Bug #979

looks like some images are not stored in blob cache.

Added by Henrik Andersson almost 9 years ago. Updated over 8 years ago.

Status:FixedStart date:05/05/2012
Priority:NormalDue date:
Assignee:-% Done:

0%

Category:-
Target version:4.0
Found in version:git Platform:Linux

Description

I added some debug info when fetching the frame thumb as following output,
when key is not found a new frame decoded but not stored for next fetch..

imageloader [DEBUG]: looking up key file:///media/storage/Downloads/shrek.mp4#30--1-182-3 in cache
imageloader [DEBUG]: looking up key file:///media/storage/Downloads/shrek.mp4#265--1-46-3 in cache
imageloader [DEBUG]: key file:///media/storage/Downloads/shrek.mp4#265--1-46-3 NOT in cache
imageloader [DEBUG]: looking up key file:///media/storage/Downloads/shrek.mp4#265--1-46-3 in cache
imageloader [DEBUG]: key file:///media/storage/Downloads/shrek.mp4#265--1-46-3 NOT in cache

History

#1 Updated by Andreas Smas almost 9 years ago

Are they of the same dimensions?

#2 Updated by Andreas Smas almost 9 years ago

nevermind .. that's part of the URL

#3 Updated by Henrik Andersson almost 9 years ago

I have tested with hardcoded resolution but the first image is always successfully encoded,
must be something subsequental image retrevials from same file..

#4 Updated by Henrik Andersson almost 9 years ago

After some more testing this is definitely related to the reuse of ifv_ctx
when making subsequental calls to same video source, the first image is
always encoded and pushed to cache.

If i switch to another videostream the same procedure applies, first works
and subsequents fails.

#5 Updated by Henrik Andersson almost 9 years ago

Found the issue, avcodec_encode_video() doesn't accept an output buffer size
smaller then FF_MIN_BUFFER_SIZE and bails, with other words thumbs smaller then
16Kb will never be cached.

#6 Updated by Henrik Andersson almost 9 years ago

The following patch fixes the issue.

diff --git a/src/fileaccess/fa_imageloader.c b/src/fileaccess/fa_imageloader.c
index 859d06b..0131c6c 100644
--- a/src/fileaccess/fa_imageloader.c
+++ b/src/fileaccess/fa_imageloader.c
@ -488,6 +488,8 @ fa_image_from_video2(const char *url, const image_meta_t *im,
oframe->linesize0 = pm->pm_linesize;

size_t outputsize = pm->pm_linesize * h;
+      if(outputsize < FF_MIN_BUFFER_SIZE)
+       outputsize = FF_MIN_BUFFER_SIZE;
       void *output = malloc(outputsize);
       pngencoder->width = w;
       pngencoder->height = h;

#7 Updated by Henrik Andersson almost 9 years ago

The following patch fixes the issue.

diff --git a/src/fileaccess/fa_imageloader.c b/src/fileaccess/fa_imageloader.c
index 859d06b..0131c6c 100644
--- a/src/fileaccess/fa_imageloader.c
+++ b/src/fileaccess/fa_imageloader.c
@@ -488,6 +488,8 @@ fa_image_from_video2(const char *url, const image_meta_t *im,
       oframe->linesize[0] = pm->pm_linesize;

       size_t outputsize = pm->pm_linesize * h;
+      if(outputsize < FF_MIN_BUFFER_SIZE)
+       outputsize = FF_MIN_BUFFER_SIZE;
       void *output = malloc(outputsize);
       pngencoder->width = w;
       pngencoder->height = h;

#8 Updated by Andreas Smas almost 9 years ago

  • Status changed from New to Fixed

#9 Updated by Andreas Smas over 8 years ago

  • Target version set to 4.0

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