#8464 closed defect (invalid)
`outpoint` directive of `concat` demuxer may be off by 1 frame
| Reported by: | gdgsdg123 | Owned by: | |
|---|---|---|---|
| Priority: | normal | Component: | avformat |
| Version: | git-master | Keywords: | concat |
| Cc: | Blocked By: | ||
| Blocking: | Reproduced by developer: | no | |
| Analyzed by developer: | no |
Description
X.txt:
file 'merge.avi' inpoint 87.05 outpoint 88.116667
ffmpeg -y -f concat -safe 0 -i "X.txt" -c copy "temp.avi"
ffmpeg version git-2020-01-02-81172b5 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 9.2.1 (GCC) 20191125
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
libavutil 56. 38.100 / 56. 38.100
libavcodec 58. 65.102 / 58. 65.102
libavformat 58. 35.101 / 58. 35.101
libavdevice 58. 9.102 / 58. 9.102
libavfilter 7. 70.101 / 7. 70.101
libswscale 5. 6.100 / 5. 6.100
libswresample 3. 6.100 / 3. 6.100
libpostproc 55. 6.100 / 55. 6.100
[avi @ 00000000003ca900] decoding for stream 0 failed
Input #0, concat, from 'X.txt':
Duration: 00:00:01.07, bitrate: 0 kb/s
Stream #0:0: Video: h264 (High 4:4:4 Intra) (H264 / 0x34363248), gbrp(tv, gbr/unknown/unknown, progressive), 1920x1080, 377584 kb/s, 60 fps, 30 tbr, 60 tbn, 120 tbc
Output #0, avi, to 'temp.avi':
Metadata:
ISFT : Lavf58.35.101
Stream #0:0: Video: h264 (High 4:4:4 Intra) (H264 / 0x34363248), gbrp(tv, gbr/unknown/unknown, progressive), 1920x1080, q=2-31, 377584 kb/s, 60 fps, 30 tbr, 60 tbn, 60 tbc
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[avi @ 00000000003cf100] Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
frame= 33 fps=0.0 q=-1.0 Lsize= 96767kB time=00:00:01.08 bitrate=731740.7kbits/s speed=8.74x
video:96760kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.007367%
The frame at outpoint is included, while according to the documentation it shouldn't... And the behavior is inconsistent with different timestamp values.
ffmpeg -ss 87.05 -to 88.116667 -i "merge.avi" -an -c copy "to.avi"
ffmpeg version git-2020-01-02-81172b5 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 9.2.1 (GCC) 20191125
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
libavutil 56. 38.100 / 56. 38.100
libavcodec 58. 65.102 / 58. 65.102
libavformat 58. 35.101 / 58. 35.101
libavdevice 58. 9.102 / 58. 9.102
libavfilter 7. 70.101 / 7. 70.101
libswscale 5. 6.100 / 5. 6.100
libswresample 3. 6.100 / 3. 6.100
libpostproc 55. 6.100 / 55. 6.100
[avi @ 00000000006504c0] decoding for stream 0 failed
Input #0, avi, from 'merge.avi':
Metadata:
encoder : Lavf58.29.100
Duration: 00:05:24.67, start: 0.000000, bitrate: 377573 kb/s
Stream #0:0: Video: h264 (High 4:4:4 Intra) (H264 / 0x34363248), gbrp(tv, gbr/unknown/unknown, progressive), 1920x1080, 377584 kb/s, 60 fps, 30 tbr, 60 tbn, 120 tbc
Output #0, avi, to 'to.avi':
Metadata:
ISFT : Lavf58.35.101
Stream #0:0: Video: h264 (High 4:4:4 Intra) (H264 / 0x34363248), gbrp(tv, gbr/unknown/unknown, progressive), 1920x1080, q=2-31, 377584 kb/s, 60 fps, 30 tbr, 60 tbn, 60 tbc
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
[avi @ 000000000315c900] Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
frame= 32 fps=0.0 q=-1.0 Lsize= 93969kB time=00:00:01.05 bitrate=733139.1kbits/s speed=9.13x
video:93962kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.007536%
This approach seemed to produce a reliable output with various -to values tried. (not intensively tested)
For obvious reason I'm not gonna upload the "merge.avi"... But I believe the problem can be reproduced with different input and timestamp values.
