Hello,

I use ffmpeg with -vframes 1 for testing if a MJPEG is working (1),



to do it, i run:
ffmpeg -loglevel debug -an -f mjpeg  -i 'ADDRESS' -vf scale="'if(gt(a,4/3),320,-1)':'if(gt(a,4/3),-1,240)'" -vframes 1  /tmp/uhum.jpg
Then it takes 2 minutes (at first I think that it was stoped, but it responded after a long time, so I tested again with timeout option and it take much lower time.)

renato@ood:/projetos/aware/etamu/lost-n-found$ time /home/renato/ffmpeg/ffmpeg-HEAD-e2742d6/ffmpeg -loglevel debug -an  -f mjpeg -timeout 10 -i 'http://admin:lala@postogasolina.dyndns.org:8081/videostream.cgi?rate=6&password=lala&pwd=lala&resolution=8&user=admin&usr=admin' -vf scale="'if(gt(a,4/3),320,-1)':'if(gt(a,4/3),-1,240)'" -vframes 1  /tmp/uhum.jpg
ffmpeg version 2.1.git-e2742d6 Copyright (c) 2000-2013 the FFmpeg developers
  built on Dec 16 2013 13:41:29 with gcc 4.7 (Ubuntu/Linaro 4.7.2-2ubuntu1)
  configuration: --enable-gpl --enable-libx264 --prefix='~/ffmpeg/'
  libavutil      52. 58.100 / 52. 58.100
  libavcodec     55. 45.101 / 55. 45.101
  libavformat    55. 22.100 / 55. 22.100
  libavdevice    55.  5.102 / 55.  5.102
  libavfilter     3. 92.100 /  3. 92.100
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
Splitting the commandline.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
Reading option '-an' ... matched as option 'an' (disable audio) with argument '1'.
Reading option '-f' ... matched as option 'f' (force format) with argument 'mjpeg'.
Reading option '-timeout' ... matched as AVOption 'timeout' with argument '10'.
Reading option '-i' ... matched as input file with argument 'http://admin:lala@postogasolina.dyndns.org:8081/videostream.cgi?rate=6&password=lala&pwd=lala&resolution=8&user=admin&usr=admin'.
Reading option '-vf' ... matched as option 'vf' (set video filters) with argument 'scale='if(gt(a,4/3),320,-1)':'if(gt(a,4/3),-1,240)''.
Reading option '-vframes' ... matched as option 'vframes' (set the number of video frames to record) with argument '1'.
Reading option '/tmp/uhum.jpg' ... matched as output file.
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 file http://admin:lala@postogasolina.dyndns.org:8081/videostream.cgi?rate=6&password=lala&pwd=lala&resolution=8&user=admin&usr=admin.
Applying option an (disable audio) with argument 1.
Applying option f (force format) with argument mjpeg.
Successfully parsed a group of options.
Opening an input file: http://admin:lala@postogasolina.dyndns.org:8081/videostream.cgi?rate=6&password=lala&pwd=lala&resolution=8&user=admin&usr=admin.
