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• ffmpeg how to ensure audio+video synchronization ?

  22 juin 2020, par roko

  im using this conmmand :

  


  /usr/bin/ffmpeg \
-f pulse -i alsa_output.pci-0000_00_1b.0.analog-stereo.monitor \
-f pulse -i alsa_input.pci-0000_00_1b.0.analog-stereo \
-f x11grab -video_size 2560x1600 -framerate 8 -i :0.0 \
-filter_complex "amix=inputs=2[a]" \
-map 2:v -map '[a]' \
-c:a aac -b:a 128k \
-c:v h264_nvenc -b:v 1500k -maxrate 1500k -minrate 1500k \
-override_ffserver -g 16 http://10.100.102.18:8090/feed1.ffm


  


  my goal is to record screens continuously for long time (all the year)

  


  this is my ffmpeg version (running on RedHat 7.4) :

  


  ffmpeg version 3.4.7 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-39)
  configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --docdir=/usr/share/doc/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --extra-ldflags='-Wl,-z,relro ' --extra-cflags=' ' --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-version3 --enable-bzlib --disable-crystalhd --enable-fontconfig --enable-gcrypt --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libcdio --enable-libdrm --enable-indev=jack --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libmp3lame --enable-nvenc --enable-openal --enable-opencl --enable-opengl --enable-libopenjpeg --enable-libopus --disable-encoder=libopus --enable-libpulse --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzvbi --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-libmfx --enable-runtime-cpudetect
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100


  


  when i run these command i get warning : non monotonous dts in output stream 0:1. this is the output :

  


  [pulse @ 0x13832c0] Thread message queue blocking; consider raising the thread_queue_size option (current value: 8)
Output #0, ffm, to 'http://193.100.200.206:8090/feed1.ffm':
  Metadata:
    creation_time   : now
    encoder         : Lavf57.83.100
    Stream #0:0: Video: h264 (h264_nvenc) (Main), bgr0(progressive), 1920x1080, q=-1--1, 1500 kb/s, 8 fps, 1000k tbn, 8 tbc
    Metadata:
      encoder         : Lavc57.107.100 h264_nvenc
    Side data:
      cpb: bitrate max/min/avg: 1500000/0/1500000 buffer size: 3000000 vbv_delay: -1
    Stream #0:1: Audio: aac (LC), 48000 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      encoder         : Lavc57.107.100 aac
[aac @ 0x13dda80] Queue input is backward in time0:00:00.27 bitrate=5907.7kbits/s speed=0.552x    
[ffm @ 0x13bd5c0] Non-monotonous DTS in output stream 0:1; previous: 320000, current: -195354; changing to 320001. This may result in incorrect timestamps in the output file.                                                              
[ffm @ 0x13bd5c0] Non-monotonous DTS in output stream 0:1; previous: 320001, current: -174021; changing to 320002. This may result in incorrect timestamps in the output file.                                                              
[ffm @ 0x13bd5c0] Non-monotonous DTS in output stream 0:1; previous: 320002, current: -152688; changing to 320003. This may result in incorrect timestamps in the output file.                                                              
[ffm @ 0x13bd5c0] Non-monotonous DTS in output stream 0:1; previous: 320003, current: -131354; changing to 320004. This may result in incorrect timestamps in the output file.                                                              
[ffm @ 0x13bd5c0] Non-monotonous DTS in output stream 0:1; previous: 320004, current: -110021; changing to 320005. This may result in incorrect timestamps in the output file.                                                              
[ffm @ 0x13bd5c0] Non-monotonous DTS in output stream 0:1; previous: 320005, current: -88688; changing to 320006. This may result in incorrect timestamps in the output file.                                                               
[ffm @ 0x13bd5c0] Non-monotonous DTS in output stream 0:1; previous: 320006, current: -67354; changing to 320007. This may result in incorrect timestamps in the output file


  


  when i use -async 1 the warning disapear but, when i play audio file, the audio is Stretches/squeezes for few seconds at the begining and in the end.

  


  how can i ensure that audio and video always stay synchronize ?

  


  does another ffmpeg version fix this problem ? (can i install ffmpeg 4.2.3 on redhat 7.4/7.7) (i know that there is asyncts flag but i dont have it in my version)

  


  Please help me to find solution in order to keep synchronization for long recording.

  


• Comand failed error with ffmpeg Node.js library

  24 juillet 2020, par msrumon

  I have a VPS of 2-core CPU and 2GB of memory. I am using this ffmpeg library to convert a video at a lower resolution and apply watermark. The app gives me this error :

  


