[FFmpeg-trac] #2651(undetermined:new): Input RTMP Stream, Output JPEG Stream

FFmpeg trac at avcodec.org
Sat Jun 8 04:37:05 CEST 2013


#2651: Input RTMP Stream, Output JPEG Stream
-------------------------------------+-------------------------------------
             Reporter:  Animaleante  |                    Owner:
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
              Version:  unspecified  |  undetermined
             Keywords:  rtmp h264    |               Resolution:
             Blocking:               |               Blocked By:
Analyzed by developer:  0            |  Reproduced by developer:  0
-------------------------------------+-------------------------------------
Description changed by cehoyos:

Old description:

> I am trying to receive as input a RTMP stream from Flash Media Server,
> encoded with h.264(BASELINE, Level 3.1) and save a sequence of JPEG
> images in realtime.
> If I try this kind of conversion when streaming without h.264 (With
> Sorenson codec), the command works just fine.
>
> Command:
> ffmpeg -y -re -loglevel verbose -i "(RTMP STREAM) app=myapp conn=S:ffmpeg
> playpath=mp4:stream54.f4v live=1" -an -r 15 -f image2
> ./imgs/image%04d.jpg
>
> ffmpeg version N-53811-gc8faa47 Copyright (c) 2000-2013 the FFmpeg
> developers
>   built on Jun  3 2013 13:01:58 with gcc 4.1.2 (GCC) 20080704 (Red Hat
> 4.1.2-54)
>   configuration: --enable-version3 --enable-libopencore-amrnb --enable-
> libopencore-amrwb --enable-libfaac --enable-libmp3lame --enable-libtheora
> --enable-libvorbis --enable-libx264 --enable-libxvid --enable-librtmp
> --enable-gpl --enable-postproc --enable-nonfree
>   libavutil      52. 34.100 / 52. 34.100
>   libavcodec     55. 15.100 / 55. 15.100
>   libavformat    55.  8.102 / 55.  8.102
>   libavdevice    55.  2.100 / 55.  2.100
>   libavfilter     3. 74.101 /  3. 74.101
>   libswscale      2.  3.100 /  2.  3.100
>   libswresample   0. 17.102 /  0. 17.102
>   libpostproc    52.  3.100 / 52.  3.100
>
> This is the log I am getting:
> Parsing...
> Parsed protocol: 0
> Parsed host    : localhost
> Parsed app     :
> RTMP_Connect1, ... connected, handshaking
> HandShake: Type Answer   : 03
> HandShake: Server Uptime : 18848860
> HandShake: FMS Version   : 4.5.1.1
> HandShake: Handshaking finished....
> RTMP_Connect1, handshaked
> Invoking connect
> HandleServerBW: server BW = 2500000
> HandleClientBW: client BW = 2500000 2
> HandleChangeChunkSize, received: chunk size change to 4096
> RTMP_ClientPacket, received: invoke 242 bytes
> (object begin)
> Property: <Name:           no-name., STRING:    _result>
> Property: <Name:           no-name., NUMBER:    1.00>
> Property: <Name:           no-name., OBJECT>
> (object begin)
> Property: <Name:             fmsVer, STRING:    FMS/4,5,1,8003>
> Property: <Name:       capabilities, NUMBER:    255.00>
> Property: <Name:               mode, NUMBER:    1.00>
> (object end)
> Property: <Name:           no-name., OBJECT>
> (object begin)
> Property: <Name:              level, STRING:    status>
> Property: <Name:               code, STRING:
> NetConnection.Connect.Success>
> Property: <Name:        description, STRING:    Connection succeeded.>
