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• Using ffmpeg with frei0r on windows 10. Can't find module from frei0r

  21 février 2023, par Denis

  I am trying to add a filter to my video using ffmpeg and frei0r filters on windows 10. ffmpeg.exe is located in the system32 folder. ffmpeg works fine on other tasks. As soon as I try to add the frei0r filter, I get an error :

  


  Could not find module 'glow'.
Error initializing filter 'frei0r' with args 'glow:20'


  


  I downloaded the frei0r dll files from the official site and placed them in the system32 folder, and then placed them in another folder. Additionally, I registered the path :

  


  set FREI0R_PATH=C:\WINDOWS\system32\frei0r-1


  


  In cmd I enter the following command :

  


  ffmpeg -loglevel debug -i 1.mp4 -vf "frei0r=glow:20" -t 10 1out.mp4


  


  help me

  


  I tried everything I saw online and nothing helped.

  


• how to write subcommand to FFPLAY during playback using subprocess module ?

  4 mars 2023, par ChienMouille

  I'm trying to pause a video playback started with FFPLAY through a python subprocess. You can do this manually by pressing the "p" key on the keyboard while the video is playing. I'd like to emulate this behavior through a python call.

  


  I'm now sending a "p" string, encoded as bytes, through the stdin of the Popen call. The video starts and I can pause it with the keyboard but the communicate command doesn't seem to do anything.

  


  import subprocess
import time

proc = subprocess.Popen(['ffplay', 'PATH_TO_'],
                        stdin=subprocess.PIPE,
                        stdout=subprocess.PIPE,
                        )
time.sleep(2) # just waiting to make sure playback has started
proc.communicate(input="p".encode())[0]



  


  Thanks in advance !

  


• FFMPEG color key filter applied, output to a transparent HEVC mov file, speed is different

  2 mars 2023, par Patrick Vellia

  I have an original recording that has the following ffprobe output :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':
  Metadata:
    major_brand     : mp41
    minor_version   : 538120216
    compatible_brands: mp41
    creation_time   : 2023-02-28T19:06:41.000000Z
    firmware        : H21.01.01.50.00
  Duration: 00:00:08.15, start: 0.000000, bitrate: 60160 kb/s
  Stream #0:0(eng): Video: hevc (Main) (hvc1 / 0x31637668), yuvj420p(pc, bt709), 3840x2160 [SAR 1:1 DAR 16:9], 59891 kb/s, 119.88 fps, 119.88 tbr, 120k tbn, 119.88 tbc (default)
    Metadata:
      creation_time   : 2023-02-28T19:06:41.000000Z
      handler_name    : GoPro H.265
      vendor_id       : [0][0][0][0]
      encoder         : GoPro H.265 encoder
      timecode        : 19:05:32:105
  Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s (default)
    Metadata:
      creation_time   : 2023-02-28T19:06:41.000000Z
      handler_name    : GoPro AAC  
      vendor_id       : [0][0][0][0]
      timecode        : 19:05:32:105
  Stream #0:2(eng): Data: none (tmcd / 0x64636D74), 0 kb/s (default)
    Metadata:
      creation_time   : 2023-02-28T19:06:41.000000Z
      handler_name    : GoPro TCD  
      timecode        : 19:05:32:105
  Stream #0:3(eng): Data: bin_data (gpmd / 0x646D7067), 76 kb/s (default)
    Metadata:
      creation_time   : 2023-02-28T19:06:41.000000Z
      handler_name    : GoPro MET  
Unsupported codec with id 0 for input stream 2
Unsupported codec with id 100359 for input stream 3


  


  This video is chroma keyed, so I ran the following command the key out the green and export it to a HEVC mov container (the Apple HEVC supports alpha channel via the videotoolbox codec) :

  


  ffmpeg -i test.mp4 -vf colorkey=0x00b140:0.3:0.1 -vcodec hevc_videotoolbox -alpha_quality 0.5 -tag:v hvc1 output1.mov


  


  which results in this ffprobe :

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output1.mov':
  Metadata:
    major_brand     : qt  
    minor_version   : 512
    compatible_brands: qt  
    encoder         : Lavf58.76.100
  Duration: 00:00:08.15, start: 0.000000, bitrate: 366946 kb/s
  Stream #0:0(eng): Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, gbr/bt709/bt709, progressive), 3840x2160 [SAR 1:1 DAR 16:9], 367188 kb/s, 119.88 fps, 119.88 tbr, 120k tbn, 120k tbc (default)
    Metadata:
      handler_name    : GoPro H.265
      vendor_id       : FFMP
      encoder         : Lavc58.134.100 hevc_videotoolbo
      timecode        : 19:05:32:105
  Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 118 kb/s (default)
    Metadata:
      handler_name    : GoPro AAC  
      vendor_id       : [0][0][0][0]
  Stream #0:2(eng): Data: none (tmcd / 0x64636D74), 0 kb/s
    Metadata:
      handler_name    : GoPro H.265
      timecode        : 19:05:32:105
Unsupported codec with id 0 for input stream 2


  


  When the play the original video inside a web browser, it will play normally. As in, the video doesn't play in slo-mo but at "normal speed" which is what I actually want. User can slow it down and still have the frames necessary to keep the clarity when desired.

  


  However, when I play the second video, it is unnaturally slow even at 2x the speed.

  


  The only difference I can see above is that the export didn't include the second data stream (input 3).

  


  This was recorded on a GoPro Hero 10. I am using FFMPEG 4.6.

  


  Any help would be appreciated to fine tune the command.