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• After video convert to hls with ffmpeg, new video has no screen and has just audio

  27 octobre 2023, par Sevada Grigoryan

  I am having problems with HLS stream creation, sometimes my created video just has audio and it's display a black screen
Here is my code in below

  


  /opt/nodejs/ffmpeg -i "https://******-v1-post-content.s3.us-east-
2.amazonaws.com/104/posts/win/video/item-1615842876280.mov" -codec: copy -start_number 0 -hls_time 10 -hls_list_size 0 -f hls /tmp/item-1615842876280.m3u8


  


  The Output Of command

  


  stderr: ffmpeg version 4.2.3-static https://johnvansickle.com/ffmpeg/  Copyright (c) 2000-2020 the FFmpeg developers
  built with gcc 8 (Debian 8.3.0-6)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'https://*****-v1-post-content.s3.us-east-2.amazonaws.com/104/posts/win/video/item-1615842876280.mov:
  Metadata:
    major_brand     : qt  
    minor_version   : 0
    compatible_brands: qt  
    creation_time   : 2021-03-13T08:49:02.000000Z
  Duration: 00:00:03.50, start: 0.000000, bitrate: 7984 kb/s
    Stream #0:0(und): Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, bt709), 1920x1080, 7881 kb/s, 29.97 fps, 29.97 tbr, 600 tbn, 600 tbc (default)
    Metadata:
      rotate          : 90
      creation_time   : 2021-03-13T08:49:02.000000Z
      handler_name    : Core Media Video
      encoder         : HEVC
    Side data:
      displaymatrix: rotation of -90.00 degrees
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 83 kb/s (default)
    Metadata:
      creation_time   : 2021-03-13T08:49:02.000000Z
      handler_name    : Core Media Audio
[hls @ 0x6684ec0] Opening '/tmp/item-16158428762800.ts' for writing
Output #0, hls, to '/tmp/item-1615842876280.m3u8':
  Metadata:
    major_brand     : qt  
    minor_version   : 0
    compatible_brands: qt  
    encoder         : Lavf58.29.100
    Stream #0:0(und): Video: hevc (Main) (hvc1 / 0x31637668), yuv420p(tv, bt709), 1920x1080, q=2-31, 7881 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 600 tbc (default)
    Metadata:
      rotate          : 90
      creation_time   : 2021-03-13T08:49:02.000000Z
      handler_name    : Core Media Video
      encoder         : HEVC
    Side data:
      displaymatrix: rotation of -90.00 degrees
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 83 kb/s (default)
    Metadata:
      creation_time   : 2021-03-13T08:49:02.000000Z
      handler_name    : Core Media Audio
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)


  


  Thank you !

  


  Sevada

  


• Add another audio over a file with mixed audio tracks in ffmpeg

  11 mars 2021, par Real Noob

  I have a file that was formed by concatenating three different files : a.mp4, b.mp4 and c.mp4.

  


  do ffmpeg -f concat -i "concat-file.txt" -map 0:v -map 0:a -c:v libx264 -crf 23 -fflags +genpts joined-file.mp4"


  


  After that I run this command, mentioned here : How to add a new audio (not mixing) into a video using ffmpeg ?

  


  ffmpeg -i joined-file.mp4 -i audio.mp3 -filter_complex "[0:a][1:a]amerge=inputs=2[a]" -map 0:v -map "[a]" -c:v copy -ac 2 -shortest output.mp4


  


  What is causing this issue ?

  


  Thanks. :)

  


  UPDATE :

  


  Here are the commands that I have been running :

  


  ffmpeg -i "middle/b.mp4" -c:v copy -video_track_timescale 30k -c:a aac -ac 6 -ar 44100 -shortest "wrap/b.mp4"
ffmpeg -f concat -i "concat-file.txt" -map 0:v -map 0:a -c:v libx264 -crf 23 -fflags +genpts "joined/abc.mp4"
ffmpeg -i "joined/abc.mp4" -i audio.mp3 -filter_complex "[0:a:0][1:a:0]amerge=inputs=2[a]" -map 0:v -map "[a]" -c:v copy -ac 2 -shortest "final/abc-cmplt.mp4"


  


  Here is the "concat-file.txt" :

  


  file 'bits/a.mp4'
file 'wrap/b.mp4'
file 'bits/c.mp4'


  


  All the video files a.mp4, b.mp4 and c.mp4 have their original audio. After I run the commands above, the joint video abc-cmplt.mp4 has combined audio (audio.mp3 plus their own) for the first (a.mp4) and last parts (c.mp4). However, the middle part only has its own audio and the extra audio I am trying to add does not seem to merge with the audio of b.mp4 in the final joint file.

