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• Decoding VP8 On A Sega Dreamcast

  20 février 2011, par Multimedia Mike — Sega Dreamcast, VP8

  I got Google’s libvpx VP8 codec library to compile and run on the Sega Dreamcast with its Hitachi/Renesas SH-4 200 MHz CPU. So give Google/On2 their due credit for writing portable software. I’m not sure how best to illustrate this so please accept this still photo depicting my testbench Dreamcast console driving video to my monitor :

  
  
  

  Why ? Because I wanted to try my hand at porting some existing software to this console and because I tend to be most comfortable working with assorted multimedia software components. This seemed like it would be a good exercise.

  You may have observed that the video is blue. Shortest, simplest answer : Pure laziness. Short, technical answer : Path of least resistance for getting through this exercise. Longer answer follows.

  Update : I did eventually realize that the Dreamcast can work with YUV textures. Read more in my followup post.

  Process and Pitfalls
  libvpx comes with a number of little utilities including decode_to_md5.c. The first order of business was porting over enough source files to make the VP8 decoder compile along with the MD5 testbench utility.

  Again, I used the KallistiOS (KOS) console RTOS (aside : I’m still working to get modern Linux kernels compiled for the Dreamcast). I started by configuring and compiling libvpx on a regular desktop Linux system. From there, I was able to modify a number of configuration options to make the build more amenable to the embedded RTOS.
  
  I had to create a few shim header files that mapped various functions related to threading and synchronization to their KOS equivalents. For example, KOS has a threading library cleverly named kthreads which is mostly compatible with the more common pthread library functions. KOS apparently also predates stdint.h, so I had to contrive a file with those basic types.

  So I got everything compiled and then uploaded the binary along with a small VP8 IVF test vector. Imagine my surprise when an MD5 sum came out of the serial console. Further, visualize my utter speechlessness when I noticed that the MD5 sum matched what my desktop platform produced. It worked !

  Almost. When I tried to decode all frames in a test vector, the program would invariably crash. The problem was that the file that manages motion compensation (reconinter.c) needs to define MUST_BE_ALIGNED which compiles byte-wise block copy functions. This is necessary for CPUs like the SH-4 which can’t load unaligned data. Apparently, even ARM CPUs these days can handle unaligned memory accesses which is why this isn’t a configure-time option.

  Showing The Work
  I completed the first testbench application which ran the MD5 test on all 17 official IVF test vectors. The SH-4/Dreamcast version aces the whole suite.

  However, this is a video game console, so I had better be able to show the decoded video. The Dreamcast is strictly RGB— forget about displaying YUV data directly. I could take the performance hit to convert YUV -> RGB. Or, I could just display the intensity information (Y plane) rendered on a random color scale (I chose blue) on an RGB565 texture (the DC’s graphics hardware can also do paletted textures but those need to be rearranged/twiddled/swizzled).

  Results
  So, can the Dreamcast decode VP8 video in realtime ? Sure ! Well, I really need to qualify. In the test depicted in the picture, it seems to be realtime (though I wasn’t enforcing proper frame timings, just decoding and displaying as quickly as possible). Obviously, I wasn’t bothering to properly convert YUV -> RGB. Plus, that Big Buck Bunny test vector clip is only 176x144. Obviously, no audio decoding either.

  So, realtime playback, with a little fine print.

  On the plus side, it’s trivial to get the Dreamcast video hardware to upscale that little blue image to fullscreen.

  I was able to tally the total milliseconds’ worth of wall clock time required to decode the 17 VP8 test vectors. As you can probably work out from this list, when I try to play a 320x240 video, things start to break down.

  1. Processed 29 176x144 frames in 987 milliseconds.
  2. Processed 49 176x144 frames in 1809 milliseconds.
  3. Processed 49 176x144 frames in 704 milliseconds.
  4. Processed 29 176x144 frames in 255 milliseconds.
  5. Processed 49 176x144 frames in 339 milliseconds.
  6. Processed 48 175x143 frames in 2446 milliseconds.
  7. Processed 29 176x144 frames in 432 milliseconds.
  8. Processed 2 1432x888 frames in 2060 milliseconds.
  9. Processed 49 176x144 frames in 1884 milliseconds.
  10. Processed 57 320x240 frames in 5792 milliseconds.
  11. Processed 29 176x144 frames in 989 milliseconds.
  12. Processed 29 176x144 frames in 740 milliseconds.
  13. Processed 29 176x144 frames in 839 milliseconds.
  14. Processed 49 175x143 frames in 2849 milliseconds.
  15. Processed 260 320x240 frames in 29719 milliseconds.
  16. Processed 29 176x144 frames in 962 milliseconds.
  17. Processed 29 176x144 frames in 933 milliseconds.

