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• How to create a 720x480 blank mpg

  6 août 2019, par wckai

  In order to join some video clip(720x480 [SAR 8:9 DAR 4:3]) and leave two seconds blank gap between each one, i try to make an blank clip by code

  ffmpeg -t 2 -s 720x480 -f rawvideo -pix_fmt rgb24 -r 29.97 -i /dev/zero -f lavfi -i anullsrc -shortest empty_720x480.mpg

  but when i try to concat clips,

  -filter_complex "[0:v:0]setsar=8/9[v0];[1:v:0][1:a:0][v0][0:a:0][2:v:0][2:a:0][v0][0:a:0][3:v:0][3:a:0]concat=n=5:v=1:a=1[outv][outa]"

  an error occurs

  Input link in3:v0 parameters (size 720x480, SAR 1:1) do not match the corresponding output link in0:v0 parameters (720x480, SAR 8:9)

  I have try create an 720x540 first and scale to 720x480(), but still not the same with 720x480 [SAR 200:219 DAR 100:73].

  I have no idel how to solve it, please help.

• 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.

• How do I make sure FFmpeg generates the correct duration ?

  14 juillet 2019, par Wang

  For example, the following command creates a three-second video.

  ffmpeg -f lavfi -i color=c=red:r=30:d=3:size=800x600 red.nut

  But ffprobe shows the duration is N/A :

  [STREAM]
  
  index=0
  
  codec_name=mpeg4
  
  codec_long_name=MPEG-4 part 2
  
  profile=Simple Profile
  
  codec_type=video
  
  codec_time_base=0/1
  
  codec_tag_string=FMP4
  
  codec_tag=0x34504d46
  
  width=800
  
  height=600
  
  coded_width=800
  
  coded_height=600
  
  has_b_frames=0
  
  sample_aspect_ratio=1:1
  
  display_aspect_ratio=4:3
  
  pix_fmt=yuv420p
  
  level=1
  
  color_range=unknown
  
  color_space=unknown
  
  color_transfer=unknown
  
  color_primaries=unknown
  
  chroma_location=left
  
  field_order=unknown
  
  timecode=N/A
  
  refs=1
  
  quarter_sample=false
  
  divx_packed=false
  
  id=N/A
  
  r_frame_rate=30/1
  
  avg_frame_rate=0/0
  
  time_base=1/61440
  
  start_pts=0
  
  start_time=0.000000
  
  duration_ts=N/A
  
  duration=N/A
  
  bit_rate=N/A
  
  max_bit_rate=N/A
  
  bits_per_raw_sample=N/A
  
  nb_frames=N/A
  
  nb_read_frames=N/A
  
  nb_read_packets=N/A
  
  DISPOSITION:default=0
  
  DISPOSITION:dub=0
  
  DISPOSITION:original=0
  
  DISPOSITION:comment=0
  
  DISPOSITION:lyrics=0
  
  DISPOSITION:karaoke=0
  
  DISPOSITION:forced=0
  
  DISPOSITION:hearing_impaired=0
  
  DISPOSITION:visual_impaired=0
  
  DISPOSITION:clean_effects=0
  
  DISPOSITION:attached_pic=0
  
  DISPOSITION:timed_thumbnails=0
  
  TAG:encoder=Lavc57.107.100 mpeg4
  
  [/STREAM]

  Is there flag I can set to allow FFmpeg to generate the correct duration_ts and duration ?