[FFmpeg-user] Grabbing quality from TV card

[tovis]

Hi Rodney!
Much better, but not good enough :(
Quality is still wrong, does not change against the very old Debianized
version. On time I have a lot of error messages:
$ ffmpeg -v verbose -f video4linux2 -i /dev/video0 -s 640x480 -r 25
out10.avi 2>&1 | tee ffmpeg-grab.log

The log looks like this:
ffmpeg version N-38750-g599888a Copyright (c) 2000-2012 the FFmpeg developers
  built on Mar 12 2012 23:50:31 with gcc 4.4.5
  configuration: --enable-nonfree --enable-libv4l2
  libavutil      51. 42.100 / 51. 42.100
  libavcodec     54. 10.100 / 54. 10.100
  libavformat    54.  2.100 / 54.  2.100
  libavdevice    53.  4.100 / 53.  4.100
  libavfilter     2. 64.101 /  2. 64.101
  libswscale      2.  1.100 /  2.  1.100
  libswresample   0.  7.100 /  0.  7.100
[video4linux2,v4l2 @ 0x30f13e0] [3]Capabilities: 5010015
[video4linux2,v4l2 @ 0x30f13e0] Querying the device for the current frame
size
[video4linux2,v4l2 @ 0x30f13e0] Setting frame size to 320x240
libv4l2: error dequeuing buf: Resource temporarily unavailable
  -- repeated 1174 times --
libv4l2: error dequeuing buf: Resource temporarily unavailable
[video4linux2,v4l2 @ 0x30f13e0] Estimating duration from bitrate, this may
be inaccurate
Input #0, video4linux2,v4l2, from '/dev/video0':
  Duration: N/A, start: 1331666886.562734, bitrate: 23040 kb/s
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 320x240,
23040 kb/s, 25 tbr, 1000k tbn, 25 tbc
[buffer @ 0x30f9020] w:320 h:240 pixfmt:yuv420p tb:1/1000000 sar:0/1
sws_param:
[scale @ 0x30f6e40] w:320 h:240 fmt:yuv420p -> w:640 h:480 fmt:yuv420p
flags:0x4
Output #0, avi, to 'out10.avi':
  Metadata:
    ISFT            : Lavf54.2.100
    Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 640x480,
q=2-31, 200 kb/s, 25 tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo -> mpeg4)
Press [q] to stop, [?] for help
libv4l2: error dequeuing buf: Resource temporarily unavailable
  -- repeated 44 times --
libv4l2: error dequeuing buf: Resource temporarily unavailable
frame=   18 fps=0.0 q=31.0 size=     183kB time=00:00:00.72
bitrate=2081.3kbits/s
libv4l2: error dequeuing buf: Resource temporarily unavailable
  -- repeated 44 times --
libv4l2: error dequeuing buf: Resource temporarily unavailable
frame=   31 fps= 29 q=31.0 size=     202kB time=00:00:01.24
bitrate=1333.2kbits/s
libv4l2: error dequeuing buf: Resource temporarily unavailable
  -- repeated 44 times --
libv4l2: error dequeuing buf: Resource temporarily unavailable
frame=   44 fps= 28 q=31.0 size=     220kB time=00:00:01.76
bitrate=1025.8kbits/s
libv4l2: error dequeuing buf: Resource temporarily unavailable
  -- repeated 44 times --
libv4l2: error dequeuing buf: Resource temporarily unavailable
frame=   57 fps= 27 q=31.0 size=     239kB time=00:00:02.28 bitrate=
858.0kbits/s
libv4l2: error dequeuing buf: Resource temporarily unavailable
  -- repeated 44 times --
libv4l2: error dequeuing buf: Resource temporarily unavailable
frame=   70 fps= 27 q=31.0 size=     255kB time=00:00:02.80 bitrate=
745.1kbits/s
libv4l2: error dequeuing buf: Resource temporarily unavailable
  -- repeated 44 times --
libv4l2: error dequeuing buf: Resource temporarily unavailable
frame=   83 fps= 26 q=31.0 size=     272kB time=00:00:03.32 bitrate=
672.0kbits/s
libv4l2: error dequeuing buf: Resource temporarily unavailable
  -- repeated 44 times --
libv4l2: error dequeuing buf: Resource temporarily unavailable
frame=   96 fps= 26 q=31.0 size=     290kB time=00:00:03.84 bitrate=
619.7kbits/s
libv4l2: error dequeuing buf: Resource temporarily unavailable
  -- repeated 44 times --
libv4l2: error dequeuing buf: Resource temporarily unavailable
frame=  109 fps= 26 q=24.8 size=     312kB time=00:00:04.36 bitrate=
586.2kbits/s
libv4l2: error dequeuing buf: Resource temporarily unavailable
  -- repeated 44 times --
libv4l2: error dequeuing buf: Resource temporarily unavailable
frame=  122 fps= 26 q=31.0 size=     331kB time=00:00:04.88 bitrate=
555.1kbits/s
libv4l2: error dequeuing buf: Resource temporarily unavailable
  -- repeated 44 times --
libv4l2: error dequeuing buf: Resource temporarily unavailable
frame=  135 fps= 26 q=31.0 size=     349kB time=00:00:05.40 bitrate=
530.0kbits/s
libv4l2: error dequeuing buf: Resource temporarily unavailable
  -- repeated 44 times --
libv4l2: error dequeuing buf: Resource temporarily unavailable
frame=  148 fps= 26 q=31.0 size=     366kB time=00:00:05.92 bitrate=
506.9kbits/s
libv4l2: error dequeuing buf: Resource temporarily unavailable
  -- repeated 44 times --
libv4l2: error dequeuing buf: Resource temporarily unavailable
frame=  161 fps= 26 q=31.0 size=     386kB time=00:00:06.44 bitrate=
490.5kbits/s
libv4l2: error dequeuing buf: Resource temporarily unavailable
  -- repeated 44 times --
libv4l2: error dequeuing buf: Resource temporarily unavailable
frame=  174 fps= 26 q=31.0 size=     403kB time=00:00:06.96 bitrate=
474.8kbits/s
libv4l2: error dequeuing buf: Resource temporarily unavailable
  -- repeated 44 times --
libv4l2: error dequeuing buf: Resource temporarily unavailable
frame=  187 fps= 26 q=31.0 size=     419kB time=00:00:07.48 bitrate=
458.5kbits/s
libv4l2: error dequeuing buf: Resource temporarily unavailable
  -- repeated 44 times --
libv4l2: error dequeuing buf: Resource temporarily unavailable
frame=  200 fps= 26 q=31.0 size=     438kB time=00:00:08.00 bitrate=
448.8kbits/s
libv4l2: error dequeuing buf: Resource temporarily unavailable
  -- repeated 44 times --
libv4l2: error dequeuing buf: Resource temporarily unavailable
frame=  213 fps= 26 q=31.0 size=     454kB time=00:00:08.52 bitrate=
436.7kbits/s
libv4l2: error dequeuing buf: Resource temporarily unavailable
  -- repeated 44 times --
libv4l2: error dequeuing buf: Resource temporarily unavailable
frame=  226 fps= 26 q=31.0 size=     468kB time=00:00:09.04 bitrate=
424.0kbits/s
libv4l2: error dequeuing buf: Resource temporarily unavailable
  -- repeated 15 times --
libv4l2: error dequeuing buf: Resource temporarily unavailable
frame=  230 fps= 25 q=31.0 Lsize=     480kB time=00:00:09.20 bitrate=
427.2kbits/s
video:469kB audio:0kB global headers:0kB muxing overhead 2.358736%

