[FFmpeg-user] frame grabbing from MP4 file takes too long (says: muxing overhead -inf%)

[zeo]

Hi everybody,
I am trying to grab a frame from a MP4 video, which is recorded on my
Samsung Galaxy S android phone. But it takes too long to grab a frame,
ffmpeg produces the following output. If I use a smaller starting time like
-ss 00:00.04, then it performs faster without saying "muxing overhead
-inf%". Any help is appreciated, thank you very much.
Zeo


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$ ./ffmpeg.exe -i input.mp4  -ss 00:01:34  -vframes 1 -y out.jpg

Seems stream 1 codec frame rate differs from container frame rate: 30000.00
(30000/1) -> 30.00 (30/1)
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'utkunamik.mp4':
  Metadata:
    major_brand     : 3gp4
    minor_version   : 768
    compatible_brands: 3gp43gp6
  Duration: 00:01:21.57, start: 0.000000, bitrate: 11099 kb/s
    Stream #0:0(eng): Audio: aac (mp4a / 0x6134706D), 16000 Hz, mono, s16,
62 kb/s
    Metadata:
      handler_name    : SoundHandler
    Stream #0:1(eng): Video: mpeg4 (Simple Profile) (mp4v / 0x7634706D),
yuv420p, 1280x720 [SAR 1:1 DAR 16:9], 11032 kb/s, 29.70 fps, 30 tbr, 30k
tbn, 30k tbc
    Metadata:
      handler_name    : VideoHandler
Incompatible pixel format 'yuv420p' for codec 'mjpeg', auto-selecting format
'yuvj420p'
[buffer @ 0x10464ae0] w:1280 h:720 pixfmt:yuv420p tb:1/1000000 sar:1/1
sws_param:
[buffersink @ 0x1046e3e0] auto-inserting filter 'auto-inserted scale 0'
between the filter 'src' and the filter 'out'
[scale @ 0x1046e140] w:1280 h:720 fmt:yuv420p -> w:1280 h:720 fmt:yuvj420p
flags:0x4
Output #0, image2, to 'out.jpg':
  Metadata:
    major_brand     : 3gp4
    minor_version   : 768
    compatible_brands: 3gp43gp6
    encoder         : Lavf53.21.0
    Stream #0:0(eng): Video: mjpeg, yuvj420p, 1280x720 [SAR 1:1 DAR 16:9],
q=2-31, 200 kb/s, 90k tbn, 30 tbc
    Metadata:
      handler_name    : VideoHandler
Stream mapping:
  Stream #0:1 -> #0:0 (mpeg4 -> mjpeg)
Press [q] to stop, [?] for help
frame=    0 fps=  0 q=0.0 Lsize=      -0kB time=00:00:00.00 bitrate=  
0.0kbits/s
video:0kB audio:0kB global headers:0kB muxing overhead -inf%
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