[FFmpeg-user] shuffleframes -- unexpected results
Mark Filipak (ffmpeg)
markfilipak at bog.us
Mon Feb 22 05:38:32 EET 2021
On 2021-02-21 22:17, Mark Filipak (ffmpeg) wrote:
> On 2021-02-21 21:39, pdr0 wrote:
>> Mark Filipak (ffmpeg) wrote
>>> I've run some test cases for the shuffleframes filter. I've documented
>>> shuffleframes via my
>>> preferred documentation format (below). In the course of my testing, I
>>> found 2 cases (marked "*****
>>> Expected", below) that produced unexpected results, to wit: If the 1st
>>> frame is discarded, the
>>> entire input is discarded, even if the 1st discard is followed by frames
>>> that are supposed to be
>>> retained.
>>>
>>> -1 1 ...Blocks the pipeline (discards all frames). *****
>>> Expected 1 3 5 7 ..
>>> -1 1 2 ...Blocks the pipeline (discards all frames).
>>> ***** Expected 1 2 4 5 7 8 ..
>>
>> These 2 cases produce the expected result for me
>>
>> If the "entire input is discarded" - do you mean you get no output file at
>> all ?
>
> No output file at all. The transcodes complete (they don't hang awaiting end-of-stream) but since
> the pipeline contains no frames, the encoder makes nothing and ffmpeg makes no files.
>
>> Post more info, including the console log
>
> First, for context, the scripts:
> ffmpeg -i 0.mkv -vf shuffleframes="-1" -dn "\-1.mkv"
> ffmpeg -i 0.mkv -vf shuffleframes="-1 1" -dn "\-1 1.mkv"
> ffmpeg -i 0.mkv -vf shuffleframes="-1 1 2" -dn "\-1 1 2.mkv"
>
> I had to escape the '-' in the filenames in order to avoid this complaint:
> "Unrecognized option '1 1 2.mkv'.
> "Error splitting the argument list: Option not found"
>
> Perhaps it would be expeditious if you showed me your command line that works, eh?
Oh dear. Is there a escaping row between Windows and ffmpeg? Here's the logfile:
ffmpeg started on 2021-02-21 at 11:50:29
Report written to "ffmpeg-20210221-115029.log"
Log level: 32
Command line:
ffmpeg -i 0.mkv -vf "shuffleframes=-1 1 2" -dn "\\-1 1 2.mkv"
ffmpeg version N-100851-g9f38fac053 Copyright (c) 2000-2021 the FFmpeg developers
built with gcc 9.3-win32 (GCC) 20200320
configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config
--cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3
--disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-zlib --enable-libxml2
--enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig
--enable-opencl --enable-libvmaf --enable-vulkan --enable-libvorbis --enable-amf --enable-libaom
--enable-avisynth --enable-libdav1d --enable-libdavs2 --enable-ffnvcodec --enable-cuda-llvm
--enable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus
--enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb
--enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-librubberband
--enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libsvtav1
--enable-libtwolame --enable-libuavs3d --enable-libvidstab --enable-libx264 --enable-libx26
libavutil 56. 64.100 / 56. 64.100
libavcodec 58.119.100 / 58.119.100
libavformat 58. 65.101 / 58. 65.101
libavdevice 58. 11.103 / 58. 11.103
libavfilter 7.100.100 / 7.100.100
libswscale 5. 8.100 / 5. 8.100
libswresample 3. 8.100 / 3. 8.100
libpostproc 55. 8.100 / 55. 8.100
Input #0, matroska,webm, from '0.mkv':
Metadata:
ENCODER : Lavf58.65.101
Duration: 00:00:05.76, start: 0.000000, bitrate: 295 kb/s
Stream #0:0: Video: h264 (High), yuv420p(tv, smpte170m, progressive), 240x236 [SAR 32:27 DAR
640:531], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
Metadata:
ENCODER : Lavc58.119.100 libx264
DURATION : 00:00:05.756000000
Stream #0:1: Audio: vorbis, 48000 Hz, stereo, fltp (default)
Metadata:
