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• FFmpeg : how to stream multiple http outputs

  25 octobre 2022, par Caner Demir

  I'm assigned to search for a solution to stream more than one http output in ffmpeg. I tried the code below which uses pipe, but only the last output works, other ones don't work. The solutions I tried with tee muxer also couldn't work. Any idea how can I do that ?

  


  ffmpeg -re -i sample1.mp3 -i sample2.mp3 -filter_complex amix=inputs=2 -f mp3 pipe:1 | ffmpeg -f mp3 -re -i pipe:0 -c copy -listen 1 -f mp3 http://127.0.0.1:4000 -c copy -listen 1 -f mp3 http://127.0.0.1:4010


  


  The code I tried with tee muxer is below :

  


  ffmpeg -re -i sample1.mp3 -i sample2.mp3 -filter_complex amix=inputs=2 -c:a mp3 -f tee "[listen=1:f=mp3]http://127.0.0.1:4000|[listen=1:f=mp3]http://127.0.0.1:4010"


  


  edit : shared the log with code.

  


  ffmpeg -loglevel debug -hide_banner -re -i sample1.mp3 -filter_complex asplit=2 -c:a mp3 -listen 1 -f mp3 http://127.0.0.1:4000 -c:a mp3 -listen 1 -f mp3 http://127.0.0.1:4010
Splitting the commandline.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
Reading option '-hide_banner' ... matched as option 'hide_banner' (do not show program banner) with argument '1'.
Reading option '-re' ... matched as option 're' (read input at native frame rate; equivalent to -readrate 1) with argument '1'.
Reading option '-i' ... matched as input url with argument 'sample1.mp3'.
Reading option '-filter_complex' ... matched as option 'filter_complex' (create a complex filtergraph) with argument 'asplit=2'.
Reading option '-c:a' ... matched as option 'c' (codec name) with argument 'mp3'.
Reading option '-listen' ... matched as AVOption 'listen' with argument '1'.
Reading option '-f' ... matched as option 'f' (force format) with argument 'mp3'.
Reading option 'http://127.0.0.1:4000' ... matched as output url.
Reading option '-c:a' ... matched as option 'c' (codec name) with argument 'mp3'.
Reading option '-listen' ... matched as AVOption 'listen' with argument '1'.
Reading option '-f' ... matched as option 'f' (force format) with argument 'mp3'.
Reading option 'http://127.0.0.1:4010' ... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option loglevel (set logging level) with argument debug.
Applying option hide_banner (do not show program banner) with argument 1.
Applying option filter_complex (create a complex filtergraph) with argument asplit=2.
Successfully parsed a group of options.
Parsing a group of options: input url sample1.mp3.
Applying option re (read input at native frame rate; equivalent to -readrate 1) with argument 1.
Successfully parsed a group of options.
Opening an input file: sample1.mp3.
[NULL @ 00000216ab345b80] Opening 'sample1.mp3' for reading
[file @ 00000216ab346180] Setting default whitelist 'file,crypto,data'
[mp3 @ 00000216ab345b80] Format mp3 probed with size=4096 and score=51
id3v2 ver:4 flags:00 len:134
[mp3 @ 00000216ab345b80] pad 576 576
[mp3 @ 00000216ab345b80] Skipping 0 bytes of junk at 561.
[mp3 @ 00000216ab345b80] Before avformat_find_stream_info() pos: 561 bytes read:32768 seeks:0 nb_streams:1
[mp3 @ 00000216ab345b80] demuxer injecting skip 1105 / discard 0
[mp3float @ 00000216ab34f3c0] skip 1105 / discard 0 samples due to side data
[mp3float @ 00000216ab34f3c0] skip 1105/1152 samples
[mp3 @ 00000216ab345b80] All info found
[mp3 @ 00000216ab345b80] After avformat_find_stream_info() pos: 22065 bytes read:32768 seeks:0 frames:50
Input #0, mp3, from 'sample1.mp3':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2mp41
    encoder         : Lavf58.45.100
  Duration: 00:12:58.48, start: 0.025057, bitrate: 128 kb/s
  Stream #0:0, 50, 1/14112000: Audio: mp3, 44100 Hz, stereo, fltp, 128 kb/s
    Metadata:
      encoder         : Lavc58.91
Successfully opened the file.
[Parsed_asplit_0 @ 00000216ab34fc80] Setting 'outputs' to value '2'
Parsing a group of options: output url http://127.0.0.1:4000.
Applying option c:a (codec name) with argument mp3.
Applying option f (force format) with argument mp3.
Successfully parsed a group of options.
Opening an output file: http://127.0.0.1:4000.
Matched encoder 'libmp3lame' for codec 'mp3'.
    Last message repeated 1 times
[http @ 00000216ab44d980] Setting default whitelist 'http,https,tls,rtp,tcp,udp,crypto,httpproxy,data'


