How to play 2 video files on the same time with the same timecode?

[marcorocchini]

Hi all

and I'm a cat

Please can I wonder a question? I have 2 files:

A.MXF
that have almost the same timecode of
B.MXF

We can suppose that A.MXF have timecode starting from 13:39:40,00

and B.MXF have timecode starting from 13:39:50,00

A.MXF and B.MXF are present on the same folder


We already suppose that A.MXF have as final timecode: 13:45:16,00

and B.MXF have as final timecode: 13:43:00

I would like do a "program" (ffplay?) that analyze the timecode of A.MXF and the timecode of B.MXF and playback in syncronous on the pc-desktop the 2 files on 2 separate windows starting from the common minimum interval timecode that are (in this case) 13:39:50,00 until 13:43:00


How can I do? thanks

ps: I don't need to see timecode as picture on the screen, "simply" I need to playback on 2 windows the 2 video files in the part of video that have a common timecode

[poisondeathray]

One way is to play them with an avisynth script , using StackHorizontal or StackVertical

You can use Trim() to align them on which frames you want them to start on

[marcorocchini]

mmm poison are you meaning to do an .avs file that have a program1 video stream and program2 video stream in witch the trim is the common part [referred to the timecode] of a.mxf and b.mxf? and then play this .avs for example with vlc

[pandy]

Use ffmpeg.

https://trac.ffmpeg.org/wiki/Create%20a%20mosaic%20out%20of%20several%20input%20videos

[marcorocchini]

mmm but maybe if I well understand in this way ffmpeg generate and output file with the "mosaic" of the inputs. But I need the screen playback only between 2 input video files, however is interesting thanks

[poisondeathray]

avisynth doesn't work in timecodes, so convert the start and end points to frames using math.

e.g if you want to start at 1 min exactly , and it's 25fps content,

25frames/s * 60s/min * 1min = 1500 frames

So the start point for 1 min would be Trim(1500,0) if you wanted to play to the end (that's what the ,0 is for)

You can use showtime() to overlay the time on each clip if it helps, and/or showframenumber()

[pandy]

[Attachment 32343 - Click to enlarge]


mmm but maybe if I well understand in this way ffmpeg generate and output file with the "mosaic" of the inputs. But I need the screen playback only between 2 input video files, however is interesting thanks

Sorry, my fault, completely forgot about cats... use instead ffmpeg (from same package) ffplay where video is visible on screen...

[marcorocchini]

I have upload A.MXF and B.MXF with a sincronous timecode (there are connected to the cameras a timecode generator, it's connected also to the betacam deck shown in the video. I personally check from above that the timecode was exactly sincronous to all)

please download:

https://www.dropbox.com/s/asjcilbo88nnlhs/A.MXF?dl=0

https://www.dropbox.com/s/clfgx0kp6qidasy/B.MXF?dl=0

so that this is the situation



I try to understand if there is way to playback the common part of the 2 video files, in 2 windows, in this case the start and stop of the playback have to be the total lenght of the B.MXF

[marcorocchini]

with FFPLAY I have try

ffplay -b.mxf -an

and playback is fine, but only of the b.mxf file

How can I playback both a.mxf and b.mxf in 2 separate windows? thanks

OR

with avisynth how can it possibile create 2 video stream?

[pandy]

How can I playback both a.mxf and b.mxf in 2 separate windows? thanks

Create batch file with:

@start ffplay -i %1 -an
@start ffplay -i %2 -an

@pause
@exit

Execute batch file with two file names e.g. batch.cmd filename1 filename2

[marcorocchini]

it "works" but I need to make start the A.mxf from the timecode (starting) of B.mxf and put besides the 2 windows as this

[jagabo]

Replace Bob() with whatever deinterlacer you want.

a = ffVideoSource("A.MXF").Bob().Trim(111, 0).BilinearResize(960, 540)
b = ffVideoSource("B.MXF").Bob().ConvertToYV12().BilinearResize(960, 540)
StackHorizontal(a, b)

[marcorocchini]

Replace Bob() with whatever deinterlacer you want.

a = ffVideoSource("A.MXF").Bob().Trim(111, 0).BilinearResize(960, 540)
b = ffVideoSource("B.MXF").Bob().ConvertToYV12().BilinearResize(960, 540)
StackHorizontal(a, b)

seems a nice avs

[marcorocchini]

is there a way to say to avisynth that the playback have to stop when the first or second video clip finisced to playback? in this case to stop playback when B.MXF has finisced to play? thanks

[jagabo]

Trim() off the end of the video. Add this to the end of my earlier script:

a.framecount < b.framecount ? Trim(0,a.framecount) : Trim(0, b.framecount)

[poisondeathray]

jagabo , it won't matter in this case since you're trimming off the end, but shouldn't it be framecount-1 for trimming the endframe ?

e.g if he wanted to stop 1 frame early, it would be framecount-2 since numbering starts at zero

[jagabo]

Yes, framecount-1 would be more precise.