[FFmpeg-user] concat video requirements

[Tony Lambropoulos]

Ahh nevermind, what you said works when I use the concat filter and not
"ffmpeg -f concat -i file.txt...".  I had assumed they would work the same

On Mon, Jul 17, 2017 at 4:37 PM, Tony Lambropoulos <tonyl7126 at gmail.com>
wrote:

> Hey Gyan,
> I've ensured the SAR ratios and resolutions match up.  The results are
> still pretty funky, however.  The first video last far longer than it's
> supposed to and the second video is running in slow motion.  Is there
> nothing else that should match up?
>
> Here are the specs on the two input videos (first and second respectively):
>
> tony at ubuntu:/mnt/hgfs/vloop/transcoding$ ffmpeg -i /tmp/here2.mp4
>
> ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
>
>   built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
>
>   configuration: --prefix=/home/tony/ffmpeg_build
> --pkg-config-flags=--static --extra-cflags=-I/home/tony/ffmpeg_build/include
> --extra-ldflags=-L/home/tony/ffmpeg_build/lib --bindir=/home/tony/bin
> --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype
> --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis
> --enable-libvpx --enable-libx264 --enable-nonfree
>
>   libavutil      55. 34.101 / 55. 34.101
>
>   libavcodec     57. 64.101 / 57. 64.101
>
>   libavformat    57. 56.101 / 57. 56.101
>
>   libavdevice    57.  1.100 / 57.  1.100
>
>   libavfilter     6. 65.100 /  6. 65.100
>
>   libswscale      4.  2.100 /  4.  2.100
>
>   libswresample   2.  3.100 /  2.  3.100
>
>   libpostproc    54.  1.100 / 54.  1.100
>
> Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/tmp/here2.mp4':
>
>   Metadata:
>
>     major_brand     : isom
>
>     minor_version   : 512
>
>     compatible_brands: isomiso2avc1mp41
>
>     encoder         : Lavf57.56.101
>
>   Duration: 00:00:05.00, start: 0.000000, bitrate: 104 kb/s
>
>     Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p,
> 720x260 [SAR 1:1 DAR 36:13], 93 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc
> (default)
>
>     Metadata:
>
>       handler_name    : VideoHandler
>
>     Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz,
> stereo, fltp, 2 kb/s (default)
>
>     Metadata:
>
>       handler_name    : SoundHandler
>
> At least one output file must be specified
>
> tony at ubuntu:/mnt/hgfs/vloop/transcoding$ ffmpeg -i /tmp/
> 6d41bcedfe4849cf5a9a244ce159d0bd.mp4
>
> ffmpeg version 3.2.4 Copyright (c) 2000-2017 the FFmpeg developers
>
>   built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.3)
>
>   configuration: --prefix=/home/tony/ffmpeg_build
> --pkg-config-flags=--static --extra-cflags=-I/home/tony/ffmpeg_build/include
> --extra-ldflags=-L/home/tony/ffmpeg_build/lib --bindir=/home/tony/bin
> --enable-gpl --enable-libass --enable-libfdk-aac --enable-libfreetype
> --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis
> --enable-libvpx --enable-libx264 --enable-nonfree
>
>   libavutil      55. 34.101 / 55. 34.101
>
>   libavcodec     57. 64.101 / 57. 64.101
>
>   libavformat    57. 56.101 / 57. 56.101
>
>   libavdevice    57.  1.100 / 57.  1.100
>
>   libavfilter     6. 65.100 /  6. 65.100
>
>   libswscale      4.  2.100 /  4.  2.100
>
>   libswresample   2.  3.100 /  2.  3.100
>
>   libpostproc    54.  1.100 / 54.  1.100
>
> Input #0, mpegts, from '/tmp/6d41bcedfe4849cf5a9a244ce159d0bd.mp4':
>
>   Duration: 00:00:09.02, start: 1.456711, bitrate: 1003 kb/s
>
>   Program 1
>
>     Metadata:
>
>       service_name    : Service01
>
>       service_provider: FFmpeg
>
>     Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B),
> yuv420p(progressive), 720x260 [SAR 1:1 DAR 36:13], 29.97 fps, 29.97 tbr,
> 90k tbn, 59.94 tbc
>
>     Stream #0:1[0x101]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz,
> stereo, s16p, 384 kb/s
>
>
> Thanks,
>
> Tony
>
> On Mon, Jul 17, 2017 at 2:20 PM, Gyan <gyandoshi at gmail.com> wrote:
>
>> On Tue, Jul 18, 2017 at 12:37 AM, Tony Lambropoulos <tonyl7126 at gmail.com>
>> wrote:
>>
>> >
>> > Does anyone have a specific list of these attributes to ensure the
>> concat
>> > command is successful?
>> >
>>
>> For video streams, resolution and SAR have to match. Pixel format and
>> frame
>> rate need not match. Since the filter operates upon decoded frames,
>> inputs'
>> bitstream syntax i.e. codec is not relevant.
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>
>