[FFmpeg-user] Empty audio track to video created from image

[Brian Cardarella]

Awesome thank you!

- Brian

On Jul 19, 2011, at 5:51 PM, Etienne Buira  
<etienne.buira.lists at free.fr> wrote:

> Hi
>
> On Tue, Jul 19, 2011 at 05:16:08PM -0400, Brian Cardarella wrote:
>> I have a video from an image that I've created. The video goes for
>> about 60 frames. Then I append the content video after it using cat.
>>
>> The problem is the audio from the 2nd video starts playing when the
>> video starts, during the first video instead of when the 2nd video
>> starts.
>>
>> I'm guessing this is because the first video does not have an audio
>> track. So the audio track from the first is told to start on frame 1.
>>
>> All this to ask: is there a way to add an empty audio stream when
>> creating the 1st video to prevent this? Or am I going about this
>> backwards?
>>
>> - Brian
>
> Quoting Stefano Sabatini:
>> ffmpeg-user random tip #9
>> One minute of audio silence with ffmpeg:
>> ffmpeg -ar 48000 -t 60 -f s16le -acodec pcm_s16le -i /dev/zero  \
>>    -ab 64K -f mp2 -acodec mp2 -y silence.mp2
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