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• avcodec/v4l2_context : don't reinit output queue on dynamic resolution change event

  4 janvier 2022, par Ming Qian

  avcodec/v4l2_context : don't reinit output queue on dynamic resolution change event
  Reference :
  
  linux/Documentation/userspace-api/media/v4l/dev-decoder.rst
  
      "During the resolution change sequence, the OUTPUT queue must remain
  
       streaming. Calling VIDIOC_STREAMOFF() on the OUTPUT queue would
  
       abort the sequence and initiate a seek.
       In principle, the OUTPUT queue operates separately from the CAPTURE
  
       queue and this remains true for the duration of the entire
  
       resolution change sequence as well."
  Reviewed-by : Andriy Gelman <andriy.gelman@gmail.com>
  
  Signed-off-by : Ming Qian <ming.qian@nxp.com>
  

  • [DH] libavcodec/v4l2_context.c

• 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