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  1. 21 Oct, 2017 1 commit
  3. 17 Oct, 2017 2 commits
  5. 11 Oct, 2017 1 commit
  7. 10 Oct, 2017 1 commit
  9. 03 Oct, 2017 4 commits
  11. 01 Oct, 2017 1 commit
  13. 30 Sep, 2017 1 commit
  15. 29 Sep, 2017 1 commit
  17. 28 Sep, 2017 1 commit
  19. 27 Sep, 2017 1 commit
  21. 24 Sep, 2017 1 commit
  23. 23 Sep, 2017 1 commit
  25. 18 Sep, 2017 2 commits
  27. 17 Sep, 2017 1 commit
  29. 15 Sep, 2017 2 commits
    • Thomas Mundt's avatar
      avfilter/interlace: prevent over-sharpening with the complex low-pass filter · a7f6bfdc
      Thomas Mundt authored 
      The complex vertical low-pass filter slightly over-sharpens the picture. This becomes visible when several transcodings are cascaded and the error potentises, e.g. some generations of HD->SD SD->HD.
To prevent this behaviour the destination pixel must not exceed the source pixel when the average of the pixels above and below is less than the source pixel. And the other way around.

Tested and approved in a visual transcoding cascade test by video professionals.
SSIM/PSNR test with the first generation of an HD->SD file as a reference against the 6th generation(3 x SD->HD HD->SD):
Results without the patch:
SSIM Y:0.956508 (13.615881) U:0.991601 (20.757750) V:0.993004 (21.551382) All:0.974405 (15.918463)
PSNR y:31.838009 u:48.424280 v:48.962711 average:34.759466 min:31.699297 max:40.857847
Results with the patch:
SSIM Y:0.970051 (15.236232) U:0.991883 (20.905857) V:0.993174 (21.658049) All:0.981290 (17.279202)
PSNR y:34.412108 u:48.504454 v:48.969496 average:37.264644 min:34.310637 max:42.373392
Signed-off-by: 's avatarThomas Mundt <tmundt75@gmail.com>
Signed-off-by: 's avatarMichael Niedermayer <michael@niedermayer.cc>
      a7f6bfdc
    • Thierry Foucu's avatar
      vf_fps: when reading EOF, using current_pts to duplicate the last frame if needed. · eea64ef4
      Thierry Foucu authored 
      Fix ticket #2674
Tested with examples from ticket 2674.
Signed-off-by: 's avatarMichael Niedermayer <michael@niedermayer.cc>
      eea64ef4
  31. 12 Sep, 2017 1 commit
  33. 08 Sep, 2017 2 commits
    • Clément Bœsch's avatar
      checkasm: use perf API on Linux ARM* · e0d56f09
      Clément Bœsch authored 
      On ARM platforms, accessing the PMU registers requires special user
access permissions. Since there is no other way to get accurate timers,
the current implementation of timers in FFmpeg rely on these registers.
Unfortunately, enabling user access to these registers on Linux is not
trivial, and generally involve compiling a random and unreliable github
kernel module, or patching somehow your kernel.

Such module is very unlikely to reach the upstream anytime soon. Quoting
Robin Murphin from ARM:

> Say you do give userspace direct access to the PMU; now run two or more
> programs at once that believe they can use the counters for their own
> "minimal-overhead" profiling. Have fun interpreting those results...
>
> And that's not even getting into the implications of scheduling across
> different CPUs, CPUidle, etc. where the PMU state is completely beyond
> userspace's control. In general, the plan to provide userspace with
> something which might happen to just about work in a few corner cases,
> but is meaningless, misleading or downright broken in all others, is to
> never do so.

As a result, the alternative is to use the Performance Monitoring Linux
API which makes use of these registers internally (assuming the PMU of
your ARM board is supported in the kernel, which is definitely not a
given...).

While the Linux API is obviously cross platform, it does have a
significant overhead which needs to be taken into account. As a result,
that mode is only weakly enabled on ARM platforms exclusively.

Note on the non flexibility of the implementation: the timers (native
FFmpeg vs Linux API) are selected at compilation time to prevent the
need of function calls, which would result in a negative impact on the
cycle counters.
      e0d56f09
    • Tobias Rapp's avatar
      fate: add test for asetnsamples filter with padding disabled · d47159a4
      Tobias Rapp authored 
      Adds another test for asetnsamples filter where padding of the last
frame is switched off. Renames the existing test to make the difference
obvious.
Tested-by: 's avatarMichael Niedermayer <michael@niedermayer.cc>
Signed-off-by: 's avatarTobias Rapp <t.rapp@noa-archive.com>
      d47159a4
  35. 07 Sep, 2017 2 commits
  37. 31 Aug, 2017 3 commits
  39. 30 Aug, 2017 3 commits
  41. 25 Aug, 2017 3 commits
  43. 24 Aug, 2017 1 commit
    • Dale Curtis's avatar
      avformat/mov: Fix trampling of ctts during seeks when sidx support is enabled. · 37e8edc9
      Dale Curtis authored 
      When sidx box support is enabled, the code will skip reading all
trun boxes (each containing ctts entries for samples inthat box).

If seeks are attempted before all ctts values are known, the old
code would dump ctts entries into the wrong location. These are
then used to compute pts values which leads to out of order and
incorrectly timestamped packets.

This patch fixes ctts processing by always using the index returned
by av_add_index_entry() as the ctts_data index. When the index gains
new entries old values are reshuffled as appropriate.

This approach makes sense since the mov demuxer is already relying
on the mapping of AVIndex entries to samples for correct demuxing.

As a result of this all ctts entries are now 1-count. A followup
change will be submitted to remove support for > 1 count entries
which will simplify seeking.

Notes for future improvement:
Probably there are other boxes (stts, stsc, etc) that are impacted
by this issue... this patch only attempts to fix ctts since it
completely breaks packet timestamping.

This patch continues using an array for the ctts data, which is not
the most ideal given the rearrangement that needs to happen (via
memmove as new entries are read in). Ideally AVIndex and the ctts
data would be set-type structures so addition is always worst case
O(lg(n)) instead of the O(n^2) that exists now; this slowdown is
noticeable during seeks.
Signed-off-by: 's avatarDale Curtis <dalecurtis@chromium.org>
Signed-off-by: 's avatarMichael Niedermayer <michael@niedermayer.cc>
      37e8edc9
  45. 16 Aug, 2017 2 commits
  47. 15 Aug, 2017 1 commit
  49. 10 Aug, 2017 1 commit