Opened 4 years ago
Closed 4 years ago
#8634 closed defect (fixed)
Unexpected filterchain behaviour
Reported by: | Carl Eugen Hoyos | Owned by: | |
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Priority: | normal | Component: | avfilter |
Version: | git-master | Keywords: | interleave |
Cc: | Blocked By: | ||
Blocking: | Reproduced by developer: | no | |
Analyzed by developer: | no |
Description
Some filterchains do not terminate, they do terminate with minimal changes:
$ ffmpeg -f lavfi -i testsrc=d=10 -vf "split[a],select=eq(mod(n\,2)\,1)[b],[a]select=eq(mod(n\,2)\,0),[b]interleave" -f null - ffmpeg version N-97485-g6cfb33f976 Copyright (c) 2000-2020 the FFmpeg developers built with gcc 9 (SUSE Linux) configuration: --enable-gpl libavutil 56. 43.100 / 56. 43.100 libavcodec 58. 82.100 / 58. 82.100 libavformat 58. 42.101 / 58. 42.101 libavdevice 58. 9.103 / 58. 9.103 libavfilter 7. 79.100 / 7. 79.100 libswscale 5. 6.101 / 5. 6.101 libswresample 3. 6.100 / 3. 6.100 libpostproc 55. 6.100 / 55. 6.100 Input #0, lavfi, from 'testsrc=d=10': Duration: N/A, start: 0.000000, bitrate: N/A Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 320x240 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc Stream mapping: Stream #0:0 -> #0:0 (rawvideo (native) -> wrapped_avframe (native)) Press [q] to stop, [?] for help Output #0, null, to 'pipe:': Metadata: encoder : Lavf58.42.101 Stream #0:0: Video: wrapped_avframe, rgb24, 320x240 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 1000k tbn, 1000k tbc Metadata: encoder : Lavc58.82.100 wrapped_avframe [Parsed_testsrc_0 @ 0x3d35780] EOF timestamp not reliable frame= 250 fps=0.0 q=-0.0 Lsize=N/A time=00:00:09.96 bitrate=N/A speed= 197x video:131kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
(above does terminate)
$ ffmpeg -f lavfi -i testsrc=d=10 -vf "split[a],select=eq(mod(n\,2)\,0)[b],[a]select=eq(mod(n\,2)\,1),[b]interleave" -f null - ffmpeg version N-97485-g6cfb33f976 Copyright (c) 2000-2020 the FFmpeg developers built with gcc 9 (SUSE Linux) configuration: --enable-gpl libavutil 56. 43.100 / 56. 43.100 libavcodec 58. 82.100 / 58. 82.100 libavformat 58. 42.101 / 58. 42.101 libavdevice 58. 9.103 / 58. 9.103 libavfilter 7. 79.100 / 7. 79.100 libswscale 5. 6.101 / 5. 6.101 libswresample 3. 6.100 / 3. 6.100 libpostproc 55. 6.100 / 55. 6.100 Input #0, lavfi, from 'testsrc=d=10': Duration: N/A, start: 0.000000, bitrate: N/A Stream #0:0: Video: rawvideo (RGB[24] / 0x18424752), rgb24, 320x240 [SAR 1:1 DAR 4:3], 25 tbr, 25 tbn, 25 tbc Stream mapping: Stream #0:0 -> #0:0 (rawvideo (native) -> wrapped_avframe (native)) Press [q] to stop, [?] for help Output #0, null, to 'pipe:': Metadata: encoder : Lavf58.42.101 Stream #0:0: Video: wrapped_avframe, rgb24, 320x240 [SAR 1:1 DAR 4:3], q=2-31, 200 kb/s, 1000k tbn, 1000k tbc Metadata: encoder : Lavc58.82.100 wrapped_avframe [Parsed_testsrc_0 @ 0x3d95780] EOF timestamp not reliable frame= 249 fps= 92 q=-0.0 Lsize=N/A time=00:00:09.92 bitrate=N/A speed=3.65x
(above does not terminate, the only difference is that the select filters are exchanged)
The difference is also visible if the duration of the input changed:
$ ffmpeg -f lavfi -i testsrc=d=10 -vf "split[a],select=eq(mod(n\,2)\,1)[b],[a]select=eq(mod(n\,2)\,0),[b]interleave" -f null - $ ffmpeg -f lavfi -i testsrc=d=11 -vf "split[a],select=eq(mod(n\,2)\,1)[b],[a]select=eq(mod(n\,2)\,0),[b]interleave" -f null -
The first command terminates, the second does not.
Above command lines allow to reproduce the issue since f_interleave was switched to active.
Change History (1)
comment:1 by , 4 years ago
Keywords: | interleave added |
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Resolution: | → fixed |
Status: | new → closed |
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Different aspects of this behaviour were fixed by Paul in 35bcbfd6da59ecb5288a6a823be731b4db30b365 and some earlier commits.