View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0006345 | ardour | bugs | public | 2015-05-24 18:42 | 2015-12-08 14:49 |
| Reporter | chaot | Assigned To | |||
| Priority | normal | Severity | major | Reproducibility | always |
| Status | closed | Resolution | no change required | ||
| Product Version | 4.0 | ||||
| Summary | 0006345: Exported ogg files are flawed (also affects flac) | ||||
| Description | Version: Ardour 4.0 from ardour.org Description: The exported ogg files are cut at the end (approximately the last second is missing) and sndfile-info gives strange results which hints at the ogg files being partly broken. The length of the part that is missing at the end of the ogg files varies. Steps to reproduce: * Create new session in Ardour4 * Add audio track * Record a minute of audio to the track (the effect tended to be stronger on longer recordings in my test) * Session > Export > Export to Audio File(s) * Choose: - Format: Ogg/Vorbis (tagged): normalize, Ogg Vorbis, Session rate - leave the rest as is * Execute: sndfile-info on the created ogg soundfile. * This should especially give weird values for 'Signal Max' (around -90dB) -> probably ogg file is broken * Listen to the ogg file with mplayer (or some other player that doesn't cut audio at the end as a bug). -> A little piece of the end is missing, normally approximately a second. -> It's especially hearable when one trimmed the silence at the end of the recording. Misc: * Used JACK sample rate: 48k * I also tried sndfile-convert to check if it's a libsndfile bug but it worked flawlessly on a flawless wav file. * Exporting to flac has a similar issue with cutting at the end but sndfile-info seems to print the correct data. * For an example ogg file that is flawed see/hear the attached one. | ||||
| Tags | No tags attached. | ||||
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2015-05-24 18:42
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This is the output of sndfile-info on the example file: Version : libsndfile-1.0.25 ======================================== File : short_part_after_d_regions3.ogg Length : 58620 Ogg stream data : Vorbis Stream serialno : 0422077804 Vorbis library version : Xiph.Org libVorbis 1.3.2 Bitstream is 2 channel, 48000 Hz Encoded by : Xiph.Org libVorbis I 20140122 (Turpakäräjiin) End ---------------------------------------- Sample Rate : 48000 Frames : 253440 Channels : 2 Format : 0x00200060 Sections : 1 Seekable : TRUE Duration : 00:00:05.280 Signal Max : 0.957727 (-90.68 dB) |
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I experience this behaviour on two machines. They run: * Linux Mint 17, 64 bit * Xubuntu 14.10, 64 bit |
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I can reproduce the -90dB issue on GNU/Linux 32bit. Both with nightly built (libsndfile 20140122) as well as a build from source (debian libsndfile 20101101) using the ALSA backend and JACK backend. I did (two times) 4 Ogg/Vorbis exports, normalize on/off tagged on/off. all at session-rate. The sndfile-info duration varies ever so slightly 00:02:53.793 -> 00:02:54.642 and all files are silent (around -92dB or so, slightly different every export). The odd thing: on OSX it works just fine (both self-built as well as nightly). duration is always exactly what it should be and the file plays fine. |
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First step of further investigation: the temporary file created before normalization and ogg-encoding is fine. (while ardour is normalizing cp <Session-Dir>/export/XXXXXX /tmp/ check file with sox -t raw -r 48k -e float -b 32 -c 2 /tmp/6GL5YX /tmp/test.wav) perfectly bit exact every time). |
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mmh actually this seems to be an issue with libsndfile/libogg/libvorbis on some platforms. sndfile-convert -vorbis session.wav session.oga has the same issue. |
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scratch all the above. It's only sndfile-info reporting it incorrectly! (using float while the ogg file is actually 16bit). sndfile-convert works too. All exports here so far actually play fine (with mplayer) using the Dummy or ALSA backend to export, all files are precisely the expected duration. |
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Now having switched to Arch Linux on both my machines this issue doesn't occur anymore. Most probably this bug was related to some old jack version shipped with Ubuntu. Thanks for your help Robin and sorry for having wasted your time with this issue. |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2015-05-24 18:42 | chaot | New Issue | |
| 2015-05-24 18:42 | chaot | File Added: short_part_after_d_regions3.ogg | |
| 2015-05-24 18:44 | chaot | Note Added: 0016724 | |
| 2015-05-24 18:51 | chaot | Note Added: 0016725 | |
| 2015-05-26 11:44 | x42 | Note Added: 0016729 | |
| 2015-05-26 12:07 | x42 | Note Added: 0016730 | |
| 2015-05-26 13:35 | x42 | Note Added: 0016731 | |
| 2015-05-26 13:51 | x42 | Note Added: 0016732 | |
| 2015-12-08 14:49 | chaot | Note Added: 0017717 | |
| 2015-12-08 14:49 | chaot | Status | new => closed |
| 2015-12-08 14:49 | chaot | Resolution | open => no change required |
