Den 19.12.2021 16:40, skrev Andrew Randrianasulu:
On Sunday, December 19, 2021, Terje J. Hanssen
<[email protected] <mailto:[email protected]>> wrote:
Thanks, script testrun executed with attached output here.
Test-run_Intra-frame_key_word
As seen below from the summary table, all files except the MPEG-2
generated "SD-MP2-50.mpg" without the ffmpeg -intra flag set,
contains all Intra-frames only:
-------------------------------------------------------
du -sh SD*.* # key_frame=1 # key_frame=0
(# I-frames) (# non-I-frames)
284M SD-MOV.mov 746 0
205M SD-DV50.dv 745 0
186M SD-MP2I50.mpg 745 0
153M SD-MP2I-.mpg 745 0
186M SD-MP2-50.mpg 63 682
146M SD-MP2I50-an.m2v 745 0
good!
but a bit concerned 746 vs 745 frame count. Are we losing one frame
somewhere?
To repeat:
1. SD-MOV.mov (ProRes) was the initial record source
2. SD-DV50.dv was encoded from ProRes using a simple ffmpeg target (preset)
ffmpeg -i SD-MOV.mov -target pal-dv50 SD-DV50.dv
3. The SD-MP2* were encoded from SD-DV50.dv using ffmpeg
All ffmpeg generated files has the same frame counts
My take:
The single frame difference seems to occure from step 1 - 2, or the
script doesn't count 1 indentical as the ffmpeg generated 2 and 3.
Counts matched # key_frame=1 (I-frames)
./kfrm.sh SD-MOV.mov | grep -c key_frame=1
Counts other (unmatched) than key_frame=1
./kfrm.sh SD-MOV.mov | grep -v -c key_frame=1
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