[FFmpeg-user] FFmpeg getting stuck and prints Finishing stream 0:0 without any data written to it.

Abhisek Techie abhisek.study2016 at gmail.com
Tue Oct 23 19:41:36 EEST 2018 

Hi,
I have double display and with /dev/video0 I don't encounter any issue.


On Sat, 20 Oct 2018, 15:08 DopeLabs <dopelabs at dubstep.fm wrote:

> do you have single or dual displays? your command is selecting /dev/video1
> which would be a 2nd display.. sources generally start at 0..
>
> can you get a good capture using /dev/video0 ?
>
>
>
> > On Oct 19, 2018, at 9:31 57PM, Abhisek Techie <
> abhisek.study2016 at gmail.com> wrote:
> >
> > Hi,
> > Any suggestions,on the below issue.
> >
> > Regards
> >
> > On Thu, 18 Oct 2018, 15:29 Abhisek Techie, <abhisek.study2016 at gmail.com>
> > wrote:
> >
> >> Hi,
> >>
> >> I am using a logitech 310c camera in linux environment to capture video
> >> and convert it to a .flv file , by using the below command
> >>
> >> ffmpeg -f video4linux2 -s 432*240 -r 5 -pixel_format yuyv422 -i
> >> /dev/video1 out3.flv -loglevel debug
> >>
> >> But , it gets stuck after printing "*[video4linux2,v4l2 @ 0x5864e400]
> >> Setting time per frame to 1/5"* and when I interrupt  with ctrl+c  it
> >> prints "*Output file is empty, nothing was encoded". *
> >>
> >> Below is the debug log , any suggestions on what's wrong with my
> approach?
> >>
> >> ffmpeg version N-91993-g50d9c85358 Copyright (c) 2000-2018 the FFmpeg
> >> developers
> >>  built with gcc 6.3.0 (Debian 6.3.0-18+deb9u1) 20170516
> >>  configuration: --disable-x86asm
> >>  libavutil      56. 19.101 / 56. 19.101
> >>  libavcodec     58. 30.100 / 58. 30.100
> >>  libavformat    58. 18.101 / 58. 18.101
> >>  libavdevice    58.  4.103 / 58.  4.103
> >>  libavfilter     7. 32.100 /  7. 32.100
> >>  libswscale      5.  2.100 /  5.  2.100
> >>  libswresample   3.  2.100 /  3.  2.100
> >> Splitting the commandline.
> >> Reading option '-f' ... matched as option 'f' (force format) with
> argument
> >> 'video4linux2'.
> >> Reading option '-s' ... matched as option 's' (set frame size (WxH or
> >> abbreviation)) with argument '432*240'.
> >> Reading option '-r' ... matched as option 'r' (set frame rate (Hz value,
> >> fraction or abbreviation)) with argument '5'.
> >> Reading option '-pixel_format' ... matched as AVOption 'pixel_format'
> with
> >> argument 'yuyv422'.
> >> Reading option '-i' ... matched as input url with argument
> '/dev/video1'.
> >> Reading option 'out3.flv' ... matched as output url.
> >> Reading option '-loglevel' ... matched as option 'loglevel' (set logging
> >> level) with argument 'debug'.
> >> Finished splitting the commandline.
> >> Parsing a group of options: global .
> >> Applying option loglevel (set logging level) with argument debug.
> >> Successfully parsed a group of options.
> >> Parsing a group of options: input url /dev/video1.
> >> Applying option f (force format) with argument video4linux2.
> >> Applying option s (set frame size (WxH or abbreviation)) with argument
> >> 432*240.
> >> Applying option r (set frame rate (Hz value, fraction or abbreviation))
> >> with argument 5.
> >> Successfully parsed a group of options.
> >> Opening an input file: /dev/video1.
> >> [video4linux2,v4l2 @ 0x5864e400] fd:3 capabilities:84200001
> >> [video4linux2,v4l2 @ 0x5864e400] Current input_channel: 0, input_name:
