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• How to segment a video file (using FFMPEG) to "encoded" version (i.e., .mp4 is downloaded from one our CDN servers) in which each chunk must be 4MB ?

  13 janvier 2019, par Danyal Zia

  I am using FFMPEG command-line/terminal tool. I have a video in .mp4 format. I am well educated on the segmentation of videos in terms of length/duration, however, I want to segment the chunks of the "encoded/transcoded" version of the video (which I downloaded from our CDN in.mp4) to 4MB (4000000 Bytes), except the last one, which will vary in size (i.e., to encode/decode the video fully). If I am having trouble explaining what I am seeking, then just know I have no interest in segmenting the video in terms of duration/length, as this is irrelevant for me.

  To explain the scenario : I have two copies of the same video. The one is "original" and the second video is the one that I downloaded from the server/CDN. The second video turns out to be corrupted (despite the fact that the video is downloaded successfully, and has the same length/duration) ; it stops playing around 1:12 minutes, even though the seeker/slider keeps progressing until somewhere around 1:45 minutes where the video and audio start to work again.

  I have done the binary comparison (using "fc" in CMD) of these two videos, and they are not the same at all.

  In a nutshell : I think I need to "encode" the corrupted .mp4 video, and then segment the encoded data to multiple versions of 4MB. I don’t know how can I do it from FFMPEG.

  If anything isn’t clear, then ask as many questions you want.

  Thank you for reading !

  Edit : The following seems to work, however, not all the chunks are equivalent to 4MB. What is a something I am doing the wrong way ?

  ffmpeg -i "original.mp4" -b:v 1000000 -g 60 -hls_time 2 -hls
_list_size 0 -hls_segment_size 4000000 output.m3u8

• What is the algorithm to achieve audio decoding in C through ffmpeg ? [on hold]

  16 août 2018, par user8371461

  I want to decode the MP3 audio file, I want to know the algorithm in terms of C language API’s. I have gone through dranger tutorials. But the API’s they used are deprecated now. Could anyone tell me what are the API’s I need to follow one by one ?

• Audio equalizer using FFmpeg

  28 septembre 2015, par Evgeniy Kharchenko

  I’m developing audio player using FFmpeg. I want to add audio equaliqer to my app, but I don’t know how to do it. I know that FFmpeg has a FFT functions, but I have count of samples that not mutch with any power of 2. I also tried to use other FFT libraries, but I have some noise on my audio after equalization.
  Can anybody help me to understand how to use FFmpeg’s FFT functions or any oter ways to implement audio-eq using FFmpeg ?