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• Speed up start of a stream recording with ffmpeg

  12 mai 2021, par neutron

  I try to record a video stream (from the web or a local webcam stream) and save it to a .mp4 / .flv file. I use FFmpeg with the version"N-59696-gc0a33c4".

  



  The problem isn't the recording of the stream, it is, how log it tooks to start the recording.

  



  This are the parameters i used to capture the stream (the stream is some random stream I found on the web) :

  



  ffmpeg.exe -i mmsh://live.camstreams.com/cscamscape?MSWMExt=.asf -r 25 -t 60 C:\temp\video.mp4


  



  And leads to this output :

  



  ffmpeg.exe -i mmsh://live.camstreams.com/cscams
cape?MSWMExt=.asf -r 25 -t 60 C:\temp\video.mp4
ffmpeg version N-59696-gc0a33c4 Copyright (c) 2000-2014 the FFmpeg developers
  built on Jan  8 2014 22:01:50 with gcc 4.8.2 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
eex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aa
cenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavp
ack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  libavutil      52. 62.100 / 52. 62.100
  libavcodec     55. 47.100 / 55. 47.100
  libavformat    55. 22.102 / 55. 22.102
  libavdevice    55.  5.102 / 55.  5.102
  libavfilter     4.  0.103 /  4.  0.103
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
[wmv3 @ 0275db40] Extra data: 8 bits left, value: 0
Input #0, asf, from 'mmsh://live.camstreams.com/cscamscape?MSWMExt=.asf':
  Metadata:
    title           : Live Fish Cam
    WMFSDKNeeded    : 0.0.0.0000
    DeviceConformanceTemplate: SP
    WMFSDKVersion   : 11.0.5721.5275
    IsVBR           : 0
  Duration: N/A, start: 3887858.274000, bitrate: 512 kb/s
    Stream #0:0(eng): Video: wmv3 (Simple) (WMV3 / 0x33564D57), yuv420p, 640x360
, 512 kb/s, 62.50 tbr, 1k tbn, 1k tbc
[libx264 @ 0275e400] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0275e400] profile High, level 3.0
[libx264 @ 0275e400] 264 - core 140 r2377 1ca7bb9 - H.264/MPEG-4 AVC codec - Cop
yleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deb
lock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 m
e_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chro
ma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1
interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1
 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scene
cut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin
=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
[wmv3 @ 0275db40] Extra data: 8 bits left, value: 0
Output #0, mp4, to 'C:\temp\video.mp4':
  Metadata:
    title           : Live Fish Cam
    WMFSDKNeeded    : 0.0.0.0000
    DeviceConformanceTemplate: SP
    WMFSDKVersion   : 11.0.5721.5275
    IsVBR           : 0
    encoder         : Lavf55.22.102
    Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 6
40x360, q=-1--1, 12800 tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (wmv3 -> libx264)
Press [q] to stop, [?] for help
frame=  148 fps=0.0 q=28.0 size=     228kB time=00:00:03.60 bitrate= 518.3kbits/
frame=  151 fps=117 q=28.0 size=     236kB time=00:00:03.72 bitrate= 519.2kbits/
frame=  178 fps= 91 q=28.0 size=     298kB time=00:00:04.80 bitrate= 508.3kbits/
frame=  204 fps= 64 q=28.0 size=     347kB time=00:00:05.84 bitrate= 487.4kbits/
... 
... And so on ...


  



  The problem now is, that it takes around 6-10 seconds until the recording starts after I entered the command.

  



  Is there a way to speed up this process ?

  


• FFmpeg recording works on one laptop but not the other

  30 novembre 2019, par Jason T

  The following command :

  ffmpeg -f dshow -framerate 30 -video_size 640x480 -i video="HD Pro Webcam C920" out.mp4​

  works on one laptop (with C920 LogiTech camera) (Im calling it GOOD LAPTOP). It outputs a recorded video. But it will fail on another laptop (called BAD LAPTOP) and by fail on another I mean - it doesnt output a video (see below for output).

  The suggestions are to change parameters based on the specific error that occur on BAD LAPTOP. I have tried many different suggestions but they dont seem to work. Furthermore, they dont provide much insight into the underlying cause of the problem.

  Ive used the same camera on both laptops. Im using static windows binaries downloaded from FFmpeg web-site (veranoe). Please note the versions used below were different but that doesnt appear to matter.

  Trying to diagnose. Anyone have an idea of where the problem may lie. It seems to indicate a problem at the level of the system / camera setup.

