[FFmpeg-user] Better way to merge audio and video? (ffmpeg1.2.1)

Tue Jul 23 00:00:16 CEST 2013

----- Original Message ----- 
From: "John Crossman" <johncrossman at berkeley.edu>
To: "FFmpeg user questions" <ffmpeg-user at ffmpeg.org>
Sent: Monday, July 22, 2013 11:49 PM
Subject: Re: [FFmpeg-user] Better way to merge audio and video? 
(ffmpeg1.2.1)

> On Mon, Jul 22, 2013 at 2:38 PM, Lou <lou at lrcd.com> wrote:
>
>> > Is the following the best I can do? My current wait for process to 
>> > finish
>> > seems too long.
>>
>> What are you trying to do?
>>
>
> Merge the audio and video into a single video track (i.e., output.mp4)

But you are re-encoding the whole shebang.
Try -i audio -i video -vcodec copy -acodec copy outfile

Bouke

VideoToolShed
van Oldenbarneveltstraat 33
6512 AS  NIJMEGEN, the Netherlands
+31 24 3553311

>> > *ffmpeg -i audio.mp2 -i video.mp4 -qscale 0 -shortest -strict
>> experimental
>> > output.mp4
>> > *
>> >
>> > Also, should I replace  '-qscale 0'  with  '-q:v 0'?
>>
>> You did not include the complete console output. Note that the default
>> encoder used for mp4 output (libx264 or mpeg4) depends on your ffmpeg
>> configuration, and libx264 ignores "-qscale", but you did not provide
>> enough information for me to give you any suggestions.
>>
>
> *Output is below. *Note: this is a job in progress so you don't get final
> summary.* *I can send that once it is done.
> *
> *
> /usr/bin/ffmpeg -i /export/mh_data/.../1013/audio.mp2 -i
> /export/mh_data/.../1013/screen.mp4 -qscale 0 -shortest -strict
> experimental
> /export/mh_data/.../1013/screen_804358ef-3eff-41ef-9f90-fa24144a17ab-work2.mp4
>
> ffmpeg version 1.2.1 Copyright (c) 2000-2013 the FFmpeg developers
>  built on May 10 2013 15:14:14 with gcc 4.4.6 (GCC) 20120305 (Red Hat
> 4.4.6-4)
>  configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64
> --mandir=/usr/share/man --enable-shared --enable-runtime-cpudetect
> --enable-gpl --enable-version3 --enable-postproc --enable-avfilter
> --enable-pthreads --enable-x11grab --enable-vdpau --disable-avisynth
> --enable-frei0r --enable-libopencv --enable-libdc1394 --enable-libgsm
> --enable-libmp3lame --enable-libnut --enable-libopencore-amrnb
> --enable-libopencore-amrwb --enable-libopenjpeg --enable-librtmp
> --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libvpx
> --enable-libx264 --enable-libxavs --enable-libxvid --extra-cflags='-O2 -g
> -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector
> --param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' --disable-stripping
>  libavutil      52. 18.100 / 52. 18.100
>  libavcodec     54. 92.100 / 54. 92.100
>  libavformat    54. 63.104 / 54. 63.104
>  libavdevice    54.  3.103 / 54.  3.103
>  libavfilter     3. 42.103 /  3. 42.103
>  libswscale      2.  2.100 /  2.  2.100
>  libswresample   0. 17.102 /  0. 17.102
>  libpostproc    52.  2.100 / 52.  2.100
> [mp3 @ 0x12f5b60] max_analyze_duration 5000000 reached at 5015510
> microseconds
> [mp3 @ 0x12f5b60] Estimating duration from bitrate, this may be inaccurate
> Input #0, mp3, from
> '/export/mh_data/opencast/shared/workspace/collection/1013/audio.mp2':
>  Duration: 01:19:52.53, start: 0.000000, bitrate: 192 kb/s
>    Stream #0:0: Audio: mp2, 44100 Hz, stereo, s16p, 192 kb/s
> Input #1, mov,mp4,m4a,3gp,3g2,mj2, from
> '/export/mh_data/opencast/shared/workspace/collection/1013/screen.mp4':
>  Metadata:
>    major_brand     : mp42
>    minor_version   : 0
>    compatible_brands: mp42mp41isomiso2
>    creation_time   : 2013-07-22 19:31:00
>  Duration: 01:19:59.64, start: 0.000000, bitrate: 1157 kb/s
>    Stream #1:0(eng): Video: h264 (Constrained Baseline) (avc1 /
> 0x31637661), yuv420p, 1024x768 [SAR 1:1 DAR 4:3], 1151 kb/s, 100 fps, 100
> tbr, 1k tbn, 1073741824 tbc
>    Metadata:
>      creation_time   : 2013-07-22 19:31:00
>      handler_name    : VideoHandler
> Please use -q:a or -q:v, -qscale is ambiguous
> [libx264 @ 0x1307880] using SAR=1/1
> [libx264 @ 0x1307880] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
> [libx264 @ 0x1307880] profile High, level 4.2
> [libx264 @ 0x1307880] 264 - core 130 - H.264/MPEG-4 AVC codec - Copyleft
> 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 ref=3
> deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00
> mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 
> deadzone=21,11
> fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1
> sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0
> constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1
> weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=25 scenecut=40
> intra_refresh=0 rc_lookahead=40 rc=crf mbtree=1 crf=23.0 qcomp=0.60 
> qpmin=0
> qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
> Output #0, mp4, to
> '/export/mh_data/opencast/shared/workspace/collection/1013/screen_804358ef-3eff-41ef-9f90-fa24144a17ab-work2.mp4':
>  Metadata:
>    encoder         : Lavf54.63.104
>    Stream #0:0(eng): Video: h264 ([33][0][0][0] / 0x0021), yuv420p,
> 1024x768 [SAR 1:1 DAR 4:3], q=-1--1, 12800 tbn, 100 tbc
>    Metadata:
>      creation_time   : 2013-07-22 19:31:00
>      handler_name    : VideoHandler
>    Stream #0:1: Audio: aac ([64][0][0][0] / 0x0040), 44100 Hz, stereo,
> fltp, 128 kb/s
> Stream mapping:
>  Stream #1:0 -> #0:0 (h264 -> libx264)
>  Stream #0:0 -> #0:1 (mp2 -> aac)
> Press [q] to stop, [?] for help
> frame= 6820 fps=120 q=33.0 size=    7924kB time=00:01:07.70 bitrate=
> 958.7kbits/s
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