  


  Output of ffmpeg -i bits/a.mp4 -i wrap/b.mp4 -i bits/c.mp4 :

  


  ffmpeg version 4.2.2 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 9.2.1 (GCC) 20200122
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'bits/a.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    creation_time   : 2021-03-10T08:50:04.000000Z
  Duration: 00:00:01.05, start: 0.000000, bitrate: 1846 kb/s
    Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1080x1920 [SAR 1:1 DAR 9:16], 1462 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
    Metadata:
      creation_time   : 2021-03-10T08:50:04.000000Z
      handler_name    : ?Mainconcept Video Media Handler
      encoder         : AVC Coding
    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
    Metadata:
      creation_time   : 2021-03-10T08:50:04.000000Z
      handler_name    : #Mainconcept MP4 Sound Media Handler
Input #1, mov,mp4,m4a,3gp,3g2,mj2, from 'wrap/b.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.29.100
  Duration: 00:00:27.93, start: 0.000000, bitrate: 234 kb/s
    Stream #1:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1080x1920, 231 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
    Metadata:
      handler_name    : VideoHandler
Input #2, mov,mp4,m4a,3gp,3g2,mj2, from 'bits/c.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    creation_time   : 2021-03-10T08:42:52.000000Z
  Duration: 00:00:01.05, start: 0.000000, bitrate: 1829 kb/s
    Stream #2:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 1080x1920 [SAR 1:1 DAR 9:16], 1320 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
    Metadata:
      creation_time   : 2021-03-10T08:42:52.000000Z
      handler_name    : ?Mainconcept Video Media Handler
      encoder         : AVC Coding
    Stream #2:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
    Metadata:
      creation_time   : 2021-03-10T08:42:52.000000Z
      handler_name    : #Mainconcept MP4 Sound Media Handler


  


• How to record audio and video on macos with ffmpeg ?

  5 janvier 2024, par chovy

  $ ffmpeg -f avfoundation -list_devices true -i ""
...
[AVFoundation indev @ 0x7fa8c24312c0] AVFoundation video devices:
[AVFoundation indev @ 0x7fa8c24312c0] [0] FaceTime HD Camera
[AVFoundation indev @ 0x7fa8c24312c0] [1] Capture screen 0
[AVFoundation indev @ 0x7fa8c24312c0] AVFoundation audio devices:
[AVFoundation indev @ 0x7fa8c24312c0] [0] MacBook Pro Microphone


  


  These are my audio and video devices.
I'm trying to record audio from mic and video capture of screen.
However when I try to run the command I get this error :

  


  $ ffmpeg -f avfoundation -i "1:0"  \             
  ~/Videos/screencast.mp4
ffmpeg version 4.3.2 Copyright (c) 2000-2021 the FFmpeg developers
  built with Apple clang version 12.0.0 (clang-1200.0.32.29)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/4.3.2 --enable-shared --enable-pthreads --enable-version3 --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
[AVFoundation indev @ 0x7fced1c315c0] Configuration of video device failed, falling back to default.
[avfoundation @ 0x7fced2009000] Selected pixel format (yuv420p) is not supported by the input device.
[avfoundation @ 0x7fced2009000] Supported pixel formats:
[avfoundation @ 0x7fced2009000]   uyvy422
[avfoundation @ 0x7fced2009000]   yuyv422
[avfoundation @ 0x7fced2009000]   nv12
[avfoundation @ 0x7fced2009000]   0rgb
[avfoundation @ 0x7fced2009000]   bgr0
[avfoundation @ 0x7fced2009000] Overriding selected pixel format to use uyvy422 instead.


  


  Additionally I'd like to capture camera in lower right. This is how I do it on Linux, but the basics don't even work on MacOS.

  


  screencap() {
  file=`date +%Y-%m-%d-%H.%M.%S`
  ffmpeg -f alsa -i pulse -f x11grab -thread_queue_size 64 -i :0.0 \
  -video_size 384x216 -i /dev/video0 \
        -filter_complex 'overlay=main_w-overlay_w:main_h-overlay_h' \
  -r 60 -preset ultrafast ~/Videos/screencast-${file}.mp4
}