  Please note that I’ve updated BAD LAPTOP but still no dice. Also please note that Ive tried this on several systems already and it seems to run ok (i.e., produce an output video)

  BAD LAPTOP :

  $ ffmpeg -y -f dshow -framerate 30 -video_size 640x480 -t 10 -i video="HD Pro Webcam C920" out.mp4
  
  ffmpeg version git-2019-11-26-59d264b Copyright (c) 2000-2019 the FFmpeg developers
  
    built with gcc 9.2.1 (GCC) 20191125
  
    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. 36.100 / 56. 36.100
  
    libavcodec     58. 62.100 / 58. 62.100
  
    libavformat    58. 35.100 / 58. 35.100
  
    libavdevice    58.  9.101 / 58.  9.101
  
    libavfilter     7. 67.100 /  7. 67.100
  
    libswscale      5.  6.100 /  5.  6.100
  
    libswresample   3.  6.100 /  3.  6.100
  
    libpostproc    55.  6.100 / 55.  6.100
  
  Input #0, dshow, from 'video=HD Pro Webcam C920':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 30 fps, 30 tbr, 10000k tbn, 10000k tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
  
  Press [q] to stop, [?] for help
  
  video=HD Pro Webcam C920: I/O error
  
  [libx264 @ 06cb7a00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
  
  [libx264 @ 06cb7a00] profile High 4:2:2, level 3.0, 4:2:2, 8-bit
  
  [libx264 @ 06cb7a00] 264 - core 158 - H.264/MPEG-4 AVC codec - Copyleft 2003-2019 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
  
  Output #0, mp4, to 'out.mp4':
  
    Metadata:
  
      encoder         : Lavf58.35.100
  
      Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv422p, 640x480, q=-1--1, 30 fps, 10000k tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc58.62.100 libx264
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
  
  frame=    0 fps=0.0 q=0.0 Lsize=       0kB time=00:00:00.00 bitrate=N/A speed=   0x
  
  video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown

  GOOD LAPTOP :
  ​

  $ ffmpeg -y -f dshow -framerate 30 -video_size 640x480 -t 10 -i video="Logitech HD Pro Webcam C920" out.mp4   
  
  ffmpeg version N-92780-gbb586a9703 Copyright (c) 2000-2018 the FFmpeg developers                              
  
    built with gcc 8.2.1 (GCC) 20181201                                                                         
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-ico
  
  nv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --en
  
  able-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-lib
  
  soxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx
  
  264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvi
  
  dstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enabl
  
  e-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enab
  
  le-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt                                                 
  
    libavutil      56. 25.100 / 56. 25.100                                                                      
  
    libavcodec     58. 42.104 / 58. 42.104                                                                      
  
    libavformat    58. 25.100 / 58. 25.100                                                                      
  
    libavdevice    58.  6.101 / 58.  6.101                                                                      
  
    libavfilter     7. 46.101 /  7. 46.101                                                                      
  
    libswscale      5.  4.100 /  5.  4.100                                                                      
  
    libswresample   3.  4.100 /  3.  4.100                                                                      
  
    libpostproc    55.  4.100 / 55.  4.100                                                                      
  
  Input #0, dshow, from 'video=Logitech HD Pro Webcam C920':                                                    
  
    Duration: N/A, start: 35609.500000, bitrate: N/A                                                            
  
      Stream #0:0: Video: mjpeg (Baseline) (MJPG / 0x47504A4D), yuvj422p(pc, bt470bg/unknown/unknown), 640x480, 
  
  30 fps, 30 tbr, 10000k tbn, 10000k tbc                                                                        
  
  Stream mapping:                                                                                               
  
    Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))                                                      
  
  Press [q] to stop, [?] for help                                                                               
  
  [libx264 @ 000001ec0b750100] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2            
  
  [libx264 @ 000001ec0b750100] profile High 4:2:2, level 3.0, 4:2:2, 8-bit                                      
  
  [libx264 @ 000001ec0b750100] 264 - core 157 r2935 545de2f - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http
  
  ://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 ps
  
  y_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma
  
  _qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 con
  
  strained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 k
  
  eyint_min=25 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 
  
  qpstep=4 ip_ratio=1.40 aq=1:1.00                                                                              
  
  Output #0, mp4, to 'out.mp4':                                                                                 
  
    Metadata:                                                                                                   
  
      encoder         : Lavf58.25.100                                                                           
  
      Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuvj422p(pc), 640x480, q=-1--1, 30 fps, 10000k tbn
  
  , 30 tbc                                                                                                      
  
      Metadata:                                                                                                 
  
        encoder         : Lavc58.42.104 libx264                                                                 
  
      Side data:                                                                                                
  
