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• avcodec/v4l2_buffers : read height/width from the proper context

  30 août 2019, par Aman Gupta

  avcodec/v4l2_buffers : read height/width from the proper context
  Frames are generally dequeued into capture buffers, so using
  
  the output properties here was incorrect. It happened to work
  
  fine for decoding, since the output/capture buffers have the same
  
  dimensions.
  For the v4l2 scaler, the dimensions can be different between output
  
  and capture. Using the buffer's associated context makes this code
  
  work correctly regardless of where the frame is coming from.
  Signed-off-by : Aman Gupta <aman@tmm1.net>
  

  • [DH] libavcodec/v4l2_buffers.c

• FFMPEG - height not divisible by 2

  27 septembre 2019, par iSaBo

  i have an problem with ffmpeg. i would like to format a image sequence into a video. I use the followed command for this :

  ffmpeg -framerate 24 -i image%04d.jpeg Project.mp4 -vf "pad=ceil(iw/2)*2:ceil(ih/2)*2"

  i have 4 pictures :

  • image0001.jpeg
  • image0002.jpeg
  • image0003.jpeg
  • image0004.jpeg

  With this command, i get the following error :

  [libx264 @ 000001f12e7a0540] height not divisible by 2 (1200x1599) 
  
  Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe 
  
  incorrect parameters such as bit_rate, rate, width or height
  
  Conversion failed!

  Can someone tell me why this mistake comes and how can I fix it ?

  Thanks

• How to concatenate two or more videos with same width and different height in FFMpeg and to maintain the same aspect ratio ?

  25 octobre 2019, par Aarwil

  I have five video parts to concat all. Each five videos are in the same width and height. The second part is the hstack of another 2 videos and the third part is the hstack and vstack of another 3 videos. While concat all the five video parts the aspect ratio is not maintaining in the final video. Since I am new to ffmpeg help me to sort out the problem

  I have tried with the command in my final with filter complex and to reduce the size I used frame per second.

  "ffmpeg -i
final.mp4 -vf scale=1280:480 -filter:v fps=fps=30 finalNew.mp4"

  but nothing worked.
  Also help me to use hstack with scaling, to maintain the aspect ratio for the second part on below command

  Command : ffmpeg -i vid1.mkv -i vid2.mkv -filter_complex "[0:v]scale=-1:480[v0] ;[0:v][1:v]hstack=inputs=2"vid3.mkv

  Images

  second part

  third part

  videochunks

  I have console the info of my video

  ffmpeg -i part1.mkv -i part2.mkv -i part3.mkv -i part4.mkv -i part5.mkv
ffmpeg version N-94911-g197985c5bf Copyright (c) 2000-2019 the FFmpeg developers
 built with gcc 9.1.1 (GCC) 20190807
 configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
 libavutil      56. 35.100 / 56. 35.100
 libavcodec     58. 56.101 / 58. 56.101
 libavformat    58. 32.104 / 58. 32.104
 libavdevice    58.  9.100 / 58.  9.100
 libavfilter     7. 58.102 /  7. 58.102
 libswscale      5.  6.100 /  5.  6.100
 libswresample   3.  6.100 /  3.  6.100
 libpostproc    55.  6.100 / 55.  6.100
Input #0, matroska,webm, from 'part1.mkv':
 Metadata:
   ENCODER         : Lavf58.32.104
 Duration: 00:00:44.00, start: 0.000000, bitrate: 189 kb/s
   Stream #0:0(eng): Video: h264 (High), yuv420p(progressive), 640x480 [SAR 9:16 DAR 3:4], 30 fps, 30 tbr, 1k tbn, 60 tbc (default)
   Metadata:
     title           : Video
     ENCODER         : Lavc58.56.101 libx264
     DURATION        : 00:00:44.000000000
Input #1, matroska,webm, from 'part2.mkv':
 Metadata:
   ENCODER         : Lavf58.32.104
 Duration: 00:01:22.07, start: 0.000000, bitrate: 113 kb/s
   Stream #1:0: Video: h264 (High), yuv420p(progressive), 640x240 [SAR 9:16 DAR 3:2], 30 fps, 30 tbr, 1k tbn, 60 tbc (default)
   Metadata:
     ENCODER         : Lavc58.56.101 libx264
     DURATION        : 00:01:22.066000000
Input #2, matroska,webm, from 'part3.mkv':
 Metadata:
   ENCODER         : Lavf58.32.104
 Duration: 00:00:42.03, start: 0.000000, bitrate: 405 kb/s
   Stream #2:0: Video: h264 (High), yuv420p(progressive), 640x720 [SAR 9:16 DAR 1:2], 30 fps, 30 tbr, 1k tbn, 60 tbc (default)
   Metadata:
     ENCODER         : Lavc58.56.101 libx264
     DURATION        : 00:00:42.033000000
Input #3, matroska,webm, from 'part4.mkv':
 Metadata:
   ENCODER         : Lavf58.32.104
 Duration: 00:00:21.00, start: 0.000000, bitrate: 298 kb/s
   Stream #3:0: Video: h264 (High), yuv420p(progressive), 640x240 [SAR 9:16 DAR 3:2], 30 fps, 30 tbr, 1k tbn, 60 tbc (default)
   Metadata:
     ENCODER         : Lavc58.56.101 libx264
     DURATION        : 00:00:21.000000000
Input #4, matroska,webm, from 'part5.mkv':
 Metadata:
   ENCODER         : Lavf58.32.104
 Duration: 00:00:16.00, start: 0.000000, bitrate: 169 kb/s
   Stream #4:0(eng): Video: h264 (High), yuv420p(progressive), 640x480 [SAR 9:16 DAR 3:4], 30 fps, 30 tbr, 1k tbn, 60 tbc (default)
   Metadata:
     title           : Video
     ENCODER         : Lavc58.56.101 libx264
     DURATION        : 00:00:16.000000000