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• How to record video, audio and compress the same video using ffmpeg, so that both the task can be done in a single command line

  19 juillet 2019, par sachinkumar adahalli

  I am newly using "ffmpeg". I have compressed the video which is stored in the directory, then I got to know that we can do "compression and recording" both at a time using ffmpeg. I tried this by using the below command but that is not working unable to record as well. Anyone please help me out to solve. Thanks in advance.

  I tried using this command "ffmpeg -f gdigrab -framerate 10 -i desktop out.mpeg" this is giving error like- "Unknown input format : ’gdigrab’ ".

  I want the result which should "compress the live recording video" and store it in a folder or db.

• Text Watermarking on video without any loss of video and audio quality using FFmpeg

  7 janvier 2021, par Aditya Kumar

  I am using following command to add text watermark on a video file(for mp4, mpg,m4v,flv,mov etc..) :

  


  


  ffmpeg -i input.mp4 -vf "drawtext=text='Opentext':x=(w-text_w)/2:y=(h-text_h)/2:fontsize=24:fontcolor=white" TextOutput.mp4

  


  


  For some of the file transformation the property of video file changes. for example- When I tried to add text watermark on a mkv file I got this message :

  


  


  [matroska @ 0000001867d36ec0] Non-monotonous DTS in output stream 0:1 ;
previous : 2273, current : 1596 ; changing to 2273. This may result in
incorrect timestamps in the output file.

  


  


  So, I want to preserve the quality of video after adding the text watermark. How can I do that ?

  


• 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.