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• delay in lyrics shown when concat video with lyrics with an intro video using ffmpeg

  19 mars 2018, par no name

  I have a video with lyrics I add the lyrics used ffmpeg too. I have the lyrics in lrc formate and i change it to ass lyrics formate then I start to add it to my video using this command

  ffmpeg -i video.mp4 -vf "ass=out.ass,fade=in:0:30" -y amr.mp4

  I use fade=in:0:30 to make fade in the start of the video so when I start merge intro video my original video not start at once but to have some fade in, in the start to have a good view.
  then I start to add the intro video using a text file which has this

  file intro.mp4
  
  file amr.mp4

  then I merge them using this command

  ffmpeg -f concat -safe 0 -i out.txt -c copy -y final.mp4

  i got these message

  [mov,mp4,m4a,3gp,3g2,mj2 @ 03eadb80] Auto-inserting h264_mp4toannexb bitstream filter
  
  [mp4 @ 06419580] Non-monotonous DTS in output stream 0:1; previous: 310272,     current: 285626; changing to 310273. This may result in incorrect timestamps in   the output file.

  repeated many times.
  when i watch the final video the lyrics have some delay from the sound the problem appeared when I merge the intro video but without it the lyrics have no problem so what I made wrong make the lyrics shown in this way and not in the right timing as it should have no problems as I merge only the intro video and after add the lyrics to the original one
  Thanks in advance

• How to Extract Lyrics (USLT frame) from Mp3 using FFmpeg ?

  1er mai 2022, par Wonderer

  I'm using Mp3tag's "Tools" feature to batch run FFmpeg in Windows, in order to batch extract the embedded lyrics content (USLT frame of ID3v2 tag) from MP3 files, I know with FFmpeg I can do something like :

  


  -i "%_path%" -f ffmetadata "%_folderpath%\%_filename%.txt"


  


  "%_path%" = full path of the MP3 file

  


  "%_folderpath%%_filename%.txt" = path and filename of the exported txt file.

  


  The command above extracts all the metadata from MP3 file and export them into a txt file with the following cotent for example :

  


  ;FFMETADATA1
album=name of the album
artist=name of the artist
title=name of the title
lyrics-eng=[00:01.23]line1 of lyrics
\
[00:04.56]line2 of lyrics
\
[00:07.89]line3 of lyrics
\
[01:03.12]3rd last line of lyrics
\
[02:04.34]2nd last line of lyrics
\
[03:05.67]Last line of lyrics
\

date=2020
encoder=Lavf59.23.100


  


  (the original lyrics uses Simple LRC format with timestamps in each line, certain lines contain only the timestamp with empty lyrics)

  


  (There might (or might not) be additional metadata (e.g. date and encoder in the example above) following the lyrics part)

  


  As seen above, the backslash "\" (which is not present in the original lyrics) is somehow added after each line of lyrics, between CR (CarriageReturn) and LF (LineFeed) as seen in Notepad++ (the original lyrics use CRLF as EOL characters).

  


  So how do I modify the given command line to export only the lyrics part (exluding all other metadata and the extra backslash "\"), an example of the expected text file content is shown below :

  


  [00:01.23]line1 of lyrics
[00:04.56]line2 of lyrics
[00:07.89]line3 of lyrics
[01:03.12]3rd last line of lyrics
[02:04.34]2nd last line of lyrics
[03:05.67]Last line of lyrics


  


  with the original EOL characters from lyrics such as CRLF

  


• ffmpeg AV1 HW decoding using Tiger Lake in Windows 10

  21 avril 2021, par Revolutionary_Tax270

  I'm trying to use ffmpeg and use the HW decoder to decode AV1 bitstreams. I tried using -hwaccel vaapi, or -hwaccel dxva2, or -hwaccel d3d11va, but all of them seems to default to libdav1d decoder. Anyone know how I can test my HW decoding ? I'm interested in getting the decode frame rate.