frame sync error ac3 Richburg South Carolina

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frame sync error ac3 Richburg, South Carolina

I have DVB receivers myself and changes between Dolby Stereo and Dolby Surround happen often, and I know that -async does not work well with channel changes (your original sample showed to convert video to mpg4 chris1497August 13th, 2011, 06:21 AMI'm currently using handbrake (with the gui) to convert some video files to mpg4. I am also uploading the ffprobe -show_frames csv file in which I have indicated (with '-->') where the audio changes from 6ch to stereo and vice versa. This is pretty bad for me, because I think this causes a slight desync.

at comment:5 Changed 4 years ago by cehoyos Priority changed from important to normal I tested the following command: $ ffmpeg -i ac3_channel_change_bug.ts -vcodec mpeg2video -qscale 0 -flags +ilme+ildct -top Output #0, avi, to 'out100async.avi': Metadata: ISFT : Lavf54.63.100 Stream #0:0: Video: mpeg4 (FMP4 / 0x34504D46), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 200 kb/s, 29.97 tbn, 29.97 tbc Stream #0:1(eng): This means it fails with the same error in both cases. ffmpeg -y -i sample-issue-xxx.m4v What is the expected result?

Board index All times are UTC Powered by phpBB Forum Software © phpBB Group Home/News | About | Download | Documentation | Forum | Bug Reports | Contact | Donations | Am I doing anything wrong or is there a bug in the new version? Files included in "Ticket 2210 AC3 Channel Change.7z": ORIG_short.ts [the 2.5min clip] probeOrigShort.csv [the stdout when running ORIG_short.ts through ffprobe -show_frames] fix_short_log.txt [the stderr and stdout that I get when running Then I find the frames at which I need to cut, and use tsmuxer to do it.

Terms Privacy Security Status Help You can't perform that action at this time. In the log I am attaching, you will see that the audio changes from 6ch to stereo or vice versa a total of 6 times. This used to work before. I need it because there are often gaps in the audio, and that corrects them.

Last edited 4 years ago by agni451 (previous) (diff) comment:7 Changed 4 years ago by cehoyos Keywords async added Version changed from unspecified to git-master comment:8 Changed 4 years ago by If I was more than an amateur at programming I would try to find out which which library is responsible for the confusion and suggest a correction. Total size is 9.33MB. A further 1 minute and 9 seconds (approx) of silent audio have been added where the audio changes from stereo back to 6ch.

Any additional information: Sample plays in VCL: yes Command: ffmpeg version N-30103-g358d837, Copyright (c) 2000-2011 the FFmpeg developers built on Sep 21 2011 10:18:24 with clang 2.1 (tags/Apple/clang-163.7.1) configuration: --enable-zlib --disable-debug i'll try to figure it out, but if you have some know thx again. I uploaded a sample named "dvdsample" using ​, but I'm not really sure where the upload form put it. (Maybe failed?) comment:3 Changed 2 years ago by gjdfgh Cc [email protected] added It won't just "pause" it will be completely out of sync.

After getting the error I tried "--normalize-mix true", "--normalize-mix" and "--normalize-mix 1,1" but they all fail. comment:2 in reply to: ↑ 1 Changed 4 years ago by agni451 Replying to cehoyos: Please provide the input sample. The police cordon off Grandma's cottage and an amphibious version of William Powell n composer : show : episode_id : network : Duration: 01:20:53.97, start: 0.000000, bitrate: 8 kb/s Stream #0.0(eng): Perhaps AC3 > is not even the best option for the purpose?

This error also happens when seeking with libdvdread or libdvdnav (in which case seeking with libavformat is not involved at all). Check ORIG_short.ts' duration against the new out.avi duration: the video is 2.5 min long, while the new "fixed" audio is 3:44. comment:18 Changed 4 years ago by agni451 I've managed to find a clip that contains both an audio change and several large gaps. Async works very well for that (except in this case).

comment:20 follow-up: ↓ 21 Changed 4 years ago by agni451 Looks like you're getting the same results as me. The same thing happens again at 1:07 for 1min 9 secs. They are both completely unrelated to ffmpeg. Here's a youtube ( tutorial.

contains the offending ac3 blip Download all attachments as: .zip Oldest first Newest first Threaded Comments only Change History (7) Changed 7 months ago by rogerdpack Attachment 7mate.small.ts​ added contains the Download in other formats: Comma-delimited Text Tab-delimited Text RSS Feed Powered by Trac 1.0.1 By Edgewall Software. Quote Postby diegocr » Sun May 22, 2011 11:13 am Hello,Imagine an scenario... However, when it's demuxed, re-encoded and brought back together, the extra silent audio is still there, causing a massive sync problem.

That might not be noticeable, but I've seen gaps of 768ms, which would be a huge problem. Oldest first Newest first Threaded Comments only Change History (5) comment:1 Changed 5 years ago by cehoyos Description modified (diff) Priority changed from normal to minor Reproduced by developer set Status comment:15 follow-up: ↓ 16 Changed 4 years ago by agni451 the -async 48000 flag is missing. The police cordon off Grandma's cottage and an amphibious version of William Powell n synopsis : Hoodwinked fuses the classic fairy tale of Little Red Riding Hood with the crisscrossing storylines

Attachments (1) 7mate.small.ts​ (1.4 MB) - added by rogerdpack 7 months ago. Error while decoding stream #0.1 Error while decoding stream #0.1 Last message repeated 389 times [mov,mp4,m4a,3gp,3g2,mj2 @ 0x12b6780] stream 1, offset 0x4e250b: partial file size= 96kB time=00:00:00.51 bitrate=1536.7kbits/s video:0kB audio:96kB global What we do not have is a sample that needs -async (because audio plays out-of-sync without) and fails at the same time with it (because it contains channel count changes). Converted file including audio data (at the end of the mov example you can hear sound).

I say occasionally because I ran the sample I gave in comment 18 (it has channel changes AND gaps AND timestamp drift) and it didn't have a problem. Take the previously created "gaps.ts" and run it without async: ffmpeg -i "gaps.ts" -q:vscale 2 -acodec ac3 -ab 384k -ac 6 "out2.avi" That file will have out of sync audio that EDIT: Should be in /incoming Last edited 4 years ago by agni451 (previous) (diff) comment:13 Changed 4 years ago by agni451 Any updates? I'm hoping you can see why one would have a problem and not the other.

Attachments (1) FIXLOG.7z​ (338.5 KB) - added by agni451 4 years ago. Visit the Trac open source project at Search: LoginPreferencesHelp/GuideAbout TracRegister WikiTimelineView TicketsSearchTags Context Navigation +0← Previous TicketNext Ticket → Opened 7 months ago Closed 6 months ago Last modified 5 months However, the length of the audio is 00:03:44.032, and putting it in audacity clearly shows that an unnecessary 6sec (approx) of silent audio has been added where the channels change from What happens instead?

That -async command is a real timesaver; until I discovered that it worked to fill gaps I had to use a combination of an MPEG2 repair tool to log errors and This causes extreme problems with the fixed stream using the above commandline, as I suddenly start getting messages like " st:0 PTS: 100320 DTS: 100320 < 64387716 invalid, clipping" and adding Visit the Trac open source project at Search: LoginPreferencesHelp/GuideAbout TracRegister WikiTimelineView TicketsSearchTags Context Navigation +1← Previous TicketNext Ticket → Opened 5 years ago Last modified 2 years ago #1182 open defect Unfortunately, it seems to be confused by the change in audio channel layout and adds far more than it should.