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• How can I make windows "like" the mp4 files I create in Linux and sync with Rsync

  17 juillet 2019, par Geoff Fox

  I am a meteorologist on TV remotely from a studio I built. My control room uses a TriCaster, an amazing studio-in-a-box which runs on a Windows 7 variant. I make my weather maps myself on a Centos 7 machine — around 40,000/day.

  I don’t entirely understand the problem, but here’s a quote from someone helping me at NewTek (the TriCaster company)

  Rsync is built on a *nix based environment where all the file permissions and attributes are based on the Linux environment. There is no meaning for this in NTFS and Windows. The result is you get files that will most likely have the read-only flag set or no flag at all. Other attributes will be delivered as null. I’m sure from your own programming experience, programs don’t like null values and they generally have to be accounted for very specifically.

  And so the finely tuned TriCaster stumbles, meaning lost frames or other problems caused by my short weather animations.

  Here are some samples of the Rsync code I use

  rsync -r -t -s -v --no-p --chmod=ugo=rwX /var/www/html/output/loops/mp4/conus*.mp4 /mnt/tricaster/Clips/Import
rsync -r -t -s -v --no-p --chmod=ugo=rwX /var/www/html/output/loops/mp4/nebraska*.mp4 /mnt/tricaster/Clips/Import
rsync -r -t -s -v --no-p --chmod=ugo=rwX /var/www/html/output/loops/mp4/northernplains*.mp4 /mnt/tricaster/Clips/Import

  These are mp4 files. They are only used locally. I really don’t care what flags are checked and permissions filled as long as Windows 7 doesn’t care.

  At this point I always like to tell folks, though I do write some code my last computer class was in high school,’67-68 semester. Thanks in advance for your help.

• ffmpeg subtitle font size too big

  21 avril 2020, par Harry Vũ

  After making subtitles in Aegisub, I save it as .ass file, with font size set from style manager,
I used this command

  



  ffmpeg -i video.mp4 -b:v 1M -vf subtitles=subtitle.ass out.mp4


  



  but the output file has the font a few sizes too big, larger than the original size I set in Aegisub.
Did I do something wrong ?
This was the intended size :

  



  

  



  And this is the output size :

  



  

  



  Here's the ass file
ass file

  


• h264 : don’t sync pic_id between threads.

  3 avril 2017, par Ronald S. Bultje

  h264 : don’t sync pic_id between threads.
  This is how the ref list manager links bitstream IDs to H264Picture/Ref
  
  objects, and is local to the producer thread. There is no need for the
  
  consumer thread to know the bitstream IDs of its references in their
  
  respective producer threads.
  In practice, this fixes tsan warnings when running fate-h264 :
  WARNING : ThreadSanitizer : data race (pid=19295)
  
    Read of size 4 at 0x7dbc0000e614 by main thread (mutexes : write M1914) :
  
      #0 ff_h264_ref_picture src/libavcodec/h264_picture.c:112 (ffmpeg+0x0000013b3709)
  
  [..]
  
    Previous write of size 4 at 0x7dbc0000e614 by thread T2 (mutexes : write M1917) :
  
      #0 build_def_list src/libavcodec/h264_refs.c:91 (ffmpeg+0x0000013b46cf)
  

  • [DH] libavcodec/h264_picture.c