#337: FFmpeg's isaTTY check makes programatically parsing stderr impossible
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Reporter: tommedema | Owner: michael
Type: defect | Status: new
Priority: normal | Component: FFmpeg
Version: git-master | Keywords: console tty loglevel programming
Blocked By: | interaction debug progress
Reproduced: 1 | Blocking:
| Analyzed: 0
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'''What you were trying to accomplish (e.g., "I am trying to transcode
from this format to that format...")'''
I am programatically spawning FFmpeg, trying to parse "progress" info from
stderr using the following regular expression:
/size=[\b]*([0-9]+)kB/
An example entry:
52kB time=00:00:11.43 bitrate= 37.4kbits/s
These entries are displayed just fine when I run ffmpeg in the console
(TTY).
'''The problem you encountered (e.g., "ffmpeg crashed" or "The output
video was all green")'''
When I spawn a ffmpeg process programatically, ffmpeg refuces to listen to
the -loglevel command because it performs a is-a-tty check and seems to
not provide as much debug information when it is not a TTY (which is the
case when spawning programatically and piping stderr data to certain
streams).
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Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/337>
FFmpeg <http://ffmpeg.org>
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