Recently 1ebefb8252 changed ffmpeg related logs to go through
CLOG. However, previously things coming from ffmpeg innards
via ffmpeg_log_callback were not logged at all, unless user
has explicitly asked for --debug-ffmpeg.
Many ffmpeg internal logs are not actionable and are missing
any context, thus now producing logs like:
"Could not update timestamps for discarded samples"
"Estimating duration from bitrate, this may be inaccurate"
"Could not find codec parameters for stream 2 (Audio: none (apac / 0x63617061), 48000 Hz, 2 channels, 396 kb/s): unknown codec"
"SCAN: Frame belongs to an unexpected GOP!"
"st: 2 edit list: 1 Missing key frame while searching for timestamp: 0"
Which is not very useful. Make it so that that errors/warnings coming
from ffmpeg_log_callback are treated as "info" CLOG level.
Pull Request: https://projects.blender.org/blender/blender/pulls/145172
e6a3c97259