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• ffmpeg doesnt use all the pictures when creating a video

  9 septembre 2022, par Mikhael Karabas

  I have 75 pictures of the same size for an animation. named 0.png ... 74.png
when running ffmpeg to create a video out of them with 24 fps (commmand and log below) the resulting video instead of expected 75/24 = 3.125 sec. is 2.667 sec in lenght and consists only of first 64 frames(pictures), although ffmpeg tells it has processed 75 frames.
I have checked with

  


  ffmpeg -i output.webm out%%d.png - on the resulting video, it indeed exports 64 first frames and not the rest 11 of them.

  


  Cant undertand what am i doing wrong. please kindly advise.

  


  brief output below.

  


  complete log : https://drive.google.com/file/d/1_J7wLPU9PJZ7jztpiJ8g_bZKPZfiK02L/view?usp=sharing

  


  D:\ffmpeg\ffmpeg-64.exe -report -framerate 24 -f image2 -i %01d.png -c:v libvpx-vp9 -pix_fmt yuva420p -crf 10 -b:v 0 output.webm
ffmpeg started on 2022-09-09 at 19:03:15
Report written to "ffmpeg-20220909-190315.log"
Log level: 48
ffmpeg version 2021-12-17-git-b780b6db64-essentials_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 11.2.0 (Rev2, Built by MSYS2 project)
  configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
  libavutil      57. 11.100 / 57. 11.100
  libavcodec     59. 14.100 / 59. 14.100
  libavformat    59. 10.100 / 59. 10.100
  libavdevice    59.  0.101 / 59.  0.101
  libavfilter     8. 20.100 /  8. 20.100
  libswscale      6.  1.101 /  6.  1.101
  libswresample   4.  0.100 /  4.  0.100
  libpostproc    56.  0.100 / 56.  0.100
Input #0, image2, from '%01d.png':
  Duration: 00:00:03.13, start: 0.000000, bitrate: N/A
  Stream #0:0: Video: png, rgba(pc), 300x400, 24 fps, 24 tbr, 24 tbn
File 'output.webm' already exists. Overwrite? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (png (native) -> vp9 (libvpx-vp9))
Press [q] to stop, [?] for help
[libvpx-vp9 @ 000002dad505c8c0] v1.11.0-62-g7f45e94d9
Output #0, webm, to 'output.webm':
  Metadata:
    encoder         : Lavf59.10.100
  Stream #0:0: Video: vp9, yuva420p(tv, progressive), 300x400, q=2-31, 24 fps, 1k tbn
    Metadata:
      encoder         : Lavc59.14.100 libvpx-vp9
    Side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
frame=   75 fps=9.9 q=0.0 Lsize=    1056kB time=00:00:02.58 bitrate=3347.2kbits/s speed=0.342x
video:1036kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.942318%


  


• lavu/pixfmt : Update the description for AV_PIX_FMT_QSV

  17 novembre 2022, par Haihao Xiang

  lavu/pixfmt : Update the description for AV_PIX_FMT_QSV
  Since D3D11 was introduced for QSV in FFmpeg 5.0, there is an implied
  
  API/ABI change for user-supplied frames [1], hence update the
  
  description for AV_PIX_FMT_QSV.
  [1] https://ffmpeg.org/pipermail/ffmpeg-devel/2021-December/290444.html
  Signed-off-by : Haihao Xiang <haihao.xiang@intel.com>
  

  • [DH] libavutil/pixfmt.h

• The phenomenon of missing video data for the first part 1 to 2 seconds in streaming

  22 novembre 2022, par 양관식

  The phenomenon of missing video data for the first part (1 to 2 seconds) in streaming - ffmpeg
(specific hls live streaming, intermittent occurrence)
( I'm using it to check the frame (fps) )

  


  [root@ ]# ffmpeg -i http://live_streaming_url/PATH/definst/sample.stream/playlist.m3u8 -t 1 -f null -
frame= 5 fps=0.0 q=-0.0 Lsize=N/A time=00:00:01.00 bitrate=N/A speed=23.3x
video:3kB audio:188kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : unknown

  


  ---

  


  When monitoring is performed by setting it to -t 10 (playtime), about 1 second of the first part is omitted, and only the frames for the next 9 seconds are added up
There is a phenomenon that is measured.

  


  [root@streaming_monitoring_test ~]# ffmpeg -i http://live_streaming_url/PATH/_definst_/sample.stream/playlist.m3u8 -t 10 -f null -
ffmpeg version 4.4 Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 7 (GCC)
  configuration: --enable-demuxer=dash --enable-libxml2
**frame=  277 fps=134 q=-0.0 Lsize=N/A time=00:00:10.00 bitrate=N/A speed=4.84x    
video:145kB audio:1875kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown**

------------------------------------------------------------------------------------------------------



  


  The reason for missing video data in the front part is under investigation
As a solution, the problem seems to be resolved when monitoring is carried out by adjusting the playback start time (-ss).

  


  ffmpeg -i http://live_streaming_url/PATH/definst/sample.stream/playlist.m3u8 -ss 10 -t 1 -f null –
frame= 29 fps=7.2 q=-0.0 Lsize=N/A time=00:00:01.00 bitrate=N/A speed=0.249x
  
video:15kB audio:188kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : unknown

  


  ---

  


  but.... Why is the video data missing for the first part (1 to 2 seconds) checked ?

  


  thankyou...