audb.info.duration() can fail for large databases about audb

[frankenjoe]

Currently we store 0.0 for non-media files and media files that are not WAV or FLAC. And that value also goes into the DataFrame. But when we request the duration with deps.duration(file), we return None for those files:

https://github.com/audeering/audb/blob/master/audb/core/dependencies.py#L273

So apparentely some media files of audioset have a duration of 0.0 (is this expected?), which then causes the problem you describe.

The fix you suggest #25 avoids calling Dependencies.duration() and therefore the error does not occur. The question is if we should stay with the current implementation of Dependencies.duration() of if it is safer to return 0.0 instead of None?

[frankenjoe]

Here's a list of files for which duration is 0.0:

audioset/eval_segments/1eHDeRxypFE_120.000.wav
audioset/unbalanced_train_segments/-dG6nL9hxCI_30.000.wav
audioset/unbalanced_train_segments/0vcR8EJPkNg_30.000.wav
audioset/unbalanced_train_segments/1Xhai0AqqYc_30.000.wav
audioset/unbalanced_train_segments/1YLFyYYjOBo_350.000.wav
audioset/unbalanced_train_segments/1eOwK_vnSNs_530.000.wav
audioset/unbalanced_train_segments/1zTnrk9WbWw_22.000.wav
audioset/unbalanced_train_segments/3UpqEQK8L2g_420.000.wav
audioset/unbalanced_train_segments/3Uuz8uckuZI_150.000.wav
audioset/unbalanced_train_segments/3Uz50faafeQ_110.000.wav
audioset/unbalanced_train_segments/3Vfu_ZGAIj0_490.000.wav
audioset/unbalanced_train_segments/3W-qiMM0qb4_320.000.wav
audioset/unbalanced_train_segments/3WDtoYwcNQU_210.000.wav
audioset/unbalanced_train_segments/3XfKg7nY8qU_590.000.wav
audioset/unbalanced_train_segments/3sSblRfEG2o_20.000.wav
audioset/unbalanced_train_segments/3zMB6xg7ouA_540.000.wav
audioset/unbalanced_train_segments/4rubpXyUYWo_520.000.wav
audioset/unbalanced_train_segments/5K6G403jyqE_30.000.wav
audioset/unbalanced_train_segments/5SVRRZZLpLQ_270.000.wav
audioset/unbalanced_train_segments/5jhswDK5HY8_190.000.wav
audioset/unbalanced_train_segments/5vqWfePO8r0_60.000.wav
audioset/unbalanced_train_segments/6-B1MeRJ0fM_30.000.wav
audioset/unbalanced_train_segments/6bQ5bFruUSU_470.000.wav
audioset/unbalanced_train_segments/7XfsRZmrPTk_380.000.wav
audioset/unbalanced_train_segments/8MXI-oFA1wk_30.000.wav
audioset/unbalanced_train_segments/8Slj7B_LDfQ_30.000.wav
audioset/unbalanced_train_segments/9_AdiGNxqk0_30.000.wav
audioset/unbalanced_train_segments/9wsqa5iuvUk_580.000.wav
audioset/unbalanced_train_segments/BTxswE3Ktho_140.000.wav
audioset/unbalanced_train_segments/BaM_Lb-anUM_30.000.wav
audioset/unbalanced_train_segments/BjLqOn28WM8_540.000.wav
audioset/unbalanced_train_segments/CmgWyoNh_LU_30.000.wav
audioset/unbalanced_train_segments/DUtaiHX5acw_100.000.wav
audioset/unbalanced_train_segments/Dm1ZmRNHNsU_30.000.wav
audioset/unbalanced_train_segments/ER9r34AjR6s_500.000.wav
audioset/unbalanced_train_segments/Fli8wjBFV2M_230.000.wav
audioset/unbalanced_train_segments/FnYkF2oI_f0_530.000.wav
audioset/unbalanced_train_segments/HUfTrnZ-RSk_30.000.wav
audioset/unbalanced_train_segments/HkWYbsFGDsY_470.000.wav
