Add a video stream to an existing mpg from MythTV

[nublaii]

I am recording both tv and radio channels with my mythtv installation, and the resulting mpg files for radio channels only have (obviously) one audio track.

The software we use to process video is able to get the tv (video+audio) mpgs just fine, but it chokes with the radio ones, because the files doesn't contain a video track.

What would be the easiest way of adding a black/white frame for the whole (arbitrary) length of the mpg?

I am trying to run this on a linux box by the way, so I have the usual suspects to help (ffmpeg, mencoder, etc etc)

This is the output I get from mediainfo on the file I get from mythtv

General
ID                               : 3F4
Complete name                    : 535 (RNE1) - Mon Sep 20 06-00-00 2010.mpg..mpg
Format                           : MPEG-TS
File size                        : 404 MiB
Duration                         : 59mn 41s
Overall bit rate                 : 947 Kbps

Audio
ID                               : 2001 (0x7D1)
Menu ID                          : 1 (0x1)
Format                           : MPEG Audio
Format version                   : Version 1
Format profile                   : Layer 2
Duration                         : 59mn 41s
Bit rate mode                    : Constant
Bit rate                         : 192 Kbps
Channel(s)                       : 2 channels
Sampling rate                    : 48.0 KHz
Stream size                      : 82.0 MiB (20%)
Language                         : Spanish

[bat999]

..

[Baldrick]

Maybe something like

ffmpeg -loop_input -r 1 -i image.jpg -i video.mpg -acodec copy video.mpg

image.jpg is just an image you make and video.mpg is your source video.


edit: too slow....

[nublaii]

Yup... I was checking it on a 1 hour long file. Went to lunch and 2 hours later it was still going...

[bat999]

..

[nublaii]

I tried it with a small image, and it was really fast, but apparently our system requires real video frame size, so in the end I had to trade speed for compatibility.

This is what I did to generate a black frame

convert -size 720x576 xc:black canvas.jpg

And this is the line I used to put it in

/usr/bin/ffmpeg -loop_input -i canvas.jpg -i \"$filename\" -shortest -f mpegts -acodec copy \"$tmpfile\" >> \"$tmpdir/remuxradio.log\" 2>> \"$tmpdir/remuxradio.log\"

Tnx