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tests : do not use AVFrame accessor
22 avril 2017, par Muhammad Faiz -
UVC webcam with ffplay outputs only noise ?
1er mars 2024, par Abdulla Masud(My end goal is to use a UVC webcam with esp32 or raspberry pi. I was hoping to learn while doing some fun projects.)


I have an old UVC webcam (Creative model ct6840) but I can't seem to get it to work with
ffplay
. I have tried looking through the documentation and other questions here but nothing is working for me. So far I have only been able to achieve a noisy-jittery output.

Running
ffplay -f rawvideo -video_size 670x480 /dev/video1
, I get :



Can someone help me understand how to make the camera work with
ffplay
?

The following is the information of my webcam :


$ ffmpeg -f v4l2 -list_formats all -i /dev/video2


[video4linux2,v4l2 @ 0x17eb3c0] Compressed: Unsupported : GSPCA OV511 : 320x240 640x480



$ v4l-info /dev/video2


### v4l2 device info [/dev/video2] ###
general info
 VIDIOC_QUERYCAP
 driver : "ov519"
 card : "USB Camera (05a9:0511)"
 bus_info : "usb-0000:00:14.0-8.2"
 version : 6.1.79
 capabilities : 0x85200001 [VIDEO_CAPTURE,?,READWRITE,STREAMING,(null)]

standards

inputs
 VIDIOC_ENUMINPUT(0)
 index : 0
 name : "ov519"
 type : CAMERA
 audioset : 0
 tuner : 0
 std : 0x0 []
 status : 0x0 []

video capture
 VIDIOC_ENUM_FMT(0,VIDEO_CAPTURE)
 index : 0
 type : VIDEO_CAPTURE
 flags : 1
 description : "GSPCA OV511"
 pixelformat : 0x3131354f [O511]
 VIDIOC_G_FMT(VIDEO_CAPTURE)
 type : VIDEO_CAPTURE
 fmt.pix.width : 640
 fmt.pix.height : 480
 fmt.pix.pixelformat : 0x3131354f [O511]
 fmt.pix.field : NONE
 fmt.pix.bytesperline : 640
 fmt.pix.sizeimage : 614400
 fmt.pix.colorspace : JPEG
 fmt.pix.priv : 4276996862

controls
 VIDIOC_QUERYCTRL(BASE+0)
 id : 9963776
 type : INTEGER
 name : "Brightness"
 minimum : 0
 maximum : 255
 step : 1
 default_value : 127
 flags : 48
 VIDIOC_QUERYCTRL(BASE+1)
 id : 9963777
 type : INTEGER
 name : "Contrast"
 minimum : 0
 maximum : 255
 step : 1
 default_value : 127
 flags : 32
 VIDIOC_QUERYCTRL(BASE+2)
 id : 9963778
 type : INTEGER
 name : "Saturation"
 minimum : 0
 maximum : 255
 step : 1
 default_value : 127
 flags : 32
 VIDIOC_QUERYCTRL(BASE+24)
 id : 9963800
 type : MENU
 name : "Power Line Frequency"
 minimum : 0
 maximum : 2
 step : 1
 default_value : 0
 flags : 0
 VIDIOC_QUERYCTRL(BASE+32)
 id : 9963808
 type : BOOLEAN
 name : "Brightness, Automatic"
 minimum : 0
 maximum : 1
 step : 1
 default_value : 1
 flags : 8



Can someone guide me here please ? Any advice will be greatly appreciated


(P.S. the camera works perfectly with "guvcview" gtk application but since I want to use the camera with raspberry pi, I want it to work with ffplay...)


-
How to encode video with ffmpeg using AMD h264_amf
10 novembre 2022, par Ivy GrowingGiven :


- 

- Win10
- AMD CPU
- Video capturing card Avermedia Live Gamer Extreme 3
- ffmpeg versions and encoders :










>ffmpeg.exe -encoders | find "264"
ffmpeg version 5.1-full_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers
// cut
 V....D libx264 libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (codec h264)
 V....D libx264rgb libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 RGB (codec h264)
 V....D h264_amf AMD AMF H.264 Encoder (codec h264)
 V....D h264_mf H264 via MediaFoundation (codec h264)
 V....D h264_nvenc NVIDIA NVENC H.264 encoder (codec h264)
 V..... h264_qsv H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (Intel Quick Sync Video acceleration) (codec h264)



Required to capture the video into H.264 encoded file using AMD's hardware accelerator in the CPU (AMF, or VCE).
Tried :
ffmpeg -y -f dshow -rtbufsize 2002000k -framerate 30 -i video="Live Gamer EXTREME 3" -t 00:00:10 -c:v h264_amf output.ts

Result :

Input #0, dshow, from 'video=Live Gamer EXTREME 3':
 Duration: N/A, start: 88548.973998, bitrate: N/A
 Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422(tv, bt709/bt709/unknown), 1280x720, 30 fps, 30 tbr, 10000k tbn
Stream mapping:
 Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (h264_amf))
Press [q] to stop, [?] for help
[h264_amf @ 000002404328c700] DLL amfrt64.dll failed to open
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!



For some reason
ffmpeg
uses resolution1280x720
... When trying to specifiy the capture card resolution the following error appears :

>ffmpeg -y -f dshow -rtbufsize 2002000k -framerate 30 -video_size 3840x2160 -i video="Live Gamer EXTREME 3" -r 30 -t 00:00:10 -c:v h264_amf -f mpegts output.ts
//cut
[dshow @ 0000029d7c0f84c0] Could not set video options
video=Live Gamer EXTREME 3: I/O error



This is not unique error for Avermedia card. The same error appears with Dell web cam and for Magewell.


From this answer the extra flags to be used with
h264_amf
. I guessed the default values should be good enough. It seems something needs to be configured or initialized when using AMF/VCE.

The video encoding in software (without AMF) works just fine but loads the CPU. The goal is using dedicated hardware module and release computational power of the CPU for the other apps.


Command example will be appreciated.