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• avcodec/v4l2_context : send start decode command after dynamic resolution change event

  4 janvier 2022, par Ming Qian

  avcodec/v4l2_context : send start decode command after dynamic resolution change event
  Fixes decoding of sample https://streams.videolan.org/ffmpeg/incoming/720p60.mp4
  
  on RPi4 after kernel driver commit :
  
  staging : bcm2835-codec : Format changed should trigger drain
  Reference :
  
  linux/Documentation/userspace-api/media/v4l/dev-decoder.rst
  
      "A source change triggers an implicit decoder drain, similar to the
  
       explicit Drain sequence. The decoder is stopped after it completes.
  
       The decoding process must be resumed with either a pair of calls to
  
       VIDIOC_STREAMOFF and VIDIOC_STREAMON on the CAPTURE queue, or a call to
  
       VIDIOC_DECODER_CMD with the V4L2_DEC_CMD_START command."
  Reviewed-by : Andriy Gelman <andriy.gelman@gmail.com>
  
  Signed-off-by : Ming Qian <ming.qian@nxp.com>
  

  • [DH] libavcodec/v4l2_context.c

• ffmpeg commands to concatenate different type and resolution videos into 1 video and can be played in android [duplicate]

  24 août 2021, par Aalap

  I want to concatinate 4 different videos of 4 different resolution and type into 1 video which can be played in android. I am using ffmpeg ported on android using https://github.com/guardianproject/android-ffmpeg

  



  So I have these 4 different types of videos
1)

  



  ./ffmpeg -i 1.mp4 
Video: h264 (High), yuv420p, 1920x1080, 16959 kb/s, 29.85 fps, 90k tbr, 90k tbn, 180k tbc
Audio: aac, 48000 Hz, stereo, s16, 106 kb/s


  



  2)

  



  ffmpeg -i 2.mp4
Video: h264 (Constrained Baseline), yuv420p, 640x480, 3102 kb/s, 29.99 fps, 90k tbr, 90k tbn, 180k tbc
Audio: aac, 48000 Hz, stereo, s16, 93 kb/s


  



  3)

  



  ffmpeg -i 3.3gp
Video: h263, yuv420p, 1408x1152 [PAR 12:11 DAR 4:3], 2920 kb/s, 15 fps, 15 tbr, 15360 tbn, 29.97 tbc
Audio: amrnb, 8000 Hz, 1 channels, flt, 12 kb/s


  



  4)

  



  ffmpeg -i 4.3gp
Video: h264 (High), yuv420p, 352x288 [PAR 12:11 DAR 4:3], 216 kb/s, 24 fps, 24 tbr, 24 tbn, 48 tbc


  



  Audio : aac, 44100 Hz, stereo, s16, 92 kb/s

  



  So I am converting them to mpegts using following commands

  



  ./ffmpeg -i 1.mp4 -c:v libx264 -vf scale=1920:1080 -r 60 -c:a aac -ar 48000 -b:a 160k -strict experimental -f mpegts 1.ts
./ffmpeg -i 2.mp4 -c:v libx264 -vf scale=1920:1080 -r 60 -c:a aac -ar 48000 -b:a 160k -strict experimental -f mpegts 2.ts
./ffmpeg -i 3.3gp -c:v libx264 -vf scale=1920:1080 -r 60 -c:a aac -ar 48000 -b:a 160k -strict experimental -f mpegts 3.ts
./ffmpeg -i 4.3gp -c:v libx264 -vf scale=1920:1080 -r 60 -c:a aac -ar 48000 -b:a 160k -strict experimental -f mpegts 4.ts


  



  then concatenating the .ts files into f.ts and then creating a final .mp4 file from it using

  



  cat 1.ts 2.ts 3.ts 4.ts > f.ts
./ffmpeg -i f.ts -c copy -bsf:a aac_adtstoasc output.mp4


  



  But my f.ts also doesnt seem to play correctly in VLC on linux, it plays first 2 mp4's video + audio and it plays last .3gp's audio only.(Same for output.mp4 too) Could you please help me in figuring out what am I missing ?

  



  Thanks in advance

  


• NodeMediaServer MP4 change default video resolution 540p

  11 août 2021, par Farooq Zaman

  I have setup a nginx RTMP server and the purpose is to store videos streamed from mobile devices in MP4 format for later analysis. Although mobile devices are streaming videos in 720p resolution NodeMediaServer always store video in 540p resolution. How can I change this behaviour ? Following is NodeMediaServer configuration :

  


  const nodeMediaServerConfig = {
  rtmp: {
    port: 1936,
    chunk_size: 60000,
    gop_cache: true,
    ping: 60,
    ping_timeout: 10,
  },
  http: {
    port: 8000,
    mediaroot: './media',
    allow_origin: '*',
  },
  trans: {
    ffmpeg: '/usr/bin/ffmpeg',
    tasks: [
      {
        app: 'live',
        vcParam: [
          "-c:v",
          "libx264",
          "-vf",
          "scale=720:-1",
          "-b:v",
          "2800k",
          "-bufsize",
          "4200k",
          "-preset",
          "fast",
        ],
        ac: 'aac',
        acParam:["-b:a", "128k", "-ar", 48000],
        mp4: true,
        mp4Flags: '[movflags=faststart]',
      },
    ],
  },
};


  


  Any help in this matter is highly appreciated.