Recherche avancée

Sur d’autres sites (12982)

• H264 - how to interpret encoded video data [closed]

  30 décembre 2024, par Ragdoll Car

  I would like to know how to interpret encoded video data by H.264 codec e.g. FFmpeg's AVPacket.data.

  


  Are there any good resources about that to study ?

  


  I've been looking for the Internet, but I didn't find any documentation about H.264 format.

  


• How to extract EPG data from a rec/ts file ?

  5 janvier 2016, par wolfrevo

  I need to extract the data stream of a rec/ts file.
  What I’ve tried until now is with avconv

  avconv -i filename.rec

  I get this output

  avconv version 0.8.17-6:0.8.17-1, Copyright (c) 2000-2014 the Libav developers
  
    built on Mar 15 2015 17:00:31 with gcc 4.7.2
  
    ...
  
  Input #0, mpegts, from 'filename.rec':
  
    Duration: 01:54:55.94, start: 74083.801633, bitrate: 400 kb/s
  
    ...
  
    Program 28479
  
      Metadata:
  
      ...
  
      Stream #0.0[0x475](ger): Audio: mp2, 48000 Hz, stereo, s16, 320 kb/s
  
      Stream #0.1[0x81a]: Data: [5][0][0][0] / 0x0005
  
      Stream #0.2[0x881]: Data: [11][0][0][0] / 0x000B
  
      ...

  AFIK the data stream contains the EPG information. Does it ?

  The following command

  avconv -i filename.rec -f ffmetadata metadata.txt

  outputs this to metadata.txt

  ;FFMETADATA1

  and with

  avconv -i filename.rec -map 0:1 -f ffmetadata metadata.txt

  I get the message Data stream encoding not supported yet (only streamcopy)

  The file filename.rechas following content which I would like to extract :

  

• Is there a way to send ffmpeg data directly to a TCP Client ?

  3 février 2021, par KosmosisDire

  I am using ffmpeg to send screen capture directly to a C# TCP server. However, due to some bug or technical limitation, the Quest 2 (my build device) cannot bind ports. (There is very little info regarding this bug online, but as far as I can tell I can't get around it). So I cannot have a C# server on the Quest, I must have a client on the quest to receive data. However, ffmpeg sends data as a TCP client. So I need ffmpeg to act as a server.

  


  I tried sending the data through a server on my computer that then sends the data to the C# client. But I get less than 1 fps with huge lag. Normally, I get a good 30 fps with low latency when sending directly to a server.

  


  So my question :

  


  Is there a way to get ffmpeg data directly to a client, or indirectly without increasing the latency ?

  


  Here is the ffmpeg command I am using :

  


  ffmpeg -f gdigrab -i desktop -pixel_format rgb8 -video_size 896x504 -vf scale=896:504 -framerate 5 -r 30 -f rawvideo tcp://127.0.0.1:846


  


  I can include code for my C# client and server attempts as well as the middleman server, if I need.

  


  Thanks for any help !