• Using ffmpeg on Ubuntu, how can the audio and video from an audio-video USB capture device be recorded ?

  11 avril 2022, par BlandCorporation

  I have a USB audio-video capture device, something used to digitize video cassettes. I want to record both the video and audio from the device to a video file that has dimensions 720x576 and video codec H.264 and good audio quality.

  


  I am able to record video from the device using ffmpeg and I am able to see video from the device using MPlayer. I am able also to see that audio is being delivered from the device to the computer by looking at Input tab of the Sound Preferences window or by recording the audio using Audacity, however the audio gets delivered from the device apparently only when the video is being accessed using ffmpeg or MPlayer.

  


  I have tried to get ffmpeg to record the audio and I have tried to get MPlayer to play the audio and my efforts have not been successful.

  


  The device is "Pinnacle Dazzle DVC 90/100/101" (as returned by v4l2-ctl --list-devices). The sound cards listing shows it as "DVC100" :

  


  $ cat /proc/asound/cards 
 0 [PCH            ]: HDA-Intel - HDA Intel PCH
                      HDA Intel PCH at 0x601d118000 irq 171
 1 [DVC100         ]: USB-Audio - DVC100
                      Pinnacle Systems GmbH DVC100 at usb-0000:00:14.0-4, high speed
29 [ThinkPadEC     ]: ThinkPad EC - ThinkPad Console Audio Control
                      ThinkPad Console Audio Control at EC reg 0x30, fw N2LHT33W


  


  The PulseAudio listing for the device is as follows :

  


  $ pactl list cards short
0   alsa_card.pci-0000_00_1f.3  module-alsa-card.c
14  alsa_card.usb-Pinnacle_Systems_GmbH_DVC100-01   module-alsa-card.c


  


  The following ffmpeg command successfully records video, but records severely distorted, broken and out-of-sync audio :

  


  ffmpeg -y -f rawvideo -f alsa -thread_queue_size 2048 -ar 48000 -i hw:0 \
    -c:a aac -video_size 720x576 -pixel_format uyvy422 -i /dev/video2 out.mp4


  


  The following MPlayer command successfully displays the video but does not play the audio :

  


  mplayer -tv driver=v4l2:norm=PAL:device=/dev/video2:width=720:height=576 \
    -ao alsa:device=hw=1.0 -vf pp=lb tv://


  


  Now, when the above MPlayer command is running (not the ffmpeg command) and displaying the input video in a window, Audacity can be opened and set recording audio, and it records the audio from the device clearly and in good quality. While Audacity is doing this, the input device is listed in pavucontrol as "Dazzle DVC Audio Device Analogue Stereo". Equivalently, arecord can be used also to record the audio using the following command (with output shown) :

  


  $ arecord -vv -D plughw:DVC100 -fdat out.wav
Recording WAVE 'out.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
Plug PCM: Hardware PCM card 1 'DVC100' device 0 subdevice 0
Its setup is:
  stream       : CAPTURE
  access       : RW_INTERLEAVED
  format       : S16_LE
  subformat    : STD
  channels     : 2
  rate         : 48000
  exact rate   : 48000 (48000/1)
  msbits       : 16
  buffer_size  : 24000
  period_size  : 6000
  period_time  : 125000
  tstamp_mode  : NONE
  tstamp_type  : MONOTONIC
  period_step  : 1
  avail_min    : 6000
  period_event : 0
  start_threshold  : 1
  stop_threshold   : 24000
  silence_threshold: 0
  silence_size : 0
  boundary     : 6755399441055744000
  appl_ptr     : 0
  hw_ptr       : 0


  


  Looking at the output of arecord -L, I tried a variety of audio device input names with ffmpeg and none of them seemed to work. So, for example, I tried commands like the following :

  


  ffmpeg -y -f rawvideo -f alsa -i plughw:DVC100 \
    -video_size 720x576 -pixel_format uyvy422 -i /dev/video2 out.mp4


  


  And tried the following audio device names :

  


  plughw:DVC100
plughw:CARD=DVC100,DEV=0
hw:CARD=DVC100,DEV=0
plughw:CARD=DVC100
sysdefault:CARD=DVC100
iec958:CARD=DVC100,DEV=0
dsnoop:CARD=DVC100,DEV=0


  


  So, how might I get ffmpeg to record the audio successfully to the video file ? Is there some alternative approach to this problem ?

