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• Why doesn't the lame mp3 codec (libmp3lame) create XingHeaders ?

  5 novembre 2012, par user784637

  I downloaded a video from youtube whose audio was encoded in aac and transcoded it to an mp3 using the libmp3lame codec.

  $ ffmpeg -i video.mp4 -vn -acodec libmp3lame -- test.mp3

  Now when I try to write id3 tags to it using the taglib example tagwriter I get the following warning :

  $ ./testwriter -t 'stuff' test.mp3
  
  TagLib: MPEG::XingHeader::parse() -- Xing header doesn't contain the total stream size.

  The id3 tags are written and display correctly, but the lack of the XingHeaders causes older players to loop the song several times.

  Why doesn't the lame mp3 codec create XingHeaders ? How do I create XingHeaders ?

• Batch convert MP3 and static image to AVI with FFMPEG

  8 décembre 2013, par user3027136

  I'm tired of searching for this problem. I have found 2 solutions here, but both work only partially.
  What I want to do is to convert all the MP3 inside a folder (if possible subfolders, too) to avi or anything else accepted by Youtube. I have created 2 .bat that should do this (according to the other threads here). They don't, one of them creates the avi without the image (black) and the other seems to capture the screen.
  Here they are.
  If you know about ffmpeg please point me to the right direction. Thank you.

  This one uses mp3info.exe - to be honest I have no idea what mp3info does, I just guess it finds the lenght of the song to be mathed later with the length of the video.

  @echo off
  
  for %%a in (*.mp3) do (
  
  for /f "delims=" %%b in ('mp3info.exe -p %%S "%%a"') do (
  
  ffmpeg -i "%%a" -loop 1 -r 1 -i "cover.jpg" -acodec copy "%%~na.mp4" -t %%b
  
  )
  
  )

  This seems more simple, runs faster but captures the screenshot and ignores the cover.jpg file.

  @echo off
  
  for %%A IN (*.mp3) DO ffmpeg -i "%%A" -i "cover.jpg" "%%A.mpg"
  
  done

  mp2info.exe, cover.jpeg and the .bat scripts are in the same folder with the .mp3 files.

• ffmpeg - which video rate is correct ?

  7 mai 2014, par mast kalandar

  I am using ubuntu 13.04

  Version of ffmpeg is ffmpeg version N-61041-g52a2138

  Through php, I am calling ffmpeg commands to extract images and do some modification in those images and again merge those images back to video.

  While merging all images through ffmpeg command, I need to pass video bit rates.

  Command is as below

  public function mergeImagesToVideo($frame_no,$user_directory_name,$video_bit_rates,&$output,&$status){
  
          /* merge all of frames to create one second video */
  
  
  
          $user_frames_path=$GLOBALS["all_user_dir_path"].$user_directory_name."/";
  
  
  
          $command= $GLOBALS['ffmpeg'].' -f image2 -r 30 -i '.
  
                    $user_frames_path.'f'.$frame_no.'_%d.png -r 30 -b:v '
  
                    .$video_bit_rates.'k '.$user_frames_path.'f'.$frame_no.'.mp4';
  
  
  
          //echo $command;
  
          exec($command,$output,$status);
  
          return;
  
      }

  The call is made as below

  $this->mergeImagesToVideo($start_second,$user_directory,$video_bit_rates,$output,$status);
  
  
  
                if($status!=0){
  
                  echo "some thing went wrong in merging all images to create a video <br />";
  
                }

  Now When check bit rates through ffmpeg command output is like as below

  ffmpeg -i f1.mp4

  This command shows 7303 kb/s

  

  While I right click the image and show properties, it shows 7295 kbps

  

  Which is the correct one ?? Not getting correct line..

  Thanks in advance.