[FFmpeg-user] Extract audio from video and use one frame as cover image

[Gyan Doshi]

On 09-01-2021 08:06 am, Bernhard Döbler wrote:
> Am 08.01.2021 um 05:18 schrieb Gyan Doshi:
>>
>> On 08-01-2021 06:37, Bernhard Döbler wrote:
>>>
>>> I have video files. I want to extract the audio and use one single 
>>> frame from the video track as cover image.
>>> The command line looks like this
>>> ffmpeg.exe -y -i "e:\01. Video.mp4" -filter:v 
>>> "select=between(145\,prev_pts*TB\,pts*TB)" -frames:v 1 -c:a copy 
>>> -c:v mjpeg -q:v 2 -disposition:v:0 attached_pic "e:\01. Audio.m4a"
>>>
>>> This is supposed to embed a frame from around second 145 as cover 
>>> image.
>>> The issue is that the whole processing of the file stops after the 
>>> single image was extracted and my resulting file has a length of 
>>> 2:25 minutes. I want the audio file to be as long as the video.
>>
>> `-frames` is set to terminate the output when fulfilled. Use trim 
>> within the filtergraph.
>>
>> ffmpeg.exe -y -i "e:\01. Video.mp4" -filter:v 
>> "select=between(145\,prev_pts*TB\,pts*TB),trim=end_frame=1" -c:a copy 
>> -c:v mjpeg -q:v 2 -disposition:v:0 attached_pic "e:\01. Audio.m4a"
>
>
> Thank you for your answer.
>
> The console eventually reads
>
> More than 1000 frames duplicated
> [ipod @ 00000299cb43de80] Got more than one picture in stream 0, 
> ignoring.
>
> when I call your command as is.

Inefficient, but those extra images aren't muxed into the output. That's 
what the ignoring msg means.

You can avoid the duplication by adding  `-vsync vfr`.

For your workaround, mpdecimate is not relevant, only the setpts filter.

Regards,
Gyan