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Les autorisations surchargées par les plugins

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Mediaspip core
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Sur d’autres sites (9861)

FFmpeg - Concat videos with different time base [duplicate]

3 mai 2019, par Xys

This question already has an answer here :

ffmpeg - Join two movies with different timebase

3 answers

I’m trying to concat videos with the concat demuxer, but it does not work when using one video ("video2.mp4" below). By does not work, I mean playing the concatenated video on a player will work until the second video part starts (it just cannot read the video anymore). It works with the concat filter though. They are both mp4 videos, so I think it’s because of the time base ? I can concat other videos with the concat demuxer and it works fine (even with different resolutions/bitrate). It only happens when trying to concat "video2.mp4".

Also, I have a lot of warning/errors like this, probably when ffmpeg starts concatenating the 2nd video :

[mp4 @ 0x7f847a814800] Non-monotonous DTS in output stream 0:0; previous: 906906, current: 302359; changing to 906907. This may result in incorrect timestamps in the output file.

What would be the best way to have a minimum concat time ? Do I really need to use the concat filter or can I change the time base of "video1.mp4" if it’s really the problem ?

Any help would be appreciated, thanks !

Video 1 :

ffprobe version 3.2.2 Copyright (c) 2007-2016 the FFmpeg developers

  built with Apple LLVM version 8.0.0 (clang-800.0.42.1)

  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda

  libavutil      55. 34.100 / 55. 34.100

  libavcodec     57. 64.101 / 57. 64.101

  libavformat    57. 56.100 / 57. 56.100

  libavdevice    57.  1.100 / 57.  1.100

  libavfilter     6. 65.100 /  6. 65.100

  libavresample   3.  1.  0 /  3.  1.  0

  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 'video1.mp4':

  Metadata:

    major_brand     : mp42

    minor_version   : 0

    compatible_brands: isommp42

    creation_time   : 2016-08-17T22:50:35.000000Z

  Duration: 00:00:10.11, start: 0.000000, bitrate: 38018 kb/s

    Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 1696x848, 37832 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 180k tbc (default)

    Metadata:

      creation_time   : 2016-08-18T00:02:24.000000Z

      handler_name    : VideoHandle

    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s (default)

    Metadata:

      creation_time   : 2016-08-18T00:02:24.000000Z

      handler_name    : SoundHandle

Video 2 :

ffprobe version 3.2.2 Copyright (c) 2007-2016 the FFmpeg developers

  built with Apple LLVM version 8.0.0 (clang-800.0.42.1)

  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda

  libavutil      55. 34.100 / 55. 34.100

  libavcodec     57. 64.101 / 57. 64.101

  libavformat    57. 56.100 / 57. 56.100

  libavdevice    57.  1.100 / 57.  1.100

  libavfilter     6. 65.100 /  6. 65.100

  libavresample   3.  1.  0 /  3.  1.  0

  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 'video2.mp4':

  Metadata:

    major_brand     : mp42

    minor_version   : 0

    compatible_brands: mp42mp41

    creation_time   : 2017-01-06T22:30:23.000000Z

  Duration: 00:00:08.19, start: 0.000000, bitrate: 101474 kb/s

    Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 4096x2048 [SAR 1:1 DAR 2:1], 101549 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)

    Metadata:

      creation_time   : 2017-01-06T22:30:23.000000Z

      handler_name    : ?Mainconcept Video Media Handler

      encoder         : AVC Coding

    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 125 kb/s (default)

    Metadata:

      creation_time   : 2017-01-06T22:30:23.000000Z

      handler_name    : #Mainconcept MP4 Sound Media Handler

FFMpeg Command :

ffmpeg -f concat -safe 0 -i concat.txt -c copy result.mp4

concat.txt :

file '/path/to/video1.mp4'

file '/path/to/video2.mp4'