Attachments (1)
Change History (7)
comment:1 by , 5 years ago
| Component: | undetermined → avformat |
|---|---|
| Keywords: | concat added |
| Resolution: | → needs_more_info |
| Status: | new → closed |
by , 5 years ago
Modified "merge.avi" that can be used to reproduce the problem. (with the original commands)
comment:2 by , 5 years ago
| Resolution: | needs_more_info |
|---|---|
| Status: | closed → reopened |
Seems only the timestamps matter...
follow-up: 4 comment:3 by , 5 years ago
| Resolution: | → invalid |
|---|---|
| Status: | reopened → closed |
This is a simple timestamp precision issue. Input file is 60 fps, therefore the timestamp of the last frame is *exactly* 5287/60 which is 88.116666666666 (infinite number of sixes), which is indeed smaller then the outpoint you specified 88.116667 therefore the last frame is included. I suggest you round downwards when you specify the outpoint if you dont want to include the frame at outpoint.
comment:4 by , 5 years ago
| Type: | defect → enhancement |
|---|
Replying to cus:
This is a simple timestamp precision issue. Input file is 60 fps, therefore the timestamp of the last frame is *exactly* 5287/60 which is 88.116666666666 (infinite number of sixes), which is indeed smaller then the outpoint you specified 88.116667 therefore the last frame is included.
Maybe invalid but it doesn't answer the real question...
As those are values reported by FFprobe.
ffprobe -hide_banner -show_entries "frame" -select_streams v:0 -of "xml" "temp.avi"ffprobe -hide_banner -show_entries "frame=best_effort_timestamp_time" -select_streams v:0 -of "compact=nk=1:p=0" "temp.avi"
Replying to cus:
I suggest you round downwards when you specify the outpoint if you dont want to include the frame at outpoint.
This approach seemed to produce a reliable output with various outpoint values tried. (not intensively tested)
comment:5 by , 5 years ago
| Resolution: | invalid → worksforme |
|---|
The "merge.avi" also serves as a good example for testing the cutting accuracy.
The file is entirely composed of "Black Screen" frames with only 3 exceptions:
| Frame Number | Presentation Timestamp | Duration | Content |
|---|---|---|---|
| 564 | 87.05 | 0.033333 | Yellow |
| 595 | 88.083333 | 0.033334 | Green |
| 596 | 88.116667 | N/A | Red |
Which resemble all 3 possible outcomes: on point, early, late.
Another thing: possible 0 frame output (null segment) without warning...
X.txt:
file 'merge.avi' inpoint 87.05 outpoint 87.05
ffmpeg -y -f concat -safe 0 -i "X.txt" -c copy "temp.avi"
ffmpeg version git-2020-01-10-3d894db Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 9.2.1 (GCC) 20191125
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
libavutil 56. 38.100 / 56. 38.100
libavcodec 58. 65.103 / 58. 65.103
libavformat 58. 35.101 / 58. 35.101
libavdevice 58. 9.103 / 58. 9.103
libavfilter 7. 70.101 / 7. 70.101
libswscale 5. 6.100 / 5. 6.100
libswresample 3. 6.100 / 3. 6.100
libpostproc 55. 6.100 / 55. 6.100
Input #0, concat, from 'X.txt':
Duration: 00:00:00.00, bitrate: N/A
Stream #0:0: Video: h264 (High 4:4:4 Intra) (H264 / 0x34363248), gbrp(tv, gbr/unknown/unknown, progressive), 256x144, 60 fps, 30 tbr, 60 tbn, 60 tbc
Output #0, avi, to 'temp.avi':
Metadata:
ISFT : Lavf58.35.101
Stream #0:0: Video: h264 (High 4:4:4 Intra) (H264 / 0x34363248), gbrp(tv, gbr/unknown/unknown, progressive), 256x144, q=2-31, 60 fps, 30 tbr, 60 tbn, 60 tbc
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Press [q] to stop, [?] for help
frame= 0 fps=0.0 q=-1.0 Lsize= 6kB time=00:00:00.00 bitrate=N/A speed= 0x
video:0kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
ffmpeg -ss 87.05 -to 87.05 -i "merge.avi" -an -c copy "to.avi"
ffmpeg version git-2020-01-10-3d894db Copyright (c) 2000-2020 the FFmpeg developers built with gcc 9.2.1 (GCC) 20191125 configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf libavutil 56. 38.100 / 56. 38.100 libavcodec 58. 65.103 / 58. 65.103 libavformat 58. 35.101 / 58. 35.101 libavdevice 58. 9.103 / 58. 9.103 libavfilter 7. 70.101 / 7. 70.101 libswscale 5. 6.100 / 5. 6.100 libswresample 3. 6.100 / 3. 6.100 libpostproc 55. 6.100 / 55. 6.100 -to value smaller than -ss; aborting.
The inpoint/-ss, outpoint/-to values must be carefully chosen.
Off-Topic
When using concat demuxer, explicitly specifying duration is usually necessary.
And is it yet possible to instruct FFmpeg to report the number of frames of each segment?
comment:6 by , 5 years ago
| Resolution: | worksforme → invalid |
|---|---|
| Type: | enhancement → defect |
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