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  • TV Screen gittery while sending Stream using FFMPEG Android

    24 septembre 2019, par Arvind

    I am getting issue while i am sending the stream to wowza using FFMPEG on RTMP issue is stream working good sending to wowza but issue is while sending its making android tv screen gittery probable what i found this is because its taking time on transcoding and UI thread gets hang

    let me show you my command :

    -i - -strict experimental -acodec aac -ac 1 -ar 44100 -vcodec libx264 -pix_fmt yuv420p -g 8 -vb 26k -profile:v main -preset ultrafast -r 8 -f flv -threads 0 -async 1 -vsync 1 rtmp://origin.cdn.wowza.com:1935

    and below some log:

     D/From the FFMPEG: frame=   51 fps= 13 q=40.0 size=      85kB time=00:00:06.52 bitrate= 107.0kbits/s dup=6 drop=273 speed=1.61x    
09-24 03:27:42.094 2189-2189/com.addwatchhdmi.app D/Execute onProgress: frame=   51 fps= 13 q=40.0 size=      85kB time=00:00:06.52 bitrate= 107.0kbits/s dup=6 drop=273 speed=1.61x

  • Only '-vf scale.....' read, ignoring remaining -vf options : Use ',' to separate filters even though no other vf present

    24 septembre 2019, par Vitalis Hommel

    I am using

    ffmpeg -y -ss 00:02:24.643 -fflags +igndts -t 00:00:39.337 -i 1.mp4 -r 60 -c:v libx264 -copytb 1 -vf scale=-2:1080,pad=width=1920:height=1080:x=0:y=656:color=black -af afade=t=in:ss=0:d=1,afade=t=out:st='00\:00\:38.337':d=1 2.mp4

    and I get

    Only '-vf scale=-2:1080,pad=width=1920:height=1080:x=0:y=656:color=black' read, ignoring remaining -vf options: Use ',' to separate filters
Only '-af afade=t=in:ss=0:d=1,afade=t=out:st='00\:00\:38.337':d=1' read, ignoring remaining -af options: Use ',' to separate filters

    How to solve this?

  • How to merge and synchronize the audio with the processed video for real time streaming ?

    24 septembre 2019, par Padfoot

    I am detecting objects on a RTMP video+audio stream. The output, object detected video stream doesn't contain audio in it. How to merge the audio back to the output for real-time video+object streaming output ?

    I am using YOLO in darknet C framework. The FPS is 40. Also the output stream needs to be in 25-30 FPS.

  • FFmpeg, error hardcoding subtitles

    24 septembre 2019, par Ricardo

    I'm trying to use ffmpeg to hardcode subtitles, but it gives this error:

    No such filter: 'subtitles'
Error opening filters!

    My ffmpeg command and complete console output:

