Many warnings shown when decoding some latm samples

[Carl Eugen Hoyos]

The samples globo\ hd\ 20120424\ champions\ league\ paulonline.ts and VasHD.mpg in ​http://samples.ffmpeg.org/ffmpeg-bugs/trac/ticket4544/ show many warnings on decoding - ac->oc[1].m4ac.chan_config is reset in aac_decode_frame_int() after output_configure() did not return an error.

$ ffmpeg -i VasHD.mpg -t 5 -f null -
ffmpeg version N-83533-gada281d Copyright (c) 2000-2017 the FFmpeg developers
  built with gcc 4.7 (SUSE Linux)
  configuration: --enable-gpl
  libavutil      55. 47.100 / 55. 47.100
  libavcodec     57. 80.100 / 57. 80.100
  libavformat    57. 66.102 / 57. 66.102
  libavdevice    57.  2.100 / 57.  2.100
  libavfilter     6. 73.100 /  6. 73.100
  libswscale      4.  3.101 /  4.  3.101
  libswresample   2.  4.100 /  2.  4.100
  libpostproc    54.  2.100 / 54.  2.100
[h264 @ 0x216ff40] SPS unavailable in decode_picture_timing
[h264 @ 0x216ff40] non-existing PPS 0 referenced
[h264 @ 0x216ff40] SPS unavailable in decode_picture_timing
[h264 @ 0x216ff40] non-existing PPS 0 referenced
[h264 @ 0x216ff40] decode_slice_header error
[h264 @ 0x216ff40] no frame!
[h264 @ 0x216ff40] SPS unavailable in decode_picture_timing
[h264 @ 0x216ff40] non-existing PPS 0 referenced
[h264 @ 0x216ff40] SPS unavailable in decode_picture_timing
[h264 @ 0x216ff40] non-existing PPS 0 referenced
[h264 @ 0x216ff40] decode_slice_header error
[h264 @ 0x216ff40] no frame!
[mpegts @ 0x216b3e0] start time for stream 3 is not set in estimate_timings_from_pts
[mpegts @ 0x216b3e0] start time for stream 4 is not set in estimate_timings_from_pts
[mpegts @ 0x216b3e0] PES packet size mismatch
    Last message repeated 1 times
[mpegts @ 0x216b3e0] Could not find codec parameters for stream 5 (Unknown: none ([5][0][0][0] / 0x0005)): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, mpegts, from 'VasHD.mpg':
  Duration: 00:01:00.08, start: 39229.160467, bitrate: 9240 kb/s
  Program 5
    Stream #0:0[0x208]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 50 tbr, 90k tbn, 50 tbc
    Stream #0:1[0x212](tam): Audio: aac_latm (HE-AAC) ([17][0][0][0] / 0x0011), 48000 Hz, 5.1, fltp
    Stream #0:2[0x213]: Audio: aac_latm (HE-AAC) ([17][0][0][0] / 0x0011), 48000 Hz, stereo, fltp
    Stream #0:3[0x21c](eng): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
    Stream #0:4[0x21f](tam): Subtitle: dvb_subtitle ([6][0][0][0] / 0x0006)
    Stream #0:5[0x244]: Unknown: none ([5][0][0][0] / 0x0005)
Output #0, null, to 'pipe:':
  Metadata:
    encoder         : Lavf57.66.102
    Stream #0:0: Video: wrapped_avframe, yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
    Metadata:
      encoder         : Lavc57.80.100 wrapped_avframe
    Stream #0:1(tam): Audio: pcm_s16le, 48000 Hz, 5.1, s16, 4608 kb/s
    Metadata:
      encoder         : Lavc57.80.100 pcm_s16le
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> wrapped_avframe (native))
  Stream #0:1 -> #0:1 (aac_latm (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
[aac_latm @ 0x22090a0] audio config changed
    Last message repeated 22 times
frame=  120 fps=0.0 q=-0.0 Lsize=N/A time=00:00:05.01 bitrate=N/A speed=  16x
video:58kB audio:2784kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown