| Summary: | audio/video desync for clips with "start:" != 00:00:00.0 | ||
|---|---|---|---|
| Product: | [Applications] kdenlive | Reporter: | Daniel Musketa <daniel.musketa> |
| Component: | Rendering & Export | Assignee: | Jean-Baptiste Mardelle <jb> |
| Status: | RESOLVED WAITINGFORINFO | ||
| Severity: | minor | CC: | grzesiek.golec, walmartshopper, wegwerf-1-2-3 |
| Priority: | NOR | ||
| Version First Reported In: | unspecified | ||
| Target Milestone: | --- | ||
| Platform: | Ubuntu | ||
| OS: | Linux | ||
| Latest Commit: | Version Fixed/Implemented In: | ||
| Sentry Crash Report: | |||
I'm not sure if it's the same issue, but I noticed if I cut out the first few seconds of a song and then slide it to the beginning of the timeline, I get audio sync issues after some time. Closing kdenlive and re-opening the project seems to fix it. Can you please try playing your original clip using melt to see if the desync is already happedning at the MLT layer? If yes, this needs to be reported upstream to the MLT project, otherwise it may be in Kdenlive's ballpark. |
When I use video files that were generated with a start timestamp other than 00:00:00.0 I get a/v desync when skipping towards the end of that clip. Reproducible: Always Steps to Reproduce: Example: $ avconv -i input_1920x1080.mov -map 0:0 -map 0:1 -codec:v dnxhd -b:v 185M -ac 2 -codec:a pcm_s16le -f segment -segment_time 60 output_%03d.mov The resulting files look something like this: $ avprobe output_119.mov avprobe version 12_dev0-6:12~~git20150417.1336bb0~ubuntu14.04.1, Copyright (c) 2007-2015 the Libav developers built on Apr 17 2015 18:48:09 with gcc 4.8 (Ubuntu 4.8.2-19ubuntu1) [mov,mp4,m4a,3gp,3g2,mj2 @ 0x1d050c0] multiple edit list entries, a/v desync might occur, patch welcome [mov,mp4,m4a,3gp,3g2,mj2 @ 0x1d050c0] multiple edit list entries, a/v desync might occur, patch welcome Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output119.mov': Metadata: major_brand : qt minor_version : 512 compatible_brands: qt encoder : Lavf56.18.0 Duration: 00:01:00.02, start: 7140.007000, bitrate: 177506 kb/s Stream #0:0(eng): Video: dnxhd [AVdn / 0x6E645641] yuv422p, 1920x1080, 175984 kb/s 23.98 fps, 24k tbn (default) Metadata: handler_name : DataHandler Stream #0:1(eng): Audio: pcm_s16le [lpcm / 0x6D63706C] 48000 Hz, stereo, s16, 1536 kb/s (default) Metadata: handler_name : DataHandler # avprobe output The "start: 7140.007000" seems to be important here. If I do $ avconv -i output_119.mov -map 0:0 -map 0:1 -codec:v copy -codec:a copy output_119.CLEAN.mov I get "start: 0.000000" and the problem does not appear.