[FFmpeg-trac] #7927(undetermined:new): Video copy from mkv to mp4 causes variable frame rate from constant frame rate
FFmpeg
trac at avcodec.org
Mon May 27 16:54:10 EEST 2019
#7927: Video copy from mkv to mp4 causes variable frame rate from constant frame
rate
-------------------------------------+-------------------------------------
Reporter: madsfoto | Type: defect
Status: new | Priority: normal
Component: | Version: git-
undetermined | master
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
I am trying to convert from MKV to MP4 or MOV with a constant frame rate
and the resulting file has a variable frame rate.
In running ffmpeg -i FILE.mkv -c:v copy FILE.mp4, I expect a pure
container switch, and that the frame rate to stay exactly the same. The
reverse (mp4 to mkv) causes ''no'' frame rate change.
In mediainfo for source:
Frame rate mode : Constant
Frame rate : 29.970 (30000/1001) FPS
In mediainfo for destination:
Frame rate mode : Variable
Frame rate : 31.946 FPS
Minimum frame rate : 27.778 FPS
Maximum frame rate : 16 000.000 FPS
Original frame rate : 29.970 (30000/1001) FPS
The command I use is: ffmpeg.exe -i
Convert_to_mp4_ConstantFramerate_to_VariableFramerate.mkv -c:v copy -an
Convert_to_mp4_ConstantFramerate_to_VariableFramerate.mp4
I have a 2.63 MB mkv file for reproduction available, output of video copy
is as below:
ffmpeg -v 9 -loglevel 99 -i
Convert_to_mp4_ConstantFramerate_to_VariableFramerate.mkv -c:v copy -an
Convert_to_mp4_ConstantFramerate_to_VariableFramerate.mp4
ffmpeg version N-93913-g1a74b04737 Copyright (c) 2000-2019 the FFmpeg
developers
built with gcc 8.3.0 (Rev2, Built by MSYS2 project)
configuration: --disable-autodetect --enable-amf --enable-bzlib
--enable-cuda --enable-cuvid --enable-d3d11va --enable-dxva2 --enable-
iconv --enable-lzma --enable-nvenc --enable-zlib --enable-sdl2 --disable-
debug --enable-ffnvcodec --enable-nvdec --enable-libmp3lame --enable-
libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-
libx265 --enable-libdav1d --enable-fontconfig --enable-libass --enable-
libbluray --enable-libfreetype --enable-libmfx --enable-libmysofa
--enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg
--enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora
--enable-libtwolame --enable-libvidstab --enable-libvo-amrwbenc --enable-
libwavpack --enable-libwebp --enable-libxml2 --enable-libzimg --enable-
libshine --enable-gpl --enable-avisynth --enable-libxvid --enable-libaom
--enable-libopenmpt --enable-version3 --enable-mbedtls --extra-
cflags=-DLIBTWOLAME_STATIC --extra-libs=-lstdc++ --extra-
cflags=-DLIBXML_STATIC --extra-libs=-liconv
libavutil 56. 28.100 / 56. 28.100
libavcodec 58. 52.102 / 58. 52.102
libavformat 58. 27.103 / 58. 27.103
libavdevice 58. 7.100 / 58. 7.100
libavfilter 7. 54.101 / 7. 54.101
libswscale 5. 4.101 / 5. 4.101
libswresample 3. 4.100 / 3. 4.100
libpostproc 55. 4.100 / 55. 4.100
Splitting the commandline.
Reading option '-v' ... matched as option 'v' (set logging level) with
argument '9'.
Reading option '-loglevel' ... matched as option 'loglevel' (set logging
level) with argument '99'.
Reading option '-i' ... matched as input url with argument
'Convert_to_mp4_ConstantFramerate_to_VariableFramerate.mkv'.
Reading option '-c:v' ... matched as option 'c' (codec name) with argument
'copy'.
Reading option '-an' ... matched as option 'an' (disable audio) with
argument '1'.
Reading option 'Convert_to_mp4_ConstantFramerate_to_VariableFramerate.mp4'
... matched as output url.
Finished splitting the commandline.
Parsing a group of options: global .
Applying option v (set logging level) with argument 9.
