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• Gaps in audio when pushing rtsp stream to rtmp with ffmpeg

  13 avril 2020, par user13300863

  I push the stream like so :

  



  % ffmpeg -rtsp_transport tcp -i "rtsp://**********************" -codec copy -f flv rtmp://x.rtmp.youtube.com/live2/****************

ffmpeg version N-94664-g0821bc4eee Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 9.1.1 (GCC) 20190807
  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. 33.100 / 56. 33.100
  libavcodec     58. 55.101 / 58. 55.101
  libavformat    58. 31.104 / 58. 31.104
  libavdevice    58.  9.100 / 58.  9.100
  libavfilter     7. 58.101 /  7. 58.101
  libswscale      5.  6.100 /  5.  6.100
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
Input #0, rtsp, from 'rtsp:*************************':
  Metadata:
    title           : Media Server
  Duration: N/A, start: 0.040000, bitrate: N/A
    Stream #0:0: Video: h264 (Main), yuvj420p(pc, bt709, progressive), 1280x720, 12 fps, 25 tbr, 90k tbn, 24 tbc
    Stream #0:1: Audio: aac (LC), 32000 Hz, mono, fltp
Output #0, flv, to 'rtmp://x.rtmp.youtube.com/live2/********************':
  Metadata:
    title           : Media Server
    encoder         : Lavf58.31.104
    Stream #0:0: Video: h264 (Main) ([7][0][0][0] / 0x0007), yuvj420p(pc, bt709, progressive), 1280x720, q=2-31, 12 fps, 25 tbr, 1k tbn, 90k tbc
    Stream #0:1: Audio: aac (LC) ([10][0][0][0] / 0x000A), 32000 Hz, mono, fltp
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
[flv @ 000000000310d540] Non-monotonous DTS in output stream 0:0; previous: 557, current: 120; changing to 557. This may result in incorrect timestamps in the output file.
[flv @ 000000000310d540] Non-monotonous DTS in output stream 0:0; previous: 557, current: 200; changing to 557. This may result in incorrect timestamps in the output file.
[flv @ 000000000310d540] Non-monotonous DTS in output stream 0:0; previous: 557, current: 320; changing to 557. This may result in incorrect timestamps in the output file.
[flv @ 000000000310d540] Non-monotonous DTS in output stream 0:0; previous: 557, current: 400; changing to 557. This may result in incorrect timestamps in the output file.
[flv @ 000000000310d540] Non-monotonous DTS in output stream 0:0; previous: 557, current: 480; changing to 557. This may result in incorrect timestamps in the output file.
frame=    7 fps=0.0 q=-1.0 size=      74kB time=00:00:00.56 bitrate=1079.1kbits/s speed=1.06x    
frame=   25 fps= 19 q=-1.0 size=     188kB time=00:00:02.08 bitrate= 741.5kbits/s speed=1.61x    
frame=   49 fps= 22 q=-1.0 size=     330kB time=00:00:04.08 bitrate= 661.9kbits/s speed=1.83x    
frame=   67 fps= 25 q=-1.0 size=     392kB time=00:00:05.66 bitrate= 567.3kbits/s speed=2.07x    
frame=   72 fps= 22 q=-1.0 size=     410kB time=00:00:06.06 bitrate= 553.9kbits/s speed=1.84x    
frame=   76 fps= 20 q=-1.0 size=     488kB time=00:00:06.38 bitrate= 626.5kbits/s speed=1.67x    
frame=   86 fps= 20 q=-1.0 size=     519kB time=00:00:07.26 bitrate= 585.5kbits/s speed=1.68x    
frame=   92 fps= 19 q=-1.0 size=     538kB time=00:00:07.74 bitrate= 569.5kbits/s speed= 1.6x    
frame=   97 fps= 17 q=-1.0 size=     618kB time=00:00:08.11 bitrate= 623.8kbits/s speed=1.45x    
frame=  108 fps= 18 q=-1.0 size=     658kB time=00:00:09.02 bitrate= 597.6kbits/s speed=1.48x    
frame=  114 fps= 17 q=-1.0 size=     679kB time=00:00:09.50 bitrate= 585.3kbits/s speed=1.44x    
frame=  120 fps= 17 q=-1.0 size=     698kB time=00:00:10.02 bitrate= 570.5kbits/s speed=1.41x    
frame=  121 fps= 16 q=-1.0 size=     764kB time=00:00:10.09 bitrate= 619.8kbits/s speed=1.32x    
frame=  132 fps= 16 q=-1.0 size=     802kB time=00:00:11.01 bitrate= 596.7kbits/s speed=1.35x    
frame=  138 fps= 16 q=-1.0 size=     820kB time=00:00:11.57 bitrate= 580.6kbits/s speed=1.34x    
frame=  144 fps= 16 q=-1.0 size=     841kB time=00:00:12.05 bitrate= 571.5kbits/s speed=1.32x    
frame=  149 fps= 15 q=-1.0 size=     923kB time=00:00:12.45 bitrate= 606.8kbits/s speed=1.29x    
frame=  157 fps= 15 q=-1.0 size=     949kB time=00:00:13.13 bitrate= 592.0kbits/s speed=1.28x    
frame=  163 fps= 15 q=-1.0 size=     969kB time=00:00:13.65 bitrate= 581.3kbits/s speed=1.27x    
frame=  169 fps= 15 q=-1.0 size=    1051kB time=00:00:14.09 bitrate= 610.9kbits/s speed=1.22x    
frame=  180 fps= 15 q=-1.0 size=    1091kB time=00:00:15.05 bitrate= 593.6kbits/s speed=1.24x    
frame=  187 fps= 15 q=-1.0 size=    1113kB time=00:00:15.61 bitrate= 583.8kbits/s speed=1.23x    
frame=  192 fps= 15 q=-1.0 size=    1130kB time=00:00:16.05 bitrate= 576.7kbits/s speed=1.21x    
frame=  197 fps= 14 q=-1.0 size=    1212kB time=00:00:16.45 bitrate= 603.2kbits/s speed= 1.2x    
frame=  206 fps= 14 q=-1.0 size=    1241kB time=00:00:17.17 bitrate= 592.1kbits/s speed= 1.2x    
frame=  213 fps= 14 q=-1.0 size=    1265kB time=00:00:17.77 bitrate= 582.8kbits/s speed= 1.2x    
frame=  217 fps= 14 q=-1.0 size=    1340kB time=00:00:18.09 bitrate= 606.6kbits/s speed=1.16x    
frame=  228 fps= 14 q=-1.0 size=    1380kB time=00:00:19.05 bitrate= 593.4kbits/s speed=1.18x    
frame=  234 fps= 14 q=-1.0 size=    1399kB time=00:00:19.57 bitrate= 585.6kbits/s speed=1.17x    
frame=  240 fps= 14 q=-1.0 size=    1418kB time=00:00:20.05 bitrate= 579.4kbits/s speed=1.16x    
[flv @ 000000000310d540] Failed to update header with correct duration.
[flv @ 000000000310d540] Failed to update header with correct filesize.
frame=  241 fps= 14 q=-1.0 Lsize=    1486kB time=00:00:20.05 bitrate= 606.8kbits/s speed=1.14x    
video:1317kB audio:153kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.058846%
Exiting normally, received signal 2.



