#11469: ffmpeg_demux: readrate plays "catch up" if output is blocked, then later
resumed
-------------------------------------+-------------------------------------
Reporter: Wallboy | Owner: Gyan
| Doshi <ffmpeg@…>
Type: defect | Status: closed
Priority: normal | Component: ffmpeg
Version: git-master | Resolution: fixed
Keywords: demuxer | Blocked By:
readrate |
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
-------------------------------------+-------------------------------------
Comment (by jb_alvarado):
@Gyan, this patch breaks `-re` and `-readrate 1`. When I use now
`-readrate 1` or `-re` I get a speed around ~0.5. Here is a full output:
{{{
./ffmpeg -re -i '/home/jb/Videos/Punkt Licht Trailer ASI HD FINAL.mp4' -f
null -
ffmpeg version N-118534-g6232f416b1 Copyright (c) 2000-2025 the FFmpeg
developers
built with gcc 14 (GCC)
configuration: --prefix=/home/jb/dev/github/compile-ffmpeg-osx-
linux/local --disable-debug --disable-shared --disable-doc --enable-gpl
--enable-version3 --enable-runtime-cpudetect --enable-avfilter
libavutil 59. 57.100 / 59. 57.100
libavcodec 61. 33.102 / 61. 33.102
libavformat 61. 9.107 / 61. 9.107
libavdevice 61. 4.100 / 61. 4.100
libavfilter 10. 9.100 / 10. 9.100
libswscale 8. 13.100 / 8. 13.100
libswresample 5. 4.100 / 5. 4.100
libpostproc 58. 4.100 / 58. 4.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/jb/Videos/Punkt Licht
Trailer ASI HD FINAL.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42mp41
creation_time : 2021-10-28T07:40:48.000000Z
Duration: 00:01:19.08, start: 0.000000, bitrate: 21036 kb/s
Stream #0:0[0x1](eng): Video: h264 (High) (avc1 / 0x31637661),
yuv420p(tv, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 20691 kb/s, 25
fps, 25 tbr, 25k tbn (default)
Metadata:
creation_time : 2021-10-28T07:40:48.000000Z
handler_name : ?Mainconcept Video Media Handler
vendor_id : [0][0][0][0]
encoder : AVC Coding
Stream #0:1[0x2](eng): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz,
stereo, fltp, 317 kb/s (default)
Metadata:
creation_time : 2021-10-28T07:40:48.000000Z
handler_name : #Mainconcept MP4 Sound Media Handler
vendor_id : [0][0][0][0]
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> wrapped_avframe (native))
Stream #0:1 -> #0:1 (aac (native) -> pcm_s16le (native))
Press [q] to stop, [?] for help
Output #0, null, to 'pipe:':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: mp42mp41
encoder : Lavf61.9.107
Stream #0:0(eng): Video: wrapped_avframe, yuv420p(tv, progressive),
1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 25 fps, 25 tbn (default)
Metadata:
encoder : Lavc61.33.102 wrapped_avframe
creation_time : 2021-10-28T07:40:48.000000Z
handler_name : ?Mainconcept Video Media Handler
vendor_id : [0][0][0][0]
Stream #0:1(eng): Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
(default)
Metadata:
encoder : Lavc61.33.102 pcm_s16le
creation_time : 2021-10-28T07:40:48.000000Z
handler_name : #Mainconcept MP4 Sound Media Handler
vendor_id : [0][0][0][0]
[out#0/null @ 0x2e29a240] video:849KiB audio:14828KiB subtitle:0KiB other
streams:0KiB global headers:0KiB muxing overhead: unknown
frame= 1977 fps= 14 q=-0.0 Lsize=N/A time=00:01:19.08 bitrate=N/A
speed=0.556x
}}}
--
Ticket URL: <https://trac.ffmpeg.org/ticket/11469#comment:6>
FFmpeg <https://ffmpeg.org>
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