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: -1                                            
  
  frame=   62 fps= 31 q=29.0 size=       0kB time=00:00:00.10 bitrate=   3.8kbits/s dup=1 drop=0 speed=0.0495x  
  
  frame=   77 fps= 30 q=29.0 size=       0kB time=00:00:00.60 bitrate=   0.6kbits/s dup=1 drop=0 speed=0.237x   
  
  frame=   92 fps= 30 q=29.0 size=       0kB time=00:00:01.09 bitrate=   0.3kbits/s dup=1 drop=0 speed=0.363x   
  
  frame=  107 fps= 30 q=29.0 size=       0kB time=00:00:01.59 bitrate=   0.2kbits/s dup=1 drop=0 speed=0.453x   
  
  frame=  168 fps= 30 q=29.0 size=     256kB time=00:00:03.63 bitrate= 577.3kbits/s dup=1 drop=0 speed=0.654x   
  
  frame=  183 fps= 30 q=29.0 size=     256kB time=00:00:04.13 bitrate= 507.5kbits/s dup=1 drop=0 speed=0.683x   
  
  frame=  198 fps= 30 q=29.0 size=     256kB time=00:00:04.63 bitrate= 452.7kbits/s dup=1 drop=0 speed=0.706x   
  
  frame=  213 fps= 30 q=29.0 size=     512kB time=00:00:05.13 bitrate= 817.1kbits/s dup=1 drop=0 speed=0.727x   
  
  frame=  228 fps= 30 q=29.0 size=     512kB time=00:00:05.63 bitrate= 744.6kbits/s dup=1 drop=0 speed=0.744x   
  
  frame=  243 fps= 30 q=29.0 size=     512kB time=00:00:06.13 bitrate= 683.9kbits/s dup=1 drop=0 speed=0.759x   
  
  frame=  259 fps= 30 q=29.0 size=     512kB time=00:00:06.66 bitrate= 629.2kbits/s dup=1 drop=0 speed=0.777x   
  
  frame=  274 fps= 30 q=29.0 size=     512kB time=00:00:07.16 bitrate= 585.3kbits/s dup=1 drop=0 speed=0.789x   
  
  frame=  289 fps= 30 q=29.0 size=     512kB time=00:00:07.66 bitrate= 547.1kbits/s dup=1 drop=0 speed=0.799x   
  
  frame=  301 fps= 30 q=-1.0 Lsize=     973kB time=00:00:09.93 bitrate= 802.7kbits/s dup=1 drop=0 speed=0.975x  
  
  
  
  video:969kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.445649%            
  
  [libx264 @ 000001ec0b750100] frame I:4     Avg QP:24.23  size: 13237                                          
  
  [libx264 @ 000001ec0b750100] frame P:77    Avg QP:24.67  size:  7807                                          
  
  [libx264 @ 000001ec0b750100] frame B:220   Avg QP:26.09  size:  1534                                          
  
  [libx264 @ 000001ec0b750100] consecutive B-frames:  2.3%  0.7%  0.0% 97.0%                                    
  
  [libx264 @ 000001ec0b750100] mb I  I16..4: 19.6% 70.5%  9.9%                                                  
  
  [libx264 @ 000001ec0b750100] mb P  I16..4:  3.6%  3.3%  0.3%  P16..4: 54.9% 11.7%  9.5%  0.0%  0.0%    skip:16
  
  .8%                                                                                                           
  
  [libx264 @ 000001ec0b750100] mb B  I16..4:  0.1%  0.2%  0.0%  B16..8: 28.2%  1.1%  0.2%  direct: 7.9%  skip:62
  
  .2%  L0:51.0% L1:45.9% BI: 3.1%                                                                               
  
  [libx264 @ 000001ec0b750100] 8x8 transform intra:56.1% inter:69.3%                                            
  
  [libx264 @ 000001ec0b750100] coded y,uvDC,uvAC intra: 35.2% 85.0% 30.8% inter: 9.3% 38.8% 1.5%                
  
  [libx264 @ 000001ec0b750100] i16 v,h,dc,p: 32% 34%  8% 27%                                                    
  
  [libx264 @ 000001ec0b750100] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 33% 18% 28%  2%  3%  5%  3%  5%  3%               
  
  [libx264 @ 000001ec0b750100] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 40% 19%  8%  3%  6% 11%  4%  6%  3%               
  
  [libx264 @ 000001ec0b750100] i8c dc,h,v,p: 48% 16% 31%  5%                                                    
  
  [libx264 @ 000001ec0b750100] Weighted P-Frames: Y:3.9% UV:1.3%                                                
  
  [libx264 @ 000001ec0b750100] ref P L0: 39.0%  6.6% 38.0% 16.3%  0.1%                                          
  
  [libx264 @ 000001ec0b750100] ref B L0: 61.8% 30.3%  7.9%                                                      
  
  [libx264 @ 000001ec0b750100] ref B L1: 84.4% 15.6%                                                            
  
  [libx264 @ 000001ec0b750100] kb/s:790.62                 

• libav ffmpeg - streaming from both a mkv and input stream

  20 janvier 2020, par kealist

  I am trying to use ffmpeg libraries in C# with AutoGen bindings. The overall issue is that I am taking a collection of sources, some streams, and some .mkv containing recordings of a stream. As for now, they are all h264 and only video. For input streams, I am able to adjust the packets and broad cast them and that works fine, but any time I try to call av_interleaved_write_frame with packets from the MKV file, I get the error Error occurred: Invalid data found when processing input.

