[FFmpeg-user] Wrong concat video

[Francois Visagie]

> -----Original Message-----
> From: ffmpeg-user-bounces at ffmpeg.org [mailto:ffmpeg-user-
> bounces at ffmpeg.org] On Behalf Of Max Grigoriev
> Sent: 28 May 2014 20:36
> To: ffmpeg-user at ffmpeg.org
> Subject: [FFmpeg-user] Wrong concat video
> 
> Hi,
> 
> I have two video which should be merged together.

When you say merge, I assume you mean sequentially concatenated?

> 
> Video #1 info
> 
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
> 'single_params_file____Users_max.grigoriev_webamg_video-
> editor_src_test_resources_om.png.mp4':
> 
>   Metadata:
> 
>     major_brand     : isom
> 
>     minor_version   : 512
> 
>     compatible_brands: isomiso2avc1mp41
> 
>     encoder         : Lavf55.33.100
> 
>   Duration: 00:00:10.08, start: 0.033333, bitrate: 164 kb/s
> 
>     Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
> 1920x1080 [SAR 1:1 DAR 16:9], 4300 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc
> (default)
> 
>     Metadata:
> 
>       handler_name    : VideoHandler
> 
>     Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 48000 Hz, mono,
fltp,
> 128 kb/s (default)
> 
>     Metadata:
> 
>       handler_name    : SoundHandler
> 
> Video #2 info
> 
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from
> 'single_params_file____Users_max.grigoriev_webamg_video-
> editor_src_test_resources_a5732-480x320-clip01-sound.mp4':
> 
>   Metadata:
> 
>     major_brand     : isom
> 
>     minor_version   : 512
> 
>     compatible_brands: isomiso2avc1mp41
> 
>     encoder         : Lavf55.33.100
> 
>   Duration: 00:00:15.15, start: 0.050000, bitrate: 2561 kb/s
> 
>     Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
> 1920x1080 [SAR 1:1 DAR 16:9], 2444 kb/s, 29.97 fps, 29.97 tbr, 30k tbn,
> 59.94 tbc (default)
> 
>     Metadata:
> 
>       handler_name    : VideoHandler
> 
>     Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 32000 Hz, stereo,
fltp,
> 128 kb/s (default)
> 
>     Metadata:
> 
>       handler_name    : SoundHandler
> 
> When I run
> "ffmpeg -i video1.mp4  -i video2.mp4 -filter_complex '[0:0] [0:1] [1:0]
[1:1]
> concat=n=2:v=1:a=1 [v] [a]' -map '[v]' -map '[a]'  output.mp4"
> 
> Then I have wrong output. video1 is shown for a moment less than a second
> and then remaining time of video1 there's first frame from video2 then
> video2 is played as expected. If I change merge order and make video2 +
> video1 then everything is OK.

I'm not familiar with usage of the concat filter, but I believe its usage
here is over-complicating the solution as compared to either of the very
simple concat demuxer or protocol:
http://trac.ffmpeg.org/wiki/How%20to%20concatenate%20%28join,%20merge%29%20m
edia%20files.

> 
> What can be root of problem?
> Thanks.
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