I've looked through lots of forums alredy but still without finding the solution for my problem. Here is the situation:
I've been trying to record video from an old external USB webcam (Media-Tech MT400 -> 0c45:6029) with
ffmpeg.
First thing I've tried was to run to try something that works for the built-in webcam):
Code:
ffmpeg -f v4l2 -i /dev/video1 test.avi
But that returned a following error:
Code:
Cannot find a proper format for codec 'none' (id 0), pixel format 'none' (id -1)
Here is what I get from
Code:
v4l2-ctl -d /dev/video1/ --all --list-formats-ext
Code:
Driver Info (not using libv4l2):
Driver name : sonixb
Card type : USB camera
Bus info : usb-0000:04:00.0-1
Driver version: 3.10.17
Capabilities : 0x85000001
Video Capture
Read/Write
Streaming
Device Capabilities
Device Caps : 0x05000001
Video Capture
Read/Write
Streaming
Priority: 2
Video input : 0 (sonixb: ok)
Format Video Capture:
Width/Height : 352/288
Pixel Format : 'S910'
Field : None
Bytes per Line: 352
Size Image : 126720
Colorspace : SRGB
Streaming Parameters Video Capture:
Frames per second: invalid (0/0)
Read buffers : 2
ioctl: VIDIOC_ENUM_FMT
Index : 0
Type : Video Capture
Pixel Format: 'S910'
Name : S910
Size: Discrete 160x120
Size: Discrete 176x144
Size: Discrete 320x240
Size: Discrete 352x288
Index : 1
Type : Video Capture
Pixel Format: 'BA81'
Name : BA81
Size: Discrete 160x120
Size: Discrete 176x144
Unfortunately that was not of much help to me, but I tried capturing webcam output with
VLC and recording it which.... WORKED!
I tried
Code:
ffmpeg -i vlc-record[...].avi
on VLC recording which returned following information:
Code:
Input #0, avi, from 'vlc-record-2015-02-05-05h22m52s-v4l2____dev_video1-.avi':
Duration: 00:00:01.58, start: 0.000000, bitrate: 26937 kb/s
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 352x288, 27671 kb/s, 22.10 tbr, 22.10 tbn, 22.10 tbc
I thought that was enough information (
rawvideo and
yuv420p) led to run
ffmpeg with following arguments (I have found
yuv4 using
ffmpeg -formats)
Code:
ffmpeg -f rawvideo -vcodec yuv4 -i /dev/video1 test.avi
The result was only slightly better than one that I saw after my first attempt:
Code:
[IMGUTILS @ 0x7fff497d3920] Picture size 0x0 is invalid
[rawvideo @ 0x9c4720] Could not find codec parameters for stream 0 (Video: yuv4, yuv420p, -4 kb/s): unspecified size
Consider increasing the value for the 'analyzeduration' and 'probesize' options
/dev/video1: could not find codec parameters
Again after some searching and several tries I added
-video_size cif option and.... it WORKED!!??
Well, not really...
Code:
Input #0, rawvideo, from '/dev/video1':
Duration: N/A, start: 0.000000, bitrate: 30412 kb/s
Stream #0:0: Video: yuv4, yuv420p, 352x288, 30412 kb/s, 25 tbr, 25 tbn, 25 tbc
Output #0, avi, to 'test.avi':
Metadata:
ISFT : Lavf55.19.104
Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 352x288, q=2-31, 200 kb/s, 25 tbn, 25 tbc
Stream mapping:
Stream #0:0 -> #0:0 (yuv4 -> mpeg4)
Press [q] to stop, [?] for help
frame= 13 fps=6.3 q=24.8 Lsize= 1064kB time=00:00:00.52 bitrate=16759.3kbits/s
video:1058kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.554114%
LED on webcam turned on as during capturing video with
VLC but all that was recorded was TV-like noise which I guess is a sign that rawdata is not decoded correctly.
So here I am after 10 hours - still without working solution - asking for your help.
Thanks in advance.