> Property: <Name:     objectEncoding, NUMBER:    0.00>
> Property: <Name:               data, OBJECT>
> (object begin)
> Property: <Name:            version, STRING:    4,5,1,8003>
> (object end)
> (object end)
> (object end)
> HandleInvoke, server invoking <_result>
> HandleInvoke, received result for method call <connect>
> sending ctrl. type: 0x0003
> Invoking createStream
> FCSubscribe: mp4:stream54.f4v
> Invoking FCSubscribe
> RTMP_ClientPacket, received: invoke 29 bytes
> (object begin)
> Property: <Name:           no-name., STRING:    _result>
> Property: <Name:           no-name., NUMBER:    2.00>
> Property: NULL
> Property: <Name:           no-name., NUMBER:    1.00>
> (object end)
> HandleInvoke, server invoking <_result>
> HandleInvoke, received result for method call <createStream>
> SendPlay, seekTime=0, stopTime=0, sending play: mp4:stream54.f4v
> Invoking play
> sending ctrl. type: 0x0003
> RTMP_ClientPacket, received: invoke 21 bytes
> (object begin)
> Property: <Name:           no-name., STRING:    _result>
> Property: <Name:           no-name., NUMBER:    3.00>
> Property: NULL
> Property: NULL
> (object end)
> HandleInvoke, server invoking <_result>
> HandleInvoke, received result for method call <FCSubscribe>
> HandleChangeChunkSize, received: chunk size change to 4096
> HandleCtrl, received ctrl. type: 0, len: 6
> HandleCtrl, Stream Begin 1
> RTMP_ClientPacket, received: invoke 166 bytes
> (object begin)
> Property: <Name:           no-name., STRING:    onStatus>
> Property: <Name:           no-name., NUMBER:    0.00>
> Property: NULL
> Property: <Name:           no-name., OBJECT>
> (object begin)
> Property: <Name:              level, STRING:    status>
> Property: <Name:               code, STRING:    NetStream.Play.Reset>
> Property: <Name:        description, STRING:    Playing and resetting
> stream54.f4v.>
> Property: <Name:            details, STRING:    stream54.f4v>
> Property: <Name:           clientid, STRING:    oAAIAAAA>
> (object end)
> (object end)
> HandleInvoke, server invoking <onStatus>
> HandleInvoke, onStatus: NetStream.Play.Reset
> RTMP_ClientPacket, received: invoke 160 bytes
> (object begin)
> Property: <Name:           no-name., STRING:    onStatus>
> Property: <Name:           no-name., NUMBER:    0.00>
> Property: NULL
> Property: <Name:           no-name., OBJECT>
> (object begin)
> Property: <Name:              level, STRING:    status>
> Property: <Name:               code, STRING:    NetStream.Play.Start>
> Property: <Name:        description, STRING:    Started playing
> stream54.f4v.>
> Property: <Name:            details, STRING:    stream54.f4v>
> Property: <Name:           clientid, STRING:    oAAIAAAA>
> (object end)
> (object end)
> HandleInvoke, server invoking <onStatus>
> HandleInvoke, onStatus: NetStream.Play.Start
> RTMP_ClientPacket, received: notify 24 bytes
> (object begin)
> Property: <Name:           no-name., STRING:    |RtmpSampleAccess>
> Property: <Name:           no-name., BOOLEAN:   FALSE>
> Property: <Name:           no-name., BOOLEAN:   TRUE>
> (object end)
> HandleCtrl, received ctrl. type: 31, len: 6