Successfully parsed a group of options.
Parsing a group of options: input url
Convert_to_mp4_ConstantFramerate_to_VariableFramerate.mkv.
Successfully parsed a group of options.
Opening an input file:
Convert_to_mp4_ConstantFramerate_to_VariableFramerate.mkv.
[NULL @ 000001dd98e32b40] Opening
'Convert_to_mp4_ConstantFramerate_to_VariableFramerate.mkv' for reading
[file @ 000001dd98e33c40] Setting default whitelist 'file,crypto'
Probing matroska,webm score:100 size:2048
[matroska,webm @ 000001dd98e32b40] Format matroska,webm probed with
size=2048 and score=100
st:0 removing common factor 1000000 from timebase
st:1 removing common factor 1000000 from timebase
[matroska,webm @ 000001dd98e32b40] Before avformat_find_stream_info() pos:
4934 bytes read:32768 seeks:0 nb_streams:2
[h264 @ 000001dd98e36800] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 000001dd98e36800] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 000001dd98e36800] nal_unit_type: 7(SPS), nal_ref_idc: 3
[h264 @ 000001dd98e36800] nal_unit_type: 8(PPS), nal_ref_idc: 3
[h264 @ 000001dd98e36800] nal_unit_type: 9(AUD), nal_ref_idc: 0
[h264 @ 000001dd98e36800] nal_unit_type: 5(IDR), nal_ref_idc: 3
[h264 @ 000001dd98e36800] Format yuvj420p chosen by get_format().
[h264 @ 000001dd98e36800] Reinit context to 1920x1088, pix_fmt: yuvj420p
[h264 @ 000001dd98e36800] nal_unit_type: 9(AUD), nal_ref_idc: 0
[h264 @ 000001dd98e36800] nal_unit_type: 1(Coded slice of a non-IDR
picture), nal_ref_idc: 0
[h264 @ 000001dd98e36800] no picture ooo
[h264 @ 000001dd98e36800] nal_unit_type: 9(AUD), nal_ref_idc: 0
[h264 @ 000001dd98e36800] nal_unit_type: 1(Coded slice of a non-IDR
picture), nal_ref_idc: 0
[h264 @ 000001dd98e36800] no picture ooo
[h264 @ 000001dd98e36800] nal_unit_type: 9(AUD), nal_ref_idc: 0
[h264 @ 000001dd98e36800] nal_unit_type: 1(Coded slice of a non-IDR
picture), nal_ref_idc: 2
[h264 @ 000001dd98e36800] no picture
[h264 @ 000001dd98e36800] nal_unit_type: 9(AUD), nal_ref_idc: 0
[h264 @ 000001dd98e36800] nal_unit_type: 1(Coded slice of a non-IDR
picture), nal_ref_idc: 0
[h264 @ 000001dd98e36800] nal_unit_type: 9(AUD), nal_ref_idc: 0
[h264 @ 000001dd98e36800] nal_unit_type: 1(Coded slice of a non-IDR
picture), nal_ref_idc: 0
[h264 @ 000001dd98e36800] nal_unit_type: 9(AUD), nal_ref_idc: 0
[h264 @ 000001dd98e36800] nal_unit_type: 1(Coded slice of a non-IDR
picture), nal_ref_idc: 2
[h264 @ 000001dd98e36800] nal_unit_type: 9(AUD), nal_ref_idc: 0
[h264 @ 000001dd98e36800] nal_unit_type: 1(Coded slice of a non-IDR
picture), nal_ref_idc: 0
[h264 @ 000001dd98e36800] nal_unit_type: 9(AUD), nal_ref_idc: 0
[h264 @ 000001dd98e36800] nal_unit_type: 1(Coded slice of a non-IDR
picture), nal_ref_idc: 0
[h264 @ 000001dd98e36800] nal_unit_type: 9(AUD), nal_ref_idc: 0
[h264 @ 000001dd98e36800] nal_unit_type: 1(Coded slice of a non-IDR
picture), nal_ref_idc: 2
[matroska,webm @ 000001dd98e32b40] All info found
[matroska,webm @ 000001dd98e32b40] stream 0: start_time: 0.067 duration:
-9223372036854776.000
[matroska,webm @ 000001dd98e32b40] stream 1: start_time: 0.000 duration:
-9223372036854776.000
[matroska,webm @ 000001dd98e32b40] format: start_time: 0.000 duration:
