Concatenating an image with a video with ffmpeg

Question

I have a video that is downloaded with youtube-dl. I want to create a video that is made out of an image and the downloaded video, using ffmpeg and the loop function.

./ffmpeg -f concat -safe 0 -i list.txt -c copy merged.mp4

Inside of my list.txt file is

file word_img.jpg
file youtube_video.mp4

Running the command at the bottom creates a new video. It's just that the it's the same exact thing as the youtube video. The other image never gets added. Could this have to do with the encoding?

I also tried another approach which went something like this.

./ffmpeg -t 125 -async 1 -i youtube_video.mp4
   -t 5 -i word_img.jpg 
   -filter_complex "[0]loop=149:1:0[bgheld5]; 
                    [1]loop=149:1:0[fgheld5]; 
                    [bgheld5][fgheld5]overlay=eof_action=pass" out.mp4

This sort of works. There is a static image that get displayed for 5 seconds and then the 30 second youtube video gets played. The problems is that the audio and the video of the youtube video are out of sync by about 5 seconds.

Running ./ffmpeg -i img.jpg returns the following

Input #0, image2, from 'img.jpg':
Duration: 00:00:00.04, start: 0.000000, bitrate: 1258 kb/s
Stream #0:0: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 640x356 [SAR 96:96 DAR 160:89], 25 tbr, 25 tbn, 25 tbc

Running ./ffmpeg -i video.mp4 returns the following

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video.mp4':
Metadata:
major_brand     : isom
minor_version   : 512
compatible_brands: isomiso2avc1mp41
encoder         : Lavf58.26.101
Duration: 00:02:00.04, start: 0.000000, bitrate: 575 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 640x356 [SAR 1:1 DAR 160:89], 440 kb/s, 24.98 fps, 24.98 tbr, 25k tbn, 49.95 tbc (default)
Metadata:
  handler_name    : ISO Media file produced by Google Inc. Created on: 
10/28/2018.
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 128 kb/s (default)
Metadata:
  handler_name    : ISO Media file produced by Google Inc. Created on: 10/28/2018

slhck · Accepted Answer

I am assuming you have a static image file and a video that you would like to concatenate. The image should be shown for five seconds without audio; the video should follow.

You can run everything in one command with:

ffmpeg 
  -loop 1 -framerate 24 -t 5 -i image.png 
  -f lavfi -t 1 -i anullsrc 
  -i video.mp4 
  -filter_complex " 
    [2:v]scale=320:240,setsar=sar=1[video]; 
    [0:v][1:a][video][2:a]concat=n=2:v=1:a=1 
  " output.mp4

What it does:

Specify the image as input 0, looping it up to a length of 5 s at 24 fps.
Specify silent audio as second input 1, which is needed for concatenation
Specify the video as third input 2
Scale the video to the same size as the image (but you could of course also scale the image… just swap the input identifiers 2:v to 1:v and rename the label video)
Set its sample aspect ratio to 1 (this is a quick fix for differing SARs; you may have to be more explicit like shown here)
Concatenate logo + silent audio with the video.

You can also use the scale2ref filter (another example here) to scale the logo to the video:

-filter_complex " 
  [0:v][2:v]scale2ref[logo][video]; 
  [logo]setsar=sar=1[logo];  
  [logo][1:a][video][2:a]concat=n=2:v=1:a=1 
"

Concatenating an image with a video with ffmpeg

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