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• How to cut video and add overlay at the same time ?

  15 mai 2017, par Chris

  I am currently cutting a video and after it is cut I am adding an layer of text like this :

  $cut_video_cmd = 'ffmpeg -i "'.$video_path.'" -vf scale=640:-1 -ss 30 -t 10 "'.$video_path.'"';
  
  
  
  $add_text_to_video_cmd = 'ffmpeg -i "'.$video_path.'" -vf drawtext="fontfile='.public_path('assets/fonts/Roboto-Regular.ttf').': \
  
      text=\'Stack Overflow\': fontcolor=white: fontsize=24: box=1: boxcolor=black@0.5: \
  
      boxborderw=5: x=(w-text_w)/2: y=(h-text_h)/2" -codec:a copy "'.$video_path.'.overlay.mp4"';

  It works great, but I am wondering if there is a way to combine these two commands ? Or any way to simplify this process ? I am failing to figure this out.

  Thanks a lot for any help !

• Sample accurate audio slicing in ffmpeg ?

  10 février 2017, par Chris Coniglio

  I need to slice an audio file in .wav format into 10 second chunks.
  These chunks need to be exactly 10 seconds, not 10.04799988232 seconds.

  the current code I am using is

  ffmpeg -i test.wav -ss 0 -to 10 -c:a libfdk_aac -b:a 80k aac/test.aac
  
  
  
  ffmpeg version 3.2.2 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with Apple LLVM version 8.0.0 (clang-800.0.42.1)
  
    configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-opencl --disable-lzma --enable-nonfree --enable-vda
  
    libavutil      55. 34.100 / 55. 34.100
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.100 / 57. 56.100
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  Guessed Channel Layout for Input Stream #0.0 : stereo
  
  Input #0, wav, from '/Users/chris/Repos/mithc/client/assets/audio/wav/test.wav':
  
    Duration: 00:04:37.62, bitrate: 2307 kb/s
  
      Stream #0:0: Audio: pcm_s24le ([1][0][0][0] / 0x0001), 48000 Hz, stereo, s32 (24 bit), 2304 kb/s
  
  Output #0, adts, to '/Users/chris/Repos/mithc/client/assets/audio/aac/test.aac':
  
    Metadata:
  
      encoder         : Lavf57.56.100
  
      Stream #0:0: Audio: aac (libfdk_aac), 48000 Hz, stereo, s16, 80 kb/s
  
      Metadata:
  
        encoder         : Lavc57.64.101 libfdk_aac
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (pcm_s24le (native) -> aac (libfdk_aac))
  
  Press [q] to stop, [?] for help
  
  size=     148kB time=00:00:15.01 bitrate=  80.6kbits/s speed=40.9x    
  
  video:0kB audio:148kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.000000%

  This code does not produce exact slices, any ideas how can this be accomplished ?

• How to use ffmpeg to record audio from a video for first 10seconds in Python

  2 novembre 2022, par S Andrew

  I have rtsp stream coming from a camera which also has audio. My goal is to save the audio. To do this, I have below code :

  


  import ffmpeg&#xA;ffmpeg.input("rtsp://john:<pwd>@192.168.10.111:5545/Streaming/Channels/291/").output("test.wav", map="0:a:0").run&#xA;</pwd>

  


  When I terminate the python script, it saves the test.wav file which has just the audio from the rtsp stream. Now I am trying to save the first 10sec from the stream into 1 file and then the next 10sec in another file and then it keeps on goining untill terminated.

  


  To do this, I have thought of putting the ffmpeg stream in a seprate thread and to schedule that thread to run every 10 sec. This way a new stream will create which will save the audio for 10sec and will exit, and then this keeps on going. But to achieve this, I need to know how can we just save the intial 10 sec from the stream. Please help thanks.