View Issue Details

IDCategoryLast Update
0007312bugs2019-03-11 07:58
ReportergostevehowardAssigned To 
Reproducibilityalways 
Status newResolutionopen 
PlatformOSUbuntuOS Version16.10
Product Version5.8 
Fixed in Version 
Summary0007312: Audio export fails with negative -itsoffset for video track -- no video track in output
DescriptionI have a 0000009:0000010 min recording session in Ardour and a corresponding MP4 video, which starts slightly before the audio session. I import the video and drag the video track backwards to get it to line up with audio. I then only want to export a couple minutes starting about 8 min into the session, so I set the "start" and "end" markers. Everything looks good in Ardour, audio export works perfectly, so I go to video export with the mp4/h264 preset. I check the debug option so it prints the ffmpeg command:

/opt/Ardour-5.8.0/bin/ffmpeg_harvid -itsoffset -471.185 -i <path>.MP4 -i <path>/export/vtl_mysession.wav -acodec aac -strict -2 -t 159.351 -vcodec libx264 -metadata comment="Created with Ardour" -map 0:0 -map 1:0 -y <path>/export/export.mp4

The resulting export.mp4 file has no video track, just audio. I tried replacing the -itsoffset option with -ss (seek), running the following by hand (I manually copied the vtl_mysession.wav intermediate file beforehand):

/opt/Ardour-5.8.0/bin/ffmpeg_harvid -ss 471.185 -i <path>.MP4 -i <path>/export/vtl_mysession2.wav -acodec aac -strict
 -2 -t 159.351 -vcodec libx264 -metadata comment="Created with Ardour" -map 0:0 -map 1:0 -y <path>/export/export2_harvid.mp4

This seems to work perfectly.

Let me know if I can provide more info that will help. It's my first time reporting an Ardour bug so I don't know the ropes. And of course thank you so much for this wonderful wonderful piece of software.
TagsNo tags attached.

Activities

There are no notes attached to this issue.

Issue History

Date Modified Username Field Change
2017-04-10 00:55 gostevehoward New Issue