[http @ 0x9f2e3a0] request: GET /videostream.cgi?rate=6&password=lala&pwd=lala&resolution=8&user=admin&usr=admin HTTP/1.1
User-Agent: Lavf/55.22.100
Accept: */*
Range: bytes=0-
Connection: close
Host: postogasolina.dyndns.org:8081


[http @ 0x9f2e3a0] header='HTTP/1.1 200 OK'
[http @ 0x9f2e3a0] http_code=200
[http @ 0x9f2e3a0] header='Server: Netwave IP Camera'
[http @ 0x9f2e3a0] header='Date: Wed, 26 Mar 2014 05:45:29 GMT'
[http @ 0x9f2e3a0] header='Accept-Ranges: bytes'
[http @ 0x9f2e3a0] header='Connection: close'
[http @ 0x9f2e3a0] header='Content-Type: multipart/x-mixed-replace;boundary=ipcamera'
[http @ 0x9f2e3a0] header=''
[mjpeg @ 0x9f2dde0] Before avformat_find_stream_info() pos: 0 bytes read:1400 seeks:0
[mjpeg @ 0x9f39080] marker=d8 avail_size_in_buf=15151
[mjpeg @ 0x9f39080] marker parser used 0 bytes (0 bits)
[mjpeg @ 0x9f39080] marker=db avail_size_in_buf=15149
[mjpeg @ 0x9f39080] index=0
[mjpeg @ 0x9f39080] qscale[0]: 4
[mjpeg @ 0x9f39080] index=1
[mjpeg @ 0x9f39080] qscale[1]: 8
[mjpeg @ 0x9f39080] marker parser used 132 bytes (1056 bits)
[mjpeg @ 0x9f39080] marker=c4 avail_size_in_buf=15015
[mjpeg @ 0x9f39080] class=0 index=0 nb_codes=12
[mjpeg @ 0x9f39080] class=0 index=1 nb_codes=12
[mjpeg @ 0x9f39080] class=1 index=0 nb_codes=251
[mjpeg @ 0x9f39080] class=1 index=1 nb_codes=251
[mjpeg @ 0x9f39080] marker parser used 418 bytes (3344 bits)
[mjpeg @ 0x9f39080] marker=c0 avail_size_in_buf=14595
[mjpeg @ 0x9f39080] sof0: picture: 640x480
[mjpeg @ 0x9f39080] component 0 2:1 id: 0 quant:0
[mjpeg @ 0x9f39080] component 1 1:1 id: 1 quant:1
[mjpeg @ 0x9f39080] component 2 1:1 id: 2 quant:1
[mjpeg @ 0x9f39080] pix fmt id 21111100
[mjpeg @ 0x9f39080] marker parser used 17 bytes (136 bits)
[mjpeg @ 0x9f39080] escaping removed 67 bytes
[mjpeg @ 0x9f39080] marker=da avail_size_in_buf=14576
[mjpeg @ 0x9f39080] component: 0
[mjpeg @ 0x9f39080] component: 1
[mjpeg @ 0x9f39080] component: 2
[mjpeg @ 0x9f39080] marker parser used 14508 bytes (116061 bits)
[mjpeg @ 0x9f39080] marker=d9 avail_size_in_buf=66
[mjpeg @ 0x9f39080] decode frame unused 66 bytes
[mjpeg @ 0x9f2dde0] After avformat_find_stream_info() pos: 25200 bytes read:25200 seeks:0 frames:2
Input #0, mjpeg, from 'http://admin:lala@postogasolina.dyndns.org:8081/videostream.cgi?rate=6&password=lala&pwd=lala&resolution=8&user=admin&usr=admin':
  Duration: N/A, bitrate: N/A
    Stream #0:0, 2, 1/1200000: Video: mjpeg, yuvj422p(pc), 640x480, 1/25, 25 tbr, 1200k tbn, 25 tbc
Successfully opened the file.
Parsing a group of options: output file /tmp/uhum.jpg.
Applying option vf (set video filters) with argument scale='if(gt(a,4/3),320,-1)':'if(gt(a,4/3),-1,240)'.
Applying option vframes (set the number of video frames to record) with argument 1.
Successfully parsed a group of options.
Opening an output file: /tmp/uhum.jpg.
Successfully opened the file.