audioset/unbalanced_train_segments/IZjp4g5t_vo_170.000.wav
audioset/unbalanced_train_segments/JTDe2G1VAx4_110.000.wav
audioset/unbalanced_train_segments/K-TjW8HcSU4_370.000.wav
audioset/unbalanced_train_segments/LAnLq0qql2o_180.000.wav
audioset/unbalanced_train_segments/LhsnmpK0xkQ_490.000.wav
audioset/unbalanced_train_segments/MOV1oBlyYpU_160.000.wav
audioset/unbalanced_train_segments/OHJDtmjrCYM_250.000.wav
audioset/unbalanced_train_segments/PAHEldIA5Yk_270.000.wav
audioset/unbalanced_train_segments/QaBgMk4ccos_210.000.wav
audioset/unbalanced_train_segments/Qb04wAv0c_4_270.000.wav
audioset/unbalanced_train_segments/QcGpyXhIENI_80.000.wav
audioset/unbalanced_train_segments/QfILH7zmFxk_290.000.wav
audioset/unbalanced_train_segments/RFzGhgLcpv0_50.000.wav
audioset/unbalanced_train_segments/TV2NtVguqeE_180.000.wav
audioset/unbalanced_train_segments/WNtE9AvBOKg_560.000.wav
audioset/unbalanced_train_segments/WtFGPDqfOgE_560.000.wav
audioset/unbalanced_train_segments/XQoLtCFZG-c_160.000.wav
audioset/unbalanced_train_segments/YlwxbqtJST4_13.000.wav
audioset/unbalanced_train_segments/_vrj7xAGCUM_30.000.wav
audioset/unbalanced_train_segments/aEVbRV_c9bk_24.000.wav
audioset/unbalanced_train_segments/aPvNMALHyaI_290.000.wav
audioset/unbalanced_train_segments/b4TNdsnx6B8_30.000.wav
audioset/unbalanced_train_segments/bj0u9F6DEhc_250.000.wav
audioset/unbalanced_train_segments/bjLiWLXtXK4_27.000.wav
audioset/unbalanced_train_segments/cnzMmXjihdQ_10.000.wav
audioset/unbalanced_train_segments/eqnveHA0hrI_200.000.wav
audioset/unbalanced_train_segments/fVZVIZc2pAM_200.000.wav
audioset/unbalanced_train_segments/gT-IsJN7uis_460.000.wav
audioset/unbalanced_train_segments/gVEix6vNL7k_120.000.wav
audioset/unbalanced_train_segments/gp-5bdPzSDc_350.000.wav
audioset/unbalanced_train_segments/h3XDhqBwU1A_150.000.wav
audioset/unbalanced_train_segments/hZ0_tspxeX0_390.000.wav
audioset/unbalanced_train_segments/iYWzoGSLYPg_380.000.wav
audioset/unbalanced_train_segments/ileDehaisZE_520.000.wav
audioset/unbalanced_train_segments/izFhj77r7Uc_480.000.wav
audioset/unbalanced_train_segments/jt4Z46pknFo_60.000.wav
audioset/unbalanced_train_segments/lGhZqXf8zw0_240.000.wav
audioset/unbalanced_train_segments/lrv96Tkaifc_50.000.wav
audioset/unbalanced_train_segments/mDPXk7MF6YE_170.000.wav
audioset/unbalanced_train_segments/oAl41EK2Kd0_440.000.wav
audioset/unbalanced_train_segments/r2PcA0hjBZk_30.000.wav
audioset/unbalanced_train_segments/s8s2tnpTD4s_390.000.wav
audioset/unbalanced_train_segments/s9GfRQr3OAk_60.000.wav
audioset/unbalanced_train_segments/tKRkWDLfzZg_80.000.wav
audioset/unbalanced_train_segments/tpYfNeSrVu0_310.000.wav
audioset/unbalanced_train_segments/wM5Qf5xXT8w_410.000.wav
audioset/unbalanced_train_segments/y8Vmi3tHgaw_50.000.wav
audioset/unbalanced_train_segments/yYJZk8LMCxk_310.000.wav

[hagenw]

Good point, I also think that audb.Dependencies.duration() should never return None. The same holds for sampling_rate(), bit_depth() and channels(). I opened #27 to address this.

Regarding the empty audioset files, I created an issue.

[hagenw]

Fixed by #27