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• node.js ffmpeg spawn child_process unexpected data output and not possible to kill or stop

  1er septembre 2021, par PLNR

  
I'm rather new to backend stuff, so please excuse, if my question is trivial.
  
For an Intranet project, I want to present a video element in a webpage (React, HLS.js Player) with the possibility reload the stream in case it hung.
  
The video sources are mpeg-ts streams delivered as udp multicast.
  
A small node.js / express server should handle the ffmpeg commands, to transcode the multicast to hls to display them in a browser.
  

  
My Problem is, that I am unable to stop the process...
  
I've tried to SIGINT, SIGTERM the process with it's pid, but the encoding is just going on.

  


  Here is the code I wrote for transcoding so far :

  


  const express = require("express");
const { spawn, exec } = require("child_process");
const cors = require("cors");
const process = require("process")

let ls;
let pid;

const app = express();

app.use(cors());

app.get('/cam/:source', (body) => {
    const cam = body.params.source;
    console.log(cam);

    let source = "udp://239.1.1.1:4444";
    let stream = "/var/www/html/streams/tmp/cam1.m3u8"


    stream = spawn("ffmpeg", ["-re", "-i", source, "-c:v", "libx264", "-crf", "21", "-preset", "veryfast", "-c:a", "aac", "-b:a", "128k", "-ac", "2", "-f", "hls", "-hls_list_size", "5", "-hls_flags", "delete_segments", stream], {detached: true});

    pid = stream.pid;

    stream.stdout.on("data", data => {
        console.log(`stdout: ${data}`);
    });

    stream.stderr.on("data", data => {
        console.log(`stderr: ${data}`);
        console.log("pid: ", pid);
    });

    stream.on("error", error => {
        console.log(`error: ${error.message}`);
    });

    stream.on("close", code => {
        console.log(`child process exited with code ${code}`);
    });
})

app.get('/cam/quit', () => {
    process.kill(pid, 'SIGINT')
})

app.listen(5000, ()=> {
    console.log('Listening');
})


  


  On requesting the /cam/quit i would expect the process to stop... but it doesn't.
  
I've tried :

  


  app.get('/cam/quit', () => {
    process.kill(pid, 'SIGINT')
})


  


  app.get('/cam/quit', () => {
    process.kill(stream.pid, 'SIGINT')
})


  


  app.get('/cam/quit', () => {
    stream.kill(pid, 'SIGINT')
})


  


  app.get('/cam/quit', () => {
    stream.kill(0, 'SIGINT')
})


  


  But none of this worked... do I miss something ? Is there something I need to change ?

  


  Problem 2 - Output :
  
The output is emitted on stderr... even the process is working as expected.
  
This is maybe only cosmetics, but it makes me wondering.
  
Here is the terminal output :

  


  [nodemon] starting `node server.js`
Listening
camera stream reloaded
stderr: ffmpeg version 4.3.2-0+deb11u1ubuntu1 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10 (Ubuntu 10.2.1-20ubuntu1)
  configuration: --prefix=/usr --extra-version=0+deb11u1ubuntu1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --enable-avresample --disable-filter=resample --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librabbitmq --enable-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal --enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-nvenc --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100

pid:  4206
stderr: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'udp://239.1.1.1':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    creation_time   : 
pid:  4206
stderr: 1970-01-01T00:00:00.000000Z
    encoder         : Lavf52.54.0
  Duration: 01:55:59.20, start: 0.000000, bitrate: 1436 kb/s
    Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 720x384 [SAR 1:1 DAR 15:8], 1272 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc (default)
    Metadata:
      creation_time   : 1970-01-01T00:00:00.000000Z
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 159 kb/s (default)
    Metadata:
      creation_time   : 1970-01-01T00:00:00.000000Z
      handler_name    : SoundHandler

pid:  4206
stderr: Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  Stream #0:1 -> #0:1 (aac (native) -> aac (native))
Press [q] to stop, [?] for help

pid:  4206
stderr: [libx264 @ 0x5616b38b5440] using SAR=1/1

pid:  4206
stderr: [libx264 @ 0x5616b38b5440] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2

pid:  4206
stderr: [libx264 @ 0x5616b38b5440] profile High, level 3.0, 4:2:0, 8-bit

pid:  4206
stderr: [libx264 @ 0x5616b38b5440] 264 - core 160 r3011 cde9a93 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=2 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=6 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=1 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=10 rc=crf mbtree=1 crf=21.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, hls, to '/var/www/html/streams/tmp/aft.m3u8':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.45.100
    Stream #0:0(und): Video: h264 (libx264), yuv420p, 720x384 [SAR 1:1 DAR 15:8], q=-1--1, 25 fps, 90k tbn, 25 tbc (default)
    Metadata:
      creation_time   : 1970-01-01T00:00:00.000000Z
      handler_name    : VideoHandler
      encoder         : Lavc58.91.100 libx264
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
    Stream #0:1(und): Audio: aac (LC), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      creation_time   : 1970-01-01T00:00:00.000000Z
      handler_name    : SoundHandler
      encoder         : Lavc58.91.100 aac

pid:  4206
stderr: frame=    8 fps=0.0 q=0.0 size=N/A time=00:00:00.46 bitrate=N/A speed=0.931x    
pid:  4206
stderr: frame=   21 fps= 21 q=26.0 size=N/A time=00:00:00.96 bitrate=N/A speed=0.95x    
pid:  4206
stderr: frame=   33 fps= 22 q=26.0 size=N/A time=00:00:01.49 bitrate=N/A speed=0.982x    
pid:  4206
stderr: frame=   46 fps= 23 q=26.0 size=N/A time=00:00:02.00 bitrate=N/A speed=0.989x    
pid:  4206
stderr: frame=   58 fps= 23 q=26.0 size=N/A time=00:00:02.49 bitrate=N/A speed=0.986x    
pid:  4206


  


  and so on...
  

