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• Concatenate DASH audio and video to single file

  18 mars 2019, par Andreas

  First of all, I have a folder with about 200 video and audio segments (m4v and m4a) of a video that was live streamed as DASH video. Now - without having the original file - I want to concatenate those parts to a single, playable video file.

  To mention what I already tested :

  • concatenate via the Unix terminal command cat ; unfortunately this won’t help to make the video playable in any media player again
  • using ffmpeg’s merge abilities via files.txt ; with the same unsuccessful result

  I’m definitely not an expert (otherwise I probably wouldn’t ask) but the problem may be also the missing mpd and/or init file (as far as I could skim in the standard).

  Don’t get me wrong : I don’t want to get a bit to bit identical result of the original file. All I want to achieve is a single playable mp4 file of aforesaid video.

  I also tried to make a own mpd file, but the "stream" won’t play. FYI, I tried playing it in the current VLC 3.0.0 git, since the current stable versions seems not to support DASH.
  If it helps, here the video codec :

  id="live-hd_H264"
  
  mimeType="video/mp4"
  
  codecs="avc1.4d401f"
  
  width="396"
  
  height="704"

  So, can anybody help me ?

  Kind regards !

• Concatenate DASH audio and video to single file

  13 mars 2017, par Andreas

  First of all, I have a folder with about 200 video and audio segments (m4v and m4a) of a video that was live streamed as DASH video. Now - without having the original file - I want to concatenate those parts to a single, playable video file.

  To mention what I already tested :

  • concatenate via the Unix terminal command cat ; unfortunately this won’t help to make the video playable in any media player again
  • using ffmpeg’s merge abilities via files.txt ; with the same unsuccessful result

  I’m definitely not an expert (otherwise I probably wouldn’t ask) but the problem may be also the missing mpd and/or init file (as far as I could skim in the standard).

  Don’t get me wrong : I don’t want to get a bit to bit identical result of the original file. All I want to achieve is a single playable mp4 file of aforesaid video.

  I also tried to make a own mpd file, but the "stream" won’t play. FYI, I tried playing it in the current VLC 3.0.0 git, since the current stable versions seems not to support DASH.
  If it helps, here the video codec :

  id="live-hd_H264"
  
  mimeType="video/mp4"
  
  codecs="avc1.4d401f"
  
  width="396"
  
  height="704"

  So, can anybody help me ?

  Kind regards !

• 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