Thanks. Sorry I should have included that info.
I have two files.. both are the same.. DNxHR SQ codec. Usually they are about
45mins each, sometimes different depending on if my battery died while filming!
Sports games.
They reside on an SSD drive. I am on Windows 10 Home. I have a txt file set up
demux.txt. The call I do is:
ffmpeg -f concat -safe 0 -i demux.txt -c copy output.movthe .mov is the
container the DNxHR SQ files are in, and after letting it run for hours, the
result worked. In that I got a DNxHR SQ file with the two files concatenated.
This is the output I got when running it. Initially it started at 50fps, but
quickly went to 15fps, then soon after .1fps.
ffmpeg version 3.3.3 Copyright (c) 2000-2017 the FFmpeg developers built with
gcc 7.1.0 (GCC) configuration: --enable-gpl --enable-version3 --enable-cuda
--enable-cuvid --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-nvenc
--enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r
--enable-gnutls --enable-iconv --enable-libass --enable-libbluray
--enable-libbs2b --enable-libcaca --enable-libfreetype --enable-libgme
--enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264
--enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libsnappy
--enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame
--enable-libvidstab --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx
--enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265
--enable-libxavs --enable-libxvid --enable-libzimg --enable-lzma --enable-zlib
libavutil 55. 58.100 / 55. 58.100 libavcodec 57. 89.100 / 57. 89.100
libavformat 57. 71.100 / 57. 71.100 libavdevice 57. 6.100 / 57. 6.100
libavfilter 6. 82.100 / 6. 82.100 libswscale 4. 6.100 / 4. 6.100
libswresample 2. 7.100 / 2. 7.100 libpostproc 54. 5.100 / 54.
5.100[mov,mp4,m4a,3gp,3g2,mj2 @ 0000000000e6bb80] overread end of atom '⌐mak'
by 2 bytes[mov,mp4,m4a,3gp,3g2,mj2 @ 0000000000e6bb80] overread end of atom
'⌐swr' by 3 bytes[concat @ 0000000000e624a0] Could not find codec parameters
for stream 1 (Unknown: none): unknown codecConsider increasing the value for
the 'analyzeduration' and 'probesize' optionsInput #0, concat, from
'demux.txt': Duration: N/A, start: 0.000000, bitrate: 461960 kb/s Stream
#0:0(eng): Video: dnxhd (DNXHR SQ) (AVdh / 0x68645641), yuv422p(tv, bt709,
progressive), 3840x2160, 461960 kb/s, SAR 1:1 DAR 16:9, 23.98 fps, 23.98 tbr,
24k tbn, 24k tbc Metadata: creation_time :
2024-10-10T23:17:36.000000Z encoder : Avid DNxHR Codec Stream
#0:1: Unknown: noneOutput #0, mov, to 'output.mov': Metadata: encoder
: Lavf57.71.100 Stream #0:0(eng): Video: dnxhd (DNXHR SQ) (AVdh /
0x68645641), yuv422p(tv, bt709, progressive), 3840x2160 [SAR 1:1 DAR 16:9],
q=2-31, 461960 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 24k tbc Metadata:
creation_time : 2024-10-10T23:17:36.000000Z encoder : Avid DNxHR
CodecStream mapping: Stream #0:0 -> #0:0 (copy)Press [q] to stop, [?] for
helpframe= 75 fps= 15 q=-1.0 size= 176400kB time=00:00:03.08
bitrate=468196.6kbits/s speed=0.621x
On Wednesday, October 18, 2017, 1:16:40 AM PDT, Cley Faye
<[email protected]> wrote:
2017-10-18 3:17 GMT+02:00 Kevin Duffey <[email protected]
>:
> Yup. I do not specify the output. I just use the same .mov file extension
> as the two source files. Is it possible even though I specify -c copy
> out.mov it is rendering and not Concat??
>
>
>
You really should provide a minimal command line reproducing the issue and
the output of ffmpeg, otherwise it will be impossible to divine what's
happening.
Or, if you want a general answer, no, concat should be fast assuming that
I/O are fast and the output muxer is fast. Without more information it is
hard to say anything more.
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