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• 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 ?

  


• ffmpeg : convert a video by using another video's settings

  11 janvier 2015, par orcaman

  I have an mp4 file containing an H.264 video. This video has particular settings that I am not sure about, but I want to reproduce them on other videos that I encode (those other videos are already H.264 encoded, but they have different properties - bitrate, size, etc.)

  I know that ffprobe can be used to extract some information from the original video, and I guess that using this information I could try to reproduce the conversion settings required for use with other videos.

  Question is : do I have to do this manually, in the sense that I need to map the output of ffprobe to ffmpeg flags ? Is there a better way to do this, to make sure I don’t miss anything ?

• convert m3u8 to mp4 and simultaneously downloadable using http protocol

  12 juin 2020, par akshaybhuradia

  I want to convert m3u8 to mp4 and i would like to do conversion as well as download on same time. for download i have used http protocol of ffmpeg.

  



  I am running this command

  



  ffmpeg -i ultra.m3u8 -c copy -listen 1 -seekable 1 -f mp4 http://0.0.0.0:8080/test.mp4

  



  when i trigger this url("http://0.0.0.0:8080/test.mp4"), then file start's download, but i am not able to play video.

  



  and i get error when all chunks are read:

    [hls @ 0x55da053b4100] Opening 'ultra177.ts' for reading
    [tcp @ 0x55da0540f940] Connection to tcp://0.0.0.0:8080 failed: Connection refused
    [tcp @ 0x55da05520480] Connection to tcp://0.0.0.0:8080 failed: Connection refused
    [tcp @ 0x55da053ca780] Connection to tcp://0.0.0.0:8080 failed: Connection refused
    [tcp @ 0x55da05485f80] Connection to tcp://0.0.0.0:8080 failed: Connection refused
    [tcp @ 0x55da053ced40] Connection to tcp://0.0.0.0:8080 failed: Connection refused
    [tcp @ 0x55da054255c0] Connection to tcp://0.0.0.0:8080 failed: Connection refused
    [tcp @ 0x55da0540f940] Connection to tcp://0.0.0.0:8080 failed: Connection refused
    [tcp @ 0x55da05435380] Connection to tcp://0.0.0.0:8080 failed: Connection refused

frame=53236 fps=7939 q=-1.0 Lsize=  476447kB time=00:29:36.30 bitrate=2197.3kbits/s speed= 265x
video:446847kB audio:28278kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.278083%