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• ffmpeg I have 4 .png images on an alpha video the images do not appear ?

  29 novembre 2022, par mod N

  png images on an alpha video the images do not appear ? on the alpha zone if I remove "colorchannelmixer=aa=0.01" it appears on the video
if you want i can send you the video
if a nice person could help me i'm a taker

  


  ffmpeg/ffmpeg
  
-i agence_montage_video/6382315603f21_test_neutreb_VF.mp4
  
-i agence_quatre_img/"1669476945.png"
  
-i agence_quatre_img/"1669476908.png"
  
-i agence_quatre_img/"1669476891.png"
  
-i agence_quatre_img/"1669476831.png"
  
-filter_complex
  
"[1:v]format=rgba,scale=1080:1080,colorchannelmixer=aa=0.01 [logo] ;
  
[2:v]format=rgba,scale=1080:1080,colorchannelmixer=aa=0.01 [logo2] ;
  
[3:v]format=rgba,scale=1080:1080 ,colorchannelmixer=aa=0.01[logo3] ;
  
[4:v]format=rgba,scale=1080:1080 ,colorchannelmixer=aa=0.01[logo4] ;
  
[0:v][logo]overlay=(W-w)/2 :(H-h)/2:enable='between(t,0,6)':format=auto,format=yuv420p [f0] ;
  
[f0][logo2]overlay=(W-w)/2 :(H-h)/2:enable='between(t,6,8)':format=auto,format=yuv420p [f1] ;
  
[f1][logo3]overlay=(W-w)/2 :(H-h)/2:enable='between(t,8,10)':format=auto,format=yuv420p [f2] ;
  
[f2][logo4]overlay=(W-w)/2 :(H-h)/2:enable='between(t,10,"13")' [out]"
  
-map "[out]" agence_quatre_img/"19"_.mov

  


  


• Using FFmpeg, How to convert an frame image sequence to video(video codec : dvvideo) ?

  25 mai 2022, par ruping

  I'm working on an image processing project.

  


  The project proceeds as follows :

  


  Input Video -> frame Sequence -> (Processing) -> Output Video

  


  I want to create the output video with the same specifications as the input video.

  


  The specs of the input video we use are :

  


  - Size : 1280x1080, Codec : dvvideo, pixel_fmt : yuv422


  


  But I am struggling with the following error :

  


  Duration: 00:00:03.20, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: png, rgb24(pc), 1280x1080 [SAR 3:2 DAR 16:9], 29.97 fps, 29.97 tbr, 29.97 tbn, 29.97 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (png (native) -> dvvideo (native))
Press [q] to stop, [?] for help
[dvvideo @ 0x55b965b745c0] DVCPRO HD encoding is not supported.
[dvvideo @ 0x55b965451780] ff_frame_thread_encoder_init failed
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed!


  


  The code is below. (subprocess in python)

  


  ffmpeg -y -f image2 -r "{fps}" -i {input_img_root} -s 1280:1080 -b:v {bit_rate}  -vcodec dvvideo -pix_fmt yuv422p "{output}"


  


  (fps and bitrate are taken from the input video. and input_img_root and output are paths.)

  


  I've been trying for several days, but it doesn't work.

  


  If you know any way to make a new video while maintaining the video specifications (Especially dvvideo codec)(not using ffmpeg), it would be nice to share it.

  


• Drawtext and overlay video in one round with FFmpeg

  11 janvier 2019, par Chili

  I have two working solutions (Thanks to the internet and the community !), but I can’t merge them in one pass.

  1st the text :

  How can I determine the position of the text ? The textdraw working nice, encoding the filename to the video, but the positioning doesn’t work, I change the x,y values in vain.

  for i in *.mp4; do ffmpeg -i "$i" \
  
  -c:v libx264 -profile:v main -level:v 3.1 -pix_fmt yuv420p -an \
  
  -filter_complex "[0]split[base][text]; \
  
  [text]drawtext=fontfile=font.ttf: fontsize=50: fontcolor=white: \
  
  shadowcolor=black@0.6: shadowx=4: shadowy=2: \
  
  text='${i%*_v*.*}': \
  
  box=1: boxcolor=a60000@0.4: boxborderw=6: \
  
  x=(w-text_w)/2:y=(h-text_h)/2,format=yuva444p,fade=t=in:st=0:d=1:alpha=1,fade=t=out:st=6:d=1:alpha=1[subtitles]; \
  
  [base][subtitles]overlay" \
  
  -f mp4 -y "${i%.*}.mp4";
  
  done

  ---

  2nd text with overlay. I have one trasnparent overlay video file and try to use it with text file, the order is the next ;

  • On top - the text (from the 1st problem)
  • Between the source and text overlay video
  • Bottom - source video

  If I try to encode overlay with the source video, it working good.

  ffmpeg -i sourcefile.mp4 -i overlayvideo.mov \
  
  -filter_complex "[0:v]setpts=PTS-STARTPTS[v0];[1:v]setpts=PTS-STARTPTS[v1];[v0][v1]overlay=eof_action=pass[out1]" \
  
  -map [out1] \
  
  -f mp4 -y output.mp4

  How can I use it with a previous text command in one pass ? I want to use it in batch script file on macOS.
  Thank you for your ideas and advice.