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• avfilter/f_drawgraph : stop making foreground color transparent

  2 août 2015, par Paul B Mahol

  avfilter/f_drawgraph : stop making foreground color transparent
  

  • [DH] libavfilter/f_drawgraph.c

• How would I go about making a screen recorder ?

  23 juillet 2016, par JamDoggie

  I understand mp4 files, AVI files, the list goes on. I also understand encoding and compression and bitrate. I wouldn’t say I’m an expert at c#, but I understand it well enough to make a browser with cef sharp(Chromium Embedded FrameWork). I would think I would use FFMPEG or direct show but I don’t understand the first thing of those to be honest or if there is even a .NET wrapper for them (there probably is though I would be surprised if there isn’t). I have done research but none of it has answered my question.

• avcodec/xbmenc : Allow for making UW images

  19 janvier 2021, par Jose Da Silva

  avcodec/xbmenc : Allow for making UW images
  I've run into some bugs where I was downloading a bunch of data and began
  
  seeing weird hiccups. For example, javascript promises to allow you to push
  
  some very long lines of data, but the hiccups I saw was with data larger
  
  than 2k in length (windows) pushed out of a child process stdout piped into
  
  the stdin of the calling parent program.
  
  Soo much for smooth promises, this was broken and would run into similar
  
  problems on a linux PC with 32k line limits.
  
  The solution was to break the data into smaller chunks than 2k - and then
  
  these data hiccups disappeared (windows PC).
  It would be expected to be similar for linux PCs (32k I think) and other
  
  OSes with different sizes.
  If the ANSI required minimum needs to be 509 chars or larger (assuming
  
  509+<CR>+<LF>+<0>=512), then 509 was chosen as the shortest worst-case
  
  scenario) in this patch.
  
  Most small pictures will go output looking pretty much the same data out
  
  until you get to about 84bytes (672 pixels wide), where lines out begin to
  
  be split. For example a UW 4K will exceed a 2k readln and a UW 10K picture
  
  approaches an 8k readln
  The purpose for this patch is to ensure that data remains below the
  
  readline limits (of 509 chars), so that programs (like javascript) can push
  
  data in large chunks without breaking into hiccups because the data length
  
  is too long to be pushed cleanly in one go.
  
  Subject : [PATCH 3/3] avcodec/xbmenc : Allow for making UW images
  Worst-case ANSI must allow for 509 chars, while Windows allows for 2048
  
  and Linux for 32K line length. This allows an OS with a small readline
  
  access limitation to fetch very wide images (created from ffmpeg).
  

  • [DH] libavcodec/xbmenc.c