Opened 16 years ago
Closed 15 years ago
#5259 closed patch (fixed)
YUYV to YUV420P conversion only uses top field
| Reported by: | Owned by: | ||
|---|---|---|---|
| Priority: | minor | Milestone: | unknown |
| Component: | mythtv | Version: | 0.21 |
| Severity: | medium | Keywords: | easy |
| Cc: | Ticket locked: | no |
Description
In NuppelVideoRecorder?.cpp, the YUYV to YUV420P conversion is described as following:
Treat lines in batches of two, first use color information, then don't
For interlaced content, this has the effect of ignoring one field of chroma information. When played back, the chroma sometimes looks like it is delayed behind the luma.
Even for progressive content, this isn't a particularly good resampling method.
Attachments (1)
Change History (5)
Changed 16 years ago by
| Attachment: | yuyv_yuv420p_interlaced.patch added |
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comment:1 Changed 16 years ago by
| Keywords: | easy added |
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| Type: | defect → patch |
comment:2 Changed 15 years ago by
| Milestone: | unknown → 0.22 |
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| Owner: | changed from Isaac Richards to danielk |
| Status: | new → accepted |
comment:3 Changed 15 years ago by
| Milestone: | 0.22 → unknown |
|---|---|
| Owner: | danielk deleted |
| Status: | accepted → new |
Oops, I thought this was for playback when I assigned this to myself. This is for YUYV->I420 conversion in the NuppelVideoRecorder?.
comment:4 Changed 15 years ago by
| Resolution: | → fixed |
|---|---|
| Status: | new → closed |
(In [21709]) Use libswscale to convert from YUYV to YUV420P in NuppelVideoRecorder?. Closes #5259. This is not a perfect implementation as the libswscale routines are not aware of the 'interlaced chroma problem' and do not attempt to fix it. It is, however, still an improvement over the existing code.
patch implementing interlaced chroma subsampling with linear interpolation