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• Options to re-encode video with new key frames

  24 novembre 2022, par muraliv

  I need to add key frames at 2 second intervals in this video.

  


  ffprobe input-video.mp4 
ffprobe version 5.1.2 Copyright (c) 2007-2022 the FFmpeg developers
  built with Apple clang version 14.0.0 (clang-1400.0.29.102)
  configuration: --prefix=/usr/local/Cellar/ffmpeg/5.1.2 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox
  libavutil      57. 28.100 / 57. 28.100
  libavcodec     59. 37.100 / 59. 37.100
  libavformat    59. 27.100 / 59. 27.100
  libavdevice    59.  7.100 / 59.  7.100
  libavfilter     8. 44.100 /  8. 44.100
  libswscale      6.  7.100 /  6.  7.100
  libswresample   4.  7.100 /  4.  7.100
  libpostproc    56.  6.100 / 56.  6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'input-video.mp4':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42mp41
    creation_time   : 2022-11-23T10:04:47.000000Z
  Duration: 00:02:00.15, start: 0.000000, bitrate: 16302 kb/s
  Stream #0:0[0x1](eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 16174 kb/s, 23.98 fps, 23.98 tbr, 24k tbn (default)
    Metadata:
      creation_time   : 2022-11-23T10:04:47.000000Z
      handler_name    : ?Mainconcept Video Media Handler
      vendor_id       : [0][0][0][0]
      encoder         : AVC Coding
  Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 125 kb/s (default)
    Metadata:
      creation_time   : 2022-11-23T10:04:47.000000Z
      handler_name    : #Mainconcept MP4 Sound Media Handler
      vendor_id       : [0][0][0][0]


  


  I used this ffmpeg command for this purpose.

  


  ffmpeg -i input-video.mp4 -codec:v libx264 -r 23.976 -force_key_frames "expr:gte(t,n_forced*2)" -c:a copy -y output.mp4


  


  However, this output.mp4 now has different video bitrate (3692 kb/s) compared to the original video (16302 kb/s). How do I use the ffmpeg command to re-encode the video with key frames and with the same bitrate as original video ?

  


• codification of whammy.js fails

  5 novembre 2022, par DevStarlight

  I've been developing a mediastream application capturing video and audio using mediastreamrecorder and whammy.js.

  



  In this process I have found a issue and I suspect it is related to the way whammy.js render and store into a blob var.

  



  I realiced about this because I was trying to encode audio (wav) and video (webm) into mp4 with ffmpeg.
For any reason I don't really know at all, some of the videos were encoded correctly but others were not. When It wasn't encoded correctly, the video was not fluent but the audio was.

  



  I've been using this ffmpeg sentence :

  



  'ffmpeg -i path/to/file.wav -i path/to/file.webm -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" -map 0:0 -map 1:0 -c:v libx264 -preset ultrafast -qp 0 -c:a libvo_aacenc -b:a 128k path/to/file.mp4'


  



  Then checking with ffprobe on a good conversion and a bad conversion into mp4 with the same camera I got what it comes :

  



  For the good one :

  



  ffprobe version N-77003-g64f7db5 Copyright (c) 2007-2015 the FFmpeg developers
  built with gcc 5.2.1 (Ubuntu 5.2.1-22ubuntu2) 20151010
  configuration: --prefix=/home/devstarlight/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/devstarlight/ffmpeg_build/include --extra-ldflags=-L/home/devstarlight/ffmpeg_build/lib --bindir=/home/devstarlight/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree
  libavutil      55.  9.100 / 55.  9.100
  libavcodec     57. 16.101 / 57. 16.101
  libavformat    57. 19.100 / 57. 19.100
  libavdevice    57.  0.100 / 57.  0.100
  libavfilter     6. 19.100 /  6. 19.100
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/devstarlight/Escritorio/178.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf56.36.100
  Duration: 00:00:04.50, start: 0.036281, bitrate: 5821 kb/s
    Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 129 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
    Stream #0:1(und): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuv420p, 400x400 [SAR 1:1 DAR 1:1], 5841 kb/s, 16 fps, 16 tbr, 16384 tbn, 32 tbc (default)
    Metadata:
      handler_name    : VideoHandler


