#4948 closed bug (fixed)
New SSE2/3 color conversion in the FFmpeg plug-in crashes Clockwerk/MediaConverter [patch]
| Reported by: | stippi | Owned by: | dlmcpaul |
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| Priority: | normal | Milestone: | R1 |
| Component: | Audio & Video/Codecs | Version: | R1/alpha1 |
| Keywords: | Cc: | Jens.Arm@… | |
| Blocked By: | Blocking: | ||
| Platform: | All |
Description
The subject says it all. I have not investigated this further, but have fixed the issue for me by simply using the existing swscale functionality, as I already did in the AVCodecEncoder. See attached patch. I can provide a test video (ca. 91 MB) that reproduces the problem when loaded in Clockwerk.
Attachments (3)
Change History (9)
by , 14 years ago
| Attachment: | Clockwerk_sse2_error.png added |
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comment:1 by , 14 years ago
| Cc: | added |
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by , 14 years ago
| Attachment: | use_swscale_patch.diff added |
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Patch which fixes the problem by re-using libswscale as the Encoder already does.
comment:2 by , 14 years ago
| Status: | new → assigned |
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Can you tell me more about the file?
Container, Codec, width, height?
comment:3 by , 14 years ago
As far as I was told, it happens with any file. The only file I tried is an AVCHD MPEG2 TS Container with H.264 encoding and AC3 5.1 sound. The video is 1440x1080 YCbCr420.
comment:4 by , 14 years ago
| Resolution: | → fixed |
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| Status: | assigned → closed |
Ok MediaConverter and I assume Clockwerk are using new to create the video buffers and this is not creating a 32 byte aligned pointer. For best performance with SSE2 code and later an aligned buffer is needed. MediaPlayer seems to do this ok.
I have added additional checks to detect alignment issues.
Should there perhaps be a media kit function to create media buffers so we can enforce the restrictions?
follow-up: 6 comment:5 by , 14 years ago
| Component: | Add-Ons → Audio & Video/Codecs |
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That would be nice, I guess.
BTW you forgot to mention that you fixed the problem in hrev34047.
comment:6 by , 14 years ago
Replying to axeld:
That would be nice, I guess.
There is the Media Kits Media Buffers. Not sure if they guarantee any alignment though.
SSE2 does have non-aligned loads and stores but they are pretty slow compared to aligned loads/stores.
BTW you forgot to mention that you fixed the problem in hrev34047.
Yep, sorry. I linked the commit to the trac issue but not the trac issue to the commit.
Clockwerk crash