detected 8 logical cores
[Parsed_scale_0 @ 0x9f4c480] Setting 'w' to value 'if(gt(a,4/3),320,-1)'
[Parsed_scale_0 @ 0x9f4c480] Setting 'h' to value 'if(gt(a,4/3),-1,240)'
[Parsed_scale_0 @ 0x9f4c480] Setting 'flags' to value '0x4'
[Parsed_scale_0 @ 0x9f4c480] w:if(gt(a,4/3),320,-1) h:if(gt(a,4/3),-1,240) flags:'0x4' interl:0
[graph 0 input from stream 0:0 @ 0x9f27e40] Setting 'video_size' to value '640x480'
[graph 0 input from stream 0:0 @ 0x9f27e40] Setting 'pix_fmt' to value '13'
[graph 0 input from stream 0:0 @ 0x9f27e40] Setting 'time_base' to value '1/1200000'
[graph 0 input from stream 0:0 @ 0x9f27e40] Setting 'pixel_aspect' to value '0/1'
[graph 0 input from stream 0:0 @ 0x9f27e40] Setting 'sws_param' to value 'flags=2'
[graph 0 input from stream 0:0 @ 0x9f27e40] Setting 'frame_rate' to value '25/1'
[graph 0 input from stream 0:0 @ 0x9f27e40] w:640 h:480 pixfmt:yuvj422p tb:1/1200000 fr:25/1 sar:0/1 sws_param:flags=2
[format @ 0x9f4ca80] compat: called with args=[yuvj420p|yuvj422p|yuvj444p]
[format @ 0x9f4ca80] Setting 'pix_fmts' to value 'yuvj420p|yuvj422p|yuvj444p'
[AVFilterGraph @ 0x9f27e00] query_formats: 4 queried, 3 merged, 0 already done, 0 delayed
[swscaler @ 0x9f21fe0] deprecated pixel format used, make sure you did set range correctly
[Parsed_scale_0 @ 0x9f4c480] w:640 h:480 fmt:yuvj422p sar:0/1 -> w:320 h:240 fmt:yuvj422p sar:0/1 flags:0x4
[mjpeg @ 0x9f44380] intra_quant_bias = 96 inter_quant_bias = 0
[mjpeg @ 0x9f2c3a0] intra_quant_bias = 96 inter_quant_bias = 0
[mjpeg @ 0x9f83520] intra_quant_bias = 96 inter_quant_bias = 0
[mjpeg @ 0x9fa1ea0] intra_quant_bias = 96 inter_quant_bias = 0
[mjpeg @ 0x9fc0a40] intra_quant_bias = 96 inter_quant_bias = 0
[mjpeg @ 0x9fdf5c0] intra_quant_bias = 96 inter_quant_bias = 0
[mjpeg @ 0x9ffe140] intra_quant_bias = 96 inter_quant_bias = 0
[mjpeg @ 0xa01ccc0] intra_quant_bias = 96 inter_quant_bias = 0
[mjpeg @ 0x9f3a260] intra_quant_bias = 96 inter_quant_bias = 0
Output #0, image2, to '/tmp/uhum.jpg':
  Metadata:
    encoder         : Lavf55.22.100
    Stream #0:0, 0, 1/90000: Video: mjpeg, yuvj422p, 320x240, 1/25, q=2-31, 200 kb/s, 90k tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg -> mjpeg)
Press [q] to stop, [?] for help
[mjpeg @ 0x9f39080] marker=d8 avail_size_in_buf=15151
[mjpeg @ 0x9f39080] marker parser used 0 bytes (0 bits)
[mjpeg @ 0x9f39080] marker=db avail_size_in_buf=15149
[mjpeg @ 0x9f39080] index=0
[mjpeg @ 0x9f39080] qscale[0]: 4
[mjpeg @ 0x9f39080] index=1
[mjpeg @ 0x9f39080] qscale[1]: 8
[mjpeg @ 0x9f39080] marker parser used 132 bytes (1056 bits)
[mjpeg @ 0x9f39080] marker=c4 avail_size_in_buf=15015
[mjpeg @ 0x9f39080] class=0 index=0 nb_codes=12
[mjpeg @ 0x9f39080] class=0 index=1 nb_codes=12
[mjpeg @ 0x9f39080] class=1 index=0 nb_codes=251
[mjpeg @ 0x9f39080] class=1 index=1 nb_codes=251
[mjpeg @ 0x9f39080] marker parser used 418 bytes (3344 bits)
[mjpeg @ 0x9f39080] marker=c0 avail_size_in_buf=14595
[mjpeg @ 0x9f39080] sof0: picture: 640x480
[mjpeg @ 0x9f39080] component 0 2:1 id: 0 quant:0
[mjpeg @ 0x9f39080] component 1 1:1 id: 1 quant:1
[mjpeg @ 0x9f39080] component 2 1:1 id: 2 quant:1
[mjpeg @ 0x9f39080] pix fmt id 21111100
[mjpeg @ 0x9f39080] marker parser used 17 bytes (136 bits)
[mjpeg @ 0x9f39080] escaping removed 67 bytes
[mjpeg @ 0x9f39080] marker=da avail_size_in_buf=14576
[mjpeg @ 0x9f39080] component: 0
[mjpeg @ 0x9f39080] component: 1
[mjpeg @ 0x9f39080] component: 2
[mjpeg @ 0x9f39080] marker parser used 14508 bytes (116061 bits)
[mjpeg @ 0x9f39080] marker=d9 avail_size_in_buf=66
[mjpeg @ 0x9f39080] decode frame unused 66 bytes
No more output streams to write to, finishing.
