[FFmpeg-devel] [PATCH 3/5] mp3dec: parse initial silence padding information from lame tag

[Dale Curtis]

On Wed, Jul 4, 2012 at 2:15 PM, Michael Niedermayer <michaelni at gmx.at>wrote:

> And pass the information on to the lavf core.
>
> Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
> ---
>  libavformat/mp3dec.c |   28 ++++++++++++++++++++++++++++
>  1 file changed, 28 insertions(+)
>

Looks like this changed (broke?) dts/pts after seek-to-zero on some mp3
files:

$ libavformat/seek-test sync1.mp3 -frames 10 -seekback 0 | head -n 10
[mp3 @ 0x33da260] max_analyze_duration 5000000 reached at 5015510
ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:    417 size:
  626
ret: 0         st: 0 flags:1 dts: 0.026122 pts: 0.026122 pos:     -1 size:
  313
ret: 0         st: 0 flags:1 dts: 0.052245 pts: 0.052245 pos:     -1 size:
  313
ret: 0         st: 0 flags:1 dts: 0.078367 pts: 0.078367 pos:   1441 size:
  104
ret: 0         st: 0 flags:1 dts: 0.104490 pts: 0.104490 pos:     -1 size:
  104
ret: 0         st: 0 flags:1 dts: 0.130612 pts: 0.130612 pos:     -1 size:
  104
ret: 0         st: 0 flags:1 dts: 0.156735 pts: 0.156735 pos:     -1 size:
  104
ret: 0         st: 0 flags:1 dts: 0.182857 pts: 0.182857 pos:     -1 size:
  104
ret: 0         st: 0 flags:1 dts: 0.208980 pts: 0.208980 pos:     -1 size:
  104
ret: 0         st: 0 flags:1 dts: 0.235102 pts: 0.235102 pos:     -1 size:
  104

$ libavformat/seek-test sync1.mp3 -frames 10 | head -n 10
[mp3 @ 0x2bd0260] max_analyze_duration 5000000 reached at 5015510
ret: 0         st: 0 flags:1 dts:-0.025057 pts:-0.025057 pos:    417 size:
  626
ret: 0         st: 0 flags:1 dts: 0.001066 pts: 0.001066 pos:     -1 size:
  313
ret: 0         st: 0 flags:1 dts: 0.027188 pts: 0.027188 pos:     -1 size:
  313
ret: 0         st: 0 flags:1 dts: 0.053311 pts: 0.053311 pos:   1441 size:
  104
ret: 0         st: 0 flags:1 dts: 0.079433 pts: 0.079433 pos:     -1 size:
  104
ret: 0         st: 0 flags:1 dts: 0.105556 pts: 0.105556 pos:     -1 size:
  104
ret: 0         st: 0 flags:1 dts: 0.131678 pts: 0.131678 pos:     -1 size:
  104
ret: 0         st: 0 flags:1 dts: 0.157800 pts: 0.157800 pos:     -1 size:
  104
ret: 0         st: 0 flags:1 dts: 0.183923 pts: 0.183923 pos:     -1 size:
  104
ret: 0         st: 0 flags:1 dts: 0.210045 pts: 0.210045 pos:     -1 size:
  104

Test file here,
http://commondatastorage.googleapis.com/dalecurtis-shared/sync1.mp3

- dale