[FFmpeg-user] Gnarly ffmpeg multi-stream demux challenge test clip
David Favor
david at davidfavor.com
Tue Sep 4 03:34:16 CEST 2012
Attempting to demux (copy) two video streams from
one video to another, dropping the audio.
These video clips are Skype recordings with one
video and one audio track per each caller in a
group call.
The audio has to be extracted + normalized, which
works fine.
Problem is the video. The source video plays/previews
in QuickTime with each video side-by-side. The source
video also works great dropping into other video editors
like ScreenFlow or iMovie.
Attempting to copy only video streams (audio dropped)
produces an output file with all the videos stacked
on top of each other.
The output video is uneditable by any software I have.
No way to move videos from off the top of each other.
There's a copy of the source video here:
http://DavidFavor.com/private/2012/foo.skype.mov
There's a YouTube video detailing the challenge here:
http://YouTube.com/watch?v=eabMRPb5zEQ
The command I'm using for the extraction is:
ffmpeg -y -i foo.skype.mov -an -vcodec copy -map 0:2 -map 0:3 foo.video.mov
The output stream mapping appears correct:
... ... ...
Stream mapping:
Stream #0:2 -> #0:0 (copy)
Stream #0:3 -> #0:1 (copy)
... ... ...
Here's a stream dump of the source video and a complete dump of the
ffmpeg output from the extraction command.
I'd appreciate an ffmpeg guru passing along the correct syntax.
Thanks!
_______
David-Favor-iMac> ffmpeg -i foo.skype.mov
ffmpeg version 0.11.1.git-56ae592 Copyright (c) 2000-2012 the FFmpeg developers
built on Sep 3 2012 11:56:20 with gcc 4.2.1 (Apple Inc. build 5666) (dot 3)
configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-libmp3lame
--enable-libvorbis --enable-libtheora --enable-libschroedinger --enable-libopenjpeg
--enable-libmodplug --enable-libvpx --enable-libspeex --mandir=/opt/local/share/man --enable-shared
--enable-pthreads --cc=/usr/bin/gcc-4.2 --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc
--enable-libx264 --enable-libxvid --enable-nonfree --enable-libfaac
libavutil 51. 65.100 / 51. 65.100
libavcodec 54. 41.100 / 54. 41.100
libavformat 54. 17.100 / 54. 17.100
libavdevice 54. 1.100 / 54. 1.100
libavfilter 3. 2.100 / 3. 2.100
libswscale 2. 1.100 / 2. 1.100
libswresample 0. 15.100 / 0. 15.100
libpostproc 52. 0.100 / 52. 0.100
Guessed Channel Layout for Input Stream #0.0 : mono
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'foo.skype.mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
creation_time : 2011-02-25 16:50:37
Duration: 00:08:17.90, start: 0.000000, bitrate: 5388 kb/s
Stream #0:0(eng): Audio: pcm_f32le (fl32 / 0x32336C66), 44100 Hz, mono, flt, 1411 kb/s
Metadata:
creation_time : 2011-02-25 16:50:37
handler_name : Apple Alias Data Handler
Stream #0:1(eng): Audio: pcm_f32le (fl32 / 0x32336C66), 44100 Hz, stereo, flt, 2822 kb/s
Metadata:
creation_time : 2011-02-25 16:50:37
handler_name : Apple Alias Data Handler
Stream #0:2(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 640x480, 350 kb/s, 15 fps,
15.08 tbr, 1k tbn, 2k tbc
Metadata:
creation_time : 2011-02-25 16:50:37
handler_name : Apple Alias Data Handler
Stream #0:3(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 640x480, 801 kb/s, 15 fps,
15.08 tbr, 1k tbn, 2k tbc
Metadata:
creation_time : 2011-02-25 16:50:37
handler_name : Apple Alias Data Handler
At least one output file must be specified
_______
David-Favor-iMac> ffmpeg -y -i foo.skype.mov -an -vcodec copy -map 0:2 -map 0:3 foo.video.mov
ffmpeg version 0.11.1.git-56ae592 Copyright (c) 2000-2012 the FFmpeg developers
built on Sep 3 2012 11:56:20 with gcc 4.2.1 (Apple Inc. build 5666) (dot 3)
configuration: --prefix=/opt/local --enable-swscale --enable-avfilter --enable-libmp3lame
--enable-libvorbis --enable-libtheora --enable-libschroedinger --enable-libopenjpeg
--enable-libmodplug --enable-libvpx --enable-libspeex --mandir=/opt/local/share/man --enable-shared
--enable-pthreads --cc=/usr/bin/gcc-4.2 --arch=x86_64 --enable-yasm --enable-gpl --enable-postproc
--enable-libx264 --enable-libxvid --enable-nonfree --enable-libfaac
libavutil 51. 65.100 / 51. 65.100
libavcodec 54. 41.100 / 54. 41.100
libavformat 54. 17.100 / 54. 17.100
libavdevice 54. 1.100 / 54. 1.100
libavfilter 3. 2.100 / 3. 2.100
libswscale 2. 1.100 / 2. 1.100
libswresample 0. 15.100 / 0. 15.100
libpostproc 52. 0.100 / 52. 0.100
Guessed Channel Layout for Input Stream #0.0 : mono
Guessed Channel Layout for Input Stream #0.1 : stereo
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'foo.skype.mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
creation_time : 2011-02-25 16:50:37
Duration: 00:08:17.90, start: 0.000000, bitrate: 5388 kb/s
Stream #0:0(eng): Audio: pcm_f32le (fl32 / 0x32336C66), 44100 Hz, mono, flt, 1411 kb/s
Metadata:
creation_time : 2011-02-25 16:50:37
handler_name : Apple Alias Data Handler
Stream #0:1(eng): Audio: pcm_f32le (fl32 / 0x32336C66), 44100 Hz, stereo, flt, 2822 kb/s
Metadata:
creation_time : 2011-02-25 16:50:37
handler_name : Apple Alias Data Handler
Stream #0:2(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 640x480, 350 kb/s, 15 fps,
15.08 tbr, 1k tbn, 2k tbc
Metadata:
creation_time : 2011-02-25 16:50:37
handler_name : Apple Alias Data Handler
Stream #0:3(eng): Video: h264 (Main) (avc1 / 0x31637661), yuv420p, 640x480, 801 kb/s, 15 fps,
15.08 tbr, 1k tbn, 2k tbc
Metadata:
creation_time : 2011-02-25 16:50:37
handler_name : Apple Alias Data Handler
Output #0, mov, to 'foo.video.mov':
Metadata:
major_brand : qt
minor_version : 537199360
compatible_brands: qt
encoder : Lavf54.17.100
Stream #0:0(eng): Video: h264 (avc1 / 0x31637661), yuv420p, 640x480, q=2-31, 350 kb/s, 15 fps,
1k tbn, 1k tbc
Metadata:
creation_time : 2011-02-25 16:50:37
handler_name : Apple Alias Data Handler
Stream #0:1(eng): Video: h264 (avc1 / 0x31637661), yuv420p, 640x480, q=2-31, 801 kb/s, 15 fps,
1k tbn, 1k tbc
Metadata:
creation_time : 2011-02-25 16:50:37
handler_name : Apple Alias Data Handler
Stream mapping:
Stream #0:2 -> #0:0 (copy)
Stream #0:3 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 7469 fps=5148 q=-1.0 Lq=-1.0 size= 70195kB time=00:08:17.74 bitrate=1155.3kbits/s
video:70007kB audio:0kB subtitle:0 global headers:0kB muxing overhead 0.267434%
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