[AVIOContext @ 0xa059e20] Statistics: 0 seeks, 1 writeouts
frame=    1 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A
video:7kB audio:0kB subtitle:0 global headers:0kB muxing overhead -100.294393%
1 frames successfully decoded, 0 decoding errors
[AVIOContext @ 0x9f38cc0] Statistics: 25200 bytes read, 0 seeks

real    0m2.303s
user    0m0.008s
sys 0m0.028s
renato@ood:/projetos/aware/etamu/lost-n-found$
renato@ood:/projetos/aware/etamu/lost-n-found$
renato@ood:/projetos/aware/etamu/lost-n-found$
renato@ood:/projetos/aware/etamu/lost-n-found$
renato@ood:/projetos/aware/etamu/lost-n-found$
renato@ood:/projetos/aware/etamu/lost-n-found$
renato@ood:/projetos/aware/etamu/lost-n-found$ time /home/renato/ffmpeg/ffmpeg-HEAD-e2742d6/ffmpeg -loglevel debug -an  -f mjpeg  -i 'http://admin:lala@postogasolina.dyndns.org:8081/videostream.cgi?rate=6&password=lala&pwd=lala&resolution=8&user=admin&usr=admin' -vf scale="'if(gt(a,4/3),320,-1)':'if(gt(a,4/3),-1,240)'" -vframes 1  /tmp/uhum2.jpgffmpeg version 2.1.git-e2742d6 Copyright (c) 2000-2013 the FFmpeg developers
  built on Dec 16 2013 13:41:29 with gcc 4.7 (Ubuntu/Linaro 4.7.2-2ubuntu1)
  configuration: --enable-gpl --enable-libx264 --prefix='~/ffmpeg/'
  libavutil      52. 58.100 / 52. 58.100
  libavcodec     55. 45.101 / 55. 45.101
  libavformat    55. 22.100 / 55. 22.100
  libavdevice    55.  5.102 / 55.  5.102
  libavfilter     3. 92.100 /  3. 92.100
  libswscale      2.  5.101 /  2.  5.101
  libswresample   0. 17.104 /  0. 17.104
  libpostproc    52.  3.100 / 52.  3.100
Splitting the commandline.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging level) with argument 'debug'.
Reading option '-an' ... matched as option 'an' (disable audio) with argument '1'.
Reading option '-f' ... matched as option 'f' (force format) with argument 'mjpeg'.
Reading option '-i' ... matched as input file with argument 'http://admin:lala@postogasolina.dyndns.org:8081/videostream.cgi?rate=6&password=lala&pwd=lala&resolution=8&user=admin&usr=admin'.
Reading option '-vf' ... matched as option 'vf' (set video filters) with argument 'scale='if(gt(a,4/3),320,-1)':'if(gt(a,4/3),-1,240)''.
Reading option '-vframes' ... matched as option 'vframes' (set the number of video frames to record) with argument '1'.
