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• Can't synchronize frame from two webcam streams side by side using ffmpeg

  15 juin 2019, par Peppe

  i’m trying to stream two webcam in sbs mode using ffmpeg websocket.

  It works but there is a delay of some second between the two scene.

  Here is what I do :

  ffmpeg -f v4l2   -framerate 30 -video_size 1280x720 -input_format mjpeg 
  
  -i /dev/video1 -f v4l2 -framerate 30  -input_format mjpeg 
  
  -video_size 1280x720 -i /dev/video0 -filter_complex "
  
  [0:v][1:v]hstack [left+right]" -map [left+right] -r 30 -fflags nobuffer 
  
  -f mpegts -codec:v mpeg1video -s 2560x720 -b:v 800k -bf 0 http://localhost:8081/secretsecret

  And this is the output :

  ffmpeg version 4.1.3-0ubuntu1 Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 8 (Ubuntu 8.3.0-6ubuntu1)
  
    configuration: --prefix=/usr --extra-version=0ubuntu1 --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-avisynth --enable-gnutls --enable-ladspa --enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libcodec2 --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-librsvg --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --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-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
  
    libavutil      56. 22.100 / 56. 22.100
  
    libavcodec     58. 35.100 / 58. 35.100
  
    libavformat    58. 20.100 / 58. 20.100
  
    libavdevice    58.  5.100 / 58.  5.100
  
    libavfilter     7. 40.101 /  7. 40.101
  
    libavresample   4.  0.  0 /  4.  0.  0
  
    libswscale      5.  3.100 /  5.  3.100
  
    libswresample   3.  3.100 /  3.  3.100
  
    libpostproc    55.  3.100 / 55.  3.100
  
  Input #0, video4linux2,v4l2, from '/dev/video2':
  
      Duration: N/A, start: 9539.835119, bitrate: N/A
  
      Stream #0:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 1280x720, 25 fps, 25 tbr, 1000k tbn, 1000k tbc
  
  Input #1, video4linux2,v4l2, from '/dev/video4':
  
    Duration: N/A, start: 9541.474622, bitrate: N/A
  
      Stream #1:0: Video: mjpeg, yuvj422p(pc, bt470bg/unknown/unknown), 1280x720, 25 fps, 25 tbr, 1000k tbn, 1000k tbc
  
  Stream mapping:
  
    Stream #0:0 (mjpeg) -> hstack:input0
  
    Stream #1:0 (mjpeg) -> hstack:input1
  
    hstack -> Stream #0:0 (mpeg1video)
  
  Press [q] to stop, [?] for help
  
  [swscaler @ 0x55aa2c266f00] deprecated pixel format used, make sure you did set range correctly
  
  Output #0, mpegts, to 'http://localhost:8081/supersecret':
  
    Metadata:
  
  encoder         : Lavf58.20.100
  
  Stream #0:0: Video: mpeg1video, yuv420p, 2560x720, q=2-31, 800 kb/s, 25 fps, 90k tbn, 25 tbc (default)
  
  Metadata:
  
    encoder         : Lavc58.35.100 mpeg1video
  
  Side data:
  
    cpb: bitrate max/min/avg: 0/0/800000 buffer size: 0 vbv_delay: -1
  
  [video4linux2,v4l2 @ 0x55aa2c1d4e40] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)

  It works but there is a delay of 1 second between the two screens.

  also tried with :

  ffmpeg -f v4l2 -framerate 25 -video_size 1280x720 -input_format mjpeg -i \
  
  /dev/video2 -f v4l2 -framerate 25  -input_format mjpeg -video_size 1280x720 \
  
  -i /dev/video4 -filter_complex " \
  
  nullsrc=size=2560x720 [background]; \
  
  [0:v] setpts=PTS-STARTPTS, scale=1280x720 [left]; \
  
  [1:v] setpts=PTS-STARTPTS, scale=1280x720 [right]; \
  
  [background][left]       overlay=shortest=1       [background+left]; \
  
  [background+left][right] overlay=shortest=1:x=1280 [left+right] \
  
  " -map [left+right] -f mpegts -codec:v mpeg1video -s 2560x720 -b:v 800k -bf 0     http://localhost:8081/supersecret

  but same problem....
  How can I fix ?

• subprocess call of ffmpeg returns negative value

  11 juin 2019, par Zak44

  Here is the original command line call that works at shell :

  ffmpeg -i /Users/abc/Desktop/Test/Full_Mov.mov -vf "drawtext=fontfile=/System/Library/Fonts/Keyboard.ttf: text='SCENE BLAH BLAH - %{frame_num}': start_number=1: x=(w-tw)/2: y=h-(2*lh): fontcolor=white: fontsize=20: box=1: boxcolor=black: boxborderw=5","format=yuv420p" -f segment -segment_frames 123 -reset_timestamps 1 -c:a copy -map 0 "/Users/abc/Desktop/Test/%03d_test40.mov"

  Getting a negative value when trying to run ffmpeg via subprocess, causing it to fail and not process. I’ve even tried dumbing down the call to just run ffmpeg by itself with no arguments, and it still returns a negative value.

