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• webm video - it can not be copy to cut a correct time part for ffmpeg command(without re-encode) [closed]

  15 March 2024, by DanielHsu

  Command Goal:

  


  

  1. fast copy video's part

  


  2. no re-encode with libvpx

  


  


  Linux command below:
ffmpeg -ss 00:01:00 -to 00:02:00 -i input.webm -c copy output.webm

  


  command's process details:

  


  ffmpeg version 6.1.1 Copyright (c) 2000-2023 the FFmpeg developers   built with gcc 9 (Ubuntu 9.4.0-1ubuntu1~20.04.1)   configuration:
--enable-libvpx   libavutil      58. 29.100 / 58. 29.100   libavcodec     60. 31.102 / 60. 31.102   libavformat    60. 16.100 / 60. 16.100   libavdevice    60.  3.100 / 60.  3.100   libavfilter     9. 12.100 / 
9. 12.100   libswscale      7.  5.100 /  7.  5.100   libswresample   4. 12.100 /  4. 12.100 Input #0, matroska,webm, from 'input.webm':   Metadata:
    title           : FFmpeg
    ENCODER         : Lavf58.29.100   Duration: 00:06:04.43, start: 0.000000, bitrate: 2487 kb/s   Stream #0:0: Video: vp8, yuv420p(tv, bt470bg/unknown/unknown, progressive), 1280x720, SAR 1:1 DAR 16:9, 1k tbr, 1k tbn (default)
    Metadata:
      DURATION        : 00:06:04.432000000 Output #0, webm, to 'output.webm':   Metadata:
    title           : FFmpeg
    encoder         : Lavf60.16.100   Stream #0:0: Video: vp8, yuv420p(tv, bt470bg/unknown/unknown, progressive), 1280x720 [SAR 1:1 DAR 16:9], q=2-31, 1k tbr, 1k tbn (default)
    Metadata:
      DURATION        : 00:06:04.432000000 Stream mapping:   Stream #0:0 -> #0:0 (copy) Press [q] to stop, [?] for help [out#0/webm @ 0x5609ee9bb840] video:35912kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.069370% size=   35937kB time=00:00:59.96 bitrate=4909.2kbits/s speed= 211x


  


  command usage's result:
output.webm always start from input.webm's 00:00:00 to end input.webm's 00:01:00
(it should be start from input.webm's 00:01:00 to end input.webm's 00:02:00 )

  


  input.webm format details from mediainfo tool :

  


  


  General Count : 331 Count of stream
of this kind : 1 Kind of stream
  
: General Kind of stream : General Stream
identifier : 0 Count of video streams
  
: 1 Video_Format_List : VP8
Video_Format_WithHint_List : VP8 Codecs Video
  
: VP8 Complete name :
pure_film/65ea641a4075c92236151349_video.webm Folder name
  
: pure_film File name extension :
65ea641a4075c92236151349_video.webm File name
  
: 65ea641a4075c92236151349_video File extension
  
: webm Format : WebM Format
  
: WebM Format/Url :
http://www.webmproject.org/ Format/Extensions usually used :
webm Commercial name : WebM Format version
  
: Version 2 Internet media type : video/webm File
size : 113301943 File size
  
: 108 MiB File size : 108 MiB File size
: 108 MiB File size : 108 MiB File size
: 108.1 MiB Duration : 364432 Duration
: 6 min 4 s Duration : 6 min 4 s 432
ms Duration : 6 min 4 s Duration
  
: 00:06:04.432 Duration : 00:06:04.432
Overall bit rate : 2487201 Overall bit rate
  
: 2 487 kb/s Stream size : 4801069 Stream
size : 4.58 MiB (4%) Stream size
  
: 5 MiB Stream size : 4.6 MiB Stream size
: 4.58 MiB Stream size : 4.579 MiB Stream
size : 4.58 MiB (4%) Proportion of this
stream : 0.04237 IsStreamable
  
: Yes Title : FFmpeg Movie name
  
: FFmpeg File last modification date : UTC 2024-03-08
01:41:47 File last modification date (local) : 2024-03-08
09:41:47 Writing application : Lavf58.29.100
Writing application : Lavf58.29.100 Writing
library : Lavf58.29.100 Writing library
  
: Lavf58.29.100

  


  Video Count : 377 Count of stream
of this kind : 1 Kind of stream
  
: Video Kind of stream : Video Stream
identifier : 0 StreamOrder
  
: 0 ID : 1 ID
  
: 1 Unique ID : 1 Format
  
: VP8 Format : VP8 Format/Url
  
: http://www.webmproject.org/ Commercial name
  
: VP8 Codec ID : V_VP8 Codec ID/Url
  
: http://www.webmproject.org/ Duration
  
: 364432.000000 Duration : 6 min 4 s
Duration : 6 min 4 s 432 ms Duration
  
: 6 min 4 s Duration : 00:06:04.432
Duration : 00:06:04.432 Bit rate
  
: 2381808 Bit rate : 2 382 kb/s Width
: 1280 Width : 1 280 pixels Height
: 720 Height : 720 pixels Pixel
aspect ratio : 1.000 Display aspect ratio
  
