[FFmpeg-user] Gnarly ffmpeg multi-stream demux challenge test clip
David Favor
david at davidfavor.com
Fri Sep 7 16:49:01 CEST 2012
Roger Pack wrote:
>> Attempting to copy only video streams (audio dropped)
>> produces an output file with all the videos stacked
>> on top of each other.
>
> What if you include the audio?
>
>> The output video is uneditable by any software I have.
>> No way to move videos from off the top of each other.
>
> It seems from your youtube that it only "sees one side" in playback,
> is that right?
Correct.
>> 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
>
> What if you try .mkv?
.mkv is a no-go as no software really understands this format.
The resulting file has to be able to drop into QuickTime, ScreenFlow,
iMovie, Final Cut, Kdenlive...
> What is the output of mediainfo for the resultant file?
Hum... mediainfo-7.6.0 output shows no directives about position
of videos, that I see... Here's the output...
David-Favor-iMac> mediainfo foo.skype.mov
General
Complete name : foo.skype.mov
Format : MPEG-4
Format profile : QuickTime
Codec ID : qt
File size : 320 MiB
Duration : 8mn 17s
Overall bit rate : 5 389 Kbps
Encoded date : UTC 2011-02-25 16:50:37
Tagged date : UTC 2011-02-25 16:58:55
Writing library : Apple QuickTime
Video #1
ID : 3
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main at L3.0
Format settings, CABAC : No
Format settings, ReFrames : 2 frames
Format settings, GOP : M=1, N=30
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 8mn 17s
Bit rate : 350 Kbps
Width : 640 pixels
Height : 480 pixels
Display aspect ratio : 4:3
Frame rate mode : Variable
Frame rate : 15.000 fps
Minimum frame rate : 6.289 fps
Maximum frame rate : 29.412 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.076
Stream size : 20.8 MiB (6%)
Language : English
Encoded date : UTC 2011-02-25 16:50:37
Tagged date : UTC 2011-02-25 16:58:55
Color primaries : BT.601 NTSC
Transfer characteristics : BT.709
Matrix coefficients : BT.601
Video #2
ID : 4
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main at L3.0
Format settings, CABAC : No
Format settings, ReFrames : 2 frames
Format settings, GOP : M=1, N=30
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 8mn 17s
Bit rate : 802 Kbps
Width : 640 pixels
Height : 480 pixels
Display aspect ratio : 4:3
Frame rate mode : Variable
Frame rate : 15.000 fps
Minimum frame rate : 10.870 fps
Maximum frame rate : 29.412 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.174
Stream size : 47.6 MiB (15%)
Language : English
Encoded date : UTC 2011-02-25 16:50:37
Tagged date : UTC 2011-02-25 16:58:55
Color primaries : BT.601 NTSC
Transfer characteristics : BT.709
Matrix coefficients : BT.601
Audio #1
ID : 1
Format : PCM
Codec ID : fl32
Codec ID/Hint :
Duration : 8mn 17s
Bit rate mode : Constant
Bit rate : 706 Kbps
Channel(s) : 1 channel
Sampling rate : 44.1 KHz
Bit depth : 16 bits
Stream size : 41.9 MiB (13%)
Language : English
Encoded date : UTC 2011-02-25 16:50:37
Tagged date : UTC 2011-02-25 16:58:55
Audio #2
ID : 2
Format : PCM
Codec ID : fl32
Codec ID/Hint :
Duration : 8mn 17s
Bit rate mode : Constant
Bit rate : 1 411 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 44.1 KHz
Bit depth : 16 bits
Stream size : 83.8 MiB (26%)
Language : English
Encoded date : UTC 2011-02-25 16:50:37
Tagged date : UTC 2011-02-25 16:58:55
> Cheers!
> -r
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