Re: [FFmpeg-user] Prepend a single frame to a MP4 file

[Cley Faye]

2016-05-15 22:36 GMT+02:00 Virgil Stokes :

> I have created an image file (testImage.png) from which I would like to
> make a 5 second MP4 file. Then
> concatenate (prepend) this 5 second video to the test.mp4 file (as defined
> above). How can this be done in ffmpeg? Note, I am using:
>

​My approach with that would be to create a 5 second video from the image
(using something like "ffmpeg -loop 1 -framerate 29.97 -i  -c:v h264
-pix_fmt yuv420p out.mp4" then concatenate them using the concat input.
Assuming matching codecs and resolution, this would work well without
having to transcode the whole video. You might also need to add an empty
audio track to the 5s segment beforehand though.
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Re: [FFmpeg-user] Prepend a single frame to a MP4 file

[Virgil Stokes]

Here is my corrected question:

I have a YouTube MP4 video (test.mp4):

Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':
  Metadata:
major_brand : mp42
minor_version   : 0
compatible_brands: isommp42
creation_time   : 2015-10-28 06:13:56
  Duration: 00:01:35.64, start: 0.00, bitrate: 1370 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1280x720
[SAR 1:1 DAR 16:9], 1176 kb/s, 29.97 fps, 29.97 tbr, 30k tbn (default)
Metadata:
  handler_name: VideoHandler
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, flt
p, 192 kb/s (default)
Metadata:
  creation_time   : 2015-10-28 06:13:56
  handler_name: IsoMedia File Produced by Google, 5-11-2011

I have created an image file (testImage.png) from which I would like to make a 
5 second MP4 file. Then
concatenate (prepend) this 5 second video to the test.mp4 file (as defined 
above). How can this be done in ffmpeg? Note, I am using:

ffmpeg version N-79947-gcd244fa Copyright (c) 2000-2016 the FFmpeg developers
built with gcc 5.3.0 (GCC)

Sorry for the previous poorly formulated email :-(
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Re: [FFmpeg-user] Prepend a single frame to a MP4 file

[Virgil Stokes]

Ok Moritz,
How can I add a subtitle to only the first frame?

From: ffmpeg-user [ffmpeg-user-boun...@ffmpeg.org] on behalf of Moritz Barsnick 
[barsn...@gmx.net]
Sent: Sunday, May 15, 2016 19:02
To: FFmpeg user discussions
Subject: Re: [FFmpeg-user] Prepend a single frame to a MP4 file

On Sun, May 15, 2016 at 17:07:20 +0200, Virgil Stokes wrote:
> How can one prepend a single frame to an existing MP4 file downloaded from
> YouTube? The purpose of this new "first frame" is to add some identification
> information (text) to the MP4.

I don't like doubting people's goals, BUT:
A single frame wouldn't be very visible, would it? Since you would need
to use some form of concatenation (that's the key word to search for),
you would need to reencode the whole video just for the sake of the one
extra frame.

Perhaps adding metadata or subtitles would be a better alternative for
you? Both can be added without reencoding the video.

Cheers,
Moritz
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Re: [FFmpeg-user] Prepend a single frame to a MP4 file

[Moritz Barsnick]

On Sun, May 15, 2016 at 17:07:20 +0200, Virgil Stokes wrote:
> How can one prepend a single frame to an existing MP4 file downloaded from 
> YouTube? The purpose of this new "first frame" is to add some identification 
> information (text) to the MP4.

I don't like doubting people's goals, BUT:
A single frame wouldn't be very visible, would it? Since you would need
to use some form of concatenation (that's the key word to search for),
you would need to reencode the whole video just for the sake of the one
extra frame.

Perhaps adding metadata or subtitles would be a better alternative for
you? Both can be added without reencoding the video.

Cheers,
Moritz
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Re: [FFmpeg-user] Prepend a single frame to a MP4 file

[Lou]

On Sun, May 15, 2016, at 07:07 AM, Virgil Stokes wrote:
> How can one prepend a single frame to an existing MP4 file downloaded
> from 
> YouTube? The purpose of this new "first frame" is to add some
> identification 
> information (text) to the MP4.

Please show info about your input file and your ffmpeg version. Show the
complete output of:

ffmpeg -i input.mp4
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[FFmpeg-user] Prepend a single frame to a MP4 file

[Virgil Stokes]

How can one prepend a single frame to an existing MP4 file downloaded from 
YouTube? The purpose of this new "first frame" is to add some identification 
information (text) to the MP4.




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