Reading option '/tmp/uhum2.jpg' ... matched as output file.
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 file http://admin:lala@postogasolina.dyndns.org:8081/videostream.cgi?rate=6&password=lala&pwd=lala&resolution=8&user=admin&usr=admin.
Applying option an (disable audio) with argument 1.
Applying option f (force format) with argument mjpeg.
Successfully parsed a group of options.
Opening an input file: http://admin:lala@postogasolina.dyndns.org:8081/videostream.cgi?rate=6&password=lala&pwd=lala&resolution=8&user=admin&usr=admin.
[http @ 0x9e4a2c0] request: GET /videostream.cgi?rate=6&password=lala&pwd=lala&resolution=8&user=admin&usr=admin HTTP/1.1
User-Agent: Lavf/55.22.100
Accept: */*
Range: bytes=0-
Connection: close
Host: postogasolina.dyndns.org:8081


[http @ 0x9e4a2c0] header='HTTP/1.1 200 OK'
[http @ 0x9e4a2c0] http_code=200
[http @ 0x9e4a2c0] header='Server: Netwave IP Camera'
[http @ 0x9e4a2c0] header='Date: Wed, 26 Mar 2014 05:45:39 GMT'
[http @ 0x9e4a2c0] header='Accept-Ranges: bytes'
[http @ 0x9e4a2c0] header='Connection: close'
[http @ 0x9e4a2c0] header='Content-Type: multipart/x-mixed-replace;boundary=ipcamera'
[http @ 0x9e4a2c0] header=''
[mjpeg @ 0x9e49d80] Before avformat_find_stream_info() pos: 0 bytes read:1400 seeks:0
[mjpeg @ 0x9e54fa0] marker=d8 avail_size_in_buf=15121
[mjpeg @ 0x9e54fa0] marker parser used 0 bytes (0 bits)
[mjpeg @ 0x9e54fa0] marker=db avail_size_in_buf=15119
[mjpeg @ 0x9e54fa0] index=0
[mjpeg @ 0x9e54fa0] qscale[0]: 4
[mjpeg @ 0x9e54fa0] index=1
[mjpeg @ 0x9e54fa0] qscale[1]: 8
[mjpeg @ 0x9e54fa0] marker parser used 132 bytes (1056 bits)
[mjpeg @ 0x9e54fa0] marker=c4 avail_size_in_buf=14985
[mjpeg @ 0x9e54fa0] class=0 index=0 nb_codes=12
[mjpeg @ 0x9e54fa0] class=0 index=1 nb_codes=12
[mjpeg @ 0x9e54fa0] class=1 index=0 nb_codes=251
[mjpeg @ 0x9e54fa0] class=1 index=1 nb_codes=251
[mjpeg @ 0x9e54fa0] marker parser used 418 bytes (3344 bits)
[mjpeg @ 0x9e54fa0] marker=c0 avail_size_in_buf=14565
[mjpeg @ 0x9e54fa0] sof0: picture: 640x480
[mjpeg @ 0x9e54fa0] component 0 2:1 id: 0 quant:0
[mjpeg @ 0x9e54fa0] component 1 1:1 id: 1 quant:1
[mjpeg @ 0x9e54fa0] component 2 1:1 id: 2 quant:1
[mjpeg @ 0x9e54fa0] pix fmt id 21111100
[mjpeg @ 0x9e54fa0] marker parser used 17 bytes (136 bits)
[mjpeg @ 0x9e54fa0] escaping removed 70 bytes
[mjpeg @ 0x9e54fa0] marker=da avail_size_in_buf=14546
[mjpeg @ 0x9e54fa0] component: 0
[mjpeg @ 0x9e54fa0] component: 1
[mjpeg @ 0x9e54fa0] component: 2
[mjpeg @ 0x9e54fa0] marker parser used 14475 bytes (115794 bits)
[mjpeg @ 0x9e54fa0] marker=d9 avail_size_in_buf=66
[mjpeg @ 0x9e54fa0] decode frame unused 66 bytes
[mjpeg @ 0x9e49d80] max_analyze_duration 5000000 reached at 5000000 microseconds
[mjpeg @ 0x9e49d80] After avformat_find_stream_info() pos: 1938758 bytes read:1939134 seeks:0 frames:127
Input #0, mjpeg, from 'http://admin:lala@postogasolina.dyndns.org:8081/videostream.cgi?rate=6&password=lala&pwd=lala&resolution=8&user=admin&usr=admin':
  Duration: N/A, bitrate: N/A
    Stream #0:0, 127, 1/1200000: Video: mjpeg, yuvj422p(pc), 640x480, 1/25, 25 fps, 25 tbr, 1200k tbn, 25 tbc
Successfully opened the file.