  import subprocess
  
  ffmpeg = "/usr/local/bin/ffmpeg"
  
  source = "/Users/abc/Desktop/Test/Full_Mov.mov"
  
  destination = "/Users/abc/Desktop/Test/%03d_test40.mov"
  
  cmd = "%s -i %s -vf \"drawtext=fontfile=/System/Library/Fonts/Keyboard.ttf: text='SCENE BLAH BLAH - %%{frame_num}': start_number=1: x=(w-tw)/2: y=h-(2*lh): fontcolor=black: fontsize=20: box=1: boxcolor=white: boxborderw=5\",\"format=yuv420p\" -f segment -segment_frames 123 -reset_timestamps 1 -c:a copy -map 0 \"%s\"" % (ffmpeg, source, destination)
  
  log("ffmpeg cmd: %s" % cmd)
  
  log(subprocess.check_output(cmd, shell=True))

  When running full command :

  CalledProcessError: Command '/usr/local/bin/ffmpeg -i /Users/abc/Desktop/Full_Mov.mov -vf "drawtext=fontfile=/System/Library/Fonts/Keyboard.ttf: text='SCENE BLAH BLAH - %{frame_num}': start_number=1: x=(w-tw)/2: y=h-(2*lh): fontcolor=black: fontsize=20: box=1: boxcolor=white: boxborderw=5","format=yuv420p" -f segment -segment_frames 318 -reset_timestamps 1 -c:a copy -map 0 "/Users/abc/Desktop/Test/%03d.tmp.mov"' returned non-zero exit status -8
  
      raise CalledProcessError(retcode, cmd, output=output)

  When running just ffmpeg no arguments :

  CalledProcessError: Command '/usr/local/bin/ffmpeg' returned non-zero exit status 1
  
      raise CalledProcessError(retcode, cmd, output=output)

  Latest output with suggested changes below :

  subprocess.CalledProcessError: Command '['/usr/local/bin/ffmpeg', '-i', '/Users/szaharak/Desktop/Flix_Test/ep888_sq66_main_mov_2019_05_20_14_15.mov', '-vf', 'drawtext=fontfile=/System/Library/Fonts/Keyboard.ttf:', 'text=SCENE BLAH BLAH - %%{frame_num}:', 'start_number=1:', 'x=(w-tw)/2:', 'y=h-(2*lh):', 'fontcolor=black:', 'fontsize=20:', 'box=1:', 'boxcolor=white:', 'boxborderw=5', 'format=yuv420p', '-f', 'segment', '-segment_frames', '123', '-reset_timestamps', '1', '-c:a', 'copy', '-map', '0', '/Users/szaharak/Desktop/Flix_Test/%03d_test40.mov']' returned non-zero exit status 1
  
  
  
  [NULL @ 0x7f88c3012200] Unable to find a suitable output format for 'text=SCENE BLAH BLAH - %%{frame_num}:'
  
  text=SCENE BLAH BLAH - %%{frame_num}:: Invalid argument

  And here is latest...

      >>> rc = subprocess.check_call(cmd)
  
  ffmpeg version N-93891-ge1839283bc-tessus  https://evermeet.cx/ffmpeg/  Copyright (c) 2000-2019 the FFmpeg developers
  
    built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
  
    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
  
  
  
    libavutil      56. 28.100 / 56. 28.100
  
    libavcodec     58. 52.102 / 58. 52.102
  
    libavformat    58. 27.103 / 58. 27.103
  
    libavdevice    58.  7.100 / 58.  7.100
  
    libavfilter     7. 53.101 /  7. 53.101
  
    libswscale      5.  4.101 /  5.  4.101
  
    libswresample   3.  4.100 /  3.  4.100
  
    libpostproc    55.  4.100 / 55.  4.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/Users/szaharak/Desktop/Flix_Test/ep888_sq66_main_mov_2019_05_20_14_15.mov':
  
    Metadata:
  
      major_brand     : qt  
  
      minor_version   : 537199360
  
      compatible_brands: qt  
  
      creation_time   : 2019-05-14T17:58:24.000000Z
  
      com.apple.quicktime.player.movie.audio.gain: 1.000000
  
      com.apple.quicktime.player.movie.audio.treble: 0.000000
  
      com.apple.quicktime.player.movie.audio.bass: 0.000000
  
      com.apple.quicktime.player.movie.audio.balance: 0.000000
  
      com.apple.quicktime.player.movie.audio.pitchshift: 0.000000
  
      com.apple.quicktime.player.movie.audio.mute: 
  
      com.apple.quicktime.player.movie.visual.brightness: 0.000000
  
      com.apple.quicktime.player.movie.visual.color: 1.000000
  
      com.apple.quicktime.player.movie.visual.tint: 0.000000
  
      com.apple.quicktime.player.movie.visual.contrast: 1.000000
  
      com.apple.quicktime.player.version: 7.6.6 (7.6.6)
  
      com.apple.quicktime.version: 7.7.3 (2943.14) 0x7738000 (Mac OS X, 10.11.6, 15G22010)
  
