https://www.youtube.com/watch?v=joUC23LASPk Kdenlive bug: 0:00 Selecting certain areas of video, the video freezes for awhile and then the audio plays stuttered at like 8x speed. 0:24 Meanwhile, selecting other areas magically works. 0:44 Another broken section OBS, CQP encoding (CQ 23) using NVENC H.264 (new). OBS is brand new (v26.1.1 at the time of recording) The bug happens EVERY TIME at the SAME locations of the video file. ala the same section of video will always fail to preview. - File is ~5 GB. Has 3 audio tracks and 1 video track at 30 FPS. - The only thing I could even imagine (other than a straight up bug) is the OBS encoder was occasionally missing frames (less than 30 FPS) and Kdenlive explodes when it hits a chunk that has less than the designated "file wide" assumed expected FPS. - File plays JUST FINE in Media Player Classic and VLC
- It appears to be FINE when RENDERED, only the PREVIEW is affected.
Another poster with the same issue. https://forum.kde.org/viewtopic.php?f=265&t=169978&p=442879#p442879 > playback is out of sync with audio and playback is like speedup twice or three time
Identical to issue reported here: https://forum.kde.org/viewtopic.php?t=169978
I assume the NVENC H.264 file is the issue. Can you export out of OBS with another codec? How many audio channels do you use? Can you try without the MKV container?
@emohr I have an x264 encoded video file. Same issue.
Issue still present in Nightly build 21.03.70
Created attachment 136219 [details] Kdenlive + OBS audio preview corruption bug.png I see on the YouTube video that the clip job for preview is still running (in the project bin) while you playback. Let the job finishing before you playback. Still the same issue.
This also affected a bluray rip of the movie Hot Rod. I let the preview rendering run and it still did it. Not OBS. Not NVENC.
Could you upload a short portion (ca. 1.5min) of the video that I can check if this preview stutter happens on Windows as well? Do you are on Linux?
I THINK I FOUND THE ISSUE, as well as a WORKAROUND for users: - It affects MKV files of significant length. Chopping Hot Rod down to a 1 minute clip (of the affected region) removed the issue. But more importantly: - Converting the files to MP4 format __removes the issue__ ffmpeg -i [myfile] -c copy -map 0 [output.mp4] [the -map 0 switch is for keeping multiple audio tracks] - Tested on both the Hot Rod movie bluray as well one of my affected OBS recordings So as far as I can tell, using MP4 files prevents the bug from occurring. Here is the ffprobe output of the BREAKING version of the Hot Rod movie: ----------------------------------------------------------------------------- ffmpeg version N-100410-gcd821c18dc Copyright (c) 2000-2020 the FFmpeg developers built with gcc 9.3-win32 (GCC) 20200320 configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-zlib --enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-opencl --enable-libvmaf --enable-vulkan --enable-libvorbis --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-libdavs2 --enable-ffnvcodec --enable-cuda-llvm --enable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-librubberband --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libsvtav1 --enable-libtwolame --enable-libuavs3d --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libzimg --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp libavutil 56. 62.100 / 56. 62.100 libavcodec 58.115.102 / 58.115.102 libavformat 58. 65.100 / 58. 65.100 libavdevice 58. 11.103 / 58. 11.103 libavfilter 7. 93.100 / 7. 93.100 libswscale 5. 8.100 / 5. 8.100 libswresample 3. 8.100 / 3. 8.100 libpostproc 55. 8.100 / 55. 