Parsing a group of options: output file /tmp/uhum2.jpg.
Applying option vf (set video filters) with argument scale='if(gt(a,4/3),320,-1)':'if(gt(a,4/3),-1,240)'.
Applying option vframes (set the number of video frames to record) with argument 1.
Successfully parsed a group of options.
Opening an output file: /tmp/uhum2.jpg.
Successfully opened the file.
detected 8 logical cores
[Parsed_scale_0 @ 0x9e5d1a0] Setting 'w' to value 'if(gt(a,4/3),320,-1)'
[Parsed_scale_0 @ 0x9e5d1a0] Setting 'h' to value 'if(gt(a,4/3),-1,240)'
[Parsed_scale_0 @ 0x9e5d1a0] Setting 'flags' to value '0x4'
[Parsed_scale_0 @ 0x9e5d1a0] w:if(gt(a,4/3),320,-1) h:if(gt(a,4/3),-1,240) flags:'0x4' interl:0
[graph 0 input from stream 0:0 @ 0x9e55580] Setting 'video_size' to value '640x480'
[graph 0 input from stream 0:0 @ 0x9e55580] Setting 'pix_fmt' to value '13'
[graph 0 input from stream 0:0 @ 0x9e55580] Setting 'time_base' to value '1/1200000'
[graph 0 input from stream 0:0 @ 0x9e55580] Setting 'pixel_aspect' to value '0/1'
[graph 0 input from stream 0:0 @ 0x9e55580] Setting 'sws_param' to value 'flags=2'
[graph 0 input from stream 0:0 @ 0x9e55580] Setting 'frame_rate' to value '25/1'
[graph 0 input from stream 0:0 @ 0x9e55580] w:640 h:480 pixfmt:yuvj422p tb:1/1200000 fr:25/1 sar:0/1 sws_param:flags=2
[format @ 0x9e68340] compat: called with args=[yuvj420p|yuvj422p|yuvj444p]
[format @ 0x9e68340] Setting 'pix_fmts' to value 'yuvj420p|yuvj422p|yuvj444p'
[AVFilterGraph @ 0x9e55640] query_formats: 4 queried, 3 merged, 0 already done, 0 delayed
[swscaler @ 0xa04a960] deprecated pixel format used, make sure you did set range correctly
[Parsed_scale_0 @ 0x9e5d1a0] w:640 h:480 fmt:yuvj422p sar:0/1 -> w:320 h:240 fmt:yuvj422p sar:0/1 flags:0x4
[mjpeg @ 0x9e43ea0] intra_quant_bias = 96 inter_quant_bias = 0
[mjpeg @ 0x9e3c260] intra_quant_bias = 96 inter_quant_bias = 0
[mjpeg @ 0xa07d920] intra_quant_bias = 96 inter_quant_bias = 0
[mjpeg @ 0xa09c3e0] intra_quant_bias = 96 inter_quant_bias = 0
[mjpeg @ 0xa0baf60] intra_quant_bias = 96 inter_quant_bias = 0
[mjpeg @ 0xa0d9ae0] intra_quant_bias = 96 inter_quant_bias = 0
[mjpeg @ 0xa0f8660] intra_quant_bias = 96 inter_quant_bias = 0
[mjpeg @ 0xa1171e0] intra_quant_bias = 96 inter_quant_bias = 0
[mjpeg @ 0x9e5baa0] intra_quant_bias = 96 inter_quant_bias = 0
Output #0, image2, to '/tmp/uhum2.jpg':
  Metadata:
    encoder         : Lavf55.22.100
