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• ffmpeg - create blank video file with multichannel audio ?

  23 mars 2020, par BabaG

  i found a couple of threads on stackoverflow that allow me to create a dummy mov file for picture :

  ffmpeg -f lavfi -i color=c=black:s=640x480 -c:v prores_ks -profile:v 3 -tune stillimage -pix_fmt yuv422p10 -t 10 output_proreshq.mov

  the above creates a 10 second, picture-only file.

  this :

  ffmpeg -f lavfi -i anullsrc=channel_layout=5.1:sample_rate=48000 -t 10 output.wav

  creates a 6 channel wav file.

  i haven’t been able to figure out how to combine these two commands to create a file with blank picture and six channels of blank audio. can someone show me how to get this done ? thanks !

• Video created via ffmpeg will not play on iPhone 10 or Huawei Android using Chrome

  17 février 2020, par MHatton

  I have created a video from a image and adding an MP3 file. It plays fine on my Moto G Android phone and on my desktop, but a collegue has said it will not play on his iPhone 10 or Huawei Android phone running Chrome.

  Does the following ffmpeg need an extra command adding to make the created MP4 more compatible across devices ?

  ffmpeg -loop 1 -i 6f4aa5dfefc4dd32186f41315ad9d1e2-0.png -i "download.mp3" -c:v libx264 -tune stillimage -c:a aac -b:a 192k -pix_fmt yuv420p -shortest aw-slide0.mp4

• FFMpeg - Split Window RTMP - Delay on Second Stream

  22 février 2016, par Nick Smit

  I’m trying to combine two live RTMP sources into one split screen output with combined audio. The output is then sent on to a receiving RTMP server.

  Using the following command, which uses the same RTMP input for both feeds, I’ve managed to get the above working, however the input on the left is delayed by about 2 seconds from the one on the right.

  ffmpeg -re -i rtmp://myserver.tld/live/stream_key -re -i rtmp://myserver.tld/live/stream_key \
  
  -filter_complex "\
  
  nullsrc=size=1152x720 [base];\
  
  [0:v] crop=576:720 [upperleft];\
  
  [1:v] crop=576:720 [upperright];\
  
  [base][upperleft] overlay=shortest=1 [tmp1];\
  
  [tmp1][upperright] overlay=shortest=1:x=576;\
  
  [0:a][1:a]amix \
  
  " -c:a libfdk_aac -ar 44100 -threads 32 -c:v libx264 -g 50 -preset ultrafast -tune zerolatency -f flv rtmp://myserver.tld/live/new_stream_key

  Output :

  ffmpeg version N-76137-gb0bb1dc Copyright (c) 2000-2015 the FFmpeg developers
  
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04)
  
  configuration: --prefix=/home/ubuntu/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/ubuntu/ffmpeg_build/include --extra-ldflags=-L/home/ubuntu/ffmpeg_build/lib --bindir=/home/ubuntu/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-nonfree
  
  libavutil      55.  4.100 / 55.  4.100
  
  libavcodec     57.  7.100 / 57.  7.100
  
  libavformat    57.  8.102 / 57.  8.102
  
  libavdevice    57.  0.100 / 57.  0.100
  
  libavfilter     6. 12.100 /  6. 12.100
  
  libswscale      4.  0.100 /  4.  0.100
  
  libswresample   2.  0.100 /  2.  0.100
  
  libpostproc    54.  0.100 / 54.  0.100
  
  [flv @ 0x3a0e940] video stream discovered after head already parsed
  
  Input #0, flv, from 'rtmp://myserver.tld/live/stream_key':
  
  Metadata:
  
  Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
  
  displayWidth    : 1152
  
  displayHeight   : 720
  
  fps             : 29
  
  profile         :
  
  level           :
  
  Duration: 00:00:00.00, start: 5.717000, bitrate: N/A
  
  Stream #0:0: Audio: aac (LC), 48000 Hz, stereo, fltp, 163 kb/s
  
  Stream #0:1: Video: h264 (High), yuv420p, 1152x720, 30.30 fps, 29.97 tbr, 1k tbn, 59.94 tbc
  
  [flv @ 0x3a49e00] video stream discovered after head already parsed
  
  Input #1, flv, from 'rtmp://myserver.tld/live/stream_key':
  
  Metadata:
  
  Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
  
  displayWidth    : 1152
  
  displayHeight   : 720
  
  fps             : 29
  
  profile         :
  
  level           :
  
  Duration: 00:00:00.00, start: 9.685000, bitrate: N/A
  
  Stream #1:0: Audio: aac (LC), 48000 Hz, stereo, fltp, 163 kb/s
  
  Stream #1:1: Video: h264 (High), yuv420p, 1152x720, 30.30 fps, 29.97 tbr, 1k tbn, 59.94 tbc
  
  [libx264 @ 0x3a9cd60] Application has requested 32 threads. Using a thread count greater than 16 is not recommended.
  
  [libx264 @ 0x3a9cd60] using SAR=1/1
  
  [libx264 @ 0x3a9cd60] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
  
  [libx264 @ 0x3a9cd60] profile Constrained Baseline, level 3.1
  
  [libx264 @ 0x3a9cd60] 264 - core 142 r2389 956c8d8 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=11 lookahead_threads=11 sliced_threads=1 slices=11 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=50 keyint_min=5 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
  
  Output #0, flv, to 'rtmp://myserver.tld/live/new_stream_key':
  
  Metadata:
  
  Server          : NGINX RTMP (github.com/arut/nginx-rtmp-module)
  
  displayWidth    : 1152
  
  displayHeight   : 720
  
  fps             : 29
  
  profile         :
  
  level           :
  
  encoder         : Lavf57.8.102
  
  Stream #0:0: Video: h264 (libx264) ([7][0][0][0] / 0x0007), yuv420p, 1152x720 [SAR 1:1 DAR 8:5], q=-1--1, 25 fps, 1k tbn, 25 tbc (default)
  
  Metadata:
  
  encoder         : Lavc57.7.100 libx264
  
  Stream #0:1: Audio: aac (libfdk_aac) ([10][0][0][0] / 0x000A), 44100 Hz, stereo, s16, 128 kb/s (default)
  
  Metadata:
  
  encoder         : Lavc57.7.100 libfdk_aac
  
  Stream mapping:
  
  Stream #0:0 (aac) -> amix:input0
  
  Stream #0:1 (h264) -> crop
  
  Stream #1:0 (aac) -> amix:input1
  
  Stream #1:1 (h264) -> crop
  
  overlay -> Stream #0:0 (libx264)
  
  amix -> Stream #0:1 (libfdk_aac)
  
  Press [q] to stop, [?] for help
  
  [flv @ 0x3a0e940] Thread message queue blocking; consider raising the thread_queue_size option (current value: 512)
  
  frame=   81 fps= 20 q=15.0 size=     674kB time=00:00:03.24 bitrate=1703.3kbits/frame=  102 fps= 22 q=22.0 size=     945kB time=00:00:04.08 bitrate=1896.4kbits/

  Is there any way to force FFMpeg to read both RTMP inputs at the same time ?