  


  ---

  


  EDIT : The relevant output from the command pactl list sources is as follows :

  


  Source #20
    State: SUSPENDED
    Name: alsa_input.usb-Pinnacle_Systems_GmbH_DVC100-01.analog-stereo
    Description: Dazzle DVC100 Audio Device Analogue Stereo
    Driver: module-alsa-card.c
    Sample Specification: s16le 2ch 48000Hz
    Channel Map: front-left,front-right
    Owner Module: 45
    Mute: no
    Volume: front-left: 99957 / 153% / 11.00 dB,   front-right: 99957 / 153% / 11.00 dB
            balance 0.00
    Base Volume: 35466 /  54% / -16.00 dB
    Monitor of Sink: n/a
    Latency: 0 usec, configured 0 usec
    Flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY 
    Properties:
        alsa.resolution_bits = "16"
        device.api = "alsa"
        device.class = "sound"
        alsa.class = "generic"
        alsa.subclass = "generic-mix"
        alsa.name = "USB Audio"
        alsa.id = "USB Audio"
        alsa.subdevice = "0"
        alsa.subdevice_name = "subdevice #0"
        alsa.device = "0"
        alsa.card = "1"
        alsa.card_name = "DVC100"
        alsa.long_card_name = "Pinnacle Systems GmbH DVC100 at usb-0000:00:14.0-4, high speed"
        alsa.driver_name = "snd_usb_audio"
        device.bus_path = "pci-0000:00:14.0-usb-0:4:1.1"
        sysfs.path = "/devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4:1.1/sound/card1"
        udev.id = "usb-Pinnacle_Systems_GmbH_DVC100-01"
        device.bus = "usb"
        device.vendor.id = "2304"
        device.vendor.name = "Pinnacle Systems, Inc."
        device.product.id = "021a"
        device.product.name = "Dazzle DVC100 Audio Device"
        device.serial = "Pinnacle_Systems_GmbH_DVC100"
        device.string = "front:1"
        device.buffering.buffer_size = "352800"
        device.buffering.fragment_size = "176400"
        device.access_mode = "mmap+timer"
        device.profile.name = "analog-stereo"
        device.profile.description = "Analogue Stereo"
        device.description = "Dazzle DVC100 Audio Device Analogue Stereo"
        alsa.mixer_name = "USB Mixer"
        alsa.components = "USB2304:021a"
        module-udev-detect.discovered = "1"
        device.icon_name = "audio-card-usb"
    Ports:
        analog-input-linein: Line In (priority: 8100)
    Active Port: analog-input-linein
    Formats:
        pcm


  


  I tested the name from this with ffmpeg (version 4.3.1, compiled with -enable-libpulse) in the following way :

  


  ffmpeg -y -f video4linux2 -f pulse \
    -i alsa_input.usb-Pinnacle_Systems_GmbH_DVC100-01.analog-stereo \
    -video_size 720x576 -pixel_format uyvy422 -i /dev/video2 out.mp4


  


  Unfortunately this hasn't worked.

  


• How to stream live-video display from a webcam using FFMPEG command on tcl version 8.0 and windows 7 ?

  27 juin 2019, par M. D. P

  I am working on project were i need to have the live video streaming.
  I am able to save the video using the command :

  proc a {}  { 
  
  exec ffmpeg -f dshow -rtbufsize 64M -i "video=Integrated Webcam" -s 1280x720 -f sdl2 -
  
  }
  
  a
  
  
  
  this is the current error:

  ffmpeg started on 2017-11-17 at 15:24:45
  
  Report written to "ffmpeg-20171117-152445.log"
  
  Command line:
  
  ffmpeg -f dshow -report -rtbufsize 64M -i "video=Integrated Webcam" -s 1280x720 -f sdl2 -
  
  ffmpeg version N-87353-g183fd30 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib
  
    libavutil      55. 76.100 / 55. 76.100
  
    libavcodec     57.106.101 / 57.106.101
  
    libavformat    57. 82.101 / 57. 82.101
  
    libavdevice    57.  8.101 / 57.  8.101
  
    libavfilter     6.105.100 /  6.105.100
  
    libswscale      4.  7.103 /  4.  7.103
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100
  
  Splitting the commandline.
  
