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• Adding HEVC reference decoder to ffmpeg framework

  4 mars 2014, par Zax

  I have a tweaked HM reference code of HEVC Decoder based on my requirements. I also know that FFMPEG version 2.1 onwards supports HEVC. But its a necessity for me to integrate my modified HM code.

  Hence I have gone through the post :

  http://wiki.multimedia.cx/index.php?title=FFmpeg_codec_howto

  According to this post, I need to define some functions that are needed to add a new decoder support to FFMPEG framework.

  The structure is : typedef struct AVCodec

  I have defined a structure as shown below :

  AVCodec HMHEVC_decoder =
  
  {
  
      .name           = "hmhevc",
  
      .type           = AVMEDIA_TYPE_VIDEO,
  
      .id             = AV_CODEC_ID_HMHEVC,
  
  
  
      .init           = hmhevc_decode_init,
  
      .close          = hmhevc_decode_close,
  
      .decode         = hmhevc_decode_frame,
  
  };

  However, looking at the other examples, I feel I have to add another variable like :

      .priv_data_size = sizeof(HEVCContext),

  But the problem is that I don't have any such context. So in case I don't define this, what are the things that FFMPEG framework wont provide my decoder ?

  Also is definition of this private data context compulsary ?

  What are the other fields that have to be compulsorily defined ?

  My main intention is that FFPLAY should be able to play the decoded frame.

• Input seeking for frame at specified timestamp with Py-AV

  9 décembre 2019, par neonScarecrow

  I have a project already using Py-AV and am trying to replicate a specific ffmpeg command. The goal is to get a frame roughly around the specified timestamp.

  Here’s the ffmpeg commmand :
  https://trac.ffmpeg.org/wiki/Seeking

  ffmpeg -ss 14 -i https://some_url.mp4 -frames:v 1 frame_at_14_seconds.jpg

  Here’s my code :

      #return one frame around 14 seconds into the movie
  
      target_sec = 14 
  
      container = av.open('https://some_url.mp4', 'r')
  
      container.streams.video[0].thread_type = 'AUTO'
  
      video_stream = next(s for s in container.streams if s.type == 'video')
  
      time_base = float(video_stream.time_base)
  
      target_timestamp = int(target_sec / time_base) + video_stream.start_time
  
      video_stream.seek(target_timestamp)
  
      for frame in container.decode(video_stream):
  
          frame.to_image().save('frame_at_14_seconds.jpg')
  
          break

  Additionally, I have found any documentation about this, but does anyone know if either command (ffmpeg/av.open) is downloading the entire file to a tmp file behind the scenes. I’m looking for a less memory-intensive way to read a frame for every second in an up to 60 second video.

• how too download this link with ffmpeg

  27 décembre 2020, par Behrad kabiri

  i want download video with this command in ffmpeg :

  


  ffmpeg -i https://msx.namava.ir/hvod/2020/12/e9936676-eea2-44bd-b17b-dc5e58fd000d/v_854.mp4/index-v1-a1.m3u8?x=EgvsRR7zZLXNoaz49v4D05BwcjHwPaNSOtkB9y98QGOIB_EyAhV_hc44Z4McLT_FTwzBWxpaK1WlNgSBkLd415LU1jRGz0yFNhciw_SDSwgj6OlAQCARiRIb9UU8XMh_dMXKr4KncBfgwnYLMOlUn6zfSa3ltot63vKiuw0CUpU1 -vcodec copy output.mp4

  


  but recive this eror :

  


  [https @ 00000242dbcfeec0] HTTP error 420
https://msx.namava.ir/hvod/2020/12/e9936676-eea2-44bd-b17b-dc5e58fd000d/v_854.mp4/index-v1-a1.m3u8?x=EgvsRR7zZLXNoaz49v4D05BwcjHwPaNSOtkB9y98QGOIB_EyAhV_hc44Z4McLT_FTwzBWxpaK1WlNgSBkLd415LU1jRGz0yFNhciw_SDSwgj6OlAQCARiRIb9UU8XMh_dMXKr4KncBfgwnYLMOlUn6zfSa3ltot63vKiuw0CUpU1 : Server returned 4XX Client Error, but not one of 400,1,3,4

  


  please help me