Hello,
thanks for the quick answer! I upgraded my ffmpeg to version 2.8 and
still observe the same problem as stated before:
When timing the process I found that the decoding of the
first frame always takes twice as long as the decoding of all the other
frames.
Output of stream 1:
root@herglotz-panda:/ramcache# time -p taskset -c 0 ./ffmpeg -i
PeopleOnStreet_intra_1frames_QP10.bin -f rawvideo -y /dev/null
ffmpeg version 2.8 Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
configuration:
libavutil 54. 31.100 / 54. 31.100
libavcodec 56. 60.100 / 56. 60.100
libavformat 56. 40.101 / 56. 40.101
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 40.101 / 5. 40.101
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.101 / 1. 2.101
Input #0, hevc, from 'PeopleOnStreet_intra_1frames_QP10.bin':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: hevc (Main), yuv420p(tv), 2560x1600, 25 tbr,
1200k tbn, 25 tbc
Output #0, rawvideo, to '/dev/null':
Metadata:
encoder : Lavf56.40.101
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p,
2560x1600, q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
Metadata:
encoder : Lavc56.60.100 rawvideo
Stream mapping:
Stream #0:0 -> #0:0 (hevc (native) -> rawvideo (native))
Press [q] to stop, [?] for help
frame= 1 fps=0.5 q=-0.0 size= 6000kB time=00:00:00.04
bitrate=1228800.0kbiframe= 1 fps=0.5 q=-0.0 Lsize= 6000kB
time=00:00:00.04 bitrate=1228800.0kbits/s
video:6000kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.000000%
real 4.39
user 4.28
sys 0.10
Output of stream 2:
root@herglotz-panda:/ramcache# time -p taskset -c 0 ./ffmpeg -i
PeopleOnStreet_intra_2frames_QP10.bin -f rawvideo -y /dev/null
ffmpeg version 2.8 Copyright (c) 2000-2015 the FFmpeg developers
built with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
configuration:
libavutil 54. 31.100 / 54. 31.100
libavcodec 56. 60.100 / 56. 60.100
libavformat 56. 40.101 / 56. 40.101
libavdevice 56. 4.100 / 56. 4.100
libavfilter 5. 40.101 / 5. 40.101
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 2.101 / 1. 2.101
Input #0, hevc, from 'PeopleOnStreet_intra_2frames_QP10.bin':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: hevc (Main), yuv420p(tv), 2560x1600, 25 tbr,
1200k tbn, 25 tbc
Output #0, rawvideo, to '/dev/null':
Metadata:
encoder : Lavf56.40.101
Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p,
2560x1600, q=2-31, 200 kb/s, 25 fps, 25 tbn, 25 tbc
Metadata:
encoder : Lavc56.60.100 rawvideo
Stream mapping:
Stream #0:0 -> #0:0 (hevc (native) -> rawvideo (native))
Press [q] to stop, [?] for help
frame= 2 fps=0.9 q=-0.0 size= 12000kB time=00:00:00.08
bitrate=1228800.0kbiframe= 2 fps=0.5 q=-0.0 size= 12000kB
time=00:00:00.08 bitrate=1228800.0kbiframe= 2 fps=0.5 q=-0.0 Lsize=
12000kB time=00:00:00.08 bitrate=1228800.0kbits/s
video:12000kB audio:0kB subtitle:0kB other streams:0kB global
headers:0kB muxing overhead: 0.000000%
real 6.62
user 6.40
sys 0.21
This observation is also holds for sequences with a lower resolution.
Thanks for your help!
Christian
Am 18.09.2015 um 09:39 schrieb Moritz Barsnick:
Hallo Christian,
On Thu, Sep 17, 2015 at 10:48:16 +0200, Christian Herglotz wrote:
I've got a question regarding the decoding process for HEVC-coded
sequences. When timing the process I found that the decoding of the
first frame always takes twice as long as the decoding of all the other
frames.
While I'm happy to try to reproduce your problem and ask smart
questions, let me please point out:
ffmpeg version 2.1.git Copyright (c) 2000-2014 the FFmpeg developers
built on Feb 20 2014 16:27:13 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
This version of ffmpeg is extremely old, considering the amount of
development happening. Especially with such a "new" codec as HEVC, you
can expect many improvements over 18 months. And if ffmpeg
happens/happened to have a bug, it may very well have been fixed in the
meantime. Nobody here will help trying to identify a bug in such an old
version.
Please repeat your tests with a very recent version of ffmpeg, best is
if you build if from git HEAD.
Thanks,
Gruß,
Moritz
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--
Dipl.-Ing. Dipl.-Wirt.Ing. Christian Herglotz
Chair of Multimedia Communications and Signal Processing
Friedrich-Alexander University Erlangen-Nürnberg
Cauerstr. 7, D-91058 Erlangen, Germany
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