> HandleCtrl, Stream BufferEmpty 1
> HandleCtrl, received ctrl. type: 32, len: 6
> HandleCtrl, Stream BufferReady 1
> ignoring too small video packet: size: 2
> HandleCtrl, received ctrl. type: 31, len: 6
> HandleCtrl, Stream BufferEmpty 1
> HandleCtrl, received ctrl. type: 32, len: 6
> HandleCtrl, Stream BufferReady 1
> HandleCtrl, received ctrl. type: 31, len: 6
> HandleCtrl, Stream BufferEmpty 1
> HandleCtrl, received ctrl. type: 32, len: 6
> HandleCtrl, Stream BufferReady 1
> HandleCtrl, received ctrl. type: 31, len: 6
> HandleCtrl, Stream BufferEmpty 1
> HandleCtrl, received ctrl. type: 32, len: 6
> HandleCtrl, Stream BufferReady 1
> ignoring too small video packet: size: 2
> HandleCtrl, received ctrl. type: 31, len: 6
> HandleCtrl, Stream BufferEmpty 1
> HandleCtrl, received ctrl. type: 32, len: 6
> HandleCtrl, Stream BufferReady 1
> ignoring too small audio packet: size: 0
> HandleCtrl, received ctrl. type: 31, len: 6
> HandleCtrl, Stream BufferEmpty 1
> HandleCtrl, received ctrl. type: 32, len: 6
> HandleCtrl, Stream BufferReady 1
> HandleCtrl, received ctrl. type: 31, len: 6
> HandleCtrl, Stream BufferEmpty 1
> HandleCtrl, received ctrl. type: 32, len: 6
> HandleCtrl, Stream BufferReady 1
> HandleCtrl, received ctrl. type: 31, len: 6
> HandleCtrl, Stream BufferEmpty 1
> HandleCtrl, received ctrl. type: 32, len: 6
> HandleCtrl, Stream BufferReady 1
> HandleCtrl, received ctrl. type: 31, len: 6
> HandleCtrl, Stream BufferEmpty 1
> HandleCtrl, received ctrl. type: 32, len: 6
> HandleCtrl, Stream BufferReady 1
> HandleCtrl, received ctrl. type: 31, len: 6
> HandleCtrl, Stream BufferEmpty 1
> HandleCtrl, received ctrl. type: 32, len: 6
> HandleCtrl, Stream BufferReady 1
> HandleCtrl, received ctrl. type: 31, len: 6
> HandleCtrl, Stream BufferEmpty 1
> HandleCtrl, received ctrl. type: 32, len: 6
> HandleCtrl, Stream BufferReady 1
> HandleCtrl, received ctrl. type: 31, len: 6
> HandleCtrl, Stream BufferEmpty 1
> HandleCtrl, received ctrl. type: 32, len: 6
> HandleCtrl, Stream BufferReady 1
> HandleCtrl, received ctrl. type: 31, len: 6
> HandleCtrl, Stream BufferEmpty 1
> HandleCtrl, received ctrl. type: 32, len: 6
> HandleCtrl, Stream BufferReady 1
> HandleCtrl, received ctrl. type: 31, len: 6
> HandleCtrl, Stream BufferEmpty 1
> HandleCtrl, received ctrl. type: 32, len: 6
> HandleCtrl, Stream BufferReady 1
> ignoring too small video packet: size: 5
> ignoring too small audio packet: size: 0
> RTMP_ClientPacket, received: invoke 149 bytes
> (object begin)
> Property: <Name:           no-name., STRING:    onStatus>
> Property: <Name:           no-name., NUMBER:    0.00>
> Property: NULL
> Property: <Name:           no-name., OBJECT>
> (object begin)
> Property: <Name:              level, STRING:    status>
> Property: <Name:               code, STRING:
> NetStream.Play.UnpublishNotify>
> Property: <Name:        description, STRING:    stream54.f4v is now
> unpublished.>
> Property: <Name:           clientid, STRING:    oAAIAAAA>
> (object end)
> (object end)
> HandleInvoke, server invoking <onStatus>
> HandleInvoke, onStatus: NetStream.Play.UnpublishNotify
> Invoking deleteStream
