Opened 9 years ago
Last modified 9 years ago
#4883 new defect
Audio with multiple sample rates causes pitch issues
| Reported by: | Tal Lev-Ami | Owned by: | |
|---|---|---|---|
| Priority: | normal | Component: | undetermined |
| Version: | git-master | Keywords: | mov aac |
| Cc: | Blocked By: | ||
| Blocking: | Reproduced by developer: | no | |
| Analyzed by developer: | no |
Description
Summary of the bug:
Encoding a video whose audio track as two parts one with 44100 and one with 48000 causes pitch issues in one of the parts.
How to reproduce:
% ffmpeg -report -y -i nlpebvbo8gaxpvffcnb6.mp4 -codec:v libx264 -codec:a libfaac -pix_fmt yuv420p -crf 30 out.mp4
Attached is the log file from running with -report.
Attachments (1)
Change History (5)
by , 9 years ago
| Attachment: | ffmpeg-20150926-233850.log added |
|---|
comment:2 by , 9 years ago
| Keywords: | mov aac added |
|---|---|
| Version: | unspecified → git-master |
How was the sample created? The aac bitstream signals 48kHz afaict, how is the decoder supposed to know that it is meant to be 44100? Or do I misunderstand?
comment:3 by , 9 years ago
I'm trying to determine the source of the video. I'll update when I have more details.
Note that Adobe Media Encoder was able to successfully manipulate this video and it runs properly in QuickTime.
Also, ffprobe's audio stream is reported with:
"sample_rate": "48000",
"codec_time_base": "1/48000",
"time_base": "1/44100",
comment:4 by , 9 years ago
The video was created using Apple’s AVFoundation framework. Two videos were set together in the timeline, and exported using the default setting for an MP4 (using AVAssetExportSession).
log file