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• ffmpeg ignoring framerate settings when trancsoding mp4 to mxf

  5 avril 2024, par Matt B

  I'm using ffmpeg to transcode an mp4 file to an mxf file for proxies.

  


  The main problem : ffmpeg ignores my framerate settings and always encodes the output video at 59.9 fps instead of the requested 58.

  


  In this case, the input video has an FPS of 58 (actually an avg framerate of 57442500/996461 as reported by an ffmpeg probe), and I require the output to match, but ffmpeg overrides me and sets it to 59.9.

  


  No matter what I try, I cannot get ffmpeg to write the output file at 58 fps. I've tried the -r and -framerate arguments and I've tried the fps=58 option with vf. I've also tried setting -vsync cfr, but no luck. I've also tried using the average framerate from the probe (57442500/996461), but again, no change. I've also tried specifying the framerate in the input to match that reported by the probe (no luck).

  


  Here's my code in ffmpeg-python.

  


  in_video = 'video.mp4'
out_video = 'video.mxf'

(
    ffmpeg
    .input(
        in_video,
    )
    .output(
        out_video,
        r=58,
    )
    .global_args('-report')
    .run()
)


  


  And here is the raw command, which I've tried manually entering as well.

  


  ffmpeg -i "video.mp4" -r 58 "video.mxf" -report


  


  Despite my output settings, the resulting video has an output framerate of 60000/10001 instead of 58/1 or 57442500/996461.

  


  Is there something obious I'm missing ? Does the mxf format require certain framerates ?

  


  The source video was recorded with my phone, a Google Pixel 6a, if that matters. The r_frame_rate reported by the probe is 60000/1001 while the avg_frame_rate is the aforementioned 57442500/996461, which is what my editor reports as well.

  


  Alternatively, I'm open to other proxy format suggestions. Though I'll say that .mxf files seem to be the best trade in file size and editing latency I've seen so far. Unfortunately, DaVinci Resolve, my editor, requires the proxy to have the same framerate as the source.

  


  Edit to add report for Gyan

  


  Source code

  


  from pathlib import Path
import ffmpeg

src = Path(
    r"K:\StackO\vid.mp4"
)
dest = src.with_suffix('.mxf')


(
    ffmpeg
    .input(
        str(src),
    )
    .output(
        str(dest),
        r=58,
    )
    .global_args('-report')
    .run()
)


  


  Report on pastebin. It was too large to post on SO, and even too large for pasetbin, so I omitted the middle 8,000 lines starting at line 884. Hopefully I only removed superfluous stuff.

  


• FFMPEG install on server

  23 juillet 2013, par s19k15

  I have an online server (shared hosting plan) in linux, i do not know a lot stuff about linux and i am trying to install ffmpeg.

  I have tryied a lot of scripts but no luck.
  Now i am trying to install the below script via putty.
  <a href="https://github.com/heidisoft/FFMPEG-install-script-for-shared-host" rel="nofollow">https://github.com/heidisoft/FFMPEG-install-script-for-shared-host</a>

  When the install was running i get this message and the installation stops...

  Installation of MPlayer-1.0rc1.tar.bz2 ....... started
  
    % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
  
                                   Dload  Upload   Total   Spent    Left  Speed
  
  100  1233  100  1233    0     0   7713      0 --:--:-- --:--:-- --:--:--  7803
  
  bzip2: (stdin) is not a bzip2 file.
  
  tar: Child returned status 2
  
  tar: Error is not recoverable: exiting now
  
  mplayer.sh: line 32: cd: MPlayer-1.0rc1/: No such file or directory
  
  mplayer.sh: line 33: ./configure: No such file or directory
  
  make: *** No targets specified and no makefile found.  Stop.
  
  make: *** No rule to make target `install'.  Stop.
  
  cp: cannot stat `etc/codecs.conf': No such file or directory
  
  Installation of MPlayer-1.0rc1.tar.bz2 ....... Completed
  
  
  
          Mplayer installation Failed :( , please visit the forum

  What can i do to install ??? Thanks !

• Way to bypass video upload when testing using Rspec

  1er mars 2014, par Justin

  I'm testing a page on my app that shows videos. I'm trying to speed up the test by bypassing the video upload process or another way ??

  Maybe I'm using FactoryGirl incorrectly for file uploads..

  Using FactoryGirl, I'm creating the video with

  FactoryGirl.define do
  
   factory :video do
  
    user_id 1
  
    type "Live"
  
    title "FooBar"
  
    description "Foo bar is the description"
  
    video { fixture_file_upload(Rails.root.join('spec', 'files', 'concert.mov'), 'video/mp4') }
  
   end
  
  end

  And in the request's spec I'm describing the videos as :

  describe "videos page" do
  
  
  
    let(:user) { FactoryGirl.create(:user) }
  
    let!(:video1) { FactoryGirl.create(:video) }
  
  
  
    before { visit user_video_path(user) }
  
  
  
    it { should have_title(user.name) }
  
    it { should have_content(user.name) }
  
  
  
    describe "videos" do
  
      it { should have_content(video1.description) }
  
    end
  
  end

  Now, everytime I run the test for this page it goes through the file upload process which takes more time. I'm also using FFmpeg

  **video.rb (video model)**
  
  
  
  validates :video, presence: true
  
  has_attached_file :video, :styles => {
  
                                        :medium => { :geometry => "640x480", :format => 'mp4' },
  
                                        :thumb => { :geometry => "470x290#", :format => 'jpg', :time => 10 }
  
                                       }, 
  
                            :processors => [:ffmpeg]

  What this does when I test the page is the CLI goes through the video upload process like it would if you were uploading the video and watching your local server.