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• installing ffmpeg on Mac fail

  23 juillet 2022, par wei wang

  I tried to install ffmpeg on Mac(macOS 10.13) with : brew install ffmpeg

  


  but I got below ....

  


  Updating Homebrew...
Warning: You are using macOS 10.13.
We (and Apple) do not provide support for this old version.
You will encounter build failures with some formulae.
Please create pull requests instead of asking for help on Homebrew's GitHub,
Twitter or any other official channels. You are responsible for resolving
any issues you experience while you are running this
old version.

Error: ffmpeg: no bottle available!
You can try to install from source with:
  brew install --build-from-source ffmpeg
Please note building from source is unsupported. You will encounter build
failures with some formulae. If you experience any issues please create pull
requests instead of asking for help on Homebrew's GitHub, Twitter or any other
official channels.


  


• Encode PCM to MPEG-2 AAC with FFmpeg APIs

  13 août 2019, par Tank2006

  My environment is "ffmpeg version 3.4.6-0ubuntu0.18.04.1"

  I wrote a program to encode audio data into MPEG-2 AAC with reference to an official example.

  First, I simply changed the encoder value(and the full source code I wrote is here).

  if (!(output_codec = avcodec_find_encoder(AV_CODEC_ID_AAC))) {

  But FFmpeg S/PDIF encoder(spdifenc.c) returns an error “Wrong AAC file format”.

  I use avctx->profile = FF_PROFILE_MPEG2_AAC_LOW(FF_PROFILE_MPEG2_AAC_HE); but it takes no effects.

  Considering the possibility that the official binary was not compiled with the "CONFIG_ADTS_HEADER" C flag, I ran the following code directly as this :

  buf = output_packet.data;
  
  int err = init_get_bits8(&gb, buf, 7);
  
  if (get_bits(gbc, 12) != 0xfff) return AAC_AC3_PARSE_ERROR_SYNC;

  This didn’t find ADTS header "0xFFF", therefore, an encoder doesn’t seem to work as expected.

  How do I encode ffmpeg-2 aac audio with ffmpeg apis ?

• Handling multiple line subtitles of Right aligned languages(arabic) in Moviepy

  24 décembre 2023, par Stanger Danger

  I am trying to add Arabic subtitles on a video using Moviepy. The issue I'm facing is related to alignment of Arabic text, as it progresses from right to left, instead of left to right in English language.

  


  

  


  As text length gets more and more, Moviepy trims the words from both ends, this issue can be resolved if we break the text into multiple lines. This works well for English language but for Arabic, the first line becomes the last line because of the (Right-Left)alignment.

  


  

  


  The text on Second line should come first on the first line at the start, while end chuck of first text towards the left corner should render on the second line, but it is getting rendered as English language, Left to right alignment.

  


  Here is my code :

  


  def add_subtitles(address_subtitles, address_video):
  video = VideoFileClip(address_video)
  generator = lambda txt: TextClip(txt, font='Arial', fontsize=22, color='black', stroke_width=2, method='caption', align='south', size=video.size)
  subtitles = SubtitlesClip(address_subtitles, generator)
  #print()

  result = CompositeVideoClip([video, subtitles.set_pos(('center','bottom'))])
  result.write_videofile("arabic_with_hardcoded_subtitles_3.mp4", fps=video.fps, temp_audiofile="temp-audio.m4a", remove_temp=True, codec="libx264"
  , audio_codec="aac")