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
BPS-eng : 80531
DURATION-eng : 00:00:05.736000000
NUMBER_OF_FRAMES-eng: 338
NUMBER_OF_BYTES-eng: 57741
_STATISTICS_WRITING_APP-eng: mkvmerge v51.0.0 ('I Wish') 64-bit
_STATISTICS_WRITING_DATE_UTC-eng: 2020-12-21 04:14:21
ENCODER : Lavc58.119.100 libvorbis
DURATION : 00:00:05.719000000
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
Stream #0:1 -> #0:1 (vorbis (native) -> vorbis (libvorbis))
Press [q] to stop, [?] for help
[libvorbis @ 000001b0c4130a80] Queue input is backward in time
[libx264 @ 000001b0c2399140] using SAR=32/27
[libx264 @ 000001b0c2399140] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
[libx264 @ 000001b0c2399140] profile High, level 1.2, 4:2:0, 8-bit
[libx264 @ 000001b0c2399140] 264 - core 161 - H.264/MPEG-4 AVC codec - Copyleft 2003-2020 -
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=7 lookahead_threads=1 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=23 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
Output #0, matroska, to '\-1 1 2.mkv':
Metadata:
encoder : Lavf58.65.101
Stream #0:0: Video: h264 (H264 / 0x34363248), yuv420p(tv, smpte170m, progressive), 240x236 [SAR
32:27 DAR 640:531], q=2-31, 23.98 fps, 1k tbn (default)
Metadata:
DURATION : 00:00:05.756000000
encoder : Lavc58.119.100 libx264
Side data:
cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
Stream #0:1: Audio: vorbis (oV[0][0] / 0x566F), 48000 Hz, stereo, fltp (default)
Metadata:
_STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES
BPS-eng : 80531
DURATION-eng : 00:00:05.736000000
NUMBER_OF_FRAMES-eng: 338
NUMBER_OF_BYTES-eng: 57741
_STATISTICS_WRITING_APP-eng: mkvmerge v51.0.0 ('I Wish') 64-bit
_STATISTICS_WRITING_DATE_UTC-eng: 2020-12-21 04:14:21
DURATION : 00:00:05.719000000
encoder : Lavc58.119.100 libvorbis
frame= 2 fps=0.0 q=0.0 size= 5kB time=00:00:00.36 bitrate= 114.0kbits/s speed=13.7x
[libvorbis @ 000001b0c4130a80] Queue input is backward in time
frame= 92 fps=0.0 q=-1.0 Lsize= 174kB time=00:00:05.70 bitrate= 250.0kbits/s speed=20.3x
video:112kB audio:55kB subtitle:0kB other streams:0kB global headers:4kB muxing overhead: 4.748137%
[libx264 @ 000001b0c2399140] frame I:1 Avg QP:21.36 size: 1139
[libx264 @ 000001b0c2399140] frame P:25 Avg QP:23.08 size: 2331
[libx264 @ 000001b0c2399140] frame B:66 Avg QP:27.39 size: 821
[libx264 @ 000001b0c2399140] consecutive B-frames: 2.2% 6.5% 0.0% 91.3%
[libx264 @ 000001b0c2399140] mb I I16..4: 17.8% 78.7% 3.6%
[libx264 @ 000001b0c2399140] mb P I16..4: 3.8% 19.1% 3.0% P16..4: 37.6% 21.5% 10.9% 0.0% 0.0%
skip: 4.2%
[libx264 @ 000001b0c2399140] mb B I16..4: 0.8% 2.5% 0.9% B16..8: 38.6% 8.0% 2.7% direct:
5.2% skip:41.4% L0:55.3% L1:35.3% BI: 9.5%
[libx264 @ 000001b0c2399140] 8x8 transform intra:70.4% inter:75.2%
[libx264 @ 000001b0c2399140] coded y,uvDC,uvAC intra: 53.9% 76.7% 21.0% inter: 19.8% 25.2% 2.1%
[libx264 @ 000001b0c2399140] i16 v,h,dc,p: 47% 12% 19% 22%
[libx264 @ 000001b0c2399140] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 35% 15% 18% 3% 5% 8% 5% 8% 4%
[libx264 @ 000001b0c2399140] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 28% 21% 14% 6% 5% 6% 5% 10% 5%
[libx264 @ 000001b0c2399140] i8c dc,h,v,p: 47% 16% 33% 5%
[libx264 @ 000001b0c2399140] Weighted P-Frames: Y:28.0% UV:24.0%
[libx264 @ 000001b0c2399140] ref P L0: 57.0% 15.0% 19.1% 8.3% 0.5%
[libx264 @ 000001b0c2399140] ref B L0: 89.2% 8.5% 2.3%
[libx264 @ 000001b0c2399140] ref B L1: 97.9% 2.1%
[libx264 @ 000001b0c2399140] kb/s:159.04
=====
shuffleframes ...General frame manipulation that substitutes and/or discards video frames but that
does not insert (cannot add) frames [1].
