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• 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 ?

  


• avformat/movenc : allow writing out channel count in MP4 and 3GP

  7 février 2023, par Jan Ekström

  avformat/movenc : allow writing out channel count in MP4 and 3GP
  ISOBMFF (14496-12) made this field ('channelcount') in the
  
  AudioSampleEntry structure non-template¹ somewhere before the
  
  release of the 2022 edition. As for ETSI TS 126 244 AKA 3GPP
  
  file format (V16.1.0, 2020-10), it does not seem contain any
  
  references limiting the channelcount entry in AudioSampleEntry
  
  or in its own definition of EVSSampleEntry.
  fate-mov-mp4-chapters test had to be adjusted as it output a
  
  mono vorbis stream, which would now be properly marked as such
  
  in the container.
  1 : As per 14496-12 :
  
     Fields shown as “template” in the box descriptions are fields
  
     which are coded with a default value unless a derived
  
     specification defines their use and permits writers to use
  
     other values than the default.
  

  • [DH] libavformat/movenc.c
  • [DH] tests/ref/fate/mov-mp4-chapters

• PGS subtitle track is out of sync after extracting then adding to another video file

  23 décembre 2022, par Diericx

  I have the Japanese and English version of a show. I am attempting to extract the subtitles and audio from the English version and add them to the Japanese version.

  


  The video in both files seems to be exactly the same.

  


  Here is the info for the streams contained in the english file. When playing this source video file Track 2 subtitles seem to be almost empty while Track 1 contains all of them forced.

  


  Stream #0:1(eng): Audio: dts (DTS-HD MA), 48000 Hz, stereo, s32p (24 bit) (default)
    Metadata:
      title           : Stereo
      BPS-eng         : 1572054
      DURATION-eng    : 00:29:08.789333333
      NUMBER_OF_FRAMES-eng: 163949
      NUMBER_OF_BYTES-eng: 343648948
      SOURCE_ID-eng   : 001100
      _STATISTICS_WRITING_APP-eng: MakeMKV v1.17.2 darwin(arm64-release)
      _STATISTICS_WRITING_DATE_UTC-eng: 2022-12-18 02:20:00
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES SOURCE_ID
  Stream #0:2(eng): Audio: dts (DTS), 48000 Hz, stereo, fltp, 1536 kb/s
    Metadata:
      title           : Stereo
      BPS-eng         : 1509000
      DURATION-eng    : 00:29:08.789333333
      NUMBER_OF_FRAMES-eng: 163949
      NUMBER_OF_BYTES-eng: 329865388
      SOURCE_ID-eng   : 001100
      _STATISTICS_WRITING_APP-eng: MakeMKV v1.17.2 darwin(arm64-release)
      _STATISTICS_WRITING_DATE_UTC-eng: 2022-12-18 02:20:00
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES SOURCE_ID
  Stream #0:3(eng): Subtitle: hdmv_pgs_subtitle
    Metadata:
      BPS-eng         : 22140
      DURATION-eng    : 00:28:47.454895833
      NUMBER_OF_FRAMES-eng: 836
      NUMBER_OF_BYTES-eng: 4780741
      SOURCE_ID-eng   : 001200
      _STATISTICS_WRITING_APP-eng: MakeMKV v1.17.2 darwin(arm64-release)
      _STATISTICS_WRITING_DATE_UTC-eng: 2022-12-18 02:20:00
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES SOURCE_ID
  Stream #0:4(eng): Subtitle: hdmv_pgs_subtitle
    Metadata:
      BPS-eng         : 1770
      DURATION-eng    : 00:28:39.655437500
      NUMBER_OF_FRAMES-eng: 62
      NUMBER_OF_BYTES-eng: 380532
      SOURCE_ID-eng   : 001201
      _STATISTICS_WRITING_APP-eng: MakeMKV v1.17.2 darwin(arm64-release)
      _STATISTICS_WRITING_DATE_UTC-eng: 2022-12-18 02:20:00
      _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES SOURCE_ID


  


  I extract the english audio

  


  ffmpeg -i s01e01_ja.mkv \
-muxdelay 0 \
-map 0:1 \
-vn \
-acodec copy \
s01e01_en_audio.dts


  


  I extract the english subtitles

  


  ffmpeg -i s01e01_en.mkv \
-muxdelay 0 \
-map 0:3 \
-vn \
-c copy \
s01e01_en_sub.sup


  


  I add the english audio track to the japanese video

  


  ffmpeg -i s01e01_ja.mkv \
-i s01e01_en_audio.dts \
-muxdelay 0 \
-map 0 \
-map 1:a \
-c copy \
-shortest \
s01e01_en_ja.mkv


  


  And finally add the english subtitles to the new japanese video that contains english audio

  


  ffmpeg -i s01e01_en_ja.mkv \
-itsoffset 6 \
-i future_boy_conan_s01e01_en_sub.sup \
-muxdelay 0 \
-map 0 \
-map 1:s \
-c copy \
-shortest \
s01e01_en_ja_subs.mkv


  


  As you can see I need to offset the subtitles by 6 seconds in order to get the subtitles to sync with the audio. The english audio is in sync with the video.

  


  I do not know how to debug this in order to tell if the subtitles are extracted or injected incorrectly causing the time offset. Any help would be appreciated !