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This improves readability a lot and prevent us from reinventing the wheel.

Refactor video_filters in modules/stream_out/transcode.c by abstracting common code into 2 new functiosn transcode_video_filter_new() and transcode_video_filter_close().

misc/objects.c: Don't rely on vlc_object_destroy() to destroy objects, but expects vlc_object_release to do it when the refcount goes to zero.
* Meaning, that when created objects gets a refcount to 1.
* Destroying is instantaneous and we don't have to poll for a few secondss or so to wait until the object's refcount reach 0.
* We now track vlc_object_t's mem leaks when libvlc_global is released (Hard error for now, so they don't get unoticed)
* We fail hard if an object is released with a refcount of 1 without being detached from its parent and its children, to make sure such cases don't go unoticed.
(make test or make check still pass after that one. VLC is known to leak one object when no module is loaded, this must be fixed).

Restore resizing functionality with ffmpeg swscale. Please check if crop and padding work as expected and report any regressions.

    rtp: add the prototype for rtp_packetize_h264_nal()
    transcode: transcode_{spu,audio}_close(): removes unused argument
    mosaic_bridge: video_del_buffer(): removes unused argument

Missing some cases that I could not test.
Also ffmpeg/chroma.c is locked, so I can but leave it broken.
Fix is for the remaining modules is obvious and the issue is easy to detect.

Revert [19071] because it is broken. It doesn't allow channel or samplerate changes for fourcc mp4a even when explicitly requested by the user. Specify channels=2 and samplerate=NNNN for fourcc mp4a if you want AAC SBR.

Use id->p_decoder->fmt_out as input for id->p_encoder->fmt_in. Removes double initialisation of id->p_encoder->fmt_in (es_format_Init()).

 As a side effect, it fixed a potential segfault (race condition) when using
sout-keep (but I am not sure if we have a stream_out module that can show the
problem)

 sout_UpdateStatistic still uses input internal data and that need to
be fixed. Audio output need such a clean too.

are dynamically added when detected.
(Decoder/Packetizer support not yet commited)

This screws up any audio codec that does not support transrating.
There is something fishy here.

Transcode: We want to be strict when calling module_Need for audio filter, video filters and the deinterlace video filter too. (This fixes a problem with deinterlace not loading on my computer)