[jokosher-devel] Jokosher bug review, fall 2007 aka "Long time no post"
- From: "Peteris Krisjanis" <pecisk gmail com>
- To: "Jokosher gnome" <jokosher-devel-list gnome org>
- Subject: [jokosher-devel] Jokosher bug review, fall 2007 aka "Long time no post"
- Date: Thu, 6 Dec 2007 22:03:01 +0200
Hi everyone!
I hope we haven't thrown a towel and given up. For some kick-start to
revitalize Jokosher development, I did some Jokosher bug review, to
see big picture.
Using Launchpad bug list and testing additionally Jokosher with newest
Gst CVS, I have made three clearly separated groups of bugs:
1. Most important ones, as seems to me, are seeking bugs, as they
usually ends with crashes and freezees. For now, most visible ones is:
a) import FLAC file, split in five, seven or more pieces and make them
separated with few sec of silence, playback and then do seeking
without pressing stop;
b) import FLAC/MP3 file, play it and after playhead has reached end,
seek it back (without pressing stop) for 5 secs and do it several
times. FLAC produce freeze after three four times, MP3 produced crash
after some six times, but I was unable to reproduce later;
c) also with FLAC, playing back without seeking forwards and backwards
is OK, however when I start to do actively seeking forward/backward
_while playing_, first it confuses pieces (plays another one instead
of first one) and later, crashes or freezes;
After extensive testing, it seems that seeking problems mostly
affects FLAC; MP3 seeking crashes are less predictable and rather hard
to reproduce, but they happen. Ogg Vorbis however drops some sec from
beginning of each seperated piece, and have imprecise waveforms, but
it survives insane seeking test and don't produce freeze/crash. At the
time of testing WAV seeking was broken in Gstreamer CVS, but thanks to
efforts Gstreamer team, it was fixed in one day and so it works like a
charm again, so no bugs here.
In short, seeking is good in Wav, Ogg Vorbis (however, it has
waveforms are out of order, and beginning of pieces are not played
back); random, but rare crashes/freezes with MP3; FLAC seeking bugs
are reproducible quite easy.
2. Second is general playback/record problems, First of all, Ogg
Vorbis streams (which is default dump format by know)
playbacks/records very badly if there is more than just one instrument
added to project (cracks, hisses, etc), waveforms are also out of
order, and start of pieces are not played back. None of this doesn't
affect FLAC, MP3 and Wav. End of recording gets snapped for FLAC and
Ogg Vorbis.
Also I think error dialog informing that there is some problem with
playback/record pipeline should be revised, also we need to stop
pipeline and clear the field, because now it stops, issues error
dialog, but still has some lingering processes in background.
After these two groups it seems that it would be sane to set WAV as
default dump format for now. Of course, work on improving support for
rest of formats should continue, as people will import lot of
mp3/oggs/flacs into their projects. Maybe we can import them as WAV
too.
3. Gstreamer/ALSA problems. After still unable to playback anything
with my multichannel sound card, I did a little research for myself
what 'plughw' device actually means. In result, I got Jokosher to
playback with custom 'alsasink device=plughw:2' string. However, it
failed to playback when I choosed ALSA and then device. I hope it's
not serious bug though. So if we fix Jokosher to playback everything
trough plughw to any device, it should work.
With recording there is kinda simple situation - recording from device
with one mono channel works and that's it. I haven't tried to record
from line in, but it should work too, after converted to mono.
However, something with more channels are showstopper.
Again, also see suggestion about playback/recording error dialogs above.
Further issues:
5. Multichannel import and recording - when doing import of mp3, I
thought, what a heck, it does convert it to mono. Sometimes it is
enough, but sometimes it would rock to have stereo file converted to
two "Audio File" instruments. Probably some pop-up dialog/warning
would be enough. Stereo recording would be more difficult and would
require the same deinterleave element as multichannel sound cards. It
is possible to have many channels in Ogg Vorbis, for example.
6. Accelerated graphics - as far as I understand, we use Cairo, but it
has to be explicitly set to use hardware acceleration backend. How we
can deal with this? Waveforms in fact are OK even now, but VU meters
sure is lagging like a hell. :)
As I wanted to post this as soon as possible, I will send another mail
with more detailed bug information, like report numbers.
Cheers,
Peteris Krisjanis.
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