While Commons tries to create a downloadable copy of file of high quality, the error comes out.
The file:
https://commons.wikimedia.org/wiki/File:Вики-Конференция_2014._День_1._Открытие_конференции.webm
See decoding to WebM 720p and WebM 1080p mistake:
'/usr/bin/avconv' -y -i '/tmp/localcopy_d254a20e4b98-1.webm' -threads 2 -skip_threshold 0 -bufsize 6000k -rc_init_occupancy 4000 -qmin '19' -qmax '19' -vcodec libvpx -f webm -s 1920x1080 -aq '3' -acodec libvorbis /tmp/transcode_1080p.webm1e1bd48be236-1.webm
Exitcode: 1
Memory: 4194304
avconv version 0.8.12-4:0.8.12-0ubuntu0.12.04.1, Copyright (c) 2000-2014 the Libav developers
built on Jun 10 2014 15:31:10 with gcc 4.6.3
[matroska,webm @ 0x1fe37a0] Unknown entry 0x56BB
[matroska,webm @ 0x1fe37a0] Unknown/unsupported CodecID A_OPUS.
[matroska,webm @ 0x1fe37a0] Estimating duration from bitrate, this may be inaccurate
Input #0, matroska,webm, from '/tmp/localcopy_d254a20e4b98-1.webm':
Duration: 00:12:24.57, start: 0.000000, bitrate: N/A
Stream #0.0: Video: vp8, yuv420p, 1920x1080, PAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr, 1k tbn, 1k tbc (default)
Stream #0.1: Audio: [0][0][0][0] / 0x0000, 48000 Hz, 2 channels (default)
[buffer @ 0x22d5820] w:1920 h:1080 pixfmt:yuv420p
Incompatible sample format '(null)' for codec 'libvorbis', auto-selecting format 's16'
[libvpx @ 0x20f4c80] v1.1.0
Output #0, webm, to '/tmp/transcode_1080p.webm1e1bd48be236-1.webm':
Stream #0.0: Video: libvpx, yuv420p, 1920x1080 [PAR 1:1 DAR 16:9], q=19-19, 200 kb/s, 90k tbn, 23.98 tbc (default)
Stream #0.1: Audio: libvorbis, 48000 Hz, 2 channels, s16 (default)
Stream mapping:
Stream #0:0 -> #0:0 (vp8 -> libvpx)
Stream #0:1 -> #0:1 (? -> libvorbis)
Decoder (codec id 0) not found for input stream #0:1
--------------------------
**Version**: wmf-deployment
**Severity**: normal
**URL**: https://commons.wikimedia.org/wiki/File:Вики-Конференция_2014._День_1._Открытие_конференции.webm