[FFmpeg-trac] #3053(avcodec:open): 2-pass wmv2 fails with "requested bitrate is too low"
FFmpeg
trac at avcodec.org
Sat Oct 19 13:55:29 CEST 2013
#3053: 2-pass wmv2 fails with "requested bitrate is too low"
------------------------------------+-----------------------------------
Reporter: terran | Owner:
Type: defect | Status: open
Priority: normal | Component: avcodec
Version: git-master | Resolution:
Keywords: wmv2 | Blocked By:
Blocking: | Reproduced by developer: 1
Analyzed by developer: 0 |
------------------------------------+-----------------------------------
Changes (by cehoyos):
* status: new => open
* version: 2.0.1 => git-master
* reproduced: 0 => 1
Comment:
A bitrate of 300kb is impossible for the given sample and encoder afaict
(so the error message is correct) but I can reproduce the issue with a
higher bitrate (that can be reached with a sufficiently high quantiser):
{{{
$ ffmpeg -i bbb.mp4 -an -qscale 90 -vcodec wmv2 out.wmv
ffmpeg version N-57252-gfec6d54 Copyright (c) 2000-2013 the FFmpeg
developers
built on Oct 19 2013 13:03:29 with gcc 4.7 (SUSE Linux)
configuration: --enable-gpl --enable-libx264
libavutil 52. 47.100 / 52. 47.100
libavcodec 55. 37.101 / 55. 37.101
libavformat 55. 19.102 / 55. 19.102
libavdevice 55. 4.100 / 55. 4.100
libavfilter 3. 88.101 / 3. 88.101
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 17.104 / 0. 17.104
libpostproc 52. 3.100 / 52. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'bbb.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf55.12.100
Duration: 00:00:15.02, start: 0.000333, bitrate: 835 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
1280x720 [SAR 1:1 DAR 16:9], 703 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc
(default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, 3.0, fltp,
127 kb/s (default)
Metadata:
handler_name : SoundHandler
Please use -q:a or -q:v, -qscale is ambiguous
Output #0, asf, to 'out.wmv':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
WM/EncodingSettings: Lavf55.19.102
Stream #0:0(und): Video: wmv2 (WMV2 / 0x32564D57), yuv420p, 1280x720
[SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 1k tbn, 24 tbc (default)
Metadata:
handler_name : VideoHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 -> wmv2)
Press [q] to stop, [?] for help
frame= 360 fps=259 q=90.0 Lsize= 1188kB time=00:00:15.00 bitrate=
649.0kbits/s
video:1170kB audio:0kB subtitle:0 global headers:0kB muxing overhead
1.524118%
}}}
{{{
$ ffmpeg -i bbb.mp4 -an -vb 1000k -pass 1 -vcodec wmv2 out.wmv
ffmpeg version N-57252-gfec6d54 Copyright (c) 2000-2013 the FFmpeg
developers
built on Oct 19 2013 13:03:29 with gcc 4.7 (SUSE Linux)
configuration: --enable-gpl --enable-libx264
libavutil 52. 47.100 / 52. 47.100
libavcodec 55. 37.101 / 55. 37.101
libavformat 55. 19.102 / 55. 19.102
libavdevice 55. 4.100 / 55. 4.100
libavfilter 3. 88.101 / 3. 88.101
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 17.104 / 0. 17.104
libpostproc 52. 3.100 / 52. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'bbb.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf55.12.100
Duration: 00:00:15.02, start: 0.000333, bitrate: 835 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
1280x720 [SAR 1:1 DAR 16:9], 703 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc
(default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, 3.0, fltp,
127 kb/s (default)
Metadata:
handler_name : SoundHandler
Output #0, asf, to 'out.wmv':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
WM/EncodingSettings: Lavf55.19.102
Stream #0:0(und): Video: wmv2 (WMV2 / 0x32564D57), yuv420p, 1280x720
[SAR 1:1 DAR 16:9], q=2-31, pass 1, 1000 kb/s, 1k tbn, 24 tbc (default)
Metadata:
handler_name : VideoHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 -> wmv2)
Press [q] to stop, [?] for help
frame= 360 fps=212 q=21.3 Lsize= 2123kB time=00:00:15.00
bitrate=1159.3kbits/s
video:2096kB audio:0kB subtitle:0 global headers:0kB muxing overhead
1.284990%
}}}
{{{
$ ffmpeg -i bbb.mp4 -an -vb 1000k -pass 2 -vcodec wmv2 -y out.wmv
ffmpeg version N-57252-gfec6d54 Copyright (c) 2000-2013 the FFmpeg
developers
built on Oct 19 2013 13:03:29 with gcc 4.7 (SUSE Linux)
configuration: --enable-gpl --enable-libx264
libavutil 52. 47.100 / 52. 47.100
libavcodec 55. 37.101 / 55. 37.101
libavformat 55. 19.102 / 55. 19.102
libavdevice 55. 4.100 / 55. 4.100
libavfilter 3. 88.101 / 3. 88.101
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 17.104 / 0. 17.104
libpostproc 52. 3.100 / 52. 3.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'bbb.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf55.12.100
Duration: 00:00:15.02, start: 0.000333, bitrate: 835 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
1280x720 [SAR 1:1 DAR 16:9], 703 kb/s, 24 fps, 24 tbr, 12288 tbn, 48 tbc
(default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, 3.0, fltp,
127 kb/s (default)
Metadata:
handler_name : SoundHandler
[wmv2 @ 0x194bee0] requested bitrate is too low
Output #0, asf, to 'out.wmv':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf55.12.100
Stream #0:0(und): Video: wmv2, yuv420p, 1280x720 [SAR 1:1 DAR 16:9],
q=2-31, pass 2, 1000 kb/s, 90k tbn, 24 tbc (default)
Metadata:
handler_name : VideoHandler
Stream mapping:
Stream #0:0 -> #0:0 (h264 -> wmv2)
Error while opening encoder for output stream #0:0 - maybe incorrect
parameters such as bit_rate, rate, width or height
}}}
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/3053#comment:4>
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