  



  For the wrong conversion :

  



  ffprobe version N-77003-g64f7db5 Copyright (c) 2007-2015 the FFmpeg developers
  built with gcc 5.2.1 (Ubuntu 5.2.1-22ubuntu2) 20151010
  configuration: --prefix=/home/devstarlight/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/devstarlight/ffmpeg_build/include --extra-ldflags=-L/home/devstarlight/ffmpeg_build/lib --bindir=/home/devstarlight/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree
  libavutil      55.  9.100 / 55.  9.100
  libavcodec     57. 16.101 / 57. 16.101
  libavformat    57. 19.100 / 57. 19.100
  libavdevice    57.  0.100 / 57.  0.100
  libavfilter     6. 19.100 /  6. 19.100
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/devstarlight/Escritorio/179.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf56.36.100
  Duration: 00:00:04.50, start: 0.036281, bitrate: 12815 kb/s
    Stream #0:0(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
    Stream #0:1(und): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuv420p, 400x400 [SAR 1:1 DAR 1:1], 13381 kb/s, 1000.24 fps, 1k tbr, 16k tbn, 2k tbc (default)
    Metadata:
      handler_name    : VideoHandler


  



  Then I looked into the webm files directly and I realiced that there was no fps defined in the bad file :

  



  The good record :

  



  ffprobe version N-77003-g64f7db5 Copyright (c) 2007-2015 the FFmpeg developers
  built with gcc 5.2.1 (Ubuntu 5.2.1-22ubuntu2) 20151010
  configuration: --prefix=/home/devstarlight/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/devstarlight/ffmpeg_build/include --extra-ldflags=-L/home/devstarlight/ffmpeg_build/lib --bindir=/home/devstarlight/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree
  libavutil      55.  9.100 / 55.  9.100
  libavcodec     57. 16.101 / 57. 16.101
  libavformat    57. 19.100 / 57. 19.100
  libavdevice    57.  0.100 / 57.  0.100
  libavfilter     6. 19.100 /  6. 19.100
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
Input #0, matroska,webm, from '/home/devstarlight/Escritorio/179.webm':
  Metadata:
    encoder         : whammy
  Duration: 00:00:04.25, start: 0.000000, bitrate: 1859 kb/s
    Stream #0:0: Video: vp8, yuv420p, 400x400, SAR 1:1 DAR 1:1, 1k tbr, 1k tbn, 1k tbc (default)


  



  The bad record :

  



  ffprobe version N-77003-g64f7db5 Copyright (c) 2007-2015 the FFmpeg developers
  built with gcc 5.2.1 (Ubuntu 5.2.1-22ubuntu2) 20151010
  configuration: --prefix=/home/devstarlight/ffmpeg_build --pkg-config-flags=--static --extra-cflags=-I/home/devstarlight/ffmpeg_build/include --extra-ldflags=-L/home/devstarlight/ffmpeg_build/lib --bindir=/home/devstarlight/bin --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree
  libavutil      55.  9.100 / 55.  9.100
  libavcodec     57. 16.101 / 57. 16.101
  libavformat    57. 19.100 / 57. 19.100
  libavdevice    57.  0.100 / 57.  0.100
  libavfilter     6. 19.100 /  6. 19.100
  libswscale      4.  0.100 /  4.  0.100
  libswresample   2.  0.101 /  2.  0.101
  libpostproc    54.  0.100 / 54.  0.100
Input #0, matroska,webm, from '/home/devstarlight/Escritorio/178.webm':
  Metadata:
    encoder         : whammy
  Duration: 00:00:04.36, start: 0.000000, bitrate: 1461 kb/s
    Stream #0:0: Video: vp8, yuv420p, 400x400, SAR 1:1 DAR 1:1, 16 fps, 16 tbr, 1k tbn, 1k tbc (default)


  



  ffmpeg output rate option (-r) is empty and rate is forced to 25 fps (because in fact in the webm it doesn't exist).

