[FFmpeg-devel] [PATCH] hevc - fix split function of parser
Ståle Kristoffersen
staalebk at ifi.uio.no
Fri Sep 25 14:46:42 CEST 2015
On 2015-09-01 at 16:27, Rainer Hochecker wrote:
>
> fix splitting extradata from ts
Hi,
this commit introduces a regression for me.
I'm trying to extract a thumb from the middle of a live TS, containing one
HEVC-stream.
Unfortunately I'm not sure if I can provide a sample, but before this patch
I would always get a good looking thumb, but with this patch I would for
the most part get a mostly gray frame.
If I generates a few more thumbnails i see that it eventually spits out the
same frame that ffmpeg before this patch produced as the first thumb, and
it looks OK.
However it is much more blocky than what the previous ffmpeg produced:
This is the command I want to run:
ffmpeg -nostdin -y -an -i hevc_fail.ts -vframes 1 -vf scale=iw*sar:ih thumb%d.jpg -v 100
Before this patch:
http://kolbu.ws/~chiller/thumb1.jpg
with this patch:
http://kolbu.ws/~chiller/thumb1.62bd8deef9005dbc9750e3bdc12fbf9b50392adc.jpg
If i let it generates a few more thumbs I end up with a "good" thumb:
http://kolbu.ws/~chiller/thumb18.62bd8deef9005dbc9750e3bdc12fbf9b50392adc.jpg
However, if you compare the two you will see that even the good thumb with
this patch is much more blocky.
--
Ståle Kristoffersen
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