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• Play mpeg-2 file with 608/708 embedded captions out Decklink SDI

  29 octobre 2022, par asperi

  I have built ffmpeg with decklink support, it plays my mpg file fine out the SDI but not seeing any captions on my works broadcast monitor (JVC DT-V17G1Z). This monitor shows captions on SDI from my Mojito card but trying to get it to work with a BlackMagic 4k extreme. The mpg file has embedded 608 and 708 captions. Using the to play-

  


  ffmpeg -i C:\video\RD2838_720p.mpg -f decklink -pix_fmt uyvy422 "DeckLink 4K Extreme"


  


  MediaInfo on captinos :

  


  Text #1


  


  ID : 4096 (0x1000)-CC1
Menu ID : 1 (0x1)
Format : EIA-608
Muxing mode : A/53 / DTVCC Transport
Muxing mode, more info : Muxed in Video #1
Duration : 28 min 30 s
Bit rate mode : Constant
Stream size : 0.00 Byte (0%)
Language : English
CaptionServiceName : CC1

  


  Text #2
ID : 4096 (0x1000)-1
Menu ID : 1 (0x1)
Format : EIA-708
Muxing mode : A/53 / DTVCC Transport
Muxing mode, more info : Muxed in Video #1
Duration : 28 min 30 s
Bit rate mode : Constant
Stream size : 0.00 Byte (0%)
Language : English

  


  How do I get the Decklink 4k to pass the captions ? Thanks !

  


• ffmpeg for video transcription [closed]

  22 juin 2023, par TSz

  Does ffmpeg have capabilities to generate a transcription from a video or an audio file in .srt format or other ? Task is to create subtitles for YT videos (30-60min long). Timestamps and duration would be important so the text is synchronized to the audio. Languages english and hungarian

  


  no code was tried yet

  


• Libavcodec decode ffmpeg Fuzz-testing

  20 juin 2016, par Marso

  I’m implementing a testing stub for libfuzzer. My purpose is to do some testing for libav and I’m currently trying to do it for ffmpeg codec. Testing stub has *data and size as arguments, which are data as file data and size as filze size. Purpose is to open ffmpeg file and decode it.

  I have read decode example from here :
  http://roxlu.com/2014/039/decoding-h264-and-yuv420p-playback

  I just have problems understanding how should I open and decode file. My code currently looks like this :

  #include 
  
  #include 
  
  #include 
  
  #include 
  
  
  
  extern "C" {
  
  #include "libavcodec/avcodec.h"
  
  #include "libavutil/avutil.h"
  
  }
  
  
  
  #define INBUF_SIZE 4096
  
  #define AUDIO_INBUF_SIZE 20480
  
  #define AUDIO_REFILL_THRESH 4096
  
  
  
  
  
  extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
  
    avcodec_register_all();
  
    AVCodec *codec;
  
    AVCodecContext *c= NULL;
  
    AVCodecParserContext* parser;
  
    uint8_t inbuf[AUDIO_INBUF_SIZE + FF_INPUT_BUFFER_PADDING_SIZE];
  
    FILE *f;
  
    AVPacket avpkt;
  
  
  
    codec = avcodec_find_decoder(AV_CODEC_ID_MP2);
  
    c = avcodec_alloc_context3(codec);
  
    parser = av_parser_init(AV_CODEC_ID_MP2);
  
  
  
    // decode file
  
  
  
  
  
    av_parser_close(parser);
  
    avcodec_close(c);
  
    av_free(c);
  
  
  
    return 0;
  
  }