[FFmpeg-trac] #3149(avformat:new): Matroska muxer does not generate cues for audio files
FFmpeg
trac at avcodec.org
Sun Nov 17 22:18:38 CET 2013
#3149: Matroska muxer does not generate cues for audio files
-------------------------------------+-------------------------------------
Reporter: spencercw | Type: defect
Status: new | Priority: normal
Component: avformat | Version: 2.1
Keywords: matroska | Blocked By:
muxer cues | Reproduced by developer: 0
Blocking: |
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
The Matroska muxer does not generate cue entries for audio-only files,
which will create performance problems when seeking on playback,
particularly for large files. The relevant code in matroskaenc.c only
looks at video and subtitle streams:
{{{
if ((codec->codec_type == AVMEDIA_TYPE_VIDEO && keyframe) ||
codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
ret = mkv_add_cuepoint(mkv->cues, pkt->stream_index, ts,
mkv->cluster_pos, relative_packet_pos,
codec->codec_type == AVMEDIA_TYPE_SUBTITLE
? duration : -1);
if (ret < 0) return ret;
}
}}}
How to reproduce:
1. Mux any audio file to Matroska.
2. Execute `mkvinfo -v test.mka | grep -i cue`; nothing is output. This
should display `|+ Cues (subentries will be skipped)` if cues are present.
Sample command line output below:
{{{
$ ffmpeg -v 9 -loglevel 99 -i 12\ -\ Yeah.mp3 -codec copy test.mka
ffmpeg version 2.1 Copyright (c) 2000-2013 the FFmpeg developers
built on Nov 14 2013 18:11:01 with Microsoft (R) 32-bit C/C++ Optimizing
Compiler Version 16.00.40219.01 for 80x86
configuration: --toolchain=msvc --enable-shared
libavutil 52. 48.100 / 52. 48.100
libavcodec 55. 39.100 / 55. 39.100
libavformat 55. 19.104 / 55. 19.104
libavdevice 55. 5.100 / 55. 5.100
libavfilter 3. 90.100 / 3. 90.100
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 17.104 / 0. 17.104
Splitting the commandline.
Reading option '-v' ... matched as option 'v' (set logging level) with
argument '9'.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging
level) with argument '99'.
Reading option '-i' ... matched as input file with argument '12 -
Yeah.mp3'.
Reading option '-codec' ... matched as option 'codec' (codec name) with
argument 'copy'.
Reading option 'test.mka' ... matched as output file.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option v (set logging level) with argument 9.
Successfully parsed a group of options.
Parsing a group of options: input file 12 - Yeah.mp3.
Successfully parsed a group of options.
Opening an input file: 12 - Yeah.mp3.
[mp3 @ 038BBD20] Format mp3 probed with size=8192 and score=51
[mp3 @ 038BBD20] id3v2 ver:4 flags:00 len:1095
[mp3 @ 038BBD20] File position before avformat_find_stream_info() is 1105
[mp3 @ 038BBD20] Estimating duration from bitrate, this may be inaccurate
[mp3 @ 038BBD20] File position after avformat_find_stream_info() is 164527
Input #0, mp3, from '12 - Yeah.mp3':
Metadata:
artist : Queen
album : Made in Heaven
date : 1995
genre : Rock
title : Yeah
track : 12
Duration: 00:00:04.11, start: 0.000000, bitrate: 320 kb/s
Stream #0:0, 157, 1/14112000: Audio: mp3, 44100 Hz, stereo, s16p, 320
kb/s
Successfully opened the file.
Parsing a group of options: output file test.mka.
Applying option codec (codec name) with argument copy.
Successfully parsed a group of options.
Opening an output file: test.mka.
Successfully opened the file.