    Duration: 00:01:12.67, start: 0.000000, bitrate: 23379 kb/s
  
      Stream #0:0(eng): Video: mjpeg (Baseline) (jpeg / 0x6765706A), yuvj422p(pc, bt470bg/unknown/unknown), 1280x720 [SAR 72:72 DAR 16:9], 21838 kb/s, 24 fps, 24 tbr, 24k tbn, 24k tbc (default)
  
      Metadata:
  
        creation_time   : 2019-05-14T17:58:24.000000Z
  
        handler_name    : Apple Video Media Handler
  
        encoder         : Photo - JPEG
  
      Stream #0:1(eng): Audio: pcm_s16be (twos / 0x736F7774), 48000 Hz, stereo, s16, 1536 kb/s (default)
  
      Metadata:
  
        creation_time   : 2019-05-14T17:58:24.000000Z
  
        handler_name    : Apple Sound Media Handler
  
  [NULL @ 0x7f8ddc8ce200] Unable to find a suitable output format for 'text=SCENE BLAH BLAH - %{frame_num}: start_number=1: x=(w-tw)/2: y=h-(2*lh): fontcolor=black: fontsize=20: box=1: boxcolor=white: boxborderw=5: format=yuv420p'
  
  text=SCENE BLAH BLAH - %{frame_num}: start_number=1: x=(w-tw)/2: y=h-(2*lh): fontcolor=black: fontsize=20: box=1: boxcolor=white: boxborderw=5: format=yuv420p: Invalid argument
  
  Traceback (most recent call last):
  
    File "<stdin>", line 1, in <module>
  
    File "/usr/local/Cellar/python@2/2.7.15_1/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 190, in check_call
  
      raise CalledProcessError(retcode, cmd)
  
  subprocess.CalledProcessError: Command '['/usr/local/bin/ffmpeg', '-i', '/Users/szaharak/Desktop/Flix_Test/ep888_sq66_main_mov_2019_05_20_14_15.mov', '-vf', 'drawtext=fontfile=/System/Library/Fonts/Keyboard.ttf:', 'text=SCENE BLAH BLAH - %{frame_num}: start_number=1: x=(w-tw)/2: y=h-(2*lh): fontcolor=black: fontsize=20: box=1: boxcolor=white: boxborderw=5: format=yuv420p', '-f', 'segment', '-segment_frames', '123', '-reset_timestamps', '1', '-c:a', 'copy', '-map', '0', '/Users/szaharak/Desktop/Flix_Test/%03d_test40.mov']' returned non-zero exit status 1
  
  </module></stdin>

• Ffmpeg stream stops after a couple of seconds

  28 juin 2019, par Connor Woodford

  I have an http stream of an mkv file that I am trying to transcode to mp4 via ffmpeg. Here is the command I enter to start the stream ffmpeg -i "input.mkv" -f mpeg1video -vf "scale=640:480" -r 20 "http://localhost:port". The stream starts fine. Here is what the stream gives me at first :

  Metadata:
     title           : Chapter 17
   Stream #0:0(eng): Video: mpeg1video, yuv420p, 640x480 [SAR 4:3 DAR 16:9], q=2-31, 200 kb/s, 24 fps, 24 tbn, 24 tbc
   Metadata:
     BPS-eng         : 31632108
     DURATION-eng    : 02:03:42.289875000
     NUMBER_OF_FRAMES-eng: 177957
     NUMBER_OF_BYTES-eng: 29347831113
     SOURCE_ID-eng   : 001011
     _STATISTICS_WRITING_APP-eng: MakeMKV v1.14.2 win(x64-release)
     _STATISTICS_WRITING_DATE_UTC-eng: 2019-06-18 22:53:22
     _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES SOURCE_ID
     encoder         : Lavc58.31.102 mpeg1video
   Side data:
     cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
frame=  111 fps=0.0 q=6.2 size=     212kB time=00:00:04.54 bitrate= 382.2kbits/s speed=8.82x

  but after this shows up it hangs for a while then it gives me this :

  av_interleaved_write_frame(): Unknown errorime=00:00:05.24 bitrate= 788.3kbits/s speed=10.5x
  
  Error writing trailer of http://192.168.1.19:4012: Error number -10054 occurred
  
  frame=  128 fps=1.1 q=12.1 Lsize=     646kB time=00:00:05.84 bitrate= 905.0kbits/s speed=0.0487x
  
  video:343kB audio:274kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 4.639489%
  
  [http @ 000001cb1fdac780] URL read error:  -10054
  
  Conversion failed!

  Here is my http server in node.js :

  const express = require('express')
  
  const port = port
  
  var ffmpeg = require('ffmpeg');
  
  var http = require('http')
  
  
  
  var server = http.createServer(function(req, res) {
  
      res.writeHead(200, {'Content-Type': 'video/mp4'});
  
  })
  
  
  
  server.listen(port, 'ipAddress')
  
  console.log(`Example app on port ${port}!`);