In choose_nal_type in esdotc.c there is a boolean value rec_point_required. It you set it to FALSE any I pic is considered a random access point.
The field recovery_frame_cnt is not used (as if it was 0). If it is != 0 a warning message is printed.
The fields broken_link_flag, exact_match_flag and changing_slice_group_idc are not considered (as 0).
In the final message the max, min and mean duration of a GOP are shown. For H.264 streams this is defined as the distance between 2 random access points. If no full GOP is found this info is not displayed.
The -gop switch works as before.
In esdots a function choose_nal_type has been added.
In nalunit.c a function read_SEI_recovery_point has been added.
The structure nal_SEI_recovery_data has been added, in order to cope with the recovery_point message. It's added to nal_innards too. See nalunit_defns.h
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- For MPEG-2 streams it outputs informations about the size of a Gropu Of Pictures (GOP): min, max and average duration in sec. Video is supposed to be @25fps.
- For AVC streams, where the GOP is not formally defined, it computes the same date looking at the interval between two I or IDR frames (whichever comes first).
Using the switch -gop display the duration of each GOP (or pseudo-GOP fir AVC)
NOTE that a new function hab been added:
static char choose_nal_type(access_unit_p access_unit, int verbose);
Called by dots_by_access_unit, it returns a single character which specifies the type of the access unit.
+ tools.txt has been modified describing this new functionality and switch.
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extra : convert_revision : svn%3Aeff31bef-be4a-0410-a8fe-e47997df2690/trunk%408
(with -v) didn't match the code, and the whole thing was rather wrong.
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tibs