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• fftools/ffmpeg_enc : move fps conversion code to ffmpeg_filter

  24 juillet 2023, par Anton Khirnov

  fftools/ffmpeg_enc : move fps conversion code to ffmpeg_filter
  Its function is analogous to that of the fps filter, so filtering is a
  
  more appropriate place for this.
  The main practical reason for this move is that it places the encoding
  
  sync queue right at the boundary between filters and encoders. This will
  
  be important when switching to threaded scheduling, as the sync queue
  
  involves multiple streams and will thus need to do nontrivial
  
  inter-thread synchronization.
  In addition to framerate conversion, the closely-related
  
  * encoder timebase selection
  
  * applying the start_time offset
  
  are also moved to filtering.
  

  • [DH] fftools/ffmpeg.c
  • [DH] fftools/ffmpeg.h
  • [DH] fftools/ffmpeg_enc.c
  • [DH] fftools/ffmpeg_filter.c

• hwcontext_vulkan : add support for allocating all planes in a single allocation

  7 décembre 2021, par Wenbin Chen

  hwcontext_vulkan : add support for allocating all planes in a single allocation
  VAAPI on Intel can import external frame, but the planes of the external
  
  frames should be in the same drm object. A new option "contiguous_planes"
  
  is added to device. This flag tells device to allocate places in one
  
  memory. When device is derived from vaapi this flag will be enabled.
  
  A new flag frame_flag is also added to AVVulkanFramesContext. User
  
  can use this flag to force enable or disable this behaviour.
  
  A new variable "offset "is added to AVVKFrame. It describe describe the
  
  offset from the memory currently bound to the VkImage.
  Signed-off-by : Wenbin Chen <wenbin.chen@intel.com>
  
  Further-modifications-by : Lynne <dev@lynne.ee>
  

  • [DH] libavutil/hwcontext_vulkan.c
  • [DH] libavutil/hwcontext_vulkan.h

• What is the best way to capture a screenshot from a udp multicast stream ? [on hold]

  30 novembre 2017, par yash17

  Currently I’m capturing screenshot from an UDP multicast stream, playing in VLC,using ffmpeg from command line.

  Is there any other tool that can capture the screenshot,with best resolution ?

  edit :
  ffmpeg takes more 3 seconds to capture the screen.Mentioned Below is the log for the same.And I came to know that for streaming,ffmpeg can’t be faster.
  So is there any alternate way,that will help me capture screen instantaneously.

  log :

  ffmpeg version 3.3.2 Copyright (c) 2000-2017 the FFmpeg developers
  
  built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
  
  configuration: --extra-libs=-ldl --prefix=/opt/ffmpeg --mandir=/usr/share/man --enable-avresample --disable-debug --enable-nonfree --enable-gpl --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-decoder=amrwb --enable-libpulse --enable-libfreetype --enable-gnutls --enable-libx264 --enable-libx265 --enable-libfdk-aac --enable-libvorbis --enable-libtheora --enable-libmp3lame --enable-libopus --enable-libvpx --enable-libspeex --enable-libass --enable-avisynth --enable-libsoxr --enable-libxvid --enable-libvidstab --enable-libwavpack --enable-nvenc
  
  libavutil      55. 58.100 / 55. 58.100
  
  libavcodec     57. 89.100 / 57. 89.100
  
  libavformat    57. 71.100 / 57. 71.100
  
  libavdevice    57.  6.100 / 57.  6.100
  
  libavfilter     6. 82.100 /  6. 82.100
  
  libavresample   3.  5.  0 /  3.  5.  0
  
  libswscale      4.  6.100 /  4.  6.100
  
  libswresample   2.  7.100 /  2.  7.100
  
  libpostproc    54.  5.100 / 54.  5.100
  
  [mpeg2video @ 0x390cc60] Invalid frame dimensions 0x0.
  
  Last message repeated 7 times
  
  Input #0, mpegts, from 'udp://@xxx.xx.xx.xx:xxxx':
  
  Duration: N/A, start: 144.130744, bitrate: 4128 kb/s
  
  Program 1 
  
  Metadata:
  
    service_name    : Program-1   
  
    service_provider: Encoder 
  
  Stream #0:0[0x42]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, top first), 720x576 [SAR 16:15 DAR 4:3], 4000 kb/s, 25 fps, 25 tbr, 90k tbn, 50 tbc
  
  Stream #0:1[0x43]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, s16p, 128 kb/s
  
  Stream mapping:
  
  Stream #0:0 -> #0:0 (mpeg2video (native) -> png (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, image2, to 'player.png':
  
  Metadata:
  
  encoder         : Lavf57.71.100
  
  Stream #0:0: Video: png, rgb24, 720x576 [SAR 16:15 DAR 4:3], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
  
  Metadata:
  
    encoder         : Lavc57.89.100 png
  
  frame=    1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A dup=1 drop=1 speed=0.729x    
  
  video:777kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown