Opened 10 years ago
Last modified 10 years ago
#4230 open defect
ASF: Big Muxing Overhead
| Reported by: | Đonny | Owned by: | |
|---|---|---|---|
| Priority: | normal | Component: | avformat |
| Version: | git-master | Keywords: | asf |
| Cc: | Blocked By: | ||
| Blocking: | Reproduced by developer: | yes | |
| Analyzed by developer: | no |
Description
Summary of the bug:
I'm doing lossless trimming of WMA (audio only; ASF) files and I have the issue that the overall bitrate of the file is growing. I managed to narrow the problem to following issue: If I just pass ASF file through FFMpeg using copy codec the file size grows.
How to reproduce:
Take the attached input file and encode it using following command
ffmpeg -i original.wma -c copy -y o2.asf
ffmpeg version N-68881-ga79ac73 Copyright (c) 2000-2015 the FFmpeg developers
built on Jan 5 2015 22:14:33 with gcc 4.9.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --e
nable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-li
bass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfreetype --enable-li
bgme --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-lib
opencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-l
ibrtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --en
able-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc --enable
-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-
libx265 --enable-libxavs --enable-libxvid --enable-lzma --enable-decklink --enable-zlib
libavutil 54. 16.100 / 54. 16.100
libavcodec 56. 19.100 / 56. 19.100
libavformat 56. 18.100 / 56. 18.100
libavdevice 56. 3.100 / 56. 3.100
libavfilter 5. 6.100 / 5. 6.100
libswscale 3. 1.101 / 3. 1.101
libswresample 1. 1.100 / 1. 1.100
libpostproc 53. 3.100 / 53. 3.100
Guessed Channel Layout for Input Stream #0.0 : stereo
Input #0, asf, from 'original.wma':
Metadata:
WMFSDKNeeded : 0.0.0.0000
DeviceConformanceTemplate: L1
WM/WMADRCPeakReference: 32767
WM/WMADRCAverageReference: 11007
PeakValue : 32673
AverageLevel : 8571
WM/Lyrics : (Hej, hej) šuti
: samo šuti
: ┼áuti moj dje─Źa─Źe plavi
:
: (Hej hej)
:
: Ako te sretnem samo šuti, samo šuti
: ┼áuti moj dje─Źa─Źe plavi
: I nek tvoja kosa plava
: Na jastuku uspomena spava
:
: Ako te sretnem samo šuti, samo šuti
: ┼áuti moj dje─Źa─Źe plavi
: I nek tvoja kosa plava
: Na jastuku uspomena spava
:
: Iako davno su nestale veze
: Što spajale su nas
: Iako davno izbrisane su rije─Źi
: I ne pamtim ti glas
:
: Iako davno ve─ç zaborav te skrio
: I dodir tvoj je stran
: Susreti novi probudi u meni onaj stari plan
:
: Ako te sretnem samo šuti, samo šuti
: ┼áuti moj dje─Źa─Źe plavi
: I nek tvoja kosa plava
: Na jastuku uspomena spava
: Šuti, samo šuti
: ┼áuti moj dje─Źa─Źe plavi
: I nek tvoja kosa plava
: Na jastuku uspomena spava
:
: (hej, hej)
:
: Dugo ve─ç dugo
: Pamtim te samo kao ─Ĺa─Źki grijeh
: Dugo ve─ç dugo
: Ne znam dal' su dra┼że bile suze il' smijeh (oho)
: Dugo ve─ç dugo zaborav te skriva
: I dodir tvoj je stran
: Susreti novi probudi u meni onaj stari plan
:
: Ako te sretnem samo šuti, samo šuti
: [03:04]┼áuti moj dje─Źa─Źe plavi
: I nek tvoja kosa plava
: Na jastuku uspomena spava
: Šuti, samo šuti
: ┼áuti moj dje─Źa─Źe plavi
: I nek tvoja kosa plava
: Na jastuku uspomena spava
: Šuti, samo šuti
: ┼áuti moj dje─Źa─Źe plavi
: I nek tvoja kosa plava
: Na jastuku uspomena spava
:
: Šuti, šuti, samo šuti
: ┼áuti moj dje─Źa─Źe plavi
:
: (┼íuti moj dje─Źa─Źe plavi)
:
title : ┼áuti moj dje─Źa─Źe plavi
album : Malo Pomalo
WMFSDKVersion : 9.00.00.3250
IsVBR : 0
WM/Year : 1994
WM/EncodingTime : 18446744072371848576
