#11597: FFmpeg output is stuck if using split with fps filter -------------------------------------+------------------------------------- Reporter: TheTroll | Owner: (none) Type: defect | Status: new Priority: important | Component: avfilter Version: git-master | Resolution: Keywords: split | Blocked By: thumbnail | Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Description changed by TheTroll: Old description:

Summary of the bug: How to reproduce: {{{ % ffmpeg -re -y -i INPUT -filter_complex "[0:v]split=2[s0][sthumb];[s0]scale=320:184[o0];[sthumb]fps=1/60[othumb]" -an -c:v libx264 -map [o0] out.ts -map [othumb] -update 1 out.png }}}

Built on master

When trying to transcode an input live stream while extracting thumbnails (every minute in this example), using the split and fps filters, FFmpeg gets blocked and eventually generates the output after a while, by bursts.

The following warning indicates that something is wrong:

[out_#0:0 @ 0x7f1018013c00] 100 buffers queued in out_#0:0, something may be wrong.

FFmpeg 5.1.2 works fine and as expected.

Thanks

New description: Summary of the bug: How to reproduce: {{{ % ffmpeg -re -y -i INPUT -filter_complex "[0:v]split=2[o0][sthumb];[sthumb]fps=1/60[othumb]" -an -c:v libx264 -map [o0] out.ts -map [othumb] -update 1 out.png }}} Built on master When trying to transcode an input live stream while extracting thumbnails (every minute in this example), using the split and fps filters, FFmpeg gets blocked and eventually generates the output after a while, by bursts. The following warning indicates that something is wrong: [out_#0:0 @ 0x7f1018013c00] 100 buffers queued in out_#0:0, something may be wrong. FFmpeg 5.1.2 works fine and as expected. Thanks -- -- Ticket URL: <https://trac.ffmpeg.org/ticket/11597#comment:1> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

#11597: FFmpeg output is stuck if using split with fps filter -------------------------------------+------------------------------------- Reporter: TheTroll | Owner: (none) Type: defect | Status: new Priority: important | Component: avfilter Version: git-master | Resolution: Keywords: split | Blocked By: thumbnail | Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Comment (by TheTroll): Hi, Because to make a quick test, you can use any source file and use -re to make it act as a live stream. You can obtain the same issue removing -re and using a live URl as input. thanks -- Ticket URL: <https://trac.ffmpeg.org/ticket/11597#comment:3> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker

#11597: FFmpeg output is stuck if using split with fps filter -------------------------------------+------------------------------------- Reporter: TheTroll | Owner: (none) Type: defect | Status: new Priority: important | Component: avfilter Version: git-master | Resolution: Keywords: split | Blocked By: thumbnail | Blocking: | Reproduced by developer: 0 Analyzed by developer: 0 | -------------------------------------+------------------------------------- Comment (by TheTroll): OMG that helped! Thanks for the trick. That's a good one, I wonder why the split thing doesnt work anymore though? -- Ticket URL: <https://trac.ffmpeg.org/ticket/11597#comment:5> FFmpeg <https://ffmpeg.org> FFmpeg issue tracker