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• FFMPEG convert MTS to MP4 without losing metadata ?

  19 octobre 2019, par user9375050

  I’ve tried using ffmpeg to convert an MTS file to an MP4 file, with the -map_metadata 0 option. I’ve also tried suggestions to write the metadata to a file and then read from the file. Neither seem to work. EXifTool certainly shows the tags are there in the original file, but not the converted file. I’m mainly interested in the Date / Time Original tag. I’m at a loss as to what I’m doing wrong. Any ideas ?

• Optimizing Adaptive Streaming with FFMPEG

  25 octobre 2018, par Ramesh Navi

  I am working on a video on demand website, I am using laravel 5.7, FFMPEG and DASH player from (dashif.org). Got some questions.

  Extracting audio like :

  ffmpeg -i original.mp4 -vn -acodec libvorbis -ab 128k -dash 1 my_audio.webm

  Converting video like :

  ffmpeg -i original.mp4 -c:v libvpx-vp9 -keyint_min 150 \
  
  -g 150 -tile-columns 4 -frame-parallel 1  -f webm -dash 1 \
  
  -an -vf scale=160:190 -b:v 250k -dash 1 video_160x90_250k.webm \
  
  -an -vf scale=320:180 -b:v 500k -dash 1 video_320x180_500k.webm \
  
  -an -vf scale=640:360 -b:v 750k -dash 1 video_640x360_750k.webm \
  
  -an -vf scale=1280:720 -b:v 1500k -dash 1 video_1280x720_1500k.webm

  Creating manifest like :

  ffmpeg \
  
  -f webm_dash_manifest -i video_160x90_250k.webm \
  
  -f webm_dash_manifest -i video_320x180_500k.webm \
  
  -f webm_dash_manifest -i video_640x360_750k.webm \
  
  -f webm_dash_manifest -i video_1280x720_1500k.webm \
  
  -f webm_dash_manifest -i my_audio.webm \
  
  -c copy \
  
  -map 0 -map 1 -map 2 -map 3 -map 4 \
  
  -f webm_dash_manifest \
  
  -adaptation_sets "id=0,streams=0,1,2,3 id=1,streams=4" \
  
  my_video_manifest.mpd

  Now the problems :

  1. Video conversion takes a lot of time on the latest i5 8gb
     think-pad running Ubuntu 18. 4minute mp4 took more than 30minute. 10minute, 720p MP4 took forever, had to kill the process. Is
     that normal ? Any idea to optimize ?
  2. Need to find out original
     video’s dimension so that I can avoid dimension conversion more than
     the original. ffprob looks fine in command but produces too much of
     information than required, is there any simple function ?
  3. Converted webm file is bigger in size than original mp4, original
     mp4 of 720p was 33MB, but 640p webm is 76MB. Is that normal or
     something wrong ?

  Any suggestions to optimize the process are welcome.

• drawtext video transition is not smooth

  7 juin 2020, par Sterpu Mihai

  Edit : it seems that youtube displays the 00:05 transition smoothly ; however, my local VLC doesn't so I think this must be a VLC issue of some kind.

  



  Take a look at this video : https://youtu.be/47JJnrH_LyM

  



  It's created from a bigger video and it's composed of 3 parts :

  



  part 1: 00:00 - 00:05 original.mp4
part 2: 00:05 - 00:10 original_with_caption.mp4
part 3: 00:10 - 00:15 original.mp4


  



  The caption snippet was created using the following command :

  



  ffmpeg -ss 00:05 -t 5 -i original.MP4 -vf drawtext="fontfile=C\\:/Windows/Fonts/arial.ttf:fontsize=100:fontcolor=white:x=(w-text_w)/2:y=(h-th-100):text='some random text here'" original_with_caption.MP4


  



  The cuts from the original video were made with the following commands :

  



  ffmpeg -y -i D:\temp\0706\caption\original.MP4 -ss 0 -t 5 -c copy D:\temp\0706\caption\ws\original_split_0_5.MP4
ffmpeg -y -i D:\temp\0706\caption\original.MP4 -ss 10 -t 5 -c copy D:\temp\0706\caption\ws\original_split_10_15.MP4


  



  Finally, all 3 have been merged together by creating a concat.txt file containing the following :

  



  file D:\\temp\\0706\\caption\\ws\\original_split_0_5.MP4
file D:\\temp\\0706\\caption\\original_with_caption.MP4
file D:\\temp\\0706\\caption\\ws\\original_split_10_15.MP4


  



  and then executing the command :

  



  ffmpeg -f concat -safe 0 -i D:\temp\0706\caption\ws\concat.txt -c copy D:\temp\0706\caption\ws\output.MP4


  



  The problem I'm facing is that the transition from 00:05 is not smooth whereas the one from 00:10 is.
What do I need to adapt so the transition is smooth ?