    Stream #0:0, 0, 1/90000: Video: mjpeg, yuvj422p, 320x240, 1/25, q=2-31, 200 kb/s, 90k tbn, 25 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (mjpeg -> mjpeg)
Press [q] to stop, [?] for help
[mjpeg @ 0x9e54fa0] marker=d8 avail_size_in_buf=15121
[mjpeg @ 0x9e54fa0] marker parser used 0 bytes (0 bits)
[mjpeg @ 0x9e54fa0] marker=db avail_size_in_buf=15119
[mjpeg @ 0x9e54fa0] index=0
[mjpeg @ 0x9e54fa0] qscale[0]: 4
[mjpeg @ 0x9e54fa0] index=1
[mjpeg @ 0x9e54fa0] qscale[1]: 8
[mjpeg @ 0x9e54fa0] marker parser used 132 bytes (1056 bits)
[mjpeg @ 0x9e54fa0] marker=c4 avail_size_in_buf=14985
[mjpeg @ 0x9e54fa0] class=0 index=0 nb_codes=12
[mjpeg @ 0x9e54fa0] class=0 index=1 nb_codes=12
[mjpeg @ 0x9e54fa0] class=1 index=0 nb_codes=251
[mjpeg @ 0x9e54fa0] class=1 index=1 nb_codes=251
[mjpeg @ 0x9e54fa0] marker parser used 418 bytes (3344 bits)
[mjpeg @ 0x9e54fa0] marker=c0 avail_size_in_buf=14565
[mjpeg @ 0x9e54fa0] sof0: picture: 640x480
[mjpeg @ 0x9e54fa0] component 0 2:1 id: 0 quant:0
[mjpeg @ 0x9e54fa0] component 1 1:1 id: 1 quant:1
[mjpeg @ 0x9e54fa0] component 2 1:1 id: 2 quant:1
[mjpeg @ 0x9e54fa0] pix fmt id 21111100
[mjpeg @ 0x9e54fa0] marker parser used 17 bytes (136 bits)
[mjpeg @ 0x9e54fa0] escaping removed 70 bytes
[mjpeg @ 0x9e54fa0] marker=da avail_size_in_buf=14546
[mjpeg @ 0x9e54fa0] component: 0
[mjpeg @ 0x9e54fa0] component: 1
[mjpeg @ 0x9e54fa0] component: 2
[mjpeg @ 0x9e54fa0] marker parser used 14475 bytes (115794 bits)
[mjpeg @ 0x9e54fa0] marker=d9 avail_size_in_buf=66
[mjpeg @ 0x9e54fa0] decode frame unused 66 bytes
No more output streams to write to, finishing.
[AVIOContext @ 0xa154340] Statistics: 0 seeks, 1 writeouts
frame=    1 fps=0.0 q=0.0 Lsize=N/A time=00:00:00.04 bitrate=N/A
video:7kB audio:0kB subtitle:0 global headers:0kB muxing overhead -100.294039%
1 frames successfully decoded, 0 decoding errors
[AVIOContext @ 0x9e54c60] Statistics: 1939134 bytes read, 0 seeks

real    2m32.823s
user    0m0.096s
sys 0m0.080s

Comparing both with meld, I see few bytes changes, but without timeout, how finish the connection is:
[mjpeg @ 0x9e49d80] max_analyze_duration 5000000 reached at 5000000 microseconds

left=without timeout, image of meld @ http://i.imgur.com/clgHarL.png


i'm setting timeout from now, first because it's a good ideia do that!
but is interesting known why this delay happen when it is not set.





1: I only call if for working URLs that at least responded with a JPEG some seconds before, but that's not the case.