> >> Camera 1, input_std: 0
> >> [video4linux2,v4l2 @ 0x5864e400] Setting time per frame to 1/5  * [Place
> >> where it is getting stuck ]*
> >> [video4linux2,v4l2 @ 0x5864e400] interrupted
> >> Input #0, video4linux2,v4l2, from '/dev/video1':
> >>  Duration: N/A, bitrate: 8294 kb/s
> >>    Stream #0:0, 0, 1/1000000: Video: rawvideo, 1 reference frame (YUY2 /
> >> 0x32595559), yuyv422, 432x240 (0x0), 0/1, 8294 kb/s, 5 fps, 5 tbr, 1000k
> >> tbn, 1000k tbc
> >> Successfully opened the file.
> >> Parsing a group of options: output url out3.flv.
> >> Successfully parsed a group of options.
> >> Opening an output file: out3.flv.
> >> [file @ 0x58653a00] Setting default whitelist 'file,crypto'
> >> Successfully opened the file.
> >> Stream mapping:
> >>  Stream #0:0 -> #0:0 (rawvideo (native) -> flv1 (flv))
> >> Press [q] to stop, [?] for help
> >> Finishing stream 0:0 without any data written to it.
> >> detected 1 logical cores
> >> [graph 0 input from stream 0:0 @ 0x58654dc0] Setting 'video_size' to
> value
> >> '432x240'
> >> [graph 0 input from stream 0:0 @ 0x58654dc0] Setting 'pix_fmt' to value
> '1'
> >> [graph 0 input from stream 0:0 @ 0x58654dc0] Setting 'time_base' to
> value
> >> '1/5'
> >> [graph 0 input from stream 0:0 @ 0x58654dc0] Setting 'pixel_aspect' to
> >> value '0/1'
> >> [graph 0 input from stream 0:0 @ 0x58654dc0] Setting 'sws_param' to
> value
> >> 'flags=2'
> >> [graph 0 input from stream 0:0 @ 0x58654dc0] Setting 'frame_rate' to
> value
> >> '5/1'
> >> [graph 0 input from stream 0:0 @ 0x58654dc0] w:432 h:240 pixfmt:yuyv422
> >> tb:1/5 fr:5/1 sar:0/1 sws_param:flags=2
> >> [format @ 0x58655380] Setting 'pix_fmts' to value 'yuv420p'
> >> [auto_scaler_0 @ 0x58655cc0] Setting 'flags' to value 'bicubic'
> >> [auto_scaler_0 @ 0x58655cc0] w:iw h:ih flags:'bicubic' interl:0
> >> [format @ 0x58655380] auto-inserting filter 'auto_scaler_0' between the
> >> filter 'Parsed_null_0' and the filter 'format'
> >> [AVFilterGraph @ 0x58654a00] query_formats: 4 queried, 2 merged, 1
> already
> >> done, 0 delayed
> >> [auto_scaler_0 @ 0x58655cc0] w:432 h:240 fmt:yuyv422 sar:0/1 -> w:432
> >> h:240 fmt:yuv420p sar:0/1 flags:0x4
> >> [flv @ 0x58651480] intra_quant_bias = 0 inter_quant_bias = -64
> >> Output #0, flv, to 'out3.flv':
> >>  Metadata:
> >>    encoder         : Lavf58.18.101
> >>    Stream #0:0, 0, 1/1000: Video: flv1 (flv), 1 reference frame
> >> ([2][0][0][0] / 0x0002), yuv420p, 432x240, 0/1, q=2-31, 200 kb/s, 5
> fps, 1k
> >> tbn, 5 tbc
> >> Metadata:
> >>      encoder         : Lavc58.30.100 flv
> >>    Side data:
> >>      cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
> >> 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
> >> Input file #0 (/dev/video1):
> >>  Input stream #0:0 (video): 0 packets read (0 bytes); 0 frames decoded;
> >>  Total: 0 packets (0 bytes) demuxed
> >> Output file #0 (out3.flv):
> >>  Output stream #0:0 (video): 0 frames encoded; 0 packets muxed (0
> bytes);
> >>  Total: 0 packets (0 bytes) muxed
> >> Output file is empty, nothing was encoded (check -ss / -t / -frames
> >> parameters if used)
> >> 0 frames successfully decoded, 0 decoding errors
> >> [AVIOContext @ 0x58653a80] Statistics: 1 seeks, 1 writeouts
> >> Exiting normally, received signal 2.
> >>
> >> Regards
> >>
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