[FFmpeg-trac] #1408(undetermined:new): Encoding to mp3 produces a file with audio and video by default
FFmpeg
trac at avcodec.org
Mon Jun 4 10:37:48 CEST 2012
#1408: Encoding to mp3 produces a file with audio and video by default
-------------------------------------+-------------------------------------
Reporter: cehoyos | Owner:
Type: defect | Status: new
Priority: important | Component:
Version: git- | undetermined
master | Keywords: mp3
Blocked By: | regression
Reproduced by developer: 0 | Blocking:
| Analyzed by developer: 0
-------------------------------------+-------------------------------------
http://thread.gmane.org/gmane.comp.video.ffmpeg.user/37424
Since 2dfea12, FFmpeg by default creates a video (png) stream when
encoding mp3, this causes a severe performance regression because video
has to be decoded.
{{{
$ ffmpeg -i fate-suite/svq3/Vertical400kbit.sorenson3.mov out.mp3
ffmpeg version N-41284-ge00b2d2 Copyright (c) 2000-2012 the FFmpeg
developers
built on Jun 4 2012 08:52:52 with gcc 4.3.2
configuration: --cc=/usr/local/gcc-4.3.2/bin/gcc --enable-gpl --enable-
libopenjpeg --enable-libvorbis --enable-libspeex --enable-libmp3lame
--enable-libtheora --extra-ldflags=-lm --enable-libvpx --enable-libxavs
libavutil 51. 56.100 / 51. 56.100
libavcodec 54. 23.100 / 54. 23.100
libavformat 54. 6.101 / 54. 6.101
libavdevice 54. 0.100 / 54. 0.100
libavfilter 2. 78.100 / 2. 78.100
libswscale 2. 1.100 / 2. 1.100
libswresample 0. 15.100 / 0. 15.100
libpostproc 52. 0.100 / 52. 0.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x90123c0] max_analyze_duration 5000000 reached
at 5000998
Guessed Channel Layout for Input Stream #0.1 : mono
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'fate-
suite/svq3/Vertical400kbit.sorenson3.mov':
Metadata:
creation_time : 2001-03-20 16:17:18
title : Vertical Online SV3 Demo
title-eng : Vertical Online SV3 Demo
artist : Logan Kelsey
artist-eng : Logan Kelsey
copyright : © Vertical Online 2001
copyright-eng : © Vertical Online 2001
encoder : Sorenson Video 3
encoder-eng : Sorenson Video 3
Duration: 00:00:43.57, start: 0.000000, bitrate: 580 kb/s
Stream #0:0(eng): Video: svq3 (SVQ3 / 0x33515653), yuvj420p, 320x240,
391 kb/s, 30.02 fps, 30 tbr, 600 tbn, 600 tbc
Metadata:
creation_time : 2001-03-20 16:17:18
handler_name : Apple Alias Data Handler
Stream #0:1(eng): Audio: adpcm_ima_qt (ima4 / 0x34616D69), 44100 Hz,
mono, s16, 176 kb/s
Metadata:
creation_time : 2001-03-20 16:17:18
handler_name : Apple Alias Data Handler
[buffer @ 0x900fa20] w:320 h:240 pixfmt:yuvj420p tb:1/600 sar:0/1
sws_param:flags=2
[ffmpeg_buffersink @ 0x900f8e0] No opaque field provided
[format @ 0x900f9e0] auto-inserting filter 'auto-inserted scaler 0'
between the filter 'Parsed_null_0' and the filter 'format'
[auto-inserted scaler 0 @ 0x9012280] w:320 h:240 fmt:yuvj420p sar:0/1 ->
w:320 h:240 fmt:rgb24 sar:0/1 flags:0x4
Output #0, mp3, to 'out.mp3':
Metadata:
TDEN : 2001-03-20 16:17:18
TIT2 : Vertical Online SV3 Demo
title-eng : Vertical Online SV3 Demo
TPE1 : Logan Kelsey
artist-eng : Logan Kelsey
TCOP : © Vertical Online 2001
copyright-eng : © Vertical Online 2001
encoder-eng : Sorenson Video 3
TSSE : Lavf54.6.101
Stream #0:0(eng): Video: png, rgb24, 320x240, q=2-31, 200 kb/s, 90k
tbn, 30 tbc
Metadata:
creation_time : 2001-03-20 16:17:18
handler_name : Apple Alias Data Handler
Stream #0:1(eng): Audio: mp3, 44100 Hz, mono, s16
Metadata:
creation_time : 2001-03-20 16:17:18
handler_name : Apple Alias Data Handler
Stream mapping:
Stream #0:0 -> #0:0 (svq3 -> png)
Stream #0:1 -> #0:1 (adpcm_ima_qt -> libmp3lame)
Press [q] to stop, [?] for help
Multiple frames in a packet from stream 1
[mp3 @ 0x9018fa0] Got more than one picture in stream 0, ignoring.
frame= 1308 fps= 49 q=0.0 Lsize= 341kB time=00:00:43.57 bitrate=
64.2kbits/s
video:86771kB audio:341kB global headers:0kB muxing overhead -99.608084%
[libmp3lame @ 0x9011780] 1 frames left in que on closing
}}}
--
Ticket URL: <https://ffmpeg.org/trac/ffmpeg/ticket/1408>
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