  App 1442311 output: Error: Command failed: ffmpeg -i /home/cimbi/galaxnetpictures/tmp/2ee061f0-cd7b-11ea-81aa-05472f29ddbf.mp4 -i /home/cimbi/galaxnetpictures/public/logo.png -f webm -aspect 16:9 -s 1280x720 -filter_complex "overlay=main_w/2-overlay_w/2-0+0:main_h/2-overlay_h/2-0+0, scale=iw*sar:ih, pad=max(iw\,ih*(16/9)):ow/(16/9):(ow-iw)/2:(oh-ih)/2" /home/cimbi/galaxnetpictures/_previews_/e1ec28363c7af82474250fb88a447705.webm
App 1442311 output: ffmpeg version 2.8.15 Copyright (c) 2000-2018 the FFmpeg developers
App 1442311 output:   built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-36)
App 1442311 output:   configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --extra-ldflags='-Wl,-z,relro ' --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-version3 --enable-bzlib --disable-crystalhd --enable-gnutls --enable-ladspa --enable-libass --enable-libcdio --enable-libdc1394 --enable-libfdk-aac --enable-nonfree --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libx264 --enable-libx265 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
App 1442311 output:   libavutil      54. 31.100 / 54. 31.100
App 1442311 output:   libavcodec     56. 60.100 / 56. 60.100
App 1442311 output:   libavformat    56. 40.101 / 56. 40.101
App 1442311 output:   libavdevice    56.  4.100 / 56.  4.100
App 1442311 output:   libavfilter     5. 40.101 /  5. 40.101
App 1442311 output:   libavresample   2.  1.  0 /  2.  1.  0
App 1442311 output:   libswscale      3.  1.101 /  3.  1.101
App 1442311 output:   libswresample   1.  2.101 /  1.  2.101
App 1442311 output:   libpostproc    53.  3.100 / 53.  3.100
App 1442311 output: Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/cimbi/galaxnetpictures/tmp/2ee061f0-cd7b-11ea-81aa-05472f29ddbf.mp4':
App 1442311 output:   Metadata:
App 1442311 output:     major_brand     : mp42
App 1442311 output:     minor_version   : 0
App 1442311 output:     compatible_brands: mp42mp41
App 1442311 output:     creation_time   : 2019-10-26 11:48:02
App 1442311 output:   Duration: 00:00:08.67, start: 0.000000, bitrate: 11191 kb/s
App 1442311 output:     Stream #0:0(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080, 11179 kb/s, 30 fps, 30 tbr, 30k tbn, 60 tbc (default)
App 1442311 output:     Metadata:
App 1442311 output:       creation_time   : 2019-10-26 11:48:02
App 1442311 output:       handler_name    : Alias Data Handler
App 1442311 output:       encoder         : AVC Coding
App 1442311 output: Input #1, png_pipe, from '/home/cimbi/galaxnetpictures/public/logo.png':
App 1442311 output:   Duration: N/A, bitrate: N/A
App 1442311 output:     Stream #1:0: Video: png, rgba64be(pc), 120x30 [SAR 11811:11811 DAR 4:1], 25 tbr, 25 tbn, 25 tbc
App 1442311 output: 
App 1442311 output:     at ChildProcess.exithandler (child_process.js:295:12)
App 1442311 output:     at ChildProcess.emit (events.js:209:13)
App 1442311 output:     at maybeClose (internal/child_process.js:1021:16)
App 1442311 output:     at Process.ChildProcess._handle.onexit (internal/child_process.js:283:5)


  


  Can someone help me understand what this means ?

  


• Encoder (codec vp8) not found [closed]

  25 juillet 2020, par Nirav Trivedi

  There was a problem !

  


  ffmpeg -i uploads/155799695.wav -i uploads/155799695.webm -map 0:0 -map 1:0 uploads/155799695-merged.webm 2>&1


  


  output :

  


  [0] => ffmpeg version 2.6.8 Copyright (c) 2000-2016 the FFmpeg developers
[1] =>   built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-16)
[2] =>   configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic' --enable-bzlib --disable-crystalhd --enable-gnutls --enable-ladspa --enable-libass --enable-libdc1394 --enable-libfaac --enable-nonfree --disable-indev=jack --enable-libfreetype --enable-libgsm --enable-libmp3lame --enable-openal --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libx264 --enable-libx265 --enable-libxvid --enable-x11grab --enable-avfilter --enable-avresample --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-runtime-cpudetect
[3] =>   libavutil      54. 20.100 / 54. 20.100
[4] =>   libavcodec     56. 26.100 / 56. 26.100
[5] =>   libavformat    56. 25.101 / 56. 25.101
[6] =>   libavdevice    56.  4.100 / 56.  4.100
[7] =>   libavfilter     5. 11.102 /  5. 11.102
[8] =>   libavresample   2.  1.  0 /  2.  1.  0
[9] =>   libswscale      3.  1.101 /  3.  1.101
[10] =>   libswresample   1.  1.100 /  1.  1.100
[11] =>   libpostproc    53.  3.100 / 53.  3.100
[12] => Guessed Channel Layout for  Input Stream #0.0 : stereo
[13] => Input #0, wav, from 'uploads/199606400.wav':
[14] =>   Duration: 00:00:09.01, bitrate: 1411 kb/s
[15] =>     Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, 2 channels, s16, 1411 kb/s
[16] => Input #1, matroska,webm, from 'uploads/199606400.webm':
[17] =>   Metadata:
[18] =>     encoder         : Chrome
[19] =>   Duration: N/A, start: 0.000000, bitrate: N/A
[20] =>     Stream #1:0(eng): Video: vp8, yuv420p, 640x480, SAR 1:1 DAR 4:3, 12.58 tbr, 1k tbn, 1k tbc (default)
[21] =>     Metadata:
[22] =>       alpha_mode      : 1
[23] => Output #0, webm, to 'uploads/199606400-merged.webm':
[24] =>     Stream #0:0: Audio: vorbis, 0 channels, 128 kb/s
[25] =>     Metadata:
[26] =>       encoder         : Lavc56.26.100 libvorbis
[27] =>     Stream #0:1(eng): Video: vp8, none, q=2-31, 128 kb/s (default)
[28] =>     Metadata:
[29] =>       alpha_mode      : 1
[30] => Stream mapping:
[31] =>   Stream #0:0 -> #0:0 (pcm_s16le (native) -> vorbis (libvorbis))
[32] =>   Stream #1:0 -> #0:1 (vp8 (native) -> ? (?))
[33] => Encoder (codec vp8) not found for output stream #0:1