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• ffmpeg hundreds of videos- to-image as shell script in keyboard maestro

  28 juillet 2023, par Leopardi

  First I would like to say that I use MacOS, I am new using ffmpeg and keyboard maestro and have no little to none experience in coding. But I think I did learned a bit is the past few weeks trying to solve the problem I will ask now. Believe me I tried searching for answers online and did a lot of trial and error before coming here to ask my question.
so here is what I am trying to do :

  


  I have a folder (/Users/Documents/clips) with 450 short AVI clips (foto1.avi, foto2.avi...., foto450.avi) from which I would like to extract all frames from. I know how to extract all frames from 1 clip and copy them to an existing directory :

  


  *ffmpeg -i /Users/Documents/clips/foto1.avi /Users/Documents/Frames/Foto1/frame%06d.png *

  


  With their command all frames from the clip Foto1.avi (frame000001.png, frame000002.png...., frame000132.png) are copied to the folder /Foto1.

  


  With keyboard Maestro I created 450 folders named afters the 450 .avi clips.

  


  Is there a way to write a ffmpeg command that will extract the frames of all 450 .avi clips to the folder with the same name as the file ?

  


  I was hoping there would be a way of seeing variables in this kind of way :

  


  ffmpeg -i /Users/Documents/clips/foto%.avi /Users/Documents/Frames/Foto%/frame%06d.png

  


  I really appreciate any help. Thank you !

  


  I tried searching for answers in forums, ffmpeg database. And since I have almost no knowledge on coding sometimes is hard to decipher and understand the meaning of the code.

  


• Decoding RIMM streaming file format

  1er août 2019, par ThomasRS

  I want to decode the video (visual) frames within a Blackberry RIMM file. So far I have a parser, and some corresponding container documentation from RIM. 

  The video codec is H264 and is explicitly set on the device using one of the video.encodings properties. However, FFMPEG is not able to decode the frames and this is driving me nuts.

  Edit 1 : The issues seems to be lack of SPS and PPS in the frames, and artificially inserting them have proven unsuccessful so far (all grey image). Blackberry 9700 sends

  0x00 0x00 0x ?? 0x ?? 0xType

  where Type is according to table 7-1 in the H264 spec (I and P frames). We believe the 0x ?? 0x ?? represent the size of the frame, however the size does not always correspond to the size found by the parser (the parser seems to be working correctly).

  I have a windows decoder codec from blackberry, called mc_demux_mp2_ds.ax, and can play some MPEG-4 files captured the same way, but it is a binary for windows. And the H264 files will not play either way. I am aware of previous attempts. The capture url for javax.microedition.media.Manager is

  encoding=video-3gpp_width=176_height=144_video_codec=H264_audio_codec=AAC

  and I am writing to an output stream. Some example files here.

  Edit 2 :Turns out that about 3-4 of the 12-15 available video capture modes are flat out failing and refusing to output data, even in the simplest of test applications. So any working solution should implement MPEG-4, H264 and H263 in both AMR and AAC, in so getting fallback alternatives when one sound codec and/or resolution fails. Reboots, hangs and what not litters the Blackberry video implementation and vary from firmware to firmware ; total suckage.

• Evolution #4754 : Mettre à jeu le jeu des icônes de extensions

  30 avril 2021, par b b

  Amha, SVG partout et zou, et si nécessaire on pourra générer du PNG en masse à partir des SVG.

  Je proposais donc le pack Yaru https://github.com/ubuntu/yaru/tree/master/icons/src/fullcolor/mimetypes (icônes d’Ubuntu) complet, sobre mais il est trop coloré et "en relief" maintenant qu’on est plutôt en mode flat sur le jeu d’icônes du privé, exemples :

  https://github.com/ubuntu/yaru/blob/master/icons/src/fullcolor/mimetypes/text-markdown.svg
  https://github.com/ubuntu/yaru/blob/master/icons/src/fullcolor/mimetypes/x-office-spreadsheet.svg

  Sinon, il y a aussi Papirus & Vimix, et surtout Numix qui est très fourni :

  https://github.com/PapirusDevelopmentTeam/papirus-icon-theme/blob/master/Papirus/64x64/mimetypes/application-pdf.svg
  https://github.com/vinceliuice/vimix-icon-theme/blob/master/src/scalable/mimetypes/application-pdf.svg
  https://github.com/numixproject/numix-icon-theme/blob/master/Numix/64/mimetypes/application-pdf.svg