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• Custom text and background color in subtitles FFMPEG | Converting HEX to AARRGGBB

  3 octobre 2023, par Youssef

  I have this code that was working fine with text color only but when I added the background using outline to draw box around subtitles it started outputing weird colors, for example using black #000 I got red

  


   var alpha = 1.0;

  const textColorHex = "#000000";
  const textColor = `&H${tinycolor(textColorHex).setAlpha(alpha).toHex8().substr(2)}`;
  // textColor : &H0000ff

  const bgColorHex = '#ffffff';
  const bgColor = `&H${tinycolor(bgColorHex).setAlpha(alpha).toHex8().substr(2)}`;
  // bgColor : &Hffffff


  const ffmpeg = spawn("ffmpeg", [
    "-i",
    "test.mp4",
    "-vf",
    `subtitles=${subtitlePath}:force_style='Alignment=${alignment},OutlineColour=${bgColor},BorderStyle=3,PrimaryColour=${textColor},Fontsize=${fontSize}'`,
    "-c:a",
    "copy",
    "-progress", "pipe:1",
    outputPath,
  ]);


  


  I am not sure how to fix that

  


• How to encode an mp4 to the exact specs of another mp4 with FFMPEG

  15 décembre 2021, par BCooper

  I'm working on a batch file to concatenate 3 files together, as follows :

  


  1_Intro_Bumper.mp4,
2_Session.mp4,
3_Outro_Bumper.mp4


  


  I've run into problems with the session.mp4 having slightly different specs, causing the concat to have weird problems with speed/sync/etc, and found out that if I encode the Bumpers through Handbrake to the exact specs of the Session, then the concat works great.

  


  My question is : Can I bypass Handbrake here and include a line in my batch file to encode the Intro and Outro Bumpers to the exact specs of the Session ?

  


  Here's my current batch file :

  


  :: Create File List

for %%i in (*.mp4) do echo file '%%i'>> mylist.txt

:: Concatenate Files

ffmpeg -f concat -safe 0 -i mylist.txt -c copy output.mp4

:: Encode to x264

ffmpeg -i output.mp4 output_x264.mp4


  


  Thanks !

  


• FFmpeg 1.0 causing audio playback issues

  7 novembre 2013, par Jona

  I have an audio streamer based on ffplay. It works great using ffmpeg 0.11 but when I use ffmpeg 1.0 or the latest 1.2 release the audio seems to be decoded or played weirdly.

  Essentially it sounds like chipmunks with mp3 streams and with aac streams I hear tons of static barely hearing the actual stream and the actual stream sounds slow.

  Any ideas the possible changes in ffmpeg that could have caused these types of issues ?

  Similar issue was posted here but no actual answer about what is going on. Supposedly this code reproduces the same issue.

  UPDATE 1 :
  I have done a step by step copy from ffplay and still no luck ! :/ The channel and sampling rate look correct so there must be something internally that is returning a weird decoded format ?