  


• FFMPEG hangs when trying to receive rtp/udp stream

  22 décembre 2016, par NathanK

  I am trying to receive a udp stream encoded as h264. The exact command I am using is :

  ffmpeg -v 9 -loglevel 99 -re -i "udp://239.192.1.2:1234" outfile.h264

  The output I receive is :

  ffmpeg version 3.2.2-1 Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 6.2.1 (Debian 6.2.1-5) 20161124
  
  
  
  
  
  configuration: --prefix=/usr --extra-version=1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libebur128 --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libiec61883 --enable-libopencv --enable-frei0r --enable-libx264 --enable-chromaprint --enable-shared
  
    libavutil      55. 34.100 / 55. 34.100
  
    libavcodec     57. 64.101 / 57. 64.101
  
    libavformat    57. 56.100 / 57. 56.100
  
    libavdevice    57.  1.100 / 57.  1.100
  
    libavfilter     6. 65.100 /  6. 65.100
  
    libavresample   3.  1.  0 /  3.  1.  0
  
    libswscale      4.  2.100 /  4.  2.100
  
    libswresample   2.  3.100 /  2.  3.100
  
    libpostproc    54.  1.100 / 54.  1.100
  
  Splitting the commandline.
  
  Reading option '-v' ... matched as option 'v' (set logging level) with argument '9'.
  
  Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument '99'.
  
  Reading option '-re' ... matched as option 're' (read input at native frame rate) with argument '1'.
  
  Reading option '-i' ... matched as input url with argument 'udp://@239.192.1.2:1234'.
  
  Reading option 'outffff.h264' ... matched as output url.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option v (set logging level) with argument 9.
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input url udp://@239.192.1.2:1234.
  
  Applying option re (read input at native frame rate) with argument 1.
  
  Successfully parsed a group of options.
  
  Opening an input file: udp://@239.192.1.2:1234.
  
  [udp @ 0x7f6638a36280] No default whitelist set
  
  [udp @ 0x7f6638a36280] end receive buffer size reported is 131072
  
  [AVIOContext @ 0x7f6638a56840] Statistics: 0 bytes read, 0 seeks

  The problem with this is, obviously, that the ffmpeg process isn’t detecting any incoming packets on that address which causes the process to hang.
  I am, however, able to receive the stream using vlc, so I know that the packets are arriving. Here is a link to a similar problem.

  I thought, perhaps, it was a problem with reverse path filtering (as is mentioned in the link), but rp_filter is not set in /etc/sysctl.conf. I’m not quite sure what to do from here, any help is appreciated.

  Edit : I removed the @, however this changes nothing.

  The vlc command that works is :

  vlc --miface eth1 rtp://@239.192.1.2:1234

• FFMPEG mosaic/side-by-side-compositing from simultaneous DirectShow input devices

  9 juin 2013, par timlukins

  This is what I'm trying to do :

  ffmpeg.exe -y \
  
  -f dshow -i video="Microsoft LifeCam Cinema" \
  
  -f dshow -i video="Microsoft LifeCam VX-2000" \
  
  -filter_complex "[0:v]pad=iw*2:ih:0[left];[left][1:v]overlay=W/2.0[fileout]" \
  
  -map "[fileout]" -vcodec libx264 -f flv out.flv

  Basically, I have 2 webcams and I would like to combine them into a single video file in which the frames are 2x1 in size with the frame from one camera in the left and the other on the right.