WM/UniqueFileIdentifier: ;
composer : Karma
publisher : Groove Attack
genre : Electronica & Dance
album_artist : Karma
WM/Provider : User Feedback
WM/SharedUserRating: 99
track : 13
artist : Karma
Duration: 00:04:34.76, start: 0.000000, bitrate: 97 kb/s
Stream #0:0(cze): Audio: wmav2 (a[1][0][0] / 0x0161), 44100 Hz, 2 channels, fltp, 96 k
b/s
Output #0, asf, to 'o2.asf':
Metadata:
WMFSDKNeeded : 0.0.0.0000
DeviceConformanceTemplate: L1
WM/WMADRCPeakReference: 32767
WM/WMADRCAverageReference: 11007
PeakValue : 32673
AverageLevel : 8571
WM/Lyrics : (Hej, hej) šuti
: samo šuti
: ┼áuti moj dje─Źa─Źe plavi
:
: (Hej hej)
:
: Ako te sretnem samo šuti, samo šuti
: ┼áuti moj dje─Źa─Źe plavi
: I nek tvoja kosa plava
: Na jastuku uspomena spava
:
: Ako te sretnem samo šuti, samo šuti
: ┼áuti moj dje─Źa─Źe plavi
: I nek tvoja kosa plava
: Na jastuku uspomena spava
:
: Iako davno su nestale veze
: Što spajale su nas
: Iako davno izbrisane su rije─Źi
: I ne pamtim ti glas
:
: Iako davno ve─ç zaborav te skrio
: I dodir tvoj je stran
: Susreti novi probudi u meni onaj stari plan
:
: Ako te sretnem samo šuti, samo šuti
: ┼áuti moj dje─Źa─Źe plavi
: I nek tvoja kosa plava
: Na jastuku uspomena spava
: Šuti, samo šuti
: ┼áuti moj dje─Źa─Źe plavi
: I nek tvoja kosa plava
: Na jastuku uspomena spava
:
: (hej, hej)
:
: Dugo ve─ç dugo
: Pamtim te samo kao ─Ĺa─Źki grijeh
: Dugo ve─ç dugo
: Ne znam dal' su dra┼że bile suze il' smijeh (oho)
: Dugo ve─ç dugo zaborav te skriva
: I dodir tvoj je stran
: Susreti novi probudi u meni onaj stari plan
:
: Ako te sretnem samo šuti, samo šuti
: [03:04]┼áuti moj dje─Źa─Źe plavi
: I nek tvoja kosa plava
: Na jastuku uspomena spava
: Šuti, samo šuti
: ┼áuti moj dje─Źa─Źe plavi
: I nek tvoja kosa plava
: Na jastuku uspomena spava
: Šuti, samo šuti
: ┼áuti moj dje─Źa─Źe plavi
: I nek tvoja kosa plava
: Na jastuku uspomena spava
:
: Šuti, šuti, samo šuti
: ┼áuti moj dje─Źa─Źe plavi
:
: (┼íuti moj dje─Źa─Źe plavi)
:
title : ┼áuti moj dje─Źa─Źe plavi
WM/AlbumTitle : Malo Pomalo
WMFSDKVersion : 9.00.00.3250
IsVBR : 0
WM/Year : 1994
WM/EncodingTime : 18446744072371848576
WM/UniqueFileIdentifier: ;
WM/Composer : Karma
WM/Language : hr
WM/Publisher : Groove Attack
WM/Genre : Electronica & Dance
WM/AlbumArtist : Karma
WM/Provider : User Feedback
WM/SharedUserRating: 99
WM/TrackNumber : 13
Author : Karma
WM/EncodingSettings: Lavf56.18.100
Stream #0:0(cze): Audio: wmav2 (a[1][0][0] / 0x0161), 44100 Hz, stereo, 96 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
size= 4648kB time=00:04:34.73 bitrate= 138.6kbits/s
video:0kB audio:3235kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead:
43.663895%
You see the huge muxing overhead.
The comparison of the original and outout file is
Original file Size: 3 343 892 B Audio bitrate: 96kb/s Overall bitrate: 97kb/s Overhead: 1% Copied file Size: 4 759 638 B (42% growth) Audio bitrate: 96kb/s Overall bitrate: 138kb/s Overhead: 43%
When I compare the files binary I see several blocks of 0 bytes in the transcoded file.
I guess this is issue how the ASF file is generated, that the 0 blocks should nopt be there, thus lowering the overhead.
Change History (2)
comment:1 by , 10 years ago
comment:2 by , 10 years ago
| Component: | undetermined → avformat |
|---|---|
| Keywords: | asf added; ASF WMA copy lossless removed |
| Reproduced by developer: | set |
| Status: | new → open |
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The original file can be downloaded from http://dzonny.cz/misc/temp/original.wma (to big to attach directly)