#11409: Using -af and -vf with non-exhistant filter succeeds if input lacks
required stream type
-------------------------------------+-------------------------------------
Reporter: Wes Castro | Type: defect
Status: new | Priority: normal
Component: ffmpeg | Version:
| unspecified
Keywords: | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Summary of the bug:
When invoking the FFmpeg binary with `-af` of `-vf` followed by a filter
that doesn't exist (for example `not_a_filter`) it silently ignores the
error and succeeds as if the option wasn't passed in if the input has no
streams of the required type. For example, if an audio input is used and
`-vf not_a_filter` is passed in, it succeeds. Similarly, if a video input
is used and `-af not_a_filter` is passed in it will also succeed.
Note that with `-filter_complex` it seems to always fail if a filter isn't
found regardless of input type.
How to reproduce:
Audio input with `-vf`:
{{{
./ffmpeg -f lavfi -i sine=frequency=1000:duration=1 -vf not_a_filter -f
null -
ffmpeg version N-118273-g251de1791e Copyright (c) 2000-2025 the FFmpeg
developers
built with gcc 11 (GCC)
configuration: --enable-gpl
libavutil 59. 54.101 / 59. 54.101
libavcodec 61. 31.100 / 61. 31.100
libavformat 61. 9.104 / 61. 9.104
libavdevice 61. 4.100 / 61. 4.100
libavfilter 10. 6.101 / 10. 6.101
libswscale 8. 13.100 / 8. 13.100
libswresample 5. 4.100 / 5. 4.100
libpostproc 58. 4.100 / 58. 4.100
[out @ 0x2fd9b80] The "sample_fmts" option is deprecated: set the
supported sample formats
[out @ 0x2fd9b80] The "all_channel_counts" option is deprecated: accept
all channel counts
Input #0, lavfi, from 'sine=frequency=1000:duration=1':
Duration: N/A, start: 0.000000, bitrate: 705 kb/s
Stream #0:0: Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (pcm_s16le (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, null, to 'pipe:':
Metadata:
encoder : Lavf61.9.104
Stream #0:0: Audio: pcm_s16le, 44100 Hz, mono, s16, 705 kb/s
Metadata:
encoder : Lavc61.31.100 pcm_s16le
[out#0/null @ 0x2fddfc0] video:0KiB audio:86KiB subtitle:0KiB other
streams:0KiB global headers:0KiB muxing overhead: unknown
size=N/A time=00:00:01.00 bitrate=N/A speed= 351x
}}}
Video input with `-af`:
{{{
./ffmpeg -f lavfi -i testsrc -t 10 -af not_a_filter -f null -
ffmpeg version N-118273-g251de1791e Copyright (c) 2000-2025 the FFmpeg
developers
built with gcc 11 (GCC)
configuration: --enable-gpl
libavutil 59. 54.101 / 59. 54.101
libavcodec 61. 31.100 / 61. 31.100
libavformat 61. 9.104 / 61. 9.104
libavdevice 61. 4.100 / 61. 4.100
libavfilter 10. 6.101 / 10. 6.101
libswscale 8. 13.100 / 8. 13.100
libswresample 5. 4.100 / 5. 4.100
libpostproc 58. 4.100 / 58. 4.100
Input #0, lavfi, from 'testsrc':
Duration: N/A, start: 0.000000, bitrate: N/A
Stream #0:0: Video: wrapped_avframe, rgb24, 320x240 [SAR 1:1 DAR 4:3],
25 fps, 25 tbr, 25 tbn
Stream mapping:
Stream #0:0 -> #0:0 (wrapped_avframe (native) -> wrapped_avframe
(native))
Press [q] to stop, [?] for help
Output #0, null, to 'pipe:':
Metadata:
encoder : Lavf61.9.104
Stream #0:0: Video: wrapped_avframe, rgb24(pc, gbr/unknown/unknown,
progressive), 320x240 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 25 fps, 25 tbn
Metadata:
encoder : Lavc61.31.100 wrapped_avframe
[out#0/null @ 0x2fcd140] video:107KiB audio:0KiB subtitle:0KiB other
streams:0KiB global headers:0KiB muxing overhead: unknown
frame= 250 fps=0.0 q=-0.0 Lsize=N/A time=00:00:10.00 bitrate=N/A speed=
315x
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/11409>
FFmpeg <https://ffmpeg.org>
FFmpeg issue tracker
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