    root@srv96:/home/Kawaii/web/mysite.com/public_html# ffmpeg -i input.mkv -vf subtitles=input.mkv output.mp4
ffmpeg version 1.0.10 Copyright (c) 2000-2014 the FFmpeg developers
  built on Jul 25 2014 07:50:40 with gcc 4.7 (Debian 4.7.2-5)
  configuration: --prefix=/usr --extra-cflags='-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security ' --extra-ldflags='-Wl,-z,relro' --cc='ccache cc' --enable-shared --enable-libmp3lame --enable-gpl --enable-nonfree --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-x11grab --enable-libgsm --enable-libtheora --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libspeex --enable-nonfree --disable-stripping --enable-libvpx --enable-libschroedinger --disable-encoder=libschroedinger --enable-version3 --enable-libopenjpeg --enable-librtmp --enable-avfilter --enable-libfreetype --enable-libvo-aacenc --disable-decoder=amrnb --enable-libvo-amrwbenc --enable-libaacplus --libdir=/usr/lib/x86_64-linux-gnu --disable-vda --enable-libbluray --enable-libcdio --enable-gnutls --enable-frei0r --enable-openssl --enable-libass --enable-libopus --enable-fontconfig --enable-libfdk-aac --enable-libdc1394 --disable-altivec --dis  libavutil      51. 73.101 / 51. 73.101
  libavcodec     54. 59.100 / 54. 59.100
  libavformat    54. 29.104 / 54. 29.104
  libavdevice    54.  2.101 / 54.  2.101
  libavfilter     3. 17.100 /  3. 17.100
  libswscale      2.  1.101 /  2.  1.101
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
Input #0, matroska,webm, from 'input.mkv':
  Metadata:
    creation_time   : 2015-11-22 10:34:03
  Duration: 00:12:30.22, start: 0.000000, bitrate: 578 kb/s
    Stream #0:0: Video: h264 (High), yuv420p, 1280x720, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
    Metadata:
      BPS             : 524797
      BPS-eng         : 524797
      DURATION        : 00:12:30.083000000
      DURATION-eng    : 00:12:30.083000000
      NUMBER_OF_FRAMES: 17984
      NUMBER_OF_FRAMES-eng: 17984
      NUMBER_OF_BYTES : 49205170
      NUMBER_OF_BYTES-eng: 49205170
      _STATISTICS_WRITING_APP: mkvmerge v8.3.0 ('Over the Horizon') 64bit
      _STATISTICS_WRITING_APP-eng: mkvmerge v8.3.0 ('Over the Horizon') 64bit
      _STATISTICS_WRITING_DATE_UTC: 2015-11-22 10:34:03
      _STATISTICS_WRITING_DATE_UTC-eng: 2015-11-22 10:34:03
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:1(jpn): Audio: aac, 48000 Hz, stereo, s16 (default)
    Metadata:
      BPS             : 52275
      BPS-eng         : 52275
      DURATION        : 00:12:30.209000000
      DURATION-eng    : 00:12:30.209000000
      NUMBER_OF_FRAMES: 17583
      NUMBER_OF_FRAMES-eng: 17583
      NUMBER_OF_BYTES : 4902222
      NUMBER_OF_BYTES-eng: 4902222
      _STATISTICS_WRITING_APP: mkvmerge v8.3.0 ('Over the Horizon') 64bit
      _STATISTICS_WRITING_APP-eng: mkvmerge v8.3.0 ('Over the Horizon') 64bit
      _STATISTICS_WRITING_DATE_UTC: 2015-11-22 10:34:03
      _STATISTICS_WRITING_DATE_UTC-eng: 2015-11-22 10:34:03
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
    Stream #0:2: Subtitle: ssa (default)
    Metadata:
      BPS             : 94
      BPS-eng         : 94
      DURATION        : 00:12:29.290000000
      DURATION-eng    : 00:12:29.290000000
      NUMBER_OF_FRAMES: 166
      NUMBER_OF_FRAMES-eng: 166
      NUMBER_OF_BYTES : 8841
      NUMBER_OF_BYTES-eng: 8841
      _STATISTICS_WRITING_APP: mkvmerge v8.3.0 ('Over the Horizon') 64bit
      _STATISTICS_WRITING_APP-eng: mkvmerge v8.3.0 ('Over the Horizon') 64bit
      _STATISTICS_WRITING_DATE_UTC: 2015-11-22 10:34:03
      _STATISTICS_WRITING_DATE_UTC-eng: 2015-11-22 10:34:03
      _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
[AVFilterGraph @ 0x6e4a60] No such filter: 'subtitles'
Error opening filters!
root@srv96:/home/Kawaii/web/mysite.com/public_html#

    Am using debian 7.

  • FFmpeg check channels of a 7.1 audio for silence

    24 septembre 2019, par Tina J

    This is a follow-up question from my previous question asked here, where I needed to look for silence within a specific audio track. Here is the ffmpeg life-saver solution where helps to get some metadata:

    ffmpeg -i file -map 0:a:1 -af astats -f null -

    But I have other type of input .mp4 files where they have one single track of 8 (i.e. 7.1) audio channels. Apparently these files are transcoded from an original file (somehow the 4 track stereos are squished into these files). Now similar to my previous, I need to know if the original file was 2-channel stereo or 5.1 (6) channel.

    How to know if a specific channel of an audio track (say Center channel) is silent/mute, possibly using ffmpeg? Here is a sample .mp4 file.

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