I need to concatenate several mp4 files that were taken with a cell phone,
where some of them are landscape and others portrait. By simply concatenate
them, the ones that are portrait end up rotated by 90 degrees in the final
output.
To solve this problem, I decided to rotate the portrait ones one by one
before concatenating them. However, when I concatenate landscape together
with rotated portrait, I get the following error messages:
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001b2922b0fc0] Auto-inserting h264_mp4toannexb
bitstream filter
[vost#0:0/copy @ 000001b292c6d1c0] Non-monotonic DTS; previous: 824975,
current: 140284; changing to 824976. This may result in incorrect timestamps
in the output file.
[vost#0:0/copy @ 000001b292c6d1c0] Non-monotonic DTS; previous: 824976,
current: 140796; changing to 824977. This may result in incorrect timestamps
in the output file.
[vost#0:0/copy @ 000001b292c6d1c0] Non-monotonic DTS; previous: 824977,
current: 141308; changing to 824978. This may result in incorrect timestamps
in the output file.
.....hundreds more like this.
In addition, when I watch the video, the portrait one seems to be static on
one of the first frames. This frame is shown for the duration of the video.
Why is this happening and how can I fix it?
This is my output:
D:\99_FFMpeg>D:\01_Apl\ffmpeg_2024\bin\ffmpeg -y -f concat -safe 0 -i
merge_list.txt -c copy merged.mp4
ffmpeg version 2024-05-23-git-ece95dc3dc-full_build-www.gyan.dev Copyright
(c) 2000-2024 the FFmpeg developers
built with gcc 13.2.0 (Rev5, Built by MSYS2 project)
configuration: --enable-gpl --enable-version3 --enable-static
--disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv
--enable-gnutls --enable-libxml2 --enable-gmp --enable-bzlib --enable-lzma
--enable-libsnappy --enable-zlib --enable-librist --enable-libsrt
--enable-libssh --enable-libzmq --enable-avisynth --enable-libbluray
--enable-libcaca --enable-sdl2 --enable-libaribb24 --enable-libaribcaption
--enable-libdav1d --enable-libdavs2 --enable-libuavs3d --enable-libxevd
--enable-libzvbi --enable-librav1e --enable-libsvtav1 --enable-libwebp
--enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxeve
--enable-libxvid --enable-libaom --enable-libjxl --enable-libopenjpeg
--enable-libvpx --enable-mediafoundation --enable-libass --enable-frei0r
--enable-libfreetype --enable-libfribidi --enable-libharfbuzz
--enable-liblensfun --enable-libvidstab --enable-libvmaf --enable-libzimg
--enable-amf --enable-cuda-llvm --enable-cuvid --enable-dxva2
--enable-d3d11va --enable-d3d12va --enable-ffnvcodec --enable-libvpl
--enable-nvdec --enable-nvenc --enable-vaapi --enable-libshaderc
--enable-vulkan --enable-libplacebo --enable-opencl --enable-libcdio
--enable-libgme --enable-libmodplug --enable-libopenmpt
--enable-libopencore-amrwb --enable-libmp3lame --enable-libshine
--enable-libtheora --enable-libtwolame --enable-libvo-amrwbenc
--enable-libcodec2 --enable-libilbc --enable-libgsm
--enable-libopencore-amrnb --enable-libopus --enable-libspeex
--enable-libvorbis --enable-ladspa --enable-libbs2b --enable-libflite
--enable-libmysofa --enable-librubberband --enable-libsoxr
--enable-chromaprint
libavutil 59. 19.100 / 59. 19.100
libavcodec 61. 5.104 / 61. 5.104
libavformat 61. 3.103 / 61. 3.103
libavdevice 61. 2.100 / 61. 2.100
libavfilter 10. 2.102 / 10. 2.102
libswscale 8. 2.100 / 8. 2.100
libswresample 5. 2.100 / 5. 2.100
libpostproc 58. 2.100 / 58. 2.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001b2922910c0] Auto-inserting h264_mp4toannexb
bitstream filter
Input #0, concat, from 'merge_list.txt':
Duration: N/A, start: 0.000000, bitrate: 17345 kb/s
Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv,
bt709, progressive), 1920x1080, 17088 kb/s, 30 fps, 30 tbr, 90k tbn
Metadata:
creation_time : 2024-05-23T13:02:03.000000Z
handler_name : VideoHandle
vendor_id : [0][0][0][0]
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo,
fltp, 256 kb/s
Metadata:
creation_time : 2024-05-23T13:02:03.000000Z
handler_name : SoundHandle
vendor_id : [0][0][0][0]
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Output #0, mp4, to 'merged.mp4':
Metadata:
encoder : Lavf61.3.103
Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv,
bt709, progressive), 1920x1080, q=2-31, 17088 kb/s, 30 fps, 30 tbr, 90k tbn
Metadata:
creation_time : 2024-05-23T13:02:03.000000Z
handler_name : VideoHandle
vendor_id : [0][0][0][0]
Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo,
fltp, 256 kb/s
Metadata:
creation_time : 2024-05-23T13:02:03.000000Z
handler_name : SoundHandle
vendor_id : [0][0][0][0]
Press [q] to stop, [?] for help
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001b2922b0fc0] Auto-inserting h264_mp4toannexb
bitstream filter
[vost#0:0/copy @ 000001b292c6d1c0] Non-monotonic DTS; previous: 824975,
current: 140284; changing to 824976. This may result in incorrect timestamps
in the output file.
[vost#0:0/copy @ 000001b292c6d1c0] Non-monotonic DTS; previous: 824976,
current: 140796; changing to 824977. This may result in incorrect timestamps
in the output file.
[vost#0:0/copy @ 000001b292c6d1c0] Non-monotonic DTS; previous: 824977,
current: 141308; changing to 824978. This may result in incorrect timestamps
in the output file.
[vost#0:0/copy @ 000001b292c6d1c0] Non-monotonic DTS; previous: 824978,
current: 141820; changing to 824979. This may result in incorrect timestamps
in the output file.
[vost#0:0/copy @ 000001b292c6d1c0] Non-monotonic DTS; previous: 824979,
current: 142332; changing to 824980. This may result in incorrect timestamps
in the output file.
[vost#0:0/copy @ 000001b292c6d1c0] Non-monotonic DTS; previous: 824980,
current: 142844; changing to 824981. This may result in incorrect timestamps
in the output file.
.I removed hundreds of similar messages to reduce the size of this email.
[vost#0:0/copy @ 000001b292c6d1c0] Non-monotonic DTS; previous: 825241,
current: 276476; changing to 825242. This may result in incorrect timestamps
in the output file.
[vost#0:0/copy @ 000001b292c6d1c0] Non-monotonic DTS; previous: 825242,
current: 276988; changing to 825243. This may result in incorrect timestamps
in the output file.
[vost#0:0/copy @ 000001b292c6d1c0] Non-monotonic DTS; previous: 825243,
current: 277500; changing to 825244. This may result in incorrect timestamps
in the output file.
[vost#0:0/copy @ 000001b292c6d1c0] Non-monotonic DTS; previous: 825244,
current: 278012; changing to 825245. This may result in incorrect timestamps
in the output file.
[out#0/mp4 @ 000001b292276940] video:21041KiB audio:430KiB subtitle:0KiB
other streams:0KiB global headers:0KiB muxing overhead: 0.058467%
size= 21484KiB time=00:00:03.09 bitrate=56870.0kbits/s speed=1.53x
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