shuffleframes=0 ...Default
¦
Template for unlimted substitutions (by existing frames) and/or discards. For example...
0 ...Passes the input frames to the output, unaltered (does nothing).
For a pattern of frames with a single, initial substitution:
0 0 ...For input frames 0 1 2 3 4 5 etc., outputs 0 0 2 2 4 4 etc.
0 0 2 ...For input frames 0 1 2 3 4 5 6 7 8 etc., outputs 0 0 2 3 3 5 6 6 8
etc.
0 0 2 3 ...For input frames 0 1 2 3 4 5 6 7 8 9 10 11 etc., outputs 0 0 2 3 4
4 6 7 8 8 10 11 etc.
For a pattern of frames with a single, final substitution:
0 0 ...For input frames 0 1 2 3 4 5 etc., outputs 0 0 2 2 4 4 etc.
0 1 1 ...For input frames 0 1 2 3 4 5 6 7 8 etc., outputs 0 1 1 3 4 4 6 7 7
etc.
0 1 2 2 ...For input frames 0 1 2 3 4 5 6 7 8 9 10 11 etc., outputs 0 1 2 2 4
5 6 6 8 9 10 10 etc.
For a pattern of frames with a single, internal substitution:
0 1 1 3 ...For input frames 0 1 2 3 4 5 6 7 8 9 10 11 etc., outputs 0 1 1 3 4
5 5 7 8 9 9 11 etc.
For a pattern of frames with a single, initial discard:
-1 ...Blocks the pipeline (discards all frames).
-1 1 ...Blocks the pipeline (discards all frames). ***** Expected 1 3 5 7 etc.
-1 1 2 ...Blocks the pipeline (discards all frames). ***** Expected 1 2 4 5 7 8 etc.
For a pattern of frames with a single, final discard:
0 -1 ...For input frames 0 1 2 3 4 5 etc., outputs 0 2 4 etc.
0 1 -1 ...For input frames 0 1 2 3 4 5 6 7 8 etc., outputs 0 1 3 4 6 7 etc.
0 1 2 -1 ...For input frames 0 1 2 3 4 5 6 7 8 9 10 11 etc., outputs 0 1 2 4
5 6 8 9 10 etc.
For a pattern of frames with a single, internal discard:
0 1 -1 3 ...For input frames 0 1 2 3 4 5 6 7 8 9 10 11 etc., outputs 0 1 3 4
5 7 8 9 11 etc.
For a pattern of frames with two substitutions (exchange) and a single, internal discard:
0 3 -1 1 ...For input frames 0 1 2 3 4 5 6 7 8 9 10 11 etc., outputs 0 3 1 4
7 5 8 11 9 etc.
[1] A scheme utilizing '+' to insert frames (similar to how '-' discards frames) was not implemented.
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