Output #0, matroska, to 'test.mka':
Metadata:
artist : Queen
album : Made in Heaven
date : 1995
genre : Rock
title : Yeah
PART_NUMBER : 12
encoder : Lavf55.19.104
Stream #0:0, 0, 1/1000: Audio: mp3 (U[0][0][0] / 0x0055), 44100 Hz,
stereo, 320 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[matroska @ 0390FCE0] Writing block at offset 667, size 1044, pts 0, dts
0, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 1718, size 1045, pts 26, dts
26, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 2770, size 1045, pts 52, dts
52, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 3822, size 1045, pts 78, dts
78, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 4874, size 1045, pts 104,
dts 104, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 5926, size 1045, pts 131,
dts 131, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 6978, size 1045, pts 157,
dts 157, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 8030, size 1045, pts 183,
dts 183, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 9082, size 1045, pts 209,
dts 209, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 10134, size 1045, pts 235,
dts 235, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 11186, size 1044, pts 261,
dts 261, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 12237, size 1045, pts 287,
dts 287, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 13289, size 1045, pts 313,
dts 313, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 14341, size 1045, pts 340,
dts 340, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 15393, size 1045, pts 366,
dts 366, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 16445, size 1045, pts 392,
dts 392, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 17497, size 1045, pts 418,
dts 418, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 18549, size 1045, pts 444,
dts 444, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 19601, size 1045, pts 470,
dts 470, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 20653, size 1045, pts 496,
dts 496, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 21705, size 1044, pts 522,
dts 522, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 22756, size 1045, pts 549,
dts 549, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 23808, size 1045, pts 575,
dts 575, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 24860, size 1045, pts 601,
dts 601, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 25912, size 1045, pts 627,
dts 627, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 26964, size 1045, pts 653,
dts 653, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 28016, size 1045, pts 679,
dts 679, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 29068, size 1045, pts 705,
dts 705, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 30120, size 1045, pts 731,
dts 731, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 31172, size 1045, pts 758,
dts 758, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 32224, size 1044, pts 784,
dts 784, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 33275, size 1045, pts 810,
dts 810, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 34327, size 1045, pts 836,
dts 836, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 35379, size 1045, pts 862,
dts 862, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 36431, size 1045, pts 888,
dts 888, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 37483, size 1045, pts 914,
dts 914, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 38535, size 1045, pts 940,
dts 940, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 39587, size 1045, pts 967,
dts 967, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 40639, size 1045, pts 993,
dts 993, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 41691, size 1045, pts 1019,
dts 1019, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 42743, size 1044, pts 1045,
dts 1045, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 43794, size 1045, pts 1071,
dts 1071, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 44846, size 1045, pts 1097,
dts 1097, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 45898, size 1045, pts 1123,
dts 1123, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 46950, size 1045, pts 1149,
dts 1149, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 48002, size 1045, pts 1176,
dts 1176, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 49054, size 1045, pts 1202,
dts 1202, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 50106, size 1045, pts 1228,
dts 1228, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 51158, size 1045, pts 1254,
dts 1254, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 52210, size 1044, pts 1280,
dts 1280, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 53261, size 1045, pts 1306,
dts 1306, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 54313, size 1045, pts 1332,
dts 1332, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 55365, size 1045, pts 1358,
dts 1358, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 56417, size 1045, pts 1384,
dts 1384, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 57469, size 1045, pts 1411,
dts 1411, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 58521, size 1045, pts 1437,
dts 1437, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 59573, size 1045, pts 1463,
dts 1463, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 60625, size 1045, pts 1489,
dts 1489, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 61677, size 1045, pts 1515,
dts 1515, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 62729, size 1044, pts 1541,
dts 1541, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 63780, size 1045, pts 1567,
dts 1567, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 64832, size 1045, pts 1593,
dts 1593, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 65884, size 1045, pts 1620,
dts 1620, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 66936, size 1045, pts 1646,
dts 1646, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 67988, size 1045, pts 1672,
dts 1672, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 69040, size 1045, pts 1698,
dts 1698, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 70092, size 1045, pts 1724,
dts 1724, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 71144, size 1045, pts 1750,
dts 1750, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 72196, size 1045, pts 1776,
dts 1776, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 73248, size 1044, pts 1802,
dts 1802, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 74299, size 1045, pts 1829,
dts 1829, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 75351, size 1045, pts 1855,
dts 1855, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 76403, size 1045, pts 1881,
dts 1881, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 77455, size 1045, pts 1907,
dts 1907, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 78507, size 1045, pts 1933,
dts 1933, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 79559, size 1045, pts 1959,
dts 1959, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 80611, size 1045, pts 1985,
dts 1985, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 81663, size 1045, pts 2011,
dts 2011, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 82715, size 1045, pts 2038,
dts 2038, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 83767, size 1044, pts 2064,
dts 2064, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 84818, size 1045, pts 2090,