Command result :

ffmpeg version 3.2.2 Copyright (c) 2000-2016 the FFmpeg developers

  built with Apple LLVM version 8.0.0 (clang-800.0.42.1)

  configuration: --prefix=/usr/local/Cellar/ffmpeg/3.2.2 --enable-shared --enable-pthreads --enable-gpl --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --enable-libmp3lame --enable-libx264 --enable-libxvid --enable-opencl --disable-lzma --enable-vda

  libavutil      55. 34.100 / 55. 34.100

  libavcodec     57. 64.101 / 57. 64.101

  libavformat    57. 56.100 / 57. 56.100

  libavdevice    57.  1.100 / 57.  1.100

  libavfilter     6. 65.100 /  6. 65.100

  libavresample   3.  1.  0 /  3.  1.  0

  libswscale      4.  2.100 /  4.  2.100

  libswresample   2.  3.100 /  2.  3.100

  libpostproc    54.  1.100 / 54.  1.100

[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fbd8b808c00] Auto-inserting h264_mp4toannexb bitstream filter

Input #0, concat, from 'concat.txt':

  Duration: N/A, start: 0.000000, bitrate: 38021 kb/s

    Stream #0:0(eng): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 1696x848, 37832 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 180k tbc

    Metadata:

      creation_time   : 2016-08-18T00:02:24.000000Z

      handler_name    : VideoHandle

    Stream #0:1(eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 189 kb/s

    Metadata:

      creation_time   : 2016-08-18T00:02:24.000000Z

      handler_name    : SoundHandle

Output #0, mp4, to 'result.mp4':

  Metadata:

    encoder         : Lavf57.56.100

    Stream #0:0(eng): Video: h264 (Baseline) ([33][0][0][0] / 0x0021), yuv420p, 1696x848, q=2-31, 37832 kb/s, 29.97 fps, 29.97 tbr, 90k tbn, 90k tbc

    Metadata:

      creation_time   : 2016-08-18T00:02:24.000000Z

      handler_name    : VideoHandle

    Stream #0:1(eng): Audio: aac (LC) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, 189 kb/s

    Metadata:

      creation_time   : 2016-08-18T00:02:24.000000Z

      handler_name    : SoundHandle

Stream mapping:

  Stream #0:0 -> #0:0 (copy)

  Stream #0:1 -> #0:1 (copy) 

Press [q] to stop, [?] for help

frame=  112 fps=0.0 q=-1.0 size=   12701kB time=00:00:03.70 bitrate=28092.2kbits/s speed= 7.4x

frame=  151 fps=151 q=-1.0 size=   18853kB time=00:00:05.00 bitrate=30857.5kbits/s speed=   5x

frame=  224 fps=149 q=-1.0 size=   30042kB time=00:00:07.44 bitrate=33074.8kbits/s speed=4.95x

frame=  268 fps=134 q=-1.0 size=   36596kB time=00:00:08.90 bitrate=33650.8kbits/s speed=4.44x

[mov,mp4,m4a,3gp,3g2,mj2 @ 0x7fbd8a808000] Auto-inserting h264_mp4toannexb bitstream filter.9x 

[mp4 @ 0xb545d000] Non-monotonous DTS in output stream 0:1; previous: 484352, current: 445939; changing to 484353. This may result in incorrect timestamps in the output file.

[concat @ 0xb545c400] DTS 304057 &lt; 906906 out of order

[mp4 @ 0xb545d000] Non-monotonous DTS in output stream 0:0; previous: 906906, current: 304057; changing to 906907. This may result in incorrect timestamps in the output file.

[mp4 @ 0xb545d000] Non-monotonous DTS in output stream 0:1; previous: 484353, current: 446963; changing to 484354. This may result in incorrect timestamps in the output file.

...

... like 100 DTS errors ...

...

[mp4 @ 0xb545d000] Non-monotonous DTS in output stream 0:0; previous: 907150, current: 548301; changing to 907151. This may result in incorrect timestamps in the output file.

frame=  548 fps=169 q=-1.0 Lsize=  148399kB time=00:00:18.28 bitrate=66493.7kbits/s speed=5.64x

video:148027kB audio:359kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.008622%

Thank you in advance !