  



  When viewed on youtube the stream audio is distorted i.e. it has regular 7ms gaps between each 32ms sound portions.

  



  However, when I save the input stream to a file the audio is fine.
I've experimented with different input/output options for ffmpeg including transcoding the audio stream but nothing helped fix the issue. I think ffmpeg is the culprit here, since VLC or other streaming services like angelcam etc can play the rtsp stream without any distortions.

  


• Stream n number of files to n number of Streams

  13 août 2020, par Tahir

  I am relatively new to ffmpeg. I have streamed single file to multiple servers and can stream multiple files to one server. Now, I want to create a server where I have video files (say 50) and want to stream them all at a time with some specific addresses. Scenario is like, 50 files streaming at the same time to 50 devices running VLC, all files are identical in size but are actually different.
Like :

  


  input-1
input-2
input-3
..
..
input-n

  


  streams like :

  


  stream-1
stream-2
stream-3
..
..
stream-n

  


  All files are pre-encoded and I don't want to encode them on the go. Just take files from a directory and stream them.

  


• v4l2loopback device detected by Chrome, not seen by Zoom or Firefox

  14 novembre 2020, par uri sh.

  I am trying to create a loopback device from my webcam to be accessible from both Zoom and a browser. I created three v4l2loopback devices :

  


  sudo modprobe v4l2loopback devices=3 video_nr=10,11,12 card_label="Loopback_1","Loopback_2","Virtual_cam" exclusive_caps=1,1,0


  


  followed by :

  


  ffmpeg -i /dev/video0 -f v4l2 -vcodec rawvideo -pix_fmt yuv420p /dev/video10 -f v4l2 /dev/video11


  


  Both devices are detected by Chrome, yet not seen by either Zoom nor Firefox.
Following advice on other questions on stackoverflow I tried setting the device properties using v4l2loopback-ctl, using v4l2loopback-ctl set-caps "video/x-raw,format=UYVY,width=640,height=480" /dev/video10, and got in response :

  


  


  Setting pipeline to PAUSED ...
ERROR : Pipeline doesn't want to pause.
ERROR : from element /GstPipeline:pipeline0/GstV4l2Sink:v4l2sink0 : Device '/dev/video10' is not a output device.
Additional debug info :
v4l2_calls.c(636) : gst_v4l2_open () : /GstPipeline:pipeline0/GstV4l2Sink:v4l2sink0 :
Capabilities : 0x85208000
Setting pipeline to NULL ...
Freeing pipeline ...
output to /dev/video10 failed

  


  


  I also tried using gst-launch-1.0 :

  


  gst-launch-1.0 v4l2src device=/dev/video0 ! v4l2sink device=/dev/video10


  


  which tells me that /dev/video10 is not an output device :

  


  


  Setting pipeline to PAUSED ...
ERROR : Pipeline doesn't want to pause.
ERROR : from element /GstPipeline:pipeline0/GstV4l2Sink:v4l2sink0 : Device '/dev/video10' is not a output device.
Additional debug info :
v4l2_calls.c(636) : gst_v4l2_open () : /GstPipeline:pipeline0/GstV4l2Sink:v4l2sink0 :
Capabilities : 0x85208000
Setting pipeline to NULL ...
Freeing pipeline ...

  


  


  I am running Xubuntu 20.04, kernel version 5.4.0-52-generic, with v4l2loopback-dkms v.0.12.3-1ubuntu0.1, and v4l2loopback-utils.

  


  My goal here is to get a device to be consumed by a desktop Node.js server which will open up a web app using xdg-open (thus the need for both Chrome AND Firefox), which will output a processed videostream that could be consumed by a video chat app, such as Zoom or Jitsi.

  


  Any help will be greatly appreciated.