dts 2090, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 85870, size 1045, pts 2116,
dts 2116, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 86922, size 1045, pts 2142,
dts 2142, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 87974, size 1045, pts 2168,
dts 2168, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 89026, size 1045, pts 2194,
dts 2194, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 90078, size 1045, pts 2220,
dts 2220, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 91130, size 1045, pts 2247,
dts 2247, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 92182, size 1045, pts 2273,
dts 2273, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 93234, size 1045, pts 2299,
dts 2299, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 94286, size 1044, pts 2325,
dts 2325, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 95337, size 1045, pts 2351,
dts 2351, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 96389, size 1045, pts 2377,
dts 2377, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 97441, size 1045, pts 2403,
dts 2403, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 98493, size 1045, pts 2429,
dts 2429, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 99545, size 1045, pts 2456,
dts 2456, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 100597, size 1045, pts 2482,
dts 2482, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 101649, size 1045, pts 2508,
dts 2508, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 102701, size 1045, pts 2534,
dts 2534, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 103753, size 1044, pts 2560,
dts 2560, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 104804, size 1045, pts 2586,
dts 2586, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 105856, size 1045, pts 2612,
dts 2612, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 106908, size 1045, pts 2638,
dts 2638, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 107960, size 1045, pts 2664,
dts 2664, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 109012, size 1045, pts 2691,
dts 2691, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 110064, size 1045, pts 2717,
dts 2717, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 111116, size 1045, pts 2743,
dts 2743, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 112168, size 1045, pts 2769,
dts 2769, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 113220, size 1045, pts 2795,
dts 2795, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 114272, size 1044, pts 2821,
dts 2821, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 115323, size 1045, pts 2847,
dts 2847, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 116375, size 1045, pts 2873,
dts 2873, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 117427, size 1045, pts 2900,
dts 2900, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 118479, size 1045, pts 2926,
dts 2926, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 119531, size 1045, pts 2952,
dts 2952, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 120583, size 1045, pts 2978,
dts 2978, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 121635, size 1045, pts 3004,
dts 3004, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 122687, size 1045, pts 3030,
dts 3030, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 123739, size 1045, pts 3056,
dts 3056, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 124791, size 1044, pts 3082,
dts 3082, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 125842, size 1045, pts 3109,
dts 3109, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 126894, size 1045, pts 3135,
dts 3135, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 127946, size 1045, pts 3161,
dts 3161, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 128998, size 1045, pts 3187,
dts 3187, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 130050, size 1045, pts 3213,
dts 3213, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 131102, size 1045, pts 3239,
dts 3239, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 132154, size 1045, pts 3265,
dts 3265, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 133206, size 1045, pts 3291,
dts 3291, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 134258, size 1045, pts 3318,
dts 3318, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 135310, size 1044, pts 3344,
dts 3344, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 136361, size 1045, pts 3370,
dts 3370, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 137413, size 1045, pts 3396,
dts 3396, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 138465, size 1045, pts 3422,
dts 3422, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 139517, size 1045, pts 3448,
dts 3448, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 140569, size 1045, pts 3474,
dts 3474, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 141621, size 1045, pts 3500,
dts 3500, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 142673, size 1045, pts 3527,
dts 3527, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 143725, size 1045, pts 3553,
dts 3553, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 144777, size 1045, pts 3579,
dts 3579, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 145829, size 1044, pts 3605,
dts 3605, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 146880, size 1045, pts 3631,
dts 3631, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 147932, size 1045, pts 3657,
dts 3657, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 148984, size 1045, pts 3683,
dts 3683, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 150036, size 1045, pts 3709,
dts 3709, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 151088, size 1045, pts 3736,
dts 3736, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 152140, size 1045, pts 3762,
dts 3762, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 153192, size 1045, pts 3788,
dts 3788, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 154244, size 1045, pts 3814,
dts 3814, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 155296, size 1044, pts 3840,
dts 3840, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 156347, size 1045, pts 3866,
dts 3866, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 157399, size 1045, pts 3892,
dts 3892, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 158451, size 1045, pts 3918,
dts 3918, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 159503, size 1045, pts 3944,
dts 3944, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 160555, size 1045, pts 3971,
dts 3971, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 161607, size 1045, pts 3997,
dts 3997, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 162659, size 1045, pts 4023,
dts 4023, duration 26, flags 128
[matroska @ 0390FCE0] Writing block at offset 163711, size 1045, pts 4049,
dts 4049, duration 26, flags 128
No more output streams to write to, finishing.
[matroska @ 0390FCE0] Writing block at offset 164763, size 290, pts 4075,
dts 4075, duration 26, flags 128
[matroska @ 0390FCE0] end duration = 4101
size= 161kB time=00:00:04.10 bitrate= 322.0kbits/s
video:0kB audio:159kB subtitle:0 global headers:0kB muxing overhead
1.081485%
0 frames successfully decoded, 0 decoding errors
[AVIOContext @ 038C4780] Statistics: 16 seeks, 169 writeouts
[AVIOContext @ 038C42E0] Statistics: 164527 bytes read, 0 seeks
}}}
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/3149>
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