QuTip Example 'bloch-sphere-animation' - video renders blank

15 juillet 2018, par damien murphy.
On MacOSX Using Python3 running the following example code provided without modification : https://github.com/qutip/qutip-notebooks/blob/master/examples/bloch-sphere-animation.ipynb

I get a blank video and no errors.

I have installed libav and ffmpeg so I am not sure what else is missing with any error.

What codec did you install on mac when running these samples ?

Looking at the source of qutip I can see what it is using to render the video : https://github.com/qutip/qutip/blob/master/qutip/ipynbtools.py#L392
```
anim.save(name + '.mp4', fps=10, writer="avconv", codec="libx264")
```
I have avconv on the command line working without errors

This is the debug outout of matploylib.animation

INFO:matplotlib.animation:Animation.save using DEBUG:matplotlib.animation:frame
size in pixels is 576 x 576 INFO:matplotlib.animation:MovieWriter.run :
running command : [’avconv’, ’-f’, ’rawvideo’, ’-vcodec’, ’rawvideo’,
’-s’, ’576x576’, ’-pix_fmt’, ’rgba’, ’-r’, ’10’, ’-i’, ’pipe :’,
’-vcodec’, ’libx264’, ’-y’, ’movie.mp4’]
DEBUG:matplotlib.animation:MovieWriter.grab_frame : Grabbing frame.
DEBUG:matplotlib.animation:MovieWriter.grab_frame : Grabbing frame.
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DEBUG:matplotlib.animation:MovieWriter — Command stdout : b’’
DEBUG:matplotlib.animation:MovieWriter — Command stderr : b"avconv
version 12.3, Copyright (c) 2000-2018 the Libav developers\n built on
Feb 13 2018 11:17:07 with Apple LLVM version 9.0.0
(clang-900.0.39.2)\n[rawvideo @ 0x7f963c000000] Estimating duration
from bitrate, this may be inaccurate\nInput #0, rawvideo, from
’pipe :’ :\n Duration : N/A, start : 0.000000, bitrate : N/A\n Stream

0:0 : Video : rawvideo\n rgba, 576x576\n 10 fps, 10 tbn\nStream mapping :\n Stream #0:0 -> #0:0 (rawvideo (native) -> h264

