video. For many other of my videos, both methods work without a problem.

  


  Here is some metadata about the video from ffmpeg :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'media\not_working.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: isommp42
    creation_time   : 2020-09-22T06:20:53.000000Z
  Duration: 03:03:40.04, start: 0.000000, bitrate: 537 kb/s
    Chapter #0:0: start 0.000000, end 204.120000
    Metadata:
      title           : Recording Started
    Chapter #0:1: start 204.120000, end 2045.200000
    Metadata:
      title           : Sharing Started
    Chapter #0:2: start 2045.200000, end 2056.880000
    Metadata:
      title           : Sharing Stopped
    Chapter #0:3: start 2056.880000, end 4018.280000
    Metadata:
      title           : Sharing Started
    Chapter #0:4: start 4018.280000, end 4024.760000
    Metadata:
      title           : Sharing Stopped
    Chapter #0:5: start 4024.760000, end 4096.000000
    Metadata:
      title           : Sharing Started
    Chapter #0:6: start 4096.000000, end 4101.800000
    Metadata:
      title           : Sharing Stopped
    Chapter #0:7: start 4101.800000, end 4481.920000
    Metadata:
      title           : Sharing Started
    Chapter #0:8: start 4481.920000, end 4624.480000
    Metadata:
      title           : Sharing Stopped
    Chapter #0:9: start 4624.480000, end 6902.000000
    Metadata:
      title           : Sharing Started
    Chapter #0:10: start 6902.000000, end 6906.760000
    Metadata:
      title           : Sharing Stopped
    Chapter #0:11: start 6906.760000, end 6922.880000
    Metadata:
      title           : Sharing Started
    Chapter #0:12: start 6922.880000, end 6936.800000
    Metadata:
      title           : Sharing Stopped
    Chapter #0:13: start 6936.800000, end 9140.840000
    Metadata:
      title           : Sharing Started
    Chapter #0:14: start 9140.840000, end 9145.680000
    Metadata:
      title           : Sharing Stopped
    Chapter #0:15: start 9145.680000, end 9297.600000
    Metadata:
      title           : Sharing Started
    Chapter #0:16: start 9297.600000, end 9306.040000
    Metadata:
      title           : Sharing Stopped
    Chapter #0:17: start 9306.040000, end 9572.480000
    Metadata:
      title           : Sharing Started
    Chapter #0:18: start 9572.480000, end 9620.680000
    Metadata:
      title           : Sharing Stopped
    Chapter #0:19: start 9620.680000, end 10020.760000
    Metadata:
      title           : Sharing Started
    Chapter #0:20: start 10020.760000, end 10085.480000
    Metadata:
      title           : Sharing Stopped
    Chapter #0:21: start 10085.480000, end 10781.920000
    Metadata:
      title           : Sharing Started
    Chapter #0:22: start 10781.920000, end 11020.040000
    Metadata:
      title           : Sharing Stopped
    Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 32000 Hz, mono, fltp, 53 kb/s (default)
    Metadata:
      creation_time   : 2020-09-22T06:20:53.000000Z
      handler_name    : AAC audio
    Stream #0:1(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080, 481 kb/s, 25 fps, 25 tbr, 30k tbn, 60k tbc (default)
    Metadata:
      creation_time   : 2020-09-22T06:20:53.000000Z
      handler_name    : H.264/AVC video
      encoder         : AVC Coding
    Stream #0:2(und): Data: bin_data (text / 0x74786574)
    Metadata:
      creation_time   : 2020-09-22T06:20:53.000000Z
      handler_name    : Text


  


  Here is a link to the -report log file from ffmpeg (on pastebin) : https://pastebin.com/i9ix3GsC