SVEN IC-350 webcam and ffmpeg - I/O error

[Viacheslav]

Hello everyone,

Could you tell me - is it possible to capture video from the SVEN IC-350 webcam via ffmpeg?

ffmpeg succesfully displays the options:

PS D:\temp> & ffmpeg -list_options true -f dshow -i video="USB2.0 Camera"
ffmpeg version 4.3.2-2021-02-27-essentials_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.2.0 (Rev6, 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      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
[dshow @ 000001f953e0d640] DirectShow video device options (from video devices)
[dshow @ 000001f953e0d640]  Pin "Запись" (alternative pin name "0")
[dshow @ 000001f953e0d640]   pixel_format=yuyv422  min s=640x480 fps=30 max s=640x480 fps=30
[dshow @ 000001f953e0d640]   pixel_format=yuyv422  min s=640x480 fps=30 max s=640x480 fps=30
[dshow @ 000001f953e0d640]   pixel_format=yuyv422  min s=160x120 fps=30 max s=160x120 fps=30
[dshow @ 000001f953e0d640]   pixel_format=yuyv422  min s=160x120 fps=30 max s=160x120 fps=30
[dshow @ 000001f953e0d640]   pixel_format=yuyv422  min s=320x240 fps=30 max s=320x240 fps=30
[dshow @ 000001f953e0d640]   pixel_format=yuyv422  min s=320x240 fps=30 max s=320x240 fps=30
[dshow @ 000001f953e0d640]   pixel_format=yuyv422  min s=176x144 fps=30 max s=176x144 fps=30
[dshow @ 000001f953e0d640]   pixel_format=yuyv422  min s=176x144 fps=30 max s=176x144 fps=30
[dshow @ 000001f953e0d640]   pixel_format=yuyv422  min s=352x288 fps=30 max s=352x288 fps=30
[dshow @ 000001f953e0d640]   pixel_format=yuyv422  min s=352x288 fps=30 max s=352x288 fps=30

However, I can't capture video from it, every time I get I/O error:

PS D:\temp> & ffmpeg -f dshow -video_size 320x240 -i video="USB2.0 Camera" usb20cam.mp4 -y
ffmpeg version 4.3.2-2021-02-27-essentials_build-www.gyan.dev Copyright (c) 2000-2021 the FFmpeg developers
  built with gcc 10.2.0 (Rev6, 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      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
Input #0, dshow, from 'video=USB2.0 Camera':
  Duration: N/A, bitrate: N/A
    Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 320x240, 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=USB2.0 Camera: I/O error
[libx264 @ 0000028e11bcf3c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 0000028e11bcf3c0] profile High 4:2:2, level 1.3, 4:2:2, 8-bit
[libx264 @ 0000028e11bcf3c0] 264 - core 161 r3048 b86ae3c - H.264/MPEG-4 AVC codec - Copyleft 2003-2021 - 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=6 lookahead_threads=1 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 'usb20cam.mp4':
  Metadata:
    encoder         : Lavf58.45.100
    Stream #0:0: Video: h264 (libx264) (avc1 / 0x31637661), yuv422p, 320x240, q=-1--1, 30 fps, 10000k tbn, 30 tbc
    Metadata:
      encoder         : Lavc58.91.100 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

At the same time, the camera correctly works in Skype, in the built-in Camera app in Windows, etc.
Changing ffmpeg version doesn't help.
Is there a solution for ffmpeg?
Thanks in advance.

[poisondeathray]

video=USB2.0 Camera: I/O error

Is camera concurrently being accessed by other applications ? If so, shut them down and try again

Do you have permission to write to D:\temp ? Try another path location to write

[Viacheslav]

poisondeathray, thank you for the response.

No, the camera is not busy, all apps are closed.
Tried to change output folder to Documents in my profile - no effect.