: 1.778 Display aspect ratio : 16:9 Frame rate
mode : VFR Frame rate mode
  
: Variable Color space : YUV Compression
mode : Lossy Compression mode
  
: Lossy Delay : 0 Delay
  
: 00:00:00.000 Delay, origin : Container
Delay, origin : Container Stream size
  
: 108500874 Stream size : 103 MiB (96%)
Stream size : 103 MiB Stream size
  
: 103 MiB Stream size : 103 MiB Stream
size : 103.5 MiB Stream size
  
: 103 MiB (96%) Proportion of this stream : 0.95763
Default : Yes Default
  
: Yes Forced : No Forced
  
: No colour_description_present : Yes
colour_description_present_Source : Container Color range
  
: Limited colour_range_Source : Container Matrix
coefficients : BT.470 System B/G
matrix_coefficients_Source : Container

  


  


  How to make the output.webm be in correct time range(00:01:00 00:02:00)????

  


• avformat/rcwtdec: add RCWT Closed Captions demuxer

  2 April 2024, by Marth64

  avformat/rcwtdec: add RCWT Closed Captions demuxer
  RCWT (Raw Captions With Time) is a format native to ccextractor,
  
  a commonly used OSS tool for processing 608/708 Closed Captions (CC).
  
  RCWT can be used to archive the original extracted CC bitstream.
  
  The muxer was added in January 2024. In this commit, add the demuxer.
  One can now demux RCWT files for rendering in ccaption_dec or interop
  
  with ccextractor (which produces RCWT). Using the muxer/demuxer combo,
  
  the CC bits can be kept for processing or rendering with either tool.
  
  This can be an effective way to backup an original CC stream, including
  
  format extensions like EIA-708 and overall original presentation.
  Signed-off-by: Marth64 <marth64@proxyid.net>
  

  • [DH] Changelog
  • [DH] doc/demuxers.texi
  • [DH] libavformat/Makefile
  • [DH] libavformat/allformats.c
  • [DH] libavformat/rcwtdec.c

• I have an MJPEG file decoded with the Intel® IPP JPEG encoder [8.1.42291], how can I convert it to MP4 using ffmpeg? [closed]

  8 March 2024, by Renan Aragão

  When trying to convert the MJPEG file with ffmpeg, it gives the following error: Output file #0 does not contain any stream.

  


  This is the complete output:

  


  .\ffmpeg.exe -init_hw_device qsv=intel,child_device=1 -filter_hw_device intel -i .\19a57e41-244c-45a4-af41-5069dd3cbe4a.tmp -an -vf "format=nv12,hwupload=extra_hw_frames=20" -c:v h264_qsv record.mp4 -y -loglevel verbose
ffmpeg version n5.0.1-5-g240d82f26e-20220613 Copyright (c) 2000-2022 the FFmpeg developers
  built with gcc 11.2.0 (crosstool-NG 1.24.0.533_681aaef)
  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-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 --disable-avisynth --enable-libdav1d --disable-libdavs2 --disable-libfdk-aac --enable-ffnvcodec --enable-cuda-llvm --disable-frei0r --enable-libgme --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-librist --enable-libtheora --enable-libvpx --enable-libwebp --enable-lv2 --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-librav1e --disable-librubberband --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libsvtav1 --enable-libtwolame --enable-libuavs3d --disable-libdrm --disable-vaapi --disable-libvidstab --enable-vulkan --enable-libshaderc --enable-libplacebo --disable-libx264 --disable-libx265 --disable-libxavs2 --disable-libxvid --enable-libzimg --enable-libzvbi --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-ldexeflags= --extra-libs=-lgomp --extra-version=20220613
  libavutil      57. 17.100 / 57. 17.100
  libavcodec     59. 18.100 / 59. 18.100
  libavformat    59. 16.100 / 59. 16.100
  libavdevice    59.  4.100 / 59.  4.100
  libavfilter     8. 24.100 /  8. 24.100
  libswscale      6.  4.100 /  6.  4.100
  libswresample   4.  3.100 /  4.  3.100
WARNING: defaulting child_device_type to AV_HWDEVICE_TYPE_DXVA2 for compatibility with old commandlines. This behaviour will be removed in the future. Please explicitly set device type via "-init_hw_device" option.
[AVHWDeviceContext @ 000001953dac2f40] Using D3D9Ex device.
[AVHWDeviceContext @ 000001953dac2a80] Initialize MFX session: API version is 1.35, implementation version is 1.35
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '.\19a57e41-244c-45a4-af41-5069dd3cbe4a.tmp':
  Metadata:
    major_brand     : mp42
    minor_version   : 0
    compatible_brands: mp42isom
    creation_time   : 2024-03-06T13:32:38.000000Z
  Duration: 00:00:00.00, bitrate: N/A
Output #0, mp4, to 'record.mp4':
Output file #0 does not contain any stream


  


  I try using ipp in python and dotnet, but idon't found sample code. I need convert MJPEG Intel IPP to mp4.