Main change is to rewrite the start/stop event handling to do fewer
passes and use simpler logic (it no longer has to track durations).
The temporary work audio codec is switched to flac; slightly lower hard
drive use and it avoids the 4-hour length limit of wav.
Some improvements to the video seeking when processing deskshare and
webcam videos, to avoid video dropouts.
Tweaks to the audio encoding quality settings.
Remove an unused function.
FreeSWITCH writes wav files >4GB long with incorrect values in the length
field in the header. Recalculate the length based on file size, and ensure
that ffmpeg reads the complete audio file rather than stopping.
If the video EDL merge function is applied to an EDL that has already
been edited to apply recording marks, the merge function will change the
video start times to incorrect values on edit points during the timestamp
recalculation.
The fix is pretty simple; just pull in the timestamps from the entry that's
being merged in and apply them to the relevant videos.
This bug doesn't currently cause any issues in the BigBlueButton recording
scripts, since the existing code does the merge before the start/stop marks
are applied. But to avoid surprises later, it would be good to fix this.
Makes it handle possibly corrupted video files with less chance of
breakage. Use features from newer ffmpeg release to simplify the video
trimming - in particular, using -ss as an input option is accurate now.
This is the point at which the start/stop events for the audio are
correctly matched up with eachother; doing it later can give
incorrect results if an 'end recording' event was missing from
the events file.
The previous version may have the beginning of the audio off by a bit,
since it was seeking in the audio file to find the start before the
stretch was applied.
There's some fairly major changes here, including:
* All audio is resampled to 48kHz stereo on input, allowing files with
non-standard or varying rates to be mixed
* The audio processing is now done in a single pass; ffmpeg reads all
inputs, concatenates them, and outputs one file.
The 'mkclean' tool reorganizes the encoded webm file to optimize it for
streaming. In particular, it moves the index to the start of the file.
This fixes streaming in Chrome, which otherwise had a very long delay
before playback started since it downloaded until it saw the index
before it started playback.
This needs a new dependency added to the bbb-record-core package to
pull in the mkclean tool.
We now use ghostscript to output pngs directly from the original pdf,
rather than using convert on the split pages. This should make corrupt
or strange pdfs less likely to cause issues.
As well, if a pdf page conversion fails (for any reason, including that
the original pdf is missing...) it will be logged, and a blank page
generated, and processing will continue.