(libx264))\nPress ctrl-c to stop encoding\n[libx264 @ 0x7f963e001800]
using cpu capabilities : MMX2 SSE2Fast SSSE3 SSE4.2 AVX\n[libx264 @
0x7f963e001800] profile High, level 2.2\n[libx264 @ 0x7f963e001800]
264 - core 152 r2854 e9a5903 - H.264/MPEG-4 AVC codec - Copyleft
2003-2017 - http://www.videolan.org/x264.html - options : cabac=1 ref=3
deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00
mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0
deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12
lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0
bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1
b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250
keyint_min=10 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf
mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40
aq=1:1.00\nOutput #0, mp4, to ’movie.mp4’ :\n Metadata :\n encoder
: Lavf57.7.2\n Stream #0:0 : Video : h264 [[33][0][0][0] / 0x0021]\n
yuv420p, 576x576, q=2-31\n 10 fps, 10 tbn\n Metadata :\n
encoder : Lavc57.25.0 libx264\n Side data :\n cpb :
bitrate max/min/avg : 0/0/0 buffer size : 0 vbv_delay : -1\nframe= 6
fps= 0 q=0.0 size= 0kB time=10000000000.00 bitrate=
0.0kbits/s \rframe= 10 fps= 8 q=0.0 size= 0kB time=10000000000.00 bitrate= 0.0kbits/s \rframe= 13 fps= 7
q=0.0 size= 0kB time=10000000000.00 bitrate= 0.0kbits/s
\rframe= 16 fps= 7 q=0.0 size= 0kB time=10000000000.00
bitrate= 0.0kbits/s \rframe= 19 fps= 6 q=0.0 size= 0kB
time=10000000000.00 bitrate= 0.0kbits/s \rframe= 22 fps= 6
q=0.0 size= 0kB time=10000000000.00 bitrate= 0.0kbits/s
\rframe= 26 fps= 6 q=0.0 size= 0kB time=10000000000.00
bitrate= 0.0kbits/s \rframe= 30 fps= 6 q=0.0 size= 0kB
time=10000000000.00 bitrate= 0.0kbits/s \rframe= 33 fps= 6
q=0.0 size= 0kB time=10000000000.00 bitrate= 0.0kbits/s
\rframe= 36 fps= 6 q=0.0 size= 0kB time=10000000000.00
bitrate= 0.0kbits/s \rframe= 39 fps= 6 q=0.0 size= 0kB
time=10000000000.00 bitrate= 0.0kbits/s \rframe= 42 fps= 6
q=0.0 size= 0kB time=10000000000.00 bitrate= 0.0kbits/s
\rframe= 45 fps= 6 q=0.0 size= 0kB time=10000000000.00
bitrate= 0.0kbits/s \rframe= 48 fps= 6 q=0.0 size= 0kB
time=10000000000.00 bitrate= 0.0kbits/s \rframe= 51 fps= 6
q=0.0 size= 0kB time=10000000000.00 bitrate= 0.0kbits/s
\rframe= 55 fps= 6 q=0.0 size= 0kB time=10000000000.00
bitrate= 0.0kbits/s \rframe= 59 fps= 6 q=25.0 size= 1kB
time=10000000000.00 bitrate= 0.0kbits/s \rframe= 63 fps= 6
q=25.0 size= 1kB time=0.40 bitrate= 19.8kbits/s \rframe=
67 fps= 6 q=25.0 size= 1kB time=0.80 bitrate= 10.9kbits/s
\rframe= 71 fps= 6 q=25.0 size= 1kB time=1.20 bitrate=
7.9kbits/s \rframe= 75 fps= 6 q=25.0 size= 1kB time=1.60 bitrate= 6.4kbits/s \rframe= 79 fps= 6 q=25.0 size= 1kB
time=2.00 bitrate= 5.5kbits/s \rframe= 82 fps= 6 q=25.0 size=
1kB time=2.30 bitrate= 5.0kbits/s \rframe= 86 fps= 6 q=25.0
size= 2kB time=2.70 bitrate= 4.6kbits/s \rframe= 90 fps=
6 q=25.0 size= 2kB time=3.10 bitrate= 4.2kbits/s \rframe=
93 fps= 6 q=25.0 size= 2kB time=3.40 bitrate= 4.0kbits/s
\rframe= 97 fps= 6 q=25.0 size= 2kB time=3.80 bitrate=
3.8kbits/s \rframe= 101 fps= 6 q=25.0 size= 2kB time=4.20 bitrate= 3.6kbits/s \rframe= 105 fps= 6 q=25.0 size= 2kB
time=4.60 bitrate= 3.4kbits/s \rframe= 109 fps= 6 q=25.0 size=
2kB time=5.00 bitrate= 3.3kbits/s \rframe= 112 fps= 6 q=25.0
size= 2kB time=5.30 bitrate= 3.2kbits/s \rframe= 116 fps=
6 q=25.0 size= 2kB time=5.70 bitrate= 3.2kbits/s \rframe=
120 fps= 6 q=25.0 size= 2kB time=6.10 bitrate= 3.1kbits/s
\rframe= 123 fps= 6 q=25.0 size= 2kB time=6.40 bitrate=
3.0kbits/s \rframe= 126 fps= 6 q=25.0 size= 2kB time=6.70 bitrate= 3.0kbits/s \rframe= 129 fps= 6 q=25.0 size= 2kB
time=7.00 bitrate= 2.9kbits/s \rframe= 132 fps= 6 q=25.0 size=
3kB time=7.30 bitrate= 2.9kbits/s \rframe= 135 fps= 6 q=25.0
size= 3kB time=7.60 bitrate= 2.8kbits/s \rframe= 138 fps=
6 q=25.0 size= 3kB time=7.90 bitrate= 2.8kbits/s \rframe=
141 fps= 6 q=25.0 size= 3kB time=8.20 bitrate= 2.8kbits/s
\rframe= 144 fps= 6 q=25.0 size= 3kB time=8.50 bitrate=
2.7kbits/s \rframe= 148 fps= 6 q=25.0 size= 3kB time=8.90 bitrate= 2.7kbits/s \rframe= 150 fps= 6 q=-1.0 Lsize= 7kB
time=14.70 bitrate= 4.1kbits/s \r\nvideo:4kB audio:0kB other
streams:0kB global headers:0kB muxing overhead : 74.948143%\n[libx264 @
0x7f963e001800] frame I:1 Avg QP : 6.00 size : 112\n[libx264 @
0x7f963e001800] frame P:38 Avg QP : 6.21 size : 30\n[libx264 @
0x7f963e001800] frame B:111 Avg QP : 9.67 size : 22\n[libx264 @
0x7f963e001800] consecutive B-frames : 1.3% 0.0% 0.0%
98.7%\n[libx264 @ 0x7f963e001800] mb I I16..4 : 100.0% 0.0% 0.0%\n[libx264 @ 0x7f963e001800] mb P I16..4 : 0.0% 0.0% 0.0% P16..4 : 0.0% 0.0% 0.0% 0.0% 0.0% skip:100.0%\n[libx264 @
0x7f963e001800] mb B I16..4 : 0.0% 0.0% 0.0% B16..8 : 0.0% 0.0%
0.0% direct : 0.0% skip:100.0%\n[libx264 @ 0x7f963e001800] 8x8 transform intra:0.0%\n[libx264 @ 0x7f963e001800] coded y,uvDC,uvAC
intra : 0.0% 0.0% 0.0% inter : 0.0% 0.0% 0.0%\n[libx264 @
0x7f963e001800] i16 v,h,dc,p : 97% 0% 3% 0%\n[libx264 @
0x7f963e001800] i8c dc,h,v,p : 100% 0% 0% 0%\n[libx264 @
0x7f963e001800] Weighted P-Frames : Y:0.0% UV:0.0%\n[libx264 @
0x7f963e001800] kb/s:1.95\n"
ffmpeg copy stream preserving FPS

