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Sur d’autres sites (8939)

  • avcodec/v4l2_context : send start decode command after dynamic resolution change event

    4 janvier 2022, par Ming Qian
    avcodec/v4l2_context : send start decode command after dynamic resolution change event

    Fixes decoding of sample https://streams.videolan.org/ffmpeg/incoming/720p60.mp4
    
on RPi4 after kernel driver commit :
    
staging : bcm2835-codec : Format changed should trigger drain
    

    Reference :
    
linux/Documentation/userspace-api/media/v4l/dev-decoder.rst
    
    "A source change triggers an implicit decoder drain, similar to the
    
     explicit Drain sequence. The decoder is stopped after it completes.
    
     The decoding process must be resumed with either a pair of calls to
    
     VIDIOC_STREAMOFF and VIDIOC_STREAMON on the CAPTURE queue, or a call to
    
     VIDIOC_DECODER_CMD with the V4L2_DEC_CMD_START command."
    

    Reviewed-by : Andriy Gelman <andriy.gelman@gmail.com>
    
Signed-off-by : Ming Qian <ming.qian@nxp.com>
    • [DH] libavcodec/v4l2_context.c

  • h264 : Move start code search functions into separate source files.

    21 juillet 2014, par Ben Avison
    h264 : Move start code search functions into separate source files.

    This permits re-use with parsers for codecs which use similar start codes.
    

    Signed-off-by : Luca Barbato <lu_zero@gentoo.org>
    • [DH] configure
    • [DH] libavcodec/Makefile
    • [DH] libavcodec/arm/Makefile
    • [DH] libavcodec/arm/h264dsp_init_arm.c
    • [DH] libavcodec/arm/startcode.h
    • [DH] libavcodec/arm/startcode_armv6.S
    • [DH] libavcodec/h264_parser.c
    • [DH] libavcodec/h264dsp.c
    • [DH] libavcodec/h264dsp.h
    • [DH] libavcodec/startcode.c
    • [DH] libavcodec/startcode.h

  • ffmpeg - extract timecode start metadata from tmcd track to a drawtext filter

    3 mars 2015, par mwjb

    I have a Quicktime file with a timecode track. I’m encoding it to a new video codec and would like to burnin the timecode from timecode track. Setting the timecode manually isn’t an option as this will be used for many files with unique starting timecodes.

    This is the current work-in-progress ffmpeg command. Obviously I need to find a way to extract the metadate:timecode value and have this start the timecode count instead of the manual entry seen below :

    ffmpeg -i infile.mov -y -c:v mjpeg -qscale:v 4 -vendor ap10 -pix_fmt yuvj422p -s 1280x720 -vf drawtext="fontfile=thefont.ttf: timecode='01\:00\:00\:00': rate=24: fontsize=40: fontcolor=white: boxcolor=black: box=1: x=1700: y=80" outfile.mov

    The Timecode metadata is there in the Stream #0:1 track, as read by ffmpeg :

    ffmpeg version 2.5.2 Copyright (c) 2000-2014 the FFmpeg developers
    
  built on Jan  1 2015 20:24:48 with llvm-gcc 4.2.1 (LLVM build 2336.11.00)
    
configuration: --prefix=/Volumes/tempdisk/sw --as=yasm --enable-gpl --enable-pthreads --disable-ffplay --disable-ffserver --disable-shared --enable-static --enable-libvpx --disable-decoder=libvpx --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libx264 --enable-libx265 --enable-libxvid --enable-zlib --enable-avfilter --enable-fontconfig --enable-libfreetype --enable-libass --enable-libutvideo --enable-filters --enable-postproc --enable-runtime-cpudetect
    
libavutil      54. 15.100 / 54. 15.100
    
libavcodec     56. 13.100 / 56. 13.100
    
libavformat    56. 15.102 / 56. 15.102
    
libavdevice    56.  3.100 / 56.  3.100
    
libavfilter     5.  2.103 /  5.  2.103
    
libswscale      3.  1.101 /  3.  1.101
    
libswresample   1.  1.100 /  1.  1.100
    
libpostproc    53.  3.100 / 53.  3.100
    
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'infile.mov':
    
  Metadata:
    
major_brand     : qt  
    
minor_version   : 537199360
    
compatible_brands: qt  
    
creation_time   : 2015-03-02 22:06:00
    
timecode        : 06:00:00:00
    
Duration: 00:20:00.00, start: 0.000000, bitrate: 36175 kb/s
    
Stream #0:0(eng): Video: dnxhd (AVdn / 0x6E645641), yuv422p, 1920x1080, 36175 kb/s, 24 fps, 24 tbr, 24k tbn, 24k tbc (default)
    
Metadata:
    
  creation_time   : 2015-03-02 22:06:00
    
  handler_name    : Apple Alias Data Handler
    
  encoder         : Avid DNxHD Codec
    
Stream #0:1(eng): Data: none (tmcd / 0x64636D74) (default)
    
Metadata:
    
  creation_time   : 2015-03-02 22:06:58
    
  handler_name    : Apple Alias Data Handler
    
  timecode        : 06:00:00:00

    I came across this post ffmpeg and timecode from movie metadata which appeared to be on the same sort of track as I’m on. Would certainly appreciate some guidance on this. Many Thanks.

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