1.104 bitrate=20018 kb/s
[matroska,webm @ 000001dd98e32b40] After avformat_find_stream_info() pos:
1040235 bytes read:1057837 seeks:0 frames:28
Input #0, matroska,webm, from
'Convert_to_mp4_ConstantFramerate_to_VariableFramerate.mkv':
Metadata:
COMPATIBLE_BRANDS: qt niko
MAJOR_BRAND : qt
MINOR_VERSION : 537331968
ENCODER : Lavf58.27.103
Duration: 00:00:01.10, start: 0.000000, bitrate: 20018 kb/s
Stream #0:0(eng), 11, 1/1000: Video: h264 (High), 1 reference frame,
yuvj420p(pc, smpte170m/bt709/bt470m, progressive, left), 1920x1080
(1920x1088), 0/1, 29.97 fps, 29.97 tbr, 1k tbn, 59.94 tbc (default)
Metadata:
DURATION : 00:00:01.104000000
Stream #0:1(eng), 17, 1/1000: Audio: vorbis, 48000 Hz, stereo, fltp
(default)
Metadata:
ENCODER : Lavc58.52.102 libvorbis
DURATION : 00:00:01.003000000
Successfully opened the file.
Parsing a group of options: output url
Convert_to_mp4_ConstantFramerate_to_VariableFramerate.mp4.
Applying option c:v (codec name) with argument copy.
Applying option an (disable audio) with argument 1.
Successfully parsed a group of options.
Opening an output file:
Convert_to_mp4_ConstantFramerate_to_VariableFramerate.mp4.
[file @ 000001dd99b6b040] Setting default whitelist 'file,crypto'
Successfully opened the file.
Output #0, mp4, to
'Convert_to_mp4_ConstantFramerate_to_VariableFramerate.mp4':
Metadata:
COMPATIBLE_BRANDS: qt niko
MAJOR_BRAND : qt
MINOR_VERSION : 537331968
encoder : Lavf58.27.103
Stream #0:0(eng), 0, 1/16000: Video: h264 (High), 1 reference frame
(avc1 / 0x31637661), yuvj420p(pc, smpte170m/bt709/bt470m, progressive,
left), 1920x1080 (0x0), 0/1, q=2-31, 29.97 fps, 29.97 tbr, 16k tbn, 1k tbc
(default)
Metadata:
DURATION : 00:00:01.104000000
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
cur_dts is invalid st:0 (0) [init:1 i_done:0 finish:0] (this is harmless
if it occurs once at the start per stream)
[mp4 @ 000001dd98f72880] Non-monotonous DTS in output stream 0:0;
previous: 538, current: 48; changing to 539. This may result in incorrect
timestamps in the output file.
[matroska,webm @ 000001dd98e32b40] Element at 0x2a26fb ending at 0x2a2739
exceeds containing master element ending at 0x2a26f6
No more output streams to write to, finishing.
frame= 31 fps=0.0 q=-1.0 Lsize= 2680kB time=00:00:00.97
bitrate=22608.3kbits/s speed=13.6x
video:2679kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB
muxing overhead: 0.049911%
Input file #0 (Convert_to_mp4_ConstantFramerate_to_VariableFramerate.mkv):
Input stream #0:0 (video): 31 packets read (2742890 bytes);
Input stream #0:1 (audio): 17 packets read (4456 bytes);
Total: 48 packets (2747346 bytes) demuxed
Output file #0
(Convert_to_mp4_ConstantFramerate_to_VariableFramerate.mp4):
Output stream #0:0 (video): 31 packets muxed (2742890 bytes);
Total: 31 packets (2742890 bytes) muxed
0 frames successfully decoded, 0 decoding errors
[AVIOContext @ 000001dd9911e980] Statistics: 2 seeks, 14 writeouts
[AVIOContext @ 000001dd98e3bec0] Statistics: 2762553 bytes read, 0 seeks
--
Ticket URL: <https://trac.ffmpeg.org/ticket/7927>
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