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• avconv - drawtext - apply filter for given time period

  29 novembre 2015, par user3304297

  I am on Ubuntu 15.10 (wily). I want to add a text to the video for the 1st 30sec. I can add video to the entire length of the video by using the following command

  $ avconv -i input.MTS -metadata title="my video" -vf "drawtext=fontfile=/usr/share/fonts/truetype/ubuntu-font-family/Ubuntu-B.ttf:text='My Text':fontcolor=white@0.8:x=7:y=60:fontsize=36" -strict experimental out.mp4

  With ffmpeg there is an option drawtext=enable=between(t,0,30) but with avconv this is not a valid option.

   $ avconv -i 00054.MTS -metadata title="my video" -vf "drawtext=enable='between(t,0,30)':fontfile=/usr/share/fonts/truetype/ubuntu-font-family/Ubuntu-B.ttf:text='My Text':fontcolor=white@0.8:x=7:y=60:fontsize=36" -strict experimental out.mp4
  
  
  
   drawtext @ 0x18b8d20] No such option: enable.
  
  [AVFilterGraph @ 0x18c3000] Error initializing filter 'drawtext' with args 'enable=between(t,0,30):fontfile=/usr/share/fonts/truetype/ubuntu-font-family/Ubuntu-B.ttf:text=My Text:fontcolor=white@0.8:x=7:y=60:fontsize=36'

  With avconv how can I add a text to the video for a given time period ?

  $ avconv --version
  
  avconv version 11.4-6:11.4-2ubuntu3, Copyright (c) 2000-2014 the Libav developers
  
    built on Aug 11 2015 07:00:13 with gcc 5.2.1 (Ubuntu 5.2.1-15ubuntu1) 20150808

• hwcontext_vulkan : check for non-flagged transfer queue families

  20 novembre 2021, par Lynne

  hwcontext_vulkan : check for non-flagged transfer queue families
  "All commands that are allowed on a queue that supports transfer
  
  operations are also allowed on a queue that supports either
  
  graphics or compute operations. Thus, if the capabilities of a
  
  queue family include VK_QUEUE_GRAPHICS_BIT or VK_QUEUE_COMPUTE_BIT,
  
  then reporting the VK_QUEUE_TRANSFER_BIT capability separately for
  
  that queue family is optional."
  

  • [DH] libavutil/hwcontext_vulkan.c

• FFmpeg - Delay Only Video Stream Of Audio Linked dshow Input

  15 avril 2018, par Nimble

  I’m having a slight issue trying to sync my audio and video up with an acceptable margin of error. Here is my command :

  ffmpeg -y -thread_queue_size 9999 -indexmem 9999 -guess_layout_max 0 -f dshow -video_size 3440x1440 -rtbufsize 2147.48M ^
  
  -framerate 100 -pixel_format nv12 -i video="Video (00 Pro Capture HDMI 4K+)":audio="SPDIF/ADAT (1+2) (RME Fireface UC)" ^
  
  -map 0:0,0:1 -map 0:1 -flags +cgop -force_key_frames expr:gte(t,n_forced*2) -c:v h264_nvenc -preset: llhp -pix_fmt nv12 ^
  
  -b:v 250M -minrate 250M -maxrate 250M -bufsize 250M -c:a aac -ar 44100 -b:a 384k -ac 2 -r 100 -af "aresample=async=250" ^
  
  -vsync 1 -max_muxing_queue_size 9999 -f segment -segment_time 600 -segment_wrap 9 -reset_timestamps 1 ^
  
  C:\Users\djcim\Videos\PC\PC\PC%02d.ts

  My problem is the video comes in slightly ahead of the audio, I can use -itsoffset but then I have to call the video and audio as separate inputs as -itsoffset offsets both audio and video. While this may seem the obvious solution it causes inconsistent audio synchronization if the audio isn’t called with the video. Basically if both audio and video aren’t called at the same time the video can now be ahead or behind with a 2-3 frame margin. When I call them at the same time the video consistently comes in 2 frames ahead of the audio, every time. I just need a way to delay only the video stream without delaying the audio while keeping both audio and video linked from the beginning. I’ve tried this with no luck :

  ffmpeg -y -thread_queue_size 9999 -indexmem 9999 -guess_layout_max 0 -f dshow -video_size 3440x1440 -rtbufsize 2147.48M ^
  
  -framerate 200 -pixel_format nv12 -i video="Video (00 Pro Capture HDMI 4K+)":audio="SPDIF/ADAT (1+2) (RME Fireface UC)" ^
  
  -flags +cgop -force_key_frames expr:gte(t,n_forced*2) -c:v h264_nvenc -preset: llhp -pix_fmt nv12 -b:v 250M ^
  
  -minrate 250M -maxrate 250M -bufsize 250M -c:a aac -ar 44100 -b:a 384k -ac 2 -r 100 ^
  
  -filter_complex "[0:v] setpts=PTS-STARTPTS+.032/TB [v]; [0:a] asetpts=PTS-STARTPTS, aresample=async=250 [a]" -map [v] ^
  
  -map [a] -vsync 1 -max_muxing_queue_size 9999 -f segment -segment_time 600 -segment_wrap 9 -reset_timestamps 1 ^
  
  C:\Users\djcim\Videos\PC\PC\PC%02d.ts

  Just like -itsoffset both video and audio are being delayed. You can delay solely audio with adelay, but there doesn’t seem to be a video delaying equivalent.

  Any help or advice would be greatly appreciated.