> Got Play. Complete or Play. Stop from server. Assuming stream is complete
> [flv @ 0x296ee00] Stream discovered after head already parsed
> [h263 @ 0x2ac80c0] Bad marker
> [h263 @ 0x2ac80c0] header damaged
> [flv @ 0x296ee00] decoding for stream 1 failed
> [flv @ 0x296ee00] Could not find codec parameters for stream 1 (Video:
> h263, yuv420p): unspecified size
> Consider increasing the value for the 'analyzeduration' and 'probesize'
> options
> Input #0, flv, from '(RTMP STREAM) app=myapp conn=S:ffmpeg
> playpath=mp4:stream54.f4v live=1':
>   Duration: N/A, start: 0.000000, bitrate: N/A
>     Stream #0:0: Video: h264 (Baseline), yuv420p, 320x240 [SAR 1:1 DAR
> 4:3], 15 tbr, 1k tbn, 30 tbc
>     Stream #0:1: Video: h263, yuv420p, 1k tbr, 1k tbn
> [graph 0 input from stream 0:0 @ 0x295fce0] w:320 h:240 pixfmt:yuv420p
> tb:1/1000 fr:15/1 sar:1/1 sws_param:flags=2
> [auto-inserted scaler 0 @ 0x2aa43e0] w:iw h:ih flags:'0x4' interl:0
> [format @ 0x2a15ee0] auto-inserting filter 'auto-inserted scaler 0'
> between the filter 'Parsed_null_0' and the filter 'format'
> [auto-inserted scaler 0 @ 0x2aa43e0] w:320 h:240 fmt:yuv420p sar:1/1 ->
> w:320 h:240 fmt:yuvj420p sar:1/1 flags:0x4
> Output #0, image2, to './imgs/image%04d.jpg':
>   Metadata:
>     encoder         : Lavf55.8.102
>     Stream #0:0: Video: mjpeg, yuvj420p, 320x240 [SAR 1:1 DAR 4:3],
> q=2-31, 200 kb/s, 90k tbn, 15 tbc
> Stream mapping:
>   Stream #0:0 -> #0:0 (h264 -> mjpeg)
> Press [q] to stop, [?] for help
> *** drop!
>     Last message repeated 28 times
> [h264 @ 0x2bb0860] Cannot use next picture in error concealment
> [h264 @ 0x2bb0860] concealing 53 DC, 53 AC, 53 MV errors in P frame
> *** drop!
>     Last message repeated 3 times
> No more output streams to write to, finishing.
> [image2 @ 0x2a5b980] Could not open file : ./imgs/image0001.jpg
> av_interleaved_write_frame(): Input/output error

New description:

 I am trying to receive as input a RTMP stream from Flash Media Server,
 encoded with h.264(BASELINE, Level 3.1) and save a sequence of JPEG images
 in realtime.
 If I try this kind of conversion when streaming without h.264 (With
 Sorenson codec), the command works just fine.

 Command:
 {{{
 ffmpeg -y -re -loglevel verbose -i "(RTMP STREAM) app=myapp conn=S:ffmpeg
 playpath=mp4:stream54.f4v live=1" -an -r 15 -f image2 ./imgs/image%04d.jpg

 ffmpeg version N-53811-gc8faa47 Copyright (c) 2000-2013 the FFmpeg
 developers
   built on Jun  3 2013 13:01:58 with gcc 4.1.2 (GCC) 20080704 (Red Hat
 4.1.2-54)
   configuration: --enable-version3 --enable-libopencore-amrnb --enable-
 libopencore-amrwb --enable-libfaac --enable-libmp3lame --enable-libtheora
 --enable-libvorbis --enable-libx264 --enable-libxvid --enable-librtmp
 --enable-gpl --enable-postproc --enable-nonfree
   libavutil      52. 34.100 / 52. 34.100
   libavcodec     55. 15.100 / 55. 15.100
   libavformat    55.  8.102 / 55.  8.102
   libavdevice    55.  2.100 / 55.  2.100
   libavfilter     3. 74.101 /  3. 74.101
   libswscale      2.  3.100 /  2.  3.100
   libswresample   0. 17.102 /  0. 17.102
   libpostproc    52.  3.100 / 52.  3.100

 This is the log I am getting:
 Parsing...