8.100 Input #0, matroska,webm, from 'Hot.Rod.2007.1080p.BluRay.DTS.x264-ETRG.mkv': Metadata: encoder : libebml v1.3.3 + libmatroska v1.4.4 creation_time : 2016-06-29T19:51:54.000000Z Duration: 01:27:56.15, start: 0.000000, bitrate: 7371 kb/s Chapter #0:0: start 0.000000, end 512.845000 Metadata: title : Chapter 1 Chapter #0:1: start 512.845000, end 938.062000 Metadata: title : Chapter 2 Chapter #0:2: start 938.062000, end 1444.276000 Metadata: title : Chapter 3 Chapter #0:3: start 1444.276000, end 2003.042000 Metadata: title : Chapter 4 Chapter #0:4: start 2003.042000, end 2456.745000 Metadata: title : Chapter 5 Chapter #0:5: start 2456.745000, end 2971.843000 Metadata: title : Chapter 6 Chapter #0:6: start 2971.843000, end 3441.396000 Metadata: title : Chapter 7 Chapter #0:7: start 3441.396000, end 3952.782000 Metadata: title : Chapter 8 Chapter #0:8: start 3952.782000, end 4438.809000 Metadata: title : Chapter 9 Chapter #0:9: start 4438.809000, end 4982.894000 Metadata: title : Chapter 10 Chapter #0:10: start 4982.894000, end 5276.150000 Metadata: title : Chapter 11 Stream #0:0: Video: h264 (High), yuv420p(progressive), 1920x832 [SAR 1:1 DAR 30:13], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default) Metadata: BPS : 5860624 BPS-eng : 5860624 DURATION : 01:27:56.146000000 DURATION-eng : 01:27:56.146000000 NUMBER_OF_FRAMES: 126501 NUMBER_OF_FRAMES-eng: 126501 NUMBER_OF_BYTES : 3865188624 NUMBER_OF_BYTES-eng: 3865188624 _STATISTICS_WRITING_APP: mkvmerge v9.2.0 ('Photograph') 64bit _STATISTICS_WRITING_APP-eng: mkvmerge v9.2.0 ('Photograph') 64bit _STATISTICS_WRITING_DATE_UTC: 2016-06-29 19:51:54 _STATISTICS_WRITING_DATE_UTC-eng: 2016-06-29 19:51:54 _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES Stream #0:1(eng): Audio: dts (DTS), 48000 Hz, 5.1(side), fltp, 1536 kb/s (default) Metadata: title : Surround Sound BPS : 1508999 BPS-eng : 1508999 DURATION : 01:27:56.150000000 DURATION-eng : 01:27:56.150000000 NUMBER_OF_FRAMES: 494639 NUMBER_OF_FRAMES-eng: 494639 NUMBER_OF_BYTES : 995213668 NUMBER_OF_BYTES-eng: 995213668 _STATISTICS_WRITING_APP: mkvmerge v9.2.0 ('Photograph') 64bit _STATISTICS_WRITING_APP-eng: mkvmerge v9.2.0 ('Photograph') 64bit _STATISTICS_WRITING_DATE_UTC: 2016-06-29 19:51:54 _STATISTICS_WRITING_DATE_UTC-eng: 2016-06-29 19:51:54 _STATISTICS_TAGS: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES _STATISTICS_TAGS-eng: BPS DURATION NUMBER_OF_FRAMES NUMBER_OF_BYTES I simply converted using ffmpeg with "-c copy" to MP4 and now the output: ----------------------------------------------------------------------------- ffprobe version N-100410-gcd821c18dc Copyright (c) 2007-2020 the FFmpeg developers built with gcc 9.3-win32 (GCC) 20200320 configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-zlib --enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-opencl --enable-libvmaf --enable-vulkan --enable-libvorbis --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-libdavs2 --enable-ffnvcodec --enable-cuda-llvm --enable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-librubberband --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libsvtav1 --enable-libtwolame --enable-libuavs3d --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libzimg --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp libavutil 56. 62.100 / 56. 62.100 libavcodec 58.115.102 / 58.115.102 libavformat 58. 65.100 / 58. 65.100 libavdevice 58. 11.103 / 58. 11.103 libavfilter 7. 93.100 / 7. 93.100 libswscale 5. 8.100 / 5. 8.100 libswresample 3. 8.100 / 3. 8.100 libpostproc 55. 8.100 / 55. 8.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output2-full.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf58.65.100 Duration: 01:27:56.15, start: 0.000000, bitrate: 7380 kb/s Chapter #0:0: start 0.000000, end 512.845000 Metadata: title : Chapter 1 Chapter #0:1: start 512.845000, end 938.062000 Metadata: title : Chapter 2 Chapter #0:2: start 938.062000, end 1444.276000 Metadata: title : Chapter 3 Chapter #0:3: start 1444.276000, end 2003.042000 Metadata: title : Chapter 4 Chapter #0:4: start 2003.042000, end 2456.745000 Metadata: title : Chapter 5 Chapter #0:5: start 2456.745000, end 2971.843000 Metadata: title : Chapter 6 Chapter #0:6: start 2971.843000, end 3441.396000 Metadata: title : Chapter 7 Chapter #0:7: start 3441.396000, end 3952.782000 Metadata: title : Chapter 8 Chapter #0:8: start 3952.782000, end 4438.809000 Metadata: title : Chapter 9 Chapter #0:9: start 4438.809000, end 4982.894000 Metadata: title : Chapter 10 Chapter #0:10: start 4982.894000, end 5276.150000 Metadata: title : Chapter 11 Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x832 [SAR 1:1 DAR 30:13], 5860 kb/s, 23.98 fps, 23.98 tbr, 16k tbn, 47.95 tbc (default) Metadata: handler_name : VideoHandler vendor_id : [0][0][0][0] Stream #0:1(eng): Audio: dts (DTS) (mp4a / 0x6134706D), 48000 Hz, 5.1(side), fltp, 1536 kb/s (default) Metadata: handler_name : SoundHandler vendor_id : [0][0][0][0] Stream #0:2(eng): Data: bin_data (text / 0x74786574) Metadata: handler_name : SubtitleHandler Unsupported codec with id 100359 for input stream 2 I cannot exhaustively say it doesn't break. But I keep flipping through it and nothing is breaking so far. Output for my OBS recordings: ----------------------------------------------------------------------------- Original MKV file ffprobe libavutil 56. 