Opened 5 years ago

Closed 5 years ago

Last modified 4 years ago

#499 closed defect (fixed)

H264 resolution change in flv not supported

Reported by: cehoyos Owned by:
Priority: normal Component: undetermined
Version: git-master Keywords: flv h264
Cc: Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no

Description

I will attach a Flash sample that contains a h264 stream with a resolution change (320x256 -> 720x576). The sample is said to play with Flash, a similar mp4 sample decodes fine with ffmpeg.
For the attached sample, FFmpeg only shows artefacts from the moment of the resolution change on.

$ ffmpeg -i resolutionchange.flv -qscale 2 -an out.avi
ffmpeg version N-32788-g394781a, Copyright (c) 2000-2011 the FFmpeg developers
  built on Sep 22 2011 14:49:18 with gcc 4.5.3
  configuration: --cc=/usr/local/gcc-4.5.3/bin/gcc
  libavutil    51. 17. 0 / 51. 17. 0
  libavcodec   53. 16. 0 / 53. 16. 0
  libavformat  53. 12. 0 / 53. 12. 0
  libavdevice  53.  4. 0 / 53.  4. 0
  libavfilter   2. 43. 2 /  2. 43. 2
  libswscale    2.  1. 0 /  2.  1. 0
[flv @ 0x12b6780] Estimating duration from bitrate, this may be inaccurate

Seems stream 0 codec frame rate differs from container frame rate: 48.00 (48/1) -> 25.00 (25/1)
Input #0, flv, from 'resolutionchange.flv':
  Duration: N/A, start: 0.002000, bitrate: N/A
    Stream #0.0: Video: h264 (High), yuv420p, 320x256 [SAR 1024:1024 DAR 5:4], 25 tbr, 1k tbn, 48 tbc
    Stream #0.1: Audio: aac, 44100 Hz, stereo, s16
[buffer @ 0x12be940] w:320 h:256 pixfmt:yuv420p tb:1/1000000 sar:1024/1024 sws_param:
[mpeg4 @ 0x12be120] Invalid pixel aspect ratio 1024/1024, limit is 255/255 reducing
Output #0, avi, to 'out.avi':
  Metadata:
    ISFT            : Lavf53.12.0
    Stream #0.0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 320x256 [SAR 1:1 DAR 5:4], q=2-31, 200 kb/s, 25 tbn, 25 tbc
Stream mapping:
  Stream #0.0 -> #0.0 (h264 -> mpeg4)
Press [q] to stop, [?] for help
[h264 @ 0x12bcbc0] left block unavailable for requested intra4x4 mode -1 at 0 1
[h264 @ 0x12bcbc0] error while decoding MB 0 1, bytestream (48355)
[h264 @ 0x12bcbc0] concealing 320 DC, 320 AC, 320 MV errors
[h264 @ 0x12bcbc0] concealing 233 DC, 233 AC, 233 MV errors
[h264 @ 0x12bcbc0] concealing 293 DC, 293 AC, 293 MV errors
[h264 @ 0x12bcbc0] concealing 258 DC, 258 AC, 258 MV errors
[h264 @ 0x12bcbc0] Reference 2 >= 2
[h264 @ 0x12bcbc0] error while decoding MB 9 2, bytestream (3556)
[h264 @ 0x12bcbc0] concealing 320 DC, 320 AC, 320 MV errors
[h264 @ 0x12bcbc0] Reference 3 >= 3
[h264 @ 0x12bcbc0] error while decoding MB 11 1, bytestream (16377)
[h264 @ 0x12bcbc0] concealing 320 DC, 320 AC, 320 MV errors
[h264 @ 0x12bcbc0] concealing 192 DC, 192 AC, 192 MV errors
[h264 @ 0x12bcbc0] Reference 5 >= 5

...

[h264 @ 0x12bcbc0] error while decoding MB 14 2, bytestream (9337)
[h264 @ 0x12bcbc0] concealing 315 DC, 315 AC, 315 MV errors
[h264 @ 0x12bcbc0] concealing 215 DC, 215 AC, 215 MV errors
[h264 @ 0x12bcbc0] AVC: nal size 17728
[h264 @ 0x12bcbc0] no frame!
Error while decoding stream #0.0
frame=  285 fps=  0 q=2.0 Lsize=    2102kB time=00:00:11.92 bitrate=1444.5kbits/s
video:2089kB audio:0kB global headers:0kB muxing overhead 0.610160%

No useful warning is shown that the decoding will fail or has failed.

Attachments (1)

resolutionchange.flv (2.3 MB) - added by cehoyos 5 years ago.

Change History (3)

Changed 5 years ago by cehoyos

comment:1 Changed 5 years ago by michael

  • Resolution set to fixed
  • Status changed from new to closed

comment:2 Changed 4 years ago by cehoyos

  • Keywords flv h264 added
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