 Parsed protocol: 0
 Parsed host    : localhost
 Parsed app     :
 RTMP_Connect1, ... connected, handshaking
 HandShake: Type Answer   : 03
 HandShake: Server Uptime : 18848860
 HandShake: FMS Version   : 4.5.1.1
 HandShake: Handshaking finished....
 RTMP_Connect1, handshaked
 Invoking connect
 HandleServerBW: server BW = 2500000
 HandleClientBW: client BW = 2500000 2
 HandleChangeChunkSize, received: chunk size change to 4096
 RTMP_ClientPacket, received: invoke 242 bytes
 (object begin)
 Property: <Name:           no-name., STRING:    _result>
 Property: <Name:           no-name., NUMBER:    1.00>
 Property: <Name:           no-name., OBJECT>
 (object begin)
 Property: <Name:             fmsVer, STRING:    FMS/4,5,1,8003>
 Property: <Name:       capabilities, NUMBER:    255.00>
 Property: <Name:               mode, NUMBER:    1.00>
 (object end)
 Property: <Name:           no-name., OBJECT>
 (object begin)
 Property: <Name:              level, STRING:    status>
 Property: <Name:               code, STRING:
 NetConnection.Connect.Success>
 Property: <Name:        description, STRING:    Connection succeeded.>
 Property: <Name:     objectEncoding, NUMBER:    0.00>
 Property: <Name:               data, OBJECT>
 (object begin)
 Property: <Name:            version, STRING:    4,5,1,8003>
 (object end)
 (object end)
 (object end)
 HandleInvoke, server invoking <_result>
 HandleInvoke, received result for method call <connect>
 sending ctrl. type: 0x0003
 Invoking createStream
 FCSubscribe: mp4:stream54.f4v
 Invoking FCSubscribe
 RTMP_ClientPacket, received: invoke 29 bytes
 (object begin)
 Property: <Name:           no-name., STRING:    _result>
 Property: <Name:           no-name., NUMBER:    2.00>
 Property: NULL
 Property: <Name:           no-name., NUMBER:    1.00>
 (object end)
 HandleInvoke, server invoking <_result>
 HandleInvoke, received result for method call <createStream>
 SendPlay, seekTime=0, stopTime=0, sending play: mp4:stream54.f4v
 Invoking play
 sending ctrl. type: 0x0003
 RTMP_ClientPacket, received: invoke 21 bytes
 (object begin)
 Property: <Name:           no-name., STRING:    _result>
 Property: <Name:           no-name., NUMBER:    3.00>
 Property: NULL
 Property: NULL
 (object end)
 HandleInvoke, server invoking <_result>
 HandleInvoke, received result for method call <FCSubscribe>
 HandleChangeChunkSize, received: chunk size change to 4096
 HandleCtrl, received ctrl. type: 0, len: 6
 HandleCtrl, Stream Begin 1
 RTMP_ClientPacket, received: invoke 166 bytes
 (object begin)
 Property: <Name:           no-name., STRING:    onStatus>
 Property: <Name:           no-name., NUMBER:    0.00>
 Property: NULL
 Property: <Name:           no-name., OBJECT>
 (object begin)
 Property: <Name:              level, STRING:    status>
 Property: <Name:               code, STRING:    NetStream.Play.Reset>
 Property: <Name:        description, STRING:    Playing and resetting
 stream54.f4v.>
 Property: <Name:            details, STRING:    stream54.f4v>
 Property: <Name:           clientid, STRING:    oAAIAAAA>
 (object end)
