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• avformat/matroskadec : Accept more unknown-length elements

  17 mai 2019, par Andreas Rheinhardt

  avformat/matroskadec : Accept more unknown-length elements
  The current Matroska specifications mandate that only two elements may
  
  use an unknown-length length : Segments and clusters. But this was not
  
  always so : For the greater part of Matroska's existence, all master
  
  elements were allowed to make use of the unknown-length feature.
  And there were muxers creating such files : For several years
  
  libavformat's Matroska muxer used unknown-length for all master
  
  elements when the output wasn't seekable. This only stopped in March
  
  2010 with 2529bb30. And even afterwards it was possible (albeit
  
  unlikely) for libavformat to create unknown-length master elements
  
  that are in violation of today's specifications, namely if the master
  
  element was so big that the seek backwards to update the size could
  
  no longer be performed inside the AVIOContext's write buffer. This
  
  has only been fixed in October 2016 (with the patches that introduced
  
  support for writing CRC-32 elements).
  Libavformat's Matroska demuxer meanwhile has never really supported
  
  unknown-length elements besides segments and clusters. Support for the
  
  latter was hardcoded. This commit changes this : Now all master elements
  
  for which a syntax to parse them is available are supported. This
  
  includes the files produced by old versions of libavformat's muxer.
  More precisely, master elements that have unknown length and are about
  
  to be parsed (not skipped) are supported ; only a warning is emitted for
  
  them. For normal files, this means that level 1 elements after the
  
  clusters that are encountered after the clusters have been parsed (i.e.
  
  not because they are referenced by the seekhead at the beginning of the
  
  file) are still unsupported (they would be skipped at this point if
  
  their length were known).
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/matroskadec.c

• Where to (long time) host Spring Boot Application with Data Base Backup and Linux Root Access [closed]

  22 mai 2024, par Lord Helmchen

  I developed a small application for my father. It uses Spring Boot, MySQL and FFMPEG, which I currently installed on Linux.

  


  I want to host it, deploy it automatically, have a back up and root access for FFMPEG installation.

  


  It runs smoothly locally on Windows / Linux, now I want to host it somewhere.

  


  What I would like to have :

  


  

  • Ease of deployment : I got experience in adminstration of linux root servers, but I look for something easy to integrate and maybe automatically deploy it from Github or Gitlab

  


  • Backup : I want to backup the database ideally to another service provider in case something goes wrong.

  


  • Linux : One Part of it, amongs others is to convert different audio formats using ffmpeg.
So, (I think) I need linux root access as well.

  


  • Time Horzion : I would like to make sure it still runs in ten+ years, so it should be a reliable provider where I only update the application from time to time if needed.

  


  • Money : As it is only for personal use at this moment, I don't want to invest a fortune.

  


  


  What provider and deployment pipeline would you recommend to me ?

  


• FFMpeg - Combine multiple filter_complex and overlay functions

  7 juin 2016, par Mike Johnson

  I am having trouble combining these 3 passes in ffmpeg into a single process.

  Is this even possible ?

  Pass 1

  ffmpeg -y -i C:\Users\MJ\Downloads\20151211_pmoney_pmpod.mp3 -loop 1 -i C:\Users\MJ\Documents\pm1080.png  -filter_complex "[0:a]showwaves=s=1920x1080:mode=line,colorkey=0x000000:0.01:0.1,format=yuva420p[v];[1:v][v]overlay=0:270[outv]" -map "[outv]" -pix_fmt yuv420p -map 0:a -c:v libx264 -c:a copy -shortest C:\Users\MJ\Documents\20151211_pmoney_pmpod4.mp4

  Pass 2

  ffmpeg -i "C:\Users\MJ\Documents\20151211_pmoney_pmpod4.mp4" -vf drawtext="fontsize=50:fontcolor=white:fontfile=/Windows/Fonts/impact.ttf:text=Planet Money Podcast on NPR - A/B Split Testing:x=(w-text_w)/2:y=200" -acodec copy "C:\Users\MJ\Documents\20151211_pmoney_pmpod-overlay-text.mp4"

  Pass 3

  ffmpeg -i "C:\Users\MJ\Documents\20151211_pmoney_pmpod-overlay-text.mp4" -i C:\Users\MJ\Downloads\6.png -filter_complex "overlay=10:10" C:\Users\MJ\Documents\20151211_pmoney_pmpod-overlay-text1.mp4"

  Thanks !