  



  Is that issue registered at any point or someone know how to solve it ?

  



  Thanks in advice.

  


• ffmpeg_streaming capture Webcam

  10 décembre 2022, par Anoop Yadav

  I am trying to run the following example from https://github.com/aminyazdanpanah/python-ffmpeg-video-streaming : To capture the webcam and convert it to hls.

  


  import ffmpeg_streaming
import logging

from ffmpeg_streaming import Formats

logging.basicConfig(level=logging.DEBUG)

video = ffmpeg_streaming.input(r"Integrated Webcam", capture=True)

hls = video.hls(Formats.h264())
hls.auto_generate_representations()
hls.output(r'C:\PycharmProjects\hls\hls.m3u8')


  


  To list the webcam I used the command : ffmpeg -list_devices true -f dshow -i dummy

  


  Output :

  


  [dshow @ 0000025f5317ecc0] "Integrated Webcam" (video)
[dshow @ 0000025f5317ecc0]   Alternative name "@device_pnp_\\?\usb#vid_0bda&pid_5673&mi_00#6&15ef479&0&0000#{65e8773d-8f56-11d0-a3b9-00a0c9223196}\global"
[dshow @ 0000025f5317ecc0] "Microphone Array (Realtek(R) Audio)" (audio)
[dshow @ 0000025f5317ecc0]   Alternative name "@device_cm_{33D9A762-90C8-11D0-BD43-00A0C911CE86}\wave_{13610D2E-9970-4A37-8D19-42A73F796ED1}"


  


  I am getting this error :

  


  INFO:root:ffprobe running command: ffprobe -show_format -show_streams -of json video=Integrated Webcam
ERROR:root:b'{\r\n\r\n}\r\n'b'ffprobe version N-109396-g9651f873f8-20221209 Copyright (c) 2007-2022 the FFmpeg developers\r\n  built with gcc 12.2.0 (crosstool-NG 1.25.0.90_cf9beb1)\r\n  configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-libxml2 --enable-zlib --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvorbis --enable-opencl --disable-libpulse --enable-libvmaf --disable-libxcb --disable-xlib --enable-amf --enable-libaom --enable-libaribb24 --enable-avisynth --enable-chromaprint --enable-libdav1d --enable-libdavs2 --disable-libfdk-aac --enable-ffnvcodec --enable-cuda-llvm --enable-frei0r --enable-libgme --enable-libkvazaar --enable-libass --enable-libbluray --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librist --enable-libssh --enable-libtheora --enable-libvpx --enable-libwebp --enable-lv2 --disable-libmfx --enable-libvpl --enable-openal --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-librav1e --enable-librubberband --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libsvtav1 --enable-libtwolame --enable-libuavs3d --disable-libdrm --disable-vaapi --enable-libvidstab --enable-vulkan --enable-libshaderc --enable-libplacebo --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libzimg --enable-libzvbi --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-ldexeflags= --extra-libs=-lgomp --extra-version=20221209\r\n  libavutil      57. 43.100 / 57. 43.100\r\n  libavcodec     59. 54.101 / 59. 54.101\r\n  libavformat    59. 34.102 / 59. 34.102\r\n  libavdevice    59.  8.101 / 59.  8.101\r\n  libavfilter     8. 52.100 /  8. 52.100\r\n  libswscale      6.  8.112 /  6.  8.112\r\n  libswresample   4.  9.100 /  4.  9.100\r\n  libpostproc    56.  7.100 / 56.  7.100\r\nvideo=Integrated Webcam: No such file or directory\r\n'


  


  I have also tried with alternate name, but error is still same. I think error is with the arguments for ffprobe. How can I fix the arguments ?