May be I should not have to compile with libv4l2? What is bother me that
may be I should have to set another input? Any farther suggestions?

Sincerely
  tovis

> On Tue, 13 Mar 2012 09:42:03 tovis wrote:
>> Hi Rodney!
>> Thanks for your quick answer.
>> I have built another system install development packages (headers gcc
>> make
>> ...) get latest git version. But not even worth :(
>> This is the command:
>>
>> $ ffmpeg -v verbose -i /dev/video0 -f video4linux2 -s 640x480 -r 25
>> out10.avi 2>&1 | tee -a ffmpeg-grab.log
>>
>> and this is the console output:
>> ffmpeg version N-38750-g599888a Copyright (c) 2000-2012 the FFmpeg
>> developers built on Mar 12 2012 23:50:31 with gcc 4.4.5
>>   configuration: --enable-nonfree --enable-libv4l2
>>   libavutil      51. 42.100 / 51. 42.100
>>   libavcodec     54. 10.100 / 54. 10.100
>>   libavformat    54.  2.100 / 54.  2.100
>>   libavdevice    53.  4.100 / 53.  4.100
>>   libavfilter     2. 64.101 /  2. 64.101
>>   libswscale      2.  1.100 /  2.  1.100
>>   libswresample   0.  7.100 /  0.  7.100
>> /dev/video0: Invalid data found when processing input
>>
>> What could be missed?
>> Sincerely
>
> Ok, I missed something. Try -f video4linux2 -i /dev/video0...
>
> --
> ===================================================
> Rodney Baker VK5ZTV
> rodney.baker at iinet.net.au
> ===================================================
>
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