Recherche avancée

Sur d’autres sites (14610)

• Strange libavformat dependency with Jackmp

  13 avril 2015, par Martin Delille

  I try to execute my application on another Mac than my development machine and I have the following error :

  Dyld Error Message:
  
      Library not loaded: /System/Library/Framework/Versions/A/Jackmp
  
      Referenced from: /Volumes/FFmpegTest_v1.0.1/FFmpegTest.app/Contents/Frameworks/libavformat.56.dylib

  It seems that this Jackmp library is a new dependency (not present in earlier libavformat dependencies) as I can check with :

  otool -L /usr/local/lib/libavformat.dylib

  Any idea ?

• ffmpeg converted mp4 files won't play on videojs

  11 février 2018, par Ricky

  I am trying to convert an hls source to mp4 but the ouputted file won’t play on any internet video players. Currently I am using videojs

  here is how I am converting it.

  ffmpeg -re -i "https://mnmedias.api.telequebec.tv/m3u8/29880.m3u8" -c:v libx264 -c:a copy -movflags +faststart ./public/videos/cut-videos/knife/parlet.mp4

  the video player is outputting this :

  video.js:498 VIDEOJS : ERROR : (CODE:4 MEDIA_ERR_SRC_NOT_SUPPORTED) The media could not be loaded, either because the server or network failed or because the format is not supported.

• Detect if an interlaced video frame is the Top or Bottom field ?

  21 décembre 2024, par Danny

  I'm decoding video PES packets (packetized elementary stream) containing H.264/AVC and H.265/HEVC using libavcodec like this :

  


  while (remainingESBytes > 0)
{
    int bytesUsed = av_parser_parse2(
            mpParser, mpDecContext,
            &mpEncPacket->data, &mpEncPacket->size,
            pIn, remainingESBytes,
            AV_NOPTS_VALUE, AV_NOPTS_VALUE, 0);

    // send encoded packet for decoding
    int ret = avcodec_send_packet(mpDecContext, mpEncPacket);
    if (ret < 0)
    {
        // failed
        continue;
    }

    while (ret >= 0)
    {
        ret = avcodec_receive_frame(mpDecContext, mpDecFrame);
        /// Do stuff with frame ///
    }

    remainingESBytes = getMoreBytes()
}


  


  Sometimes the input video is interlaced, in which case it seems avcodec_receive_frame is returning individual fields and not a merged frame of the top and bottom fields together.

  


  I couldn't find any way for avcodec_receive_frame to emit a full, non-interlaced frame.

  


  I can merge a top and bottom field together but I haven't found any way to identify if a given AVFrame is top or bottom.

  


  How can I do that ?

  


  EDIT I

  


  Looking at the log output from the decoder, it appears the decoder knows if the field is top or bottom (carried by SEI ?) but still can't figure out how to access that information via the libavcodec API...

  


  [hevc @ 0x1afcfc0] ENTER DECODE NAL TYPE 39. sei.ni_custom.type = -1
[hevc @ 0x1afcfc0] Set sei.ni_custom.type to -1.
[hevc @ 0x1afcfc0] ff_hevc_decode_nal_sei - s->ni_custom.type = -1
[hevc @ 0x1afcfc0] Decoding SEI [NAL Type 39]. ni_custom.type=-1
[hevc @ 0x1afcfc0] TOP Field
[hevc @ 0x1afcfc0] EXIT DECODE NAL TYPE 39. sei.ni_custom.type = -1