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• How do I use FFMPEG to pipe in a video file and pipe out a converted video file

  11 April 2014, by Ranjit Aneesh

  I have very limited knowledge of FFMPEG.
  My use case is that I have a content server with a http url from where I want to pipe in a video file (The video file can be of any format) and I have to convert them to some other format, sometime changing the resolution, and then pipe out and post the video back to the content server.

  I cannot keep a copy of the video file on the local file system where I run ffmpeg since they can be of large sizes and precious time will get wasted in doing so and then calling ffmpeg for conversion and finally writing back the file to content server. I may have to support both Linux as well as windows

  My question is

  1. Is it possbile for FFMPEG to be able to read a file from an http url
  2. Is it possbile to pipe in this data in some other way to FFMPEG if 1 is not possible
  3. Is it possbile to write the data back to a http location by making a ReST put/post call
  4. If 3 is not possbile is there some other way that ffmpeg can push the data back to the server.

  Thanks

• aac: correctly map 7.1ch-wide AAC from FDK AAC encoder

  4 June 2015, by nu774

  aac: correctly map 7.1ch-wide AAC from FDK AAC encoder
  FDK AAC encoder outputs SCE(front)+CPE(front)+CPE(back)+CPE(back) on
  
  MODE_7_1_REAR_SURROUND configuration.
  
  Since decoder couldn’t properly map 4 back channels, decoding failed
  
  unless -request_channel_layout 0x8000000000000000 has been specified.
  
  Now we treat first CPE(back) as CPE(side) on channel mapping.
  Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
  

  • [DBH] libavcodec/aacdec.c

• How can I extract "GROUP-ID", "LANGUAGE" and "INSTREAM-ID" from ts using ffmpeg

  21 November 2020, by user1163234

  I am trying to get the captions from a segment from a live feed. I am running the command

  


  ffmpeg -i seg-1077853030-v1-a1.ts

  


  Output

  


  `Input #0, mpegts, from 'seg-109853030-v1-a1.ts':
Duration: 00:00:06.01, start: 57867.901133, bitrate: 2649 kb/s
Program 1

  


  Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, progressive), 1280x720 [SAR 1:1 DAR 16:9], Closed Captions, 29.97 fps, 29.97 tbr, 90k tbn, 59.94 tbc
Stream #0:1[0x101]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 98 kb/s
Stream #0:2[0x102]: Data: timed_id3 (ID3  / 0x20334449)`


  


  My question is what command should I run to print out the caption file with the track metadata including label and language.