  Reading option '-f' ... matched as option 'f' (force format) with argument 'dshow'.
  
  Reading option '-report' ... matched as option 'report' (generate a report) with argument '1'.
  
  Reading option '-rtbufsize' ... matched as AVOption 'rtbufsize' with argument '64M'.
  
  Reading option '-i' ... matched as input url with argument 'video=Integrated Webcam'.
  
  Reading option '-s' ... matched as option 's' (set frame size (WxH or abbreviation)) with argument '1280x720'.
  
  Reading option '-f' ... matched as option 'f' (force format) with argument 'sdl2'.
  
  Reading option '-' ... matched as output url.
  
  Finished splitting the commandline.
  
  Parsing a group of options: global .
  
  Applying option report (generate a report) with argument 1.
  
  Successfully parsed a group of options.
  
  Parsing a group of options: input url video=Integrated Webcam.
  
  Applying option f (force format) with argument dshow.
  
  Successfully parsed a group of options.
  
  Opening an input file: video=Integrated Webcam.
  
  [dshow @ 0000000000e06a40] Selecting pin Capture on video
  
  dshow passing through packet of type video size   614400 timestamp 5773900280000 orig timestamp 5773900274254 graph timestamp 5773900280000 diff 5746 Integrated Webcam
  
  [dshow @ 0000000000e06a40] All info found
  
  Input #0, dshow, from 'video=Integrated Webcam':
  
    Duration: N/A, start: 577390.028000, bitrate: N/A
  
      Stream #0:0, 1, 1/10000000: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 30 fps, 30 tbr, 10000k tbn, 10000k tbc
  
  Successfully opened the file.
  
  Parsing a group of options: output url -.
  
  Applying option s (set frame size (WxH or abbreviation)) with argument 1280x720.
  
  Applying option f (force format) with argument sdl2.
  
  Successfully parsed a group of options.
  
  Opening an output file: -.
  
  Successfully opened the file.
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> rawvideo (native))
  
  Press [q] to stop, [?] for help
  
  cur_dts is invalid (this is harmless if it occurs once at the start per stream)
  
  [rawvideo @ 0000000000d90be0] PACKET SIZE: 614400, STRIDE: 1280
  
  detected 4 logical cores
  
  dshow passing through packet of type video size   614400 timestamp 5773900600000 orig timestamp 5773900607587 graph timestamp 5773900600000 diff -7587 Integrated Webcam
  
  [graph 0 input from stream 0:0 @ 0000000000d96200] Setting 'video_size' to value '640x480'
  
  [graph 0 input from stream 0:0 @ 0000000000d96200] Setting 'pix_fmt' to value '1'
  
  [graph 0 input from stream 0:0 @ 0000000000d96200] Setting 'time_base' to value '1/10000000'
  
  [graph 0 input from stream 0:0 @ 0000000000d96200] Setting 'pixel_aspect' to value '0/1'
  
  [graph 0 input from stream 0:0 @ 0000000000d96200] Setting 'sws_param' to value 'flags=2'
  
  [graph 0 input from stream 0:0 @ 0000000000d96200] Setting 'frame_rate' to value '10000000/333333'
  
  [graph 0 input from stream 0:0 @ 0000000000d96200] w:640 h:480 pixfmt:yuyv422 tb:1/10000000 fr:10000000/333333 sar:0/1 sws_param:flags=2
  
  [scaler_out_0_0 @ 0000000000d967e0] Setting 'w' to value '1280'
  
  [scaler_out_0_0 @ 0000000000d967e0] Setting 'h' to value '720'
  
  [scaler_out_0_0 @ 0000000000d967e0] Setting 'flags' to value 'bicubic'
  
  [scaler_out_0_0 @ 0000000000d967e0] w:1280 h:720 flags:'bicubic' interl:0
  
  [AVFilterGraph @ 0000000000d94d40] query_formats: 4 queried, 3 merged, 0 already done, 0 delayed
  
