Recherche avancée

Sur d’autres sites (12225)

• How to encrypt video in code with FFmpeg ? [closed]

  15 octobre 2023, par Vivian Green

  I want to use FFmpeg to push some video through UDP protrol,and now I am trying to encrypy my connection.

  


  I find a command to do this thing, it seems like this :

  


  ffmpeg -i input.mp4 -c copy -f mpegts -encryption_scheme aes-128-cbc -encryption_key 0123456789ABCDEF0123456789ABCDEF -y udp://remote_address:port


  


  However,when I trying to do the thing in Qt, I found it difficult to finish !
I got some code on the website,but it never works :

  


  // 设置加密参数
AVDictionary *options = nullptr;
av_dict_set(&options, "encryption_scheme", "aes-128-cbc", 0);
av_dict_set(&options, "encryption_key", "0123456789ABCDEF0123456789ABCDEF", 0);
// 写入文件头
avformat_write_header(outputFormatContext, &options);


  


  How can I finish encrypt with FFmpeg in the code just like what I done in the CMD ?

  


  Really thanks for your answer !

  


• FFMPEG How to copy stream but limit upload bitrate

  16 octobre 2022, par user2028856

  I'm using the following command to copy a video stream and push it to an rtmp URL :

  


  ffmpeg -re -i "http://example.com/index.m3u8" -g 50 -c copy -bf 0 -b:v 2M -maxrate 2M -bufsize 1M -f flv "rtmp://example"


  


  I need to limit the upload bitrate to 2M since there are bandwidth limitations. However, when using -c copy FFMPEG seems to ignore the -maxrate limits.

  


  How can I set a maximum upload bitrate whilst still using -c copy ?

  


• ffmpeg mkv to mp4 conversion has color tint

  25 novembre 2020, par razvan

  I am recording the screen in a lossless format to have small CPU load

  


  ffmpeg -f gdigrab -framerate 30 -i desktop -vcodec libx264rgb -crf 0 -preset ultrafast rec.mkv
  
ffprobe rec.mkv

  


  Input #0, matroska,webm, from 'vid.mkv':
  Metadata:
    ENCODER         : Lavf58.64.100
  Duration: 00:00:29.67, start: 0.000000, bitrate: 2829 kb/s
    Stream #0:0: Video: h264 (High 4:4:4 Predictive), gbrp(pc, gbr/unknown/unknown, progressive), 1920x1200, 30 fps, 30 tbr, 1k tbn, 60 tbc (default)
    Metadata:
      ENCODER         : Lavc58.112.103 libx264rgb
      DURATION        : 00:00:29.666000000


  


  then I convert/compress it in mp4

  


  ffmpeg -i rec.mkv rec.mp4
  
ffprobe rec.mp4

  


  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'vid.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf58.64.100
  Duration: 00:00:29.67, start: 0.000000, bitrate: 326 kb/s
    Stream #0:0(und): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), gbrp(tv, gbr/unknown/unknown), 1920x1200, 248 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)


  


  but the resulting mp4 it is tinted by green and pink color (white areas are tinted green and dark areas are tinted pink)

  


  I have the same results on windows and ubuntu.
I am using latest git versions.

  


  Any idea how to properly convert this to mp4 ?