  
Any help would be highly appreciated !
  
Many thanks in advance

  


• when i built ffmpeg to push raspberry pi 4 camera stream to my sever,I get Unknown input format : 'h264' ERROR

  26 janvier 2021, par IOKE Bai

  input :

  


  


  raspivid -o - -t 0 -vf -hf -fps 10 -b 500000 | ffmpeg -re -ar 44100
-ac 2 -acodec pcm_s16le -f s16le -ac 2 -i /dev/zero -f h264 -i - -vcodec copy -acodec aac -ab 128k -g 50 -strict experimental -f flv rtmp ://111.111.111.111/live/stream

  


  


  output :

  


  


  


  ffmpeg version N-100793-gc7016e35a6 Copyright (c) 2000-2021
the FFmpeg developers
built with gcc 8 (Raspbian 8.3.0-6+rpi1)
configuration : —extra-ldflags=-latomic —enable-gpl —enable-version3 —enable-nonfree
—enable-static —disable-shared —prefix=/usr/local —disable-opencl —disable-thumb —disable-pic —disable-stripping
—enable-small —enable-ffmpeg —enable-ffplay —enable-ffprobe —disable-doc —disable-htmlpages —disable-podpages —disable-txtpages —disable-manpages —disable-everything —enable-libx264 —enable-encoder=libx264 —enable-encoder=h264
—enable-decoder=h264 —enable-decoder=pcm_s16le —enable-encoder=aac —enable-decoder=aac —enable-encoder=ac3 —enable-decoder=ac3 —enable-encoder=rawvideo —enable-decoder=rawvideo —enable-encoder=mjpeg —enable-decoder=mjpeg —enable-demuxer=concat —enable-muxer=flv —enable-demuxer=flv —enable-demuxer=live_flv —enable-muxer=hls —enable-muxer=segment —enable-muxer=stream_segment —enable-muxer=mov —enable-demuxer=mov —enable-muxer=mp4 —enable-muxer=mpegts —enable-demuxer=mpegts —enable-demuxer=mpegvideo —enable-muxer=matroska —enable-demuxer=matroska —enable-muxer=wav —enable-demuxer=wav —enable-muxer='pcm*' —enable-demuxer='pcm*' —enable-muxer=rawvideo —enable-demuxer=rawvideo —enable-muxer=rtsp —enable-demuxer=rtsp —enable-muxer=rtsp —enable-demuxer=sdp —enable-muxer=fifo —enable-muxer=tee —enable-parser=h264 —enable-parser=aac —enable-protocol=file —enable-protocol=tcp —enable-protocol=rtmp —enable-protocol=cache —enable-protocol=pipe —enable-filter=aresample —enable-filter=allyuv —enable-filter=scale —enable-libfreetype —enable-indev=v4l2 —enable-indev=alsa —enable-omx —enable-omx-rpi —enable-encoder=h264_omx —enable-mmal —enable-hwaccel=h264_mmal —enable-decoder=h264_mmal
libavutil 56. 63.101 / 56. 63.101
libavcodec 58.118.100 / 58.118.100
libavformat 58. 65.101 / 58. 65.101
libavdevice 58. 11.103 / 58. 11.103
libavfilter 7. 97.100 / 7. 97.100
libswscale 5. 8.100 / 5. 8.100
libswresample 3. 8.100 / 3. 8.100
libpostproc 55. 8.100 / 55. 8.100
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, s16le, from '/dev/zero' :
Duration : N/A, bitrate : 1411 kb/s
Stream #0:0 : Audio : pcm_s16le, 44100 Hz, stereo, s16, 1411 kb/s

  


  


  


  ERROR

  


  


  Unknown input format : 'h264'

  


  


• No such filter : 'xfade_opencl' on ffmpeg latest snapshot

  23 janvier 2021, par jsaluja

  I wrote a custom transition kernel, and ran into No such filter : 'xfade_opencl' on the latest snapshot of ffmpeg

  


  ffmpeg -filters doesnt list xfade_opencl

  


  ffmpeg version N-100739-gda607832b5-tessu

  


  Did anyone successfuly use xfade_opencl ?

  


  ====

  


  ffmpeg version N-100739-gda607832b5-tessus https://evermeet.cx/ffmpeg/ Copyright (c) 2000-2021 the FFmpeg developers
built with Apple clang version 11.0.0 (clang-1100.0.33.17)
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-libvmaf —enable-libvo-amrwbenc —enable-libvorbis —enable-libvpx —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxavs —enable-libxvid —enable-libzimg —enable-libzmq —enable-libzvbi —enable-version3 —pkg-config-flags=—static —disable-ffplay
libavutil 56. 63.101 / 56. 63.101
libavcodec 58.117.101 / 58.117.101
libavformat 58. 65.101 / 58. 65.101
libavdevice 58. 11.103 / 58. 11.103
libavfilter 7. 96.100 / 7. 96.100
libswscale 5. 8.100 / 5. 8.100
libswresample 3. 8.100 / 3. 8.100
libpostproc 55. 8.100 / 55. 8.100

  


  ===