Insert a ImageClip in a CompositeVideoClip. How to add nil audio

[harold-s]

Hello,

I'm using CompositeVideoClip to stitch a video clip and an image (which I want to display for 5 seconds)

I do something like :

video_clip = VideoFileClip(video)
image_clip =  ImageClip(image, duration=5).set_start(video_clip.duration)
CompositeVideoClip([video_clip,image_clip]).write_videofile(output_file, fps=30)

The stich works great (you can download it here : http://dl.free.fr/j41R2x8R5)

The only problem is that the video track then lasts 15 seconds (10 seconds of the video + 5 seconds of the image) and the audio track lasts 10 s and that makes the seek on VLC not work.

Any idea how I could make the audio track lasts the total length of the video (with ffmpeg anullsrc ?)

Here is the medianfo :

General
Complete name                            : /tmp/output_file.mp4
Format                                   : MPEG-4
Format profile                           : Base Media
Codec ID                                 : isom (isom/iso2/avc1/mp41)
File size                                : 3.27 MiB
Duration                                 : 15 s 0 ms
Overall bit rate                         : 1 828 kb/s
Writing application                      : Lavf57.71.100

Video
ID                                       : 1
Format                                   : AVC
Format/Info                              : Advanced Video Codec
Format profile                           : High@L4
Format settings, CABAC                   : Yes
Format settings, RefFrames               : 4 frames
Codec ID                                 : avc1
Codec ID/Info                            : Advanced Video Coding
Duration                                 : 15 s 0 ms
Bit rate                                 : 1 736 kb/s
Width                                    : 1 920 pixels
Height                                   : 1 080 pixels
Display aspect ratio                     : 16:9
Frame rate mode                          : Constant
Frame rate                               : 30.000 FPS
Color space                              : YUV
Chroma subsampling                       : 4:2:0
Bit depth                                : 8 bits
Scan type                                : Progressive
Bits/(Pixel*Frame)                       : 0.028
Stream size                              : 3.10 MiB (95%)
Writing library                          : x264 core 148 r2795 aaa9aa8
Encoding settings                        : 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

Audio
ID                                       : 2
Format                                   : MPEG Audio
Format version                           : Version 1
Format profile                           : Layer 3
Mode                                     : Joint stereo
Codec ID                                 : 6B
Duration                                 : 10 s 32 ms
Bit rate mode                            : Constant
Bit rate                                 : 128 kb/s
Channel(s)                               : 2 channels
Sampling rate                            : 44.1 kHz
Compression mode                         : Lossy
Stream size                              : 157 KiB (5%)
Default                                  : Yes
Alternate group                          : 1

[Zulko]

I haven't done that in a long time, but what happens is you just do that ?

final_clip.audio.duration = final_clip.duration

[harold-s]

Wow that just worked ...

Thank you very much indeed !!!!