  [scaler_out_0_0 @ 0000000000d967e0] w:640 h:480 fmt:yuyv422 sar:0/1 -> w:1280 h:720 fmt:yuyv422 sar:0/1 flags:0x4
  
  dshow passing through packet of type video size   614400 timestamp 5773900970000 orig timestamp 5773900940920 graph timestamp 5773900970000 diff 29080 Integrated Webcam
  
  dshow passing through packet of type video size   614400 timestamp 5773901240000 orig timestamp 5773901274253 graph timestamp 5773901240000 diff -34253 Integrated Webcam
  
  dshow passing through packet of type video size   614400 timestamp 5773901720000 orig timestamp 5773901607586 graph timestamp 5773901720000 diff 112414 Integrated Webcam
  
  dshow passing through packet of type video size   614400 timestamp 5773902040000 orig timestamp 5773901940919 graph timestamp 5773902040000 diff 99081 Integrated Webcam
  
  dshow passing through packet of type video size   614400 timestamp 5773902360000 orig timestamp 5773902274252 graph timestamp 5773902360000 diff 85748 Integrated Webcam
  
  dshow passing through packet of type video size   614400 timestamp 5773902680000 orig timestamp 5773902607585 graph timestamp 5773902680000 diff 72415 Integrated Webcam
  
  dshow passing through packet of type video size   614400 timestamp 5773903000000 orig timestamp 5773902940918 graph timestamp 5773903000000 diff 59082 Integrated Webcam
  
  dshow passing through packet of type video size   614400 timestamp 5773903320000 orig timestamp 5773903274251 graph timestamp 5773903320000 diff 45749 Integrated Webcam
  
  dshow passing through packet of type video size   614400 timestamp 5773903640000 orig timestamp 5773903607584 graph timestamp 5773903640000 diff 32416 Integrated Webcam
  
  [sdl,sdl2 @ 0000000000d911c0] w:1280 h:720 fmt:yuyv422 -> w:1280 h:720
  
  Output #0, sdl,sdl2, to 'pipe:':
  
    Metadata:
  
      encoder         : Lavf57.82.101
  
      Stream #0:0, 0, 333333/10000000: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1280x720, q=2-31, 442368 kb/s, 30 fps, 30 tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc57.106.101 rawvideo
  
  dshow passing through packet of type video size   614400 timestamp 5773903970000 orig timestamp 5773903940917 graph timestamp 5773903970000 diff 29083 Integrated Webcam
  
  dshow passing through packet of type video size   614400 timestamp 5773904280000 orig timestamp 5773904274250 graph timestamp 5773904280000 diff 5750 Integrated Webcam
  
  av_interleaved_write_frame(): Operation not permitted
  
  No more output streams to write to, finishing.
  
  dshow passing through packet of type video size   614400 timestamp 5773904660000 orig timestamp 5773904607583 graph timestamp 5773904660000 diff 52417 Integrated Webcam
  
  frame=    1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.03 bitrate=N/A speed=0.0797x    
  
  video:1800kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  Input file #0 (video=Integrated Webcam):
  
    Input stream #0:0 (video): 1 packets read (614400 bytes); 1 frames decoded; 
  
    Total: 1 packets (614400 bytes) demuxed
  
  Output file #0 (pipe:):
  
    Output stream #0:0 (video): 1 frames encoded; 1 packets muxed (1843200 bytes); 
  
    Total: 1 packets (1843200 bytes) muxed
  
  1 frames successfully decoded, 0 decoding errors
  
  dshow passing through packet of type video size        0 timestamp 5773907070000 orig timestamp 2644601806342528 graph timestamp 5773907070000 diff -2638827899272528 Integrated Webcam
  
  Conversion failed!

  % source c:/other/a/d.tcl
  
  couldn't execute "ffmpeg -f dshow -t 00:00:10 -i {video=Integrated Webcam} -b 5000k -s 1280x720 c:\test\sample-a.avi": no such file or directory
  
  % source c:/other/a/d.tcl
  
  invalid command name "ffmpeg"
  
  % source c:/other/a/d.tcl
  
  ffmpeg version N-87353-g183fd30 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib
  
    libavutil      55. 76.100 / 55. 76.100
  
    libavcodec     57.106.101 / 57.106.101
  
    libavformat    57. 82.101 / 57. 82.101
  
    libavdevice    57.  8.101 / 57.  8.101
  
    libavfilter     6.105.100 /  6.105.100
  
    libswscale      4.  7.103 /  4.  7.103
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100
  
