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• how to compile FFMPEG and merge it to one android ".so" file

  5 avril 2016, par user965347

  i am intereseted to compile the ffmpeg source to android to be invoked with jni as one ".so" last time i tried 0.8 versions but failed it always shows that something is undeclared, i tried all of google examples but it seems doesnt work for me,
  i tried this one

  Link One

  but it seems that the ffmpeg.c is not included with compile , but when i compile it always error, it says that something undeclared, and i cant build this project as one android ".so" file

  i also tried this one,
  Link Two

  but it seems i cant understand.

  i have tried everything , but none of them work ,none of them merge all ".o" , ".so" , ".a" into one ".so" files

  is there any good example in google or somewhere to compile ffmpeg as one ".so" file and have a good downloadable source i can compile ?

• ffmpeg, stereo + 5.1 surround, and YouTube's "Recommended upload encoding settings"

  31 juillet 2021, par CoreyVidal

  I'm trying to make sense of something YouTube has listed on their recommended upload encoding settings for the best possible quality. Here's the link : https://support.google.com/youtube/answer/1722171#zippy=%2Caudio-codec-aac-lc

  


  Specifically this line :

  


  


  

  • Channels : Stereo or Stereo + 5.1

  


  


  


  I'm Googling for "Stereo + 5.1" and anything to do with ffmpeg but I can't seem to find much of anything.

  


  I have trailers with surround audio I need to export for a client for YouTube.

  


• How to output mp4 after concatenation using ffmpeg

  27 août 2019, par Patrick

  I want to merge a couple of mp4 videos (with different fps, heigth, width and bitrate).

  I tried this with a few videos, but it always hides or skips some video files from the input.txt.

  How can I correctly merge those mp4 files ?

  Thank you !

  My command :

  ffmpeg, "-f", "concat", "-i", "concatfile.txt", "-c:v", "copy", "-sn", "-y", "merged_video.mp4", "-max_muxing_queue_size", "1024"

  -> the video does not play correctly

  EDIT :
  i now output the information of each video in concat.txt_

  INPUT1:
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 0000028cdd7c3d00] Auto-inserting h264_mp4toannexb bitstream filter
  
  
  
  Input #0, concat, from 'concatfile.txt':
  
  
  
    Duration: N/A, start: 0.000000, bitrate: 535 kb/s
  
  
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 435 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc
  
  
  
      Metadata:
  
  
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 05/10/2019.
  
  
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 100 kb/s
  
  
  
      Metadata:
  
  
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 05/10/2019.
  
  
  
  INPUT2:
  
  mov,mp4,m4a,3gp,3g2,mj2 @ 00000256592b3d00] Auto-inserting h264_mp4toannexb bitstream filter
  
  
  
  Input #0, concat, from 'concatfile.txt':
  
  
  
    Duration: N/A, start: 0.000000, bitrate: 620 kb/s
  
  
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 522 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc
  
  
  
      Metadata:
  
  
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 10/31/2018.
  
  
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 97 kb/s
  
  
  
      Metadata:
  
  
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 10/31/2018.
  
  
  
  
  
  INPUT3:
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 000001a774cd3d00] Auto-inserting h264_mp4toannexb bitstream filter
  
  
  
  Input #0, concat, from 'concatfile.txt':
  
  
  
    Duration: N/A, start: 0.000000, bitrate: 609 kb/s
  
  
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 513 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc
  
  
  
      Metadata:
  
  
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 10/31/2018.
  
  
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 96 kb/s
  
  
  
      Metadata:
  
  
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 10/31/2018.
  
  
  
  
  
  INPUT4:
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 00000165b1013c80] Auto-inserting h264_mp4toannexb bitstream filter
  
  
  
  Input #0, concat, from 'concatfile.txt':
  
  
  
    Duration: N/A, start: 0.000000, bitrate: 510 kb/s
  
  
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 415 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc
  
  
  
      Metadata:
  
  
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 10/31/2018.
  
  
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 95 kb/s
  
  
  
      Metadata:
  
  
  
        handler_name    : ISO Media file produced by Google Inc. Created on: 10/31/2018.
  
  
  
  INPUT5:
  
  [mov,mp4,m4a,3gp,3g2,mj2 @ 000001c545493c80] Auto-inserting h264_mp4toannexb bitstream filter
  
  
  
  Input #0, concat, from 'concatfile.txt':
  
  
  
    Duration: N/A, start: -0.042667, bitrate: 2972 kb/s
  
  
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 900x600 [SAR 1:1 DAR 3:2], 2862 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc
  
  
  
      Metadata:
  
  
  
        handler_name    : VideoHandler
  
  
  
      Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 24000 Hz, mono, fltp, 110 kb/s
  
  
  
      Metadata:
  
  
  
        handler_name    : SoundHandler

  Could be the issue, that the last mp4 has mono audio ?