[libav-tools] avconv -ss problem

John A. Sullivan III Thu, 14 Feb 2013 14:27:28 -0800

Hello, all.  I am having a problem with avconv when using -ss for the
input file.  It works fine as an output file parameter and it works as
an input file parameter but only with tiny values, e.g., 3 seconds.


For example:
avconv -vsync 1 -re -ss 3 -i 322450057_003.mpg  -f nut -
works
avconv -vsync 1 -re -ss 30 -i 322450057_003.mpg  -f nut -
doesn't.
It does work in ffmpeg.  It also failed using the hh:mm:ss format.  Am I
doing something stupid?
I do get a brief moment (> 1s) of output and these warnings:
[mpeg @ 0x2ed8700] max_analyze_duration reached
322450057_003.mpg: could not seek to position 73699.162

Here is the actual output with some of the output video snipped:

rita@hdsdi-pc2:~/Desktop$ avconv -vsync 1 -re -ss 30 -i
322450057_003.mpg  -f nut -
avconv version 9.1, Copyright (c) 2000-2013 the Libav developers
  built on Feb  7 2013 17:49:03 with gcc 4.6 (Ubuntu/Linaro
4.6.3-1ubuntu5)
[mpeg @ 0x2ed8700] max_analyze_duration reached
322450057_003.mpg: could not seek to position 73699.162
Guessed Channel Layout for  Input Stream #0.1 : stereo
Input #0, mpeg, from '322450057_003.mpg':
  Duration: 11:09:05.77, start: 73669.162367, bitrate: 910 kb/s
    Stream #0.0[0x1e0]: Video: h264 (High), yuv420p, 960x540 [PAR 1:1
DAR 16:9], 30 fps, 30 tbr, 90k tbn, 60 tbc
    Stream #0.1[0x1c0]: Audio: mp3, 48000 Hz, stereo, s16p, 64 kb/s
[h264 @ 0x3383c80] Ignoring NAL unit 9 during extradata parsing
nut/multimedia containerNMzV_�`���n��()!
 {()!(!!��������������NS@[���EFMP4-��� 
č��C�C�Lavc54.35.0�@�oM��NS@[��۟oV�n�mTvorbis�����vorbis-Xiph.Org
 libVorbis I 20101101 
(Schaufenugget)encoder=Lavc54.35.0vorbis%BCV@$s*F�s�BP�B�k�BL�2L[�%s�!��B�[(�АU@�Ax��!�%=X��'!��9x�i!�!�!�E9h��'��08

��8��E9X�'A� �B����!�$5HP�9���,(���0��5(���0�ԃ

B���I5��gAx�i!�$AH��A��FAX��9���A��*� 4d���(��(
�
�@Q�qɑɱ
Y�H��HH�$Y�%Y�%Y�扪,˲,˲,�2�
HPQ
Y@�if��0BCV��0ĀАU@�J�׶m۶m�9ߜ��Y�J�9�H�y����9��s����1�9眢�Y
<snip>
RͩR� �$��1���T2�B
N�)*u
B�uL)-�B���rK�sA���3���stG� Df�D�BpxP S@b�B.TX
\�]\@�.���!A,���p�ox
      ��\��adhlptx|����|$%@DD4s !"#$�
����v@NI�h���xencoder

Lavf54.20.3:�qBOutput #0, nut, to 'pipe:':
  Metadata:
    encoder         : Lavf54.20.3
    Stream #0.0: Video: mpeg4, yuv420p, 960x540 [PAR 1:1 DAR 16:9],
q=2-31, 200 kb/s, 30 tbn, 30 tbc
    Stream #0.1: Audio: libvorbis, 48000 Hz, stereo, fltp
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> mpeg4)
  Stream #0:1 -> #0:1 (mp3 -> libvorbis)
Press ctrl-c to stop encoding
NK����Ei��܄frame=    0 fps=  0 q=0.0 Lsize=       4kB time=0.01
bitrate=3397.6kbits/s    
video:0kB audio:0kB global headers:4kB muxing overhead 6.334502%


I am not a heavy avconv/ffmpeg user so much of this is black magic to
me.  Any help would be greatly appreciated.  Thanks - John
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[libav-tools] avconv -ss problem

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