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• aac : check the maximum number of channels

  27 avril 2013, par Luca Barbato

  aac : check the maximum number of channels
  Broken bitstreams could report a larger than specified number of
  
  channels and cause outbound writes.
  CC:libav-stable@libav.org
  

  • [DBH] libavcodec/aacdec.c

• Overlaying frame number with ffmpeg [duplicate]

  30 mars 2024, par DMagma

  This should be simple but it is giving me fits and I haven't been able to find this specific problem. I am trying to overlay the frame number on a set of videos but my ffmpeg command string is ignoring any text overlay that has anything to do with a frame number. For example, these produce the correct overlay

  


  "-vf drawtext=fontfile='Arial.ttf': text='TEST': fontsize=30: fontcolor=yellow@1.0:x=(w-text_w-15):y=15" 
"-vf drawtext=fontfile='Arial.ttf': text='%camera%': fontsize=30: fontcolor=yellow@1.0:x=(w-text_w-15):y=15" 
"-vf drawtext=fontfile='Arial.ttf': text='%vname%': fontsize=30: fontcolor=yellow@1.0:x=(w-text_w-15):y=15" 


  


  but these all ignore the "text" input and instead overlay "fontsize=30" or "start_number=1" to the frames

  


  "-vf drawtext=fontfile='Arial.ttf': text=%{n}: fontsize=30: fontcolor=yellow@1.0:x=(w-text_w-15):y=15" 
"-vf drawtext=fontfile='Arial.ttf': text='%{n}': fontsize=30: fontcolor=yellow@1.0:x=(w-text_w-15):y=15" 
"-vf drawtext=fontfile='Arial.ttf': text='Frame %{frame_num}': start_number=1: fontsize=30: fontcolor=yellow@1.0:x=(w-text_w-15):y=15" 


  


  I am at a loss as to why it is not properly identifying or using the frame number.

  


  I have tried multiple variations such as those shown above including swapping the order of the inputs to no effect.

  


• Not able to change the program number for the video

  17 mai 2018, par C.B. Akshay Kumar

  I have been trying to change the program number of a particular .ts file using FFmpeg without any success. I saw the documentation and it mentions to use the -program option. But, I am not able to add the streams as I desire. Here’s the program information for the stream that I possess currently :

  Input #0, mpegts, from 'output_2_without_pgm_num.ts':
  
    Duration: 00:01:49.92, start: 1.400000, bitrate: 1816 kb/s
  
    Program 1
  
      Metadata:
  
    service_name    : Service01
  
    service_provider: FFmpeg
  
  Stream #0:0[0x100]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, progressive), 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
  Stream #0:1[0x101](ger): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, fltp, 384 kb/s (clean effects)
  
  Stream #0:2[0x102](eng): Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, fltp, 384 kb/s (clean effects)
  
  Stream #0:3[0x103](ger): Subtitle: dvb_teletext ([6][0][0][0] / 0x0006)

  Now, I want to change the program number from 1 to 22. Any idea how I could do that ? I have tried using -program option, but I can’t add streams 2 and 3 to the newly created .ts file.

  Thanks in advance !