 (object end)
 HandleInvoke, server invoking <onStatus>
 HandleInvoke, onStatus: NetStream.Play.Reset
 RTMP_ClientPacket, received: invoke 160 bytes
 (object begin)
 Property: <Name:           no-name., STRING:    onStatus>
 Property: <Name:           no-name., NUMBER:    0.00>
 Property: NULL
 Property: <Name:           no-name., OBJECT>
 (object begin)
 Property: <Name:              level, STRING:    status>
 Property: <Name:               code, STRING:    NetStream.Play.Start>
 Property: <Name:        description, STRING:    Started playing
 stream54.f4v.>
 Property: <Name:            details, STRING:    stream54.f4v>
 Property: <Name:           clientid, STRING:    oAAIAAAA>
 (object end)
 (object end)
 HandleInvoke, server invoking <onStatus>
 HandleInvoke, onStatus: NetStream.Play.Start
 RTMP_ClientPacket, received: notify 24 bytes
 (object begin)
 Property: <Name:           no-name., STRING:    |RtmpSampleAccess>
 Property: <Name:           no-name., BOOLEAN:   FALSE>
 Property: <Name:           no-name., BOOLEAN:   TRUE>
 (object end)
 HandleCtrl, received ctrl. type: 31, len: 6
 HandleCtrl, Stream BufferEmpty 1
 HandleCtrl, received ctrl. type: 32, len: 6
 HandleCtrl, Stream BufferReady 1
 ignoring too small video packet: size: 2
 HandleCtrl, received ctrl. type: 31, len: 6
 HandleCtrl, Stream BufferEmpty 1
 HandleCtrl, received ctrl. type: 32, len: 6
 HandleCtrl, Stream BufferReady 1
 HandleCtrl, received ctrl. type: 31, len: 6
 HandleCtrl, Stream BufferEmpty 1
 HandleCtrl, received ctrl. type: 32, len: 6
 HandleCtrl, Stream BufferReady 1
 HandleCtrl, received ctrl. type: 31, len: 6
 HandleCtrl, Stream BufferEmpty 1
 HandleCtrl, received ctrl. type: 32, len: 6
 HandleCtrl, Stream BufferReady 1
 ignoring too small video packet: size: 2
 HandleCtrl, received ctrl. type: 31, len: 6
 HandleCtrl, Stream BufferEmpty 1
 HandleCtrl, received ctrl. type: 32, len: 6
 HandleCtrl, Stream BufferReady 1
 ignoring too small audio packet: size: 0
 HandleCtrl, received ctrl. type: 31, len: 6
 HandleCtrl, Stream BufferEmpty 1
 HandleCtrl, received ctrl. type: 32, len: 6
 HandleCtrl, Stream BufferReady 1
 HandleCtrl, received ctrl. type: 31, len: 6
 HandleCtrl, Stream BufferEmpty 1
 HandleCtrl, received ctrl. type: 32, len: 6
 HandleCtrl, Stream BufferReady 1
 HandleCtrl, received ctrl. type: 31, len: 6
 HandleCtrl, Stream BufferEmpty 1
 HandleCtrl, received ctrl. type: 32, len: 6
 HandleCtrl, Stream BufferReady 1
 HandleCtrl, received ctrl. type: 31, len: 6
 HandleCtrl, Stream BufferEmpty 1
 HandleCtrl, received ctrl. type: 32, len: 6
 HandleCtrl, Stream BufferReady 1
 HandleCtrl, received ctrl. type: 31, len: 6
 HandleCtrl, Stream BufferEmpty 1
 HandleCtrl, received ctrl. type: 32, len: 6
 HandleCtrl, Stream BufferReady 1
 HandleCtrl, received ctrl. type: 31, len: 6
 HandleCtrl, Stream BufferEmpty 1
 HandleCtrl, received ctrl. type: 32, len: 6
 HandleCtrl, Stream BufferReady 1
 HandleCtrl, received ctrl. type: 31, len: 6
 HandleCtrl, Stream BufferEmpty 1
 HandleCtrl, received ctrl. type: 32, len: 6
 HandleCtrl, Stream BufferReady 1