62.100 / 56. 62.100 libavcodec 58.115.102 / 58.115.102 libavformat 58. 65.100 / 58. 65.100 libavdevice 58. 11.103 / 58. 11.103 libavfilter 7. 93.100 / 7. 93.100 libswscale 5. 8.100 / 5. 8.100 libswresample 3. 8.100 / 3. 8.100 libpostproc 55. 8.100 / 55. 8.100 Input #0, matroska,webm, from '2021-03-04 18-51-20.mkv': Metadata: ENCODER : Lavf58.29.100 Duration: 01:38:47.63, start: 0.000000, bitrate: 5170 kb/s Stream #0:0: Video: h264 (High), yuv420p(tv, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 30 fps, 30 tbr, 1k tbn, 60 tbc (default) Metadata: DURATION : 01:38:47.633000000 Stream #0:1: Audio: aac (LC), 48000 Hz, stereo, fltp (default) Metadata: title : Track1 DURATION : 01:38:47.552000000 Stream #0:2: Audio: aac (LC), 48000 Hz, stereo, fltp (default) Metadata: title : Track2 DURATION : 01:38:47.552000000 Stream #0:3: Audio: aac (LC), 48000 Hz, stereo, fltp (default) Metadata: title : Track3 DURATION : 01:38:47.552000000 New version using -c copy -map 0 to mp4 [NOTE: -map 0 is required for multiple audio tracks to move over] ----------------------------------------------------------------------------- libavutil 56. 62.100 / 56. 62.100 libavcodec 58.115.102 / 58.115.102 libavformat 58. 65.100 / 58. 65.100 libavdevice 58. 11.103 / 58. 11.103 libavfilter 7. 93.100 / 7. 93.100 libswscale 5. 8.100 / 5. 8.100 libswresample 3. 8.100 / 3. 8.100 libpostproc 55. 8.100 / 55. 8.100 Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '2021-03-04 18-51-20B.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf58.65.100 Duration: 01:38:47.63, start: 0.000000, bitrate: 5174 kb/s Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709), 1920x1080 [SAR 1:1 DAR 16:9], 4681 kb/s, 30 fps, 30 tbr, 16k tbn, 60 tbc (default) Metadata: handler_name : VideoHandler vendor_id : [0][0][0][0] Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 161 kb/s (default) Metadata: handler_name : SoundHandler vendor_id : [0][0][0][0] Stream #0:2(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 160 kb/s (default) Metadata: handler_name : SoundHandler vendor_id : [0][0][0][0] Stream #0:3(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 157 kb/s (default) Metadata: handler_name : SoundHandler vendor_id : [0][0][0][0]
- For those that don't know, converting to MP4 from MKV does not change or re-encode the data so it will not make it "lossy" or recompressed. The only trick there is remembering -map 0 for multi-track recordings or it will only copy the first audio track. - It's also possible for OBS users that the OBS "remux" command [File -> Remux Recordings] will do this same conversion without requiring you to install ffmpeg or understand how to use command prompt.
Oh, I missed a previous comment. This affects WINDOWS.
Hi and thank you for your patience. Your bug report was for a version of Kdenlive that is at least four years old. Can you please check whether this issue still exists in the latest version 24.12.0? If yes, please update this report to reflect the new version and set the status to CONFIRMED. If it works now like you expect it would, you may change the status of this report to RESOLVED - FIXED. At any rate, this report will be closed if there is no activity for the next 30 days.
🐛🧹 ⚠️ This bug has been in NEEDSINFO status with no change for at least 15 days. Please provide the requested information, then set the bug status to REPORTED. If there is no change for at least 30 days, it will be automatically closed as RESOLVED WORKSFORME. For more information about our bug triaging procedures, please read https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging. Thank you for helping us make KDE software even better for everyone!
🐛🧹 This bug has been in NEEDSINFO status with no change for at least 30 days. Closing as RESOLVED WORKSFORME.