Using DummyReader with a custom cache with a Timeline can lead to
strange exceptions due to Timeline's buffering. Therefore adding a
note to the DummyReader documentation about that.
It is needed to avoid multiple definitions of AV_GET_CODEC_CONTEXT,
which is considered as an error with '-fno-common' which is default
since gcc-10.
Fixes: #511
BaseException is a python standard library exception class, so it's
not a great idea to redefine that name in our bindings. Renamed
to ExceptionBase, which is more in keeping with our class naming
system anyway.
The audio_codec and video_codec vars have type AVCodecContext.
Renaming them to reflect that makes the code easier to follow.
A couple of places in FFmpegUtilities macros that also used
context variables named _codec got the same fix.
- Reduced crazy-long line lengths by moving trailing comments to
previous line
- Added more openshot:: prefixing, which causes Doxygen to link to
the referenced object's documentation. (It doesn't always pick
up cross-class links, without the prefix.)
- The new ordering (with the frame rate AFTER width and height) doesn't
match the other signature, but it *is* consistent with the Timeline
constructor, and it just feels more natural
- Added overloaded-function notes to doxygen strings in FFmpegWriter.h
- Also added a warning about the argument order mismatch above
Add a new #define HAVE_HW_ACCEL, which is only set on FFmpeg 3.4+,
and use that to restrict the use of hw-accel features, leaving
IS_FFMPEG_3_2 to determine only whether code is compatible with
FFmpeg 3.2+.