 HandleCtrl, received ctrl. type: 31, len: 6
 HandleCtrl, Stream BufferEmpty 1
 HandleCtrl, received ctrl. type: 32, len: 6
 HandleCtrl, Stream BufferReady 1
 HandleCtrl, received ctrl. type: 31, len: 6
 HandleCtrl, Stream BufferEmpty 1
 HandleCtrl, received ctrl. type: 32, len: 6
 HandleCtrl, Stream BufferReady 1
 ignoring too small video packet: size: 5
 ignoring too small audio packet: size: 0
 RTMP_ClientPacket, received: invoke 149 bytes
 (object begin)
 Property: <Name:           no-name., STRING:    onStatus>
 Property: <Name:           no-name., NUMBER:    0.00>
 Property: NULL
 Property: <Name:           no-name., OBJECT>
 (object begin)
 Property: <Name:              level, STRING:    status>
 Property: <Name:               code, STRING:
 NetStream.Play.UnpublishNotify>
 Property: <Name:        description, STRING:    stream54.f4v is now
 unpublished.>
 Property: <Name:           clientid, STRING:    oAAIAAAA>
 (object end)
 (object end)
 HandleInvoke, server invoking <onStatus>
 HandleInvoke, onStatus: NetStream.Play.UnpublishNotify
 Invoking deleteStream
 Got Play. Complete or Play. Stop from server. Assuming stream is complete
 [flv @ 0x296ee00] Stream discovered after head already parsed
 [h263 @ 0x2ac80c0] Bad marker
 [h263 @ 0x2ac80c0] header damaged
 [flv @ 0x296ee00] decoding for stream 1 failed
 [flv @ 0x296ee00] Could not find codec parameters for stream 1 (Video:
 h263, yuv420p): unspecified size
 Consider increasing the value for the 'analyzeduration' and 'probesize'
 options
 Input #0, flv, from '(RTMP STREAM) app=myapp conn=S:ffmpeg
 playpath=mp4:stream54.f4v live=1':
   Duration: N/A, start: 0.000000, bitrate: N/A
     Stream #0:0: Video: h264 (Baseline), yuv420p, 320x240 [SAR 1:1 DAR
 4:3], 15 tbr, 1k tbn, 30 tbc
     Stream #0:1: Video: h263, yuv420p, 1k tbr, 1k tbn
 [graph 0 input from stream 0:0 @ 0x295fce0] w:320 h:240 pixfmt:yuv420p
 tb:1/1000 fr:15/1 sar:1/1 sws_param:flags=2
 [auto-inserted scaler 0 @ 0x2aa43e0] w:iw h:ih flags:'0x4' interl:0
 [format @ 0x2a15ee0] auto-inserting filter 'auto-inserted scaler 0'
 between the filter 'Parsed_null_0' and the filter 'format'
 [auto-inserted scaler 0 @ 0x2aa43e0] w:320 h:240 fmt:yuv420p sar:1/1 ->
 w:320 h:240 fmt:yuvj420p sar:1/1 flags:0x4
 Output #0, image2, to './imgs/image%04d.jpg':
   Metadata:
     encoder         : Lavf55.8.102
     Stream #0:0: Video: mjpeg, yuvj420p, 320x240 [SAR 1:1 DAR 4:3],
 q=2-31, 200 kb/s, 90k tbn, 15 tbc
 Stream mapping:
   Stream #0:0 -> #0:0 (h264 -> mjpeg)
 Press [q] to stop, [?] for help
 *** drop!
     Last message repeated 28 times
 [h264 @ 0x2bb0860] Cannot use next picture in error concealment
 [h264 @ 0x2bb0860] concealing 53 DC, 53 AC, 53 MV errors in P frame
 *** drop!
     Last message repeated 3 times
 No more output streams to write to, finishing.
 [image2 @ 0x2a5b980] Could not open file : ./imgs/image0001.jpg
 av_interleaved_write_frame(): Input/output error
 }}}

--

-- 
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/2651#comment:2>
FFmpeg <http://ffmpeg.org>
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