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• Scripting FFmpeg to move text in y co-ordinate by some delta at specific time-codes

  27 février 2019, par distro.obs

  I’m using the basic drawtext command like this

  ffmpeg -i output.mp4 -vf \
  
  'drawtext=textfile='textfile.txt':x=0:y=0 \
  
  :fontsize=30:fontcolor=white:borderw=3 \
  
  :bordercolor=black:box=0' output.mp4"

  which puts stationary text at location (x, y) = (0,0)

  What I want to do is move this text by 10 points in y plane at certain time codes.

  at 00:00:10, y would be 0
  
  at 00:00:11, y would be 10
  
  at 00:00:43, y would be 20
  
  ...
  
  ...
  
  at 00:10:44, y would be 30

  so the ’y’ co-ordinate has a fix increment of 10 at ’keytimes’

  Is there a way to do that ?

• ffmpeg watermark without background [closed]

  22 décembre 2022, par Edwin Pitters

  I have a problem, I am trying to add a watermark to my videos with ffmpeg using a gtx 1060 graphics card, the process works well and very fast, the problem is that the watermark appears with a black background , the image has no background, it is transparent, the problem happens only when I use the nvidia graphics card, because if I do the process with my processor the watermark is placed correctly as expected, so I am sure it is a problem in my configuration when running ffmpeg

  


  Here I leave the command that I am using :

  


  .\ffmpeg.exe -y -hide_banner -init_hw_device cuda=cuda -filter_hw_device cuda -hwaccel cuda -hwaccel_output_format cuda -i test.mp4 -i watermark.png -filter_complex "[1:v]colorchannelmixer=aa=0.3,scale=iw*0.6:-1,format=nv12,hwupload[img];[0:v][img]overlay_cuda=x='if(lt(mod(t\,16)\,8)\,W-w-W*10/100\,W*10/100)':y='if(lt(mod(t+4\,16)\,8)\,H-h-H*5/100\,H*5/100)'[out]" -map [out] -c:v h264_nvenc -b:v 6M -an -preset fast out_overlay.mp4


  


  If I use my processor with the following command, the guide mark without background is added, that is, as expected

  


  for %%a in ("*.m*") do ffmpeg -y -hide_banner -threads 4 -i "%%a" -preset ultrafast -vcodec libx264 -b:v 4000k -minrate 4000k -maxrate 4000k -bufsize 4000k -c:a aac -b:a 64k -pass 1 -f mp4 NUL && ffmpeg -y -hide_banner -threads 8 -i "%%a" -i watermark.png -preset ultrafast -vcodec libx264 -b:v 4000k -minrate 4000k -maxrate 4000k -bufsize 4000k -filter_complex "[1]colorchannelmixer=aa=0.3,scale=iw*0.8:-1[a];[0][a]overlay=x='if(lt(mod(t\,8)\,4)\,W-w-W*10/100\,W*10/100)':y='if(lt(mod(t+2\,8)\,4)\,H-h-H*10/100\,H*10/100)'" -c:a copy -tune film -movflags +faststart -pass 2 "watermark/%%a"
pause


  


  I also tried changing colorchannelmixer=aa=0.3 for lut=a=val*0.3 but it seems that this command is not having any effect

  


  I find that the image is well reviewed to discard, in fact I tried with other images also with a transparent background and I have the same result, a watermark but with a black background

  


• ffmpeg underutilizes cpu on AWS EC2 instance [closed]

  20 décembre 2024, par Denis

  i'm running video encoding with ffmpeg on EC2 instance (c5.xlarge - 4 vcpus)

  


    ffmpeg \
    -i "$INPUT_URL" \
    -c:v libvpx-vp9 -b:v 1M -threads 4 \
    -tile-columns 1 -frame-parallel 1 \
    -row-mt 1 \
    -cpu-used 0 \
    -quality 1 \
    -speed 3 \
    -r 6 \
    -f segment -segment_time "$SEGMENT_DURATION" -reset_timestamps 1 \
    "$OUTPUT_DIR/$OUTPUT_FILE_PREFIX$(date +%s)%03d.webm" > ffmpeg.log 2>&1 &


  


  I expected the CPU utilization to be around 390%, but I observed it to be around 170% via top

  


  why and what i'm doing wrong ?