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• 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 ?

• Merge videos and images into a new video in Android [on hold]

  10 septembre 2013, par vijay

  I have to create an android app that is similar to PicPlayPost.

  The app should be able to do the following things :

  • Load images and videos into the corresponding blocks in the frame.

  • Resize the image.

  • Add audio to the block that contains image.

  • Play two or more videos in parallel.

  • Save the whole frame as a video clip.

  I thought of using FFmpeg concatenation for this but it will not play all the videos in parallel.

  I have tried to use FFmpeg with android in my earlier project and ended up with lot of issues when building latest FFmpeg with android NDK.The below link explains the usage of pre-compiled FFmpeg and OpenCV for Android.

  https://code.google.com/p/javacv/#Quick_Start_for_OpenCV_and_FFmpeg

  but i could not find ffmpeg-1.2*.jar there.

  Is there any package to process video and playback in android other than FFmpeg ?

  Thanks.