  In other words, what might be termed "mosaic-ing" or "side-by-side compositing". This is not concatenation - i.e. one file after the other (so not using the concat filter).

  I've gleamed that this use of -filter_complex to pad and then position the frames appears the prescribed way. Indeed, when I test this with files like so :

  ffmpeg.exe -y -i test1.flv -i test2.flv -filter_complex "[0:v]pad=iw*2:ih:0[left];[left][1:v]overlay=W/2.0[fileout]" -map "[fileout]" -vcodec libx264 -f flv testout.flv

  It works fine !

  With the "live" version however, both cameras seem to start (their lights come on) but the capture stalls.

  (Suspiciously like there is some DirectShow deadlock on the separate input device threads...)

  And so, I wonder is there some way to overcome this and force the two input stream's data to merge ?

  I have also tried the extended format of the dshow filter option like so as well :

  -f dshow -i video="Microsoft LifeCam Cinema":video="Microsoft LifeCam VX-2000"

  But only one camera is then selected (I suspect this option is really only to enable separate video and audio streams to be combined).

  I've also tried explicitly setting each input device to have the exact same frame size and rate with -f dshow -video_size 640x480 -framerate 30. No joy though. It still stalls once the camera is listed.

  Here is the tail end of the output (with -v debug on) :

  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option y (overwrite output files) with argument 1.
  
  Applying option v (set libav* logging level) with argument debug.
  
  Applying option filter_complex (create a complex filtergraph) with argument [0:v]pad=iw*2:ih:0[left];[left][1:v]overlay=W/2.0[fileout].
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input file video=Microsoft LifeCam Cinema.
  
  Applying option f (force format) with argument dshow.
  
  Successfully parsed a group of options.
  
  Opening an input file: video=Microsoft LifeCam Cinema.
  
  [dshow @ 00000000016e79a0] All info found
  
  [dshow @ 00000000016e79a0] Estimating duration from bitrate, this may be inaccurate
  
  Input #0, dshow, from 'video=Microsoft LifeCam Cinema':
  
    Duration: N/A, start: 1130406.072000, bitrate: N/A
  
      Stream #0:0, 1, 1/10000000: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 333333/10000000, 30 tbr, 10000k tbn, 30 tbc
  
  Successfully opened the file.
  
  Parsing a group of options: input file video=Microsoft LifeCam VX-2000.
  
  Applying option f (force format) with argument dshow.
  
  Successfully parsed a group of options.
  
  Opening an input file: video=Microsoft LifeCam VX-2000.
  
  [dshow @ 00000000016e79a0] real-time buffer 101% full! frame dropped!

  EDIT Further details trying to fix within the code...*

  I've always understood from past Windows DirectShow work that multiple calls to CoInitialize() on the same thread is bad. See here. Perhaps I've misunderstood how FFMPEG is multi-threaded (i.e. if each input device is on it's own thread) but I thought to just try regulating the call with a guard variable (a static int com_init = 0; - this should probably be mutex-ed...).

  e.g. in libavdevice/dshow.c method dshow_read_header

  889    if (com_init==0)
  
  890     CoInitialize(0);
  
  891    com_init++

  And similar for dshow_read_close

  170    com_init--;
  
  171    if (com_init==0)
  
  172     CoUninitialize()

  Sadly, this doesn't work. The first camera starts but the second doesn't and the error is :

  [dshow @ 0000000000301760] Could not set video options
  
  video=Microsoft LifeCam VX-2000: Input/output error

  (Worth a shot. Looks like each input device is indeed on the same thread...)