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• FFmpeg drops HLS frames

  21 juillet 2017, par Vlad

  I’m trying to start ffmpeg

  vlad@s1:~/hls/first$ ffmpeg -re -i http://86.57.225.238:8090 -c:v copy -c:a copy index.m3u8

  But ffmpeg doesn’t start. What is a problem ?

  Input #0, mpegts, from 'http://86.57.225.238:8090':
  
    Duration: N/A, start: 88845.286311, bitrate: N/A
  
    Program 1 
  
      Metadata:
  
        service_name    : Bel_4 Mogilev
  
        service_provider: Bel_4 Mogilev
  
      Stream #0:0[0xc9]: Video: h264 (Main) ([27][0][0][0] / 0x001B), yuv420p, 720x576 [SAR 12:11 DAR 15:11], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
      Stream #0:1[0xca]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 224 kb/s
  
  Output #0, hls, to 'index.m3u8':
  
    Metadata:
  
      encoder         : Lavf56.40.101
  
      Stream #0:0: Video: h264 ([27][0][0][0] / 0x001B), yuv420p, 720x576 [SAR 12:11 DAR 15:11], q=2-31, 25 fps, 25 tbr, 90k tbn, 25 tbc
  
      Stream #0:1: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, 224 kb/s
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (copy)
  
    Stream #0:1 -> #0:1 (copy)
  
  Press [q] to stop, [?] for help
  
  frame=    0 fps=0.0 q=-1.0 size=N/A time=00:00:41.35 bitrate=N/A    

• Most efficient way for ffmpeg to make thumbnails ? [Windows 10]

  26 janvier 2017, par gregm

  I normally use ThumbnailMe to make contact sheets of thumbnails. My default setting is 15 rows x 5 columns, so 75 images, in videos that are anywhere from 45 minutes to around 90 minutes. ThumbnailMe makes a contact sheet of this size virtually instantaneously. A recent requirement to make a LOT of contact sheets for a LOT of videos has me looking at a command line option so I can do these in batches. I’ve tried a couple different ways to make the thumbnails from the command line :

  ffmpeg -ss 300 -i myvideo.avi -vf fps=1/300 %d.jpg

  or

  ffmpeg -i myvideo.avi -vf fps=1/60 %d.jpg

  No matter which of these methods I use it takes roughly a minute to make just 16 screenshots (from there I would use ImageMagick to make the contact sheet). As I said above, ThumbnailMe can make a 15x5 grid of images at the mere press of a button. ThumbnailMe is built on an older command line program, Movie Thumbnailer, which I think used an old version of ffmpeg, or at least the codec libavcodec.

  If these other programs can create thumbnails so quickly why does it take ffmpeg so long to make them for me ? Even if I output the screenshots in a very small size, say 50x50, it still takes 2 secs for each image to be created.

• Can't give metadata of comment to MP3 file using ffmpeg

  21 septembre 2022, par Juco

  I want to covert an AAC audio file to MP3 and add a comment in the metadata of the MP3 file using ffmpeg.
  
The -metadata comment option doesn't work and ffmpeg doesn't return an error.
  

  


  The complete command I'm running is
ffmpeg -i "test.aac" -ab 128k -metadata comment='this is test' "test.mp3"
  

  


  I also tried -metadata description='this is test' and even updated ffmpeg. Other options such as -metadata artist and -metadata album work well.
  

  


  What's wrong with this approach ?

  


  Output
  

  


  Stream mapping:
  Stream #0:0 -> #0:0 (aac (native) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
Output #0, mp3, to 'test.mp3':
  Metadata:
    description     : this is test
    TSSE            : Lavf58.29.100
    Stream #0:0: Audio: mp3 (libmp3lame), 48000 Hz, stereo, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc58.54.100 libmp3lame


  


  Environment
  
ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
  
built with Apple clang version 11.0.3 (clang-1103.0.32.59)