Tjyylli

I have a streaming system structure running on my iMac:

• 
  MediaParser: A golang program that connects to TCP socket and find media frames. This socket does not contains encoded video, the connection is used to transmit any kind of message. Each detected audio or video frame is passed to their previous created unix socket server(I prefer unix sockets instead of named pipes).


• 
  HLSServer: Another golang program which connects to MediaParser's
  unix sockets, reads the audio and video, transcode them(using a system call to ffmpeg command) and creates a HLS playlist.

The first one program woks fine, but I have problems running ffmpeg from the HLSServer.

When I try to use only one unix socket(audio or video) there is no problem:

ffmpeg -y -nostdin -loglevel repeat+level -thread_queue_size 32768 -f alaw -i unix:./files/L_12345_2_A.sock -acodec aac -f hls -hls_list_size 2 ./files/media/video/l/12345_2.m3u8

ffmpeg -y -nostdin -loglevel repeat+level -thread_queue_size 32768 -f h264 -i unix:./files/L_12345_2_V.sock -vcodec copy -f hls -hls_list_size 2 ./files/media/video/l/12345_2.m3u8

However, when I try to run ffmpeg using both sources, it gets stuck like it's waiting for something on the second input:

ffmpeg -y -nostdin -loglevel repeat+level -thread_queue_size 32768 -f alaw -i unix:./files/L_12345_2_A.sock -f h264 -i unix:./files/L_12345_2_V.sock -vcodec copy -acodec aac -f hls -hls_list_size 2 ./files/media/video/l/12345_2.m3u8

I check the process on the Activity Monitor and no memory or CPU is used and, if I run the command from terminal and send the stop signal, ffmpeg stops immediately.
I also try to invert the inputs order but the result is the same.

Outputs:

Initial output:

ffmpeg -y -nostdin -loglevel repeat+level -thread_queue_size 32768 -f alaw -i unix:./files/L_12345_2_A.sock -f h264 -i unix:./files/L_12345_2_V.sock -vcodec copy -acodec aac -f hls -hls_list_size 2 ./files/media/video/l/12345_2.m3u8

[info] ffmpeg version N-93264-g85051febc6-tessus  https://evermeet.cx/ffmpeg/  Copyright (c) 2000-2019 the FFmpeg developers

[info]   built with Apple LLVM version 10.0.0 (clang-1000.11.45.5)

[info]   configuration: --cc=/usr/bin/clang --prefix=/opt/ffmpeg --extra-version=tessus --enable-avisynth --enable-fontconfig --enable-gpl --enable-libaom --enable-libass --enable-libbluray --enable-libdav1d --enable-libfreetype --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libmysofa --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libzimg --enable-libzmq --enable-libzvbi --enable-version3 --pkg-config-flags=--static --disable-ffplay

[info]   libavutil      56. 26.100 / 56. 26.100

[info]   libavcodec     58. 47.102 / 58. 47.102

[info]   libavformat    58. 26.101 / 58. 26.101

[info]   libavdevice    58.  6.101 / 58.  6.101

[info]   libavfilter     7. 48.100 /  7. 48.100

[info]   libswscale      5.  4.100 /  5.  4.100

[info]   libswresample   3.  4.100 /  3.  4.100

[info]   libpostproc    55.  4.100 / 55.  4.100

[warning] Guessed Channel Layout for Input Stream #0.0 : mono

[info] Input #0, alaw, from 'unix:./files/L_12345_2_A.sock':

[info]   Duration: N/A, bitrate: 352 kb/s

[info]     Stream #0:0: Audio: pcm_alaw, 44100 Hz, mono, s16, 352 kb/s

[h264 @ 0x7fc1a6806c00] [error] non-existing PPS 0 referenced

[h264 @ 0x7fc1a6806c00] [error] decode_slice_header error

[h264 @ 0x7fc1a6806c00] [error] no frame!

After send the stop signal(Ctrl+C):

[h264 @ 0x7fc1a8000000] [info] decoding for stream 0 failed

[h264 @ 0x7fc1a8000000] [warning] Could not find codec parameters for stream 0 (Video: h264, none): unspecified size

Consider increasing the value for the 'analyzeduration' and 'probesize' options

[info] Input #1, h264, from 'unix:./files/L_12345_2_V.sock':

[info]   Duration: N/A, bitrate: N/A

[info]     Stream #1:0: Video: h264, none, 26.08 fps, 25 tbr, 1200k tbn, 50 tbc

[info] Stream mapping:

[info]   Stream #1:0 -> #0:0 (copy)

[info]   Stream #0:0 -> #0:1 (pcm_alaw (native) -> aac (native))

[warning] Finishing stream 0:1 without any data written to it.

[hls @ 0x7fc1a781a400] [info] Opening './files/media/video/l/12345_20.ts' for writing

[info] Output #0, hls, to './files/media/video/l/12345_2.m3u8':

[info]   Metadata:

[info]     encoder         : Lavf58.26.101

[info]     Stream #0:0: Video: h264, none, q=2-31, 26.08 fps, 25 tbr, 90k tbn, 25 tbc

[info]     Stream #0:1: Audio: aac (LC), 44100 Hz, mono, fltp, 69 kb/s

[info]     Metadata:

[info]       encoder         : Lavc58.47.102 aac

[hls @ 0x7fc1a781a400] [info] Opening './files/media/video/l/12345_2.m3u8.tmp' for writing

[info] frame=    0 fps=0.0 q=-1.0 Lsize=N/A time=00:00:00.00 bitrate=N/A speed=   0x    

[info] video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

[aac @ 0x7fc1a781d200] [info] Qavg: nan

[info] Exiting normally, received signal 2.

The output messages:

[h264 @ 0x7fc1a6806c00] [error] non-existing PPS 0 referenced
[h264 @ 0x7fc1a6806c00] [error] decode_slice_header error
[h264 @ 0x7fc1a6806c00] [error] no frame!

Seems to be normal when no key frame is found at command start. After some seconds all works fine. So I think this errors are not part of the stuck problem.

I don't know what could be the reason of these behavior. I read about sync options but they not work.