  Here is the main loop, where the error happens for mkv files. Is there an extra step ?

  /* read all packets */
  
  while (true)
  
  {
  
      if ((ret = ffmpeg.av_read_frame(ifmt_ctx, &packet)) < 0)
  
      {
  
          Console.WriteLine("Unable to read packet");
  
          break;
  
      }
  
      stream_index = (uint)packet.stream_index;
  
      type = ifmt_ctx->streams[packet.stream_index]->codecpar->codec_type;
  
      Console.WriteLine($"Demuxer gave frame of stream_index %{stream_index}");
  
  
  
  
  
      /* remux this frame without reencoding */
  
      ffmpeg.av_packet_rescale_ts(&packet,
  
          ifmt_ctx->streams[stream_index]->time_base,
  
          ofmt_ctx->streams[stream_index]->time_base);
  
  
  
      if (packet.stream_index < 0)
  
      {
  
          Console.WriteLine("Packet stream error");
  
      }
  
  
  
  
  
  
  
      ret = ffmpeg.av_write_frame(ofmt_ctx, &packet);
  
      if (ret < 0)
  
      {
  
          goto end;
  
      }
  
      else
  
      {
  
          ffmpeg.av_packet_unref(&packet);
  
      }
  
  }

  Anything need to be different for MKV files ?

  I get some contradictory error output where it claims it is annex b but also isn’t :

  [AVBSFContext @ 00000220eb657080] The input looks like it is Annex B already
  
  Automatically inserted bitstream filter 'h264_mp4toannexb'; args=''
  
  [mpegts @ 00000220ebace300] H.264 bitstream malformed, no startcode found, use the video bitstream filter 'h264_mp4toannexb' to fix it ('-bsf:v h264_mp4toannexb' option with ffmpeg)

  Verbose output from ffplay from an MKV file :

  ffplay version git-2020-01-13-7225479 Copyright (c) 2003-2020 the FFmpeg developers
  
    built with gcc 9.2.1 (GCC) 20200111
  
    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. 38.100 / 56. 38.100
  
    libavcodec     58. 65.103 / 58. 65.103
  
    libavformat    58. 35.102 / 58. 35.102
  
    libavdevice    58.  9.103 / 58.  9.103
  
    libavfilter     7. 71.100 /  7. 71.100
  
    libswscale      5.  6.100 /  5.  6.100
  
    libswresample   3.  6.100 /  3.  6.100
  
    libpostproc    55.  6.100 / 55.  6.100
  
  Initialized direct3d renderer.
  
  [h264 @ 00000165ed18d140] Reinit context to 640x480, pix_fmt: yuv444p
  
  Input #0, matroska,webm, from '.\webcam_14_Test1.mkv':   0B f=0/0
  
    Metadata:
  
      ENCODER         : Lavf58.12.100
  
    Duration: 00:00:39.30, start: 0.000000, bitrate: 1943 kb/s
  
      Stream #0:0: Video: h264 (High 4:4:4 Predictive), 1 reference frame, yuv444p(progressive, left), 640x480 [SAR 1:1 DAR 4:3], 1k fps, 30 tbr, 1k tbn, 60 tbc (default)
  
      Metadata:
  
        DURATION        : 00:00:39.299000000
  
  [h264 @ 00000165f424e200] Reinit context to 640x480, pix_fmt: yuv444p
  
  [ffplay_buffer @ 00000165f52ea840] w:640 h:480 pixfmt:yuv444p tb:1/1000 fr:30/1 sar:1/1
  
  [auto_scaler_0 @ 00000165ed1d2c80] w:iw h:ih flags:'bicubic' interl:0
  
  [ffplay_buffersink @ 00000165f424ef00] auto-inserting filter 'auto_scaler_0' between the filter 'ffplay_buffer' and the filter 'ffplay_buffersink'
  
  [auto_scaler_0 @ 00000165ed1d2c80] w:640 h:480 fmt:yuv444p sar:1/1 -> w:640 h:480 fmt:yuv420p sar:1/1 flags:0x4
  
  Created 640x480 texture with SDL_PIXELFORMAT_IYUV.
  
  [AVIOContext @ 00000165ed179a40] Statistics: 9547965 bytes read, 0 seeks