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• How to play audio while recording a video and mix both audio and video after completing the recording ?

  2 mai 2018, par Tirupatirao

  I tried ffmpeg and mediamuxer and some others solutions

  But I’m unable to achieve it

  I need feature like dubsmash

  I tried some stack overflow answers even though not done

  I want play audio while recording video and after that output will be the custom audio(what I have played) with video

  Please help us...we are trying since 26 days onwards

  Thanks

• ffmpeg : `ffmpeg -i "/video.mp4" -i "/audio.m4a" -c copy -map 0:v:0 -map 1:a:0 -shortest "/nu.mp4"` truncates, how to loop audio to match videos ? [closed]

  18 avril 2024, par Swudu Susuwu

  This is with "FFmpeg Media Encoder" from Google Store (Linux-based Android OS), but it has all the commands of ffmpeg for normal Linux.

  


  -shortest truncates the video to match the audio, and -longest has the last half of the video not have audio (for videos twice as long as audio,)

  


  what to use to loop audio (to match length of video with this) ?

  


  Video length is 15:02, so used ffmpeg -i "/audio.m4a" -c copy -map 0:a:0 "/audionew.m4a"-t 15:02 -stream_loop -1`, but got errors.

  


• FFMPEG not exporting audio OR exports audio with still video

  7 septembre 2021, par Zak44

  Trying to utilize ffmpeg to convert a mp4 to DNxHD, then wrap it in an MXF. The ultimate goal is to get this into Avid Media Composer. I've been having issues with this particular command, where no audio is ever exported :

  


  ffmpeg -y -r 24 -i Test_fix.mp4 -vcodec dnxhd -vsync drop -b:v 36M -s 1920x1080 -threads 2 -vf colormatrix=bt601:bt709 -c:a aac -f rawvideo BLAH.mov


  


  If I tweak the above command by removing the force of the "rawvideo" option I get audio, however the video then sits on the first frame and never advances :

  


  ffmpeg -y -r 24 -i Test_fix.mp4 -vcodec dnxhd -vsync drop -b:v 36M -s 1920x1080 -threads 2 -vf colormatrix=bt601:bt709 -c:a aac -r 24 BLAH.mov


  


  What exactly am I doing wrong ? Here is the output from running the second time :

  


  ffmpeg -y -r 24 -i Test_fix.mp4 -vcodec dnxhd -vsync drop -b:v 36M -s 1920x1080 -threads 2 -vf colormatrix=bt601:bt709 -c:a aac -r 24 BLAH.mov
ffmpeg version 4.4 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/4.4_2 --enable-shared --enable-pthreads --enable-version3 --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-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-avresample --enable-videotoolbox
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Test_fix.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    creation_time   : 2021-07-01T17:19:54.000000Z
  Duration: 00:01:05.75, start: 0.000000, bitrate: 6336 kb/s
  Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 960x540 [SAR 1:1 DAR 16:9], 6016 kb/s, 24 fps, 24 tbr, 24k tbn, 48 tbc (default)
    Metadata:
      creation_time   : 2021-07-01T17:19:54.000000Z
      handler_name    : ?Mainconcept Video Media Handler
      vendor_id       : [0][0][0][0]
      encoder         : AVC Coding
  Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 317 kb/s (default)
    Metadata:
      creation_time   : 2021-07-01T17:19:54.000000Z
      handler_name    : #Mainconcept MP4 Sound Media Handler
      vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> dnxhd (native))
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help
Output #0, mov, to 'BLAH.mov':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    encoder         : Lavf58.76.100
  Stream #0:0(eng): Video: dnxhd (DNXHD) (AVdn / 0x6E645641), yuv422p(tv, bt709/unknown/unknown, progressive), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 36000 kb/s, 24 fps, 12288 tbn (default)
    Metadata:
      creation_time   : 2021-07-01T17:19:54.000000Z
      handler_name    : ?Mainconcept Video Media Handler
      vendor_id       : [0][0][0][0]
      encoder         : Lavc58.134.100 dnxhd
  Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      creation_time   : 2021-07-01T17:19:54.000000Z
      handler_name    : #Mainconcept MP4 Sound Media Handler
      vendor_id       : [0][0][0][0]
      encoder         : Lavc58.134.100 aac
[mov @ 0x7fd129013000] Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
[mov @ 0x7fd129013000] Encoder did not produce proper pts, making some up.
frame= 1577 fps=133 q=1.0 Lsize=  290993kB time=00:01:05.70 bitrate=36279.7kbits/s speed=5.54x
video:290168kB audio:809kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.005816%
[aac @ 0x7fd129019000] Qavg: 22541.643