  Input #0, dshow, from 'video=Integrated Webcam':
  
    Duration: N/A, start: 523220.045000, 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) -> rawvideo (native))
  
  Press [q] to stop, [?] for help
  
  Output #0, sdl,sdl2, to 'pipe:':
  
    Metadata:
  
      encoder         : Lavf57.82.101
  
      Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1280x720, q=2-31, 442368 kb/s, 30 fps, 30 tbn, 30 tbc
  
      Metadata:
  
        encoder         : Lavc57.106.101 rawvideo
  
  av_interleaved_write_frame(): Operation not permitted
  
  frame=    1 fps=0.0 q=-0.0 Lsize=N/A time=00:00:00.03 bitrate=N/A speed=0.0471x
  
  video:1800kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
  
  Conversion failed!
  
  %

  But, the problem is i don’t want to save the video, I just want to have live video streaming.

  link : https://trac.ffmpeg.org/wiki/StreamingGuide, provide the command for live video streaming, but it want work, the webcem gets started, but live video streaming is not displayed on screen.

  so, can any one help me out to get right "FFMPEG" command or even any TCL script, to get the live video streaming displayed on on my windows 7.

  ffplay started on 2017-11-17 at 12:44:40
  
  Report written to "ffplay-20171117-124440.log"
  
  Command line:
  
  ffplay -report C:/test/sample.avi
  
  ffplay version N-87353-g183fd30 Copyright (c) 2003-2017 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib
  
    libavutil      55. 76.100 / 55. 76.100
  
    libavcodec     57.106.101 / 57.106.101
  
    libavformat    57. 82.101 / 57. 82.101
  
    libavdevice    57.  8.101 / 57.  8.101
  
    libavfilter     6.105.100 /  6.105.100
  
    libswscale      4.  7.103 /  4.  7.103
  
    libswresample   2.  8.100 /  2.  8.100
  
    libpostproc    54.  6.100 / 54.  6.100
  
      nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0   
  
  [NULL @ 0000000002aea040] Opening 'C:/test/sample.avi' for reading
  
  [file @ 0000000002ae9c80] Setting default whitelist 'file,crypto'
  
  [avi @ 0000000002aea040] Format avi probed with size=2048 and score=100
  
  [avi @ 0000000002af30c0] use odml:1
  
  [avi @ 0000000002aea040] Before avformat_find_stream_info() pos: 5678 bytes read:107912 seeks:4 nb_streams:1
  
  [avi @ 0000000002aea040] All info found
  
  [avi @ 0000000002aea040] After avformat_find_stream_info() pos: 33035 bytes read:107912 seeks:4 frames:1
  
  Input #0, avi, from 'C:/test/sample.avi':
  
    Metadata:
  
      encoder         : Lavf57.82.101
  
    Duration: 00:00:10.00, start: 0.000000, bitrate: 5072 kb/s
  
      Stream #0:0, 1, 1/30: Video: mpeg4 (Simple Profile) (FMP4 / 0x34504D46), yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 5078 kb/s, 30 fps, 30 tbr, 30 tbn, 30 tbc
  
  detected 4 logical cores
  
      nan M-V:    nan fd=   0 aq=    0KB vq=  595KB sq=    0B f=0/0   
  
  Video frame changed from size:0x0 format:none serial:-1 to size:1280x720 format:yuv420p serial:1
  
  [ffplay_buffer @ 0000000003a17ee0] Setting 'video_size' to value '1280x720'
  
  [ffplay_buffer @ 0000000003a17ee0] Setting 'pix_fmt' to value '0'
  
  [ffplay_buffer @ 0000000003a17ee0] Setting 'time_base' to value '1/30'
  
  [ffplay_buffer @ 0000000003a17ee0] Setting 'pixel_aspect' to value '1/1'
  
  [ffplay_buffer @ 0000000003a17ee0] Setting 'frame_rate' to value '30/1'
  
  [ffplay_buffer @ 0000000003a17ee0] w:1280 h:720 pixfmt:yuv420p tb:1/30 fr:30/1 sar:1/1 sws_param:
  
  [AVFilterGraph @ 0000000002b14fc0] query_formats: 2 queried, 1 merged, 0 already done, 0 delayed