10 mars 2017, par James Taylor
I have a stream that I know is outputting at a certain frame rate (30 FPS). I want to use ffmpeg to make a copy of this stream and save it to disk.

I have the following command :
```
ffmpeg -i http://input/ -c copy -map 0 \

    -f segment -strftime 1 -segment_time 900 \

    -segment_atclocktime 1 -segment_format mp4 %Y-%m-%d_%H-%M-%S.mp4
```
But when I run the command, I see the following :
```
frame=   32 fps=3.9 q=-1.0 Lsize=N/A time=00:00:01.27 bitrate=N/A
```
Where it appears the FPS is hovers around 4.0 FPS and time moves slower than real time.

I tried added -re (copy the rate of the input stream) and -r 30 (manually set the rate to 30 FPS) flag specified before the input file, but it didn’t seem to work.

I also read a similar question here using -framerate 30, but that option doesn’t exist in the man pages and is an Invalid option.

Any help would be greatly appreciated !

So I let the modified command (removing the flags -c copy -map 0) run for exactly 5 minutes. Running ffprobe yields :
```
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '2017-03-10_01-09-12.mp4':

  Metadata:

    major_brand     : isom

    minor_version   : 512

    compatible_brands: isomiso2avc1mp41

    encoder         : Lavf57.2.100

  Duration: 00:00:15.43, start: 0.066016, bitrate: 13416 kb/s

    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc), 1024x768, 13414 kb/s, 30 fps, 30 tbr, 15360 tbn, 60 tbc (default)

    Metadata:

      handler_name    : VideoHandler
```
Again, this only produces 15 seconds of video and I can’t seem to get a 1:1 relationship between the input stream of 30 FPS and an output stream also in 30 FPS in real time. Playing the video yields something that’s sped up.

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ffmpeg copy stream preserving FPS

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