V23.05.14 can't play audio after exported to a mp4

Bug
1

What is your operating system?
Ubuntu 22.04.2 LTS

What is your Shotcut version (see Help > About Shotcut)?
v23.05.14 - not working
v22.12.21 - working fine

Ubuntu packages are all up to date.

Can you repeat the problem? If so, what are the steps?
Original video source is Panasonic GH6. Export to H264 + AAC.
AAC configuration is pretty mush default, 2ch 48000Hz, 384Kbps.
When I play it with different players, like MPV and vlcplayer, no audio come out.

MPV player can’t play audio like below error. Video only plays.

$ mpv testvideo_new.mp4
(+) Video --vid=1 () (h264 1920x1080 59.940fps)
(+) Audio --aid=1 () (aac 2ch 48000Hz)
VO: [gpu] 1920x1080 yuv420p
[lavf] Too many packets in the demuxer packet queues:
[lavf] video/0: 2547 packets, 157290336 bytes
[lavf] audio/1: 0 packets, 0 bytes

I don’t see any problem with media info. I check with mp4 fileformat sanitizer, there is no obvious error.

$ mediainfo testvideo_new.mp4
General
Complete name : testvideo_new.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom (isom/iso2/avc1/mp41)
File size : 2.58 GiB
Duration : 11 min 26 s
Overall bit rate mode : Variable
Overall bit rate : 32.3 Mb/s
Writing application : Lavf60.3.100

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L4.2
Format settings : 2 Ref Frames
Format settings, CABAC : No
Format settings, Reference frames : 2 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 11 min 26 s
Bit rate mode : Variable
Bit rate : 32.0 Mb/s
Maximum bit rate : 2 000 kb/s
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 59.940 (60000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.258
Stream size : 2.56 GiB (99%)
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
Codec configuration box : avcC

Audio
ID : 2
Format : AAC LC
Format/Info : Advanced Audio Codec Low Complexity
Codec ID : mp4a-40-2
Duration : 11 min 26 s
Source duration : 11 min 26 s
Bit rate mode : Variable
Bit rate : 224 kb/s
Maximum bit rate : 384 kb/s / 384 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 SPF)
Compression mode : Lossy
Stream size : 18.3 MiB (1%)
Source stream size : 18.3 MiB (1%)
Default : Yes
Alternate group : 1

When I upload it to YouTube, YouTube takes a lot of time to process it than usual, but audio is available in YouTube.

2

Unable to reproduce. Obviously, something like export using defaults, which makes AAC output is tested. Thus, you need to provide more information. Think when posting: how is the reader going to understand and try to figure it out? How did you install Shotcut?

I guess testvideo_new.mp4 is the video exported from Shotcut. It shows there is an audio track, but I guess you are saying it is silent. What else can you troubleshoot on your own and tell us? Does testvideo_new.mp4 play with sound in Shotcut? Does the project used to produce it play with sound in Shotcut.

3

I was in the middle of adding some more details.
I installed shotcut with snap.

$ snap list
Name Version Rev Tracking Publisher Notes
bare 1.0 5 latest/stable canonical✓ base
core18 20230503 2751 latest/stable canonical✓ base
core20 20230503 1891 latest/stable canonical✓ base
firefox 113.0.2-1 2710 latest/stable mozilla✓ -
shotcut 23.05.14 1104 latest/stable meltytech✓ classic
snapd 2.59.2 19122 latest/stable canonical✓ snapd

I tested with two different systems.
1.
Intel 10th Xeon processor
RAM 64GB
NVidia GTX 2080 Ti
Ubuntu 22.04.2 LTS

  1. Intel(R) Core™ i9-9980HK CPU
    RAM 16GB
    NVidia GTX 1060
    Ubuntu 22.04.2 LTS

When I export the video,
Use hardware encoder, h264_nvenc is checked
codec - h264_nvenc
Rate control: Quallity-based VBR
audio -2ch, 48000, aac, constant bitrate, 384kbps

My source files plays fine with mpv and shotcut project.
When I test with 2nd system, Shotcut was 22.12.21, with same source files, it was able to export the video and I am able to play audio/video fine.
After upgrading to shotcut 23.05.14, audio issue from exproted file is started.

4

I just tested the snap exporting using defaults with h264_nvenc hardware encoder, and the audio plays for me in mpv. There might be a problem with nvenc on your system. You should try without it. I suspect there is something about the high data rate of the video or audio muxing that is causing a playback problem in some players. That is why I suggested trying to play the result in Shotcut.

5

Ah, yes, when I added exported video, testvideo_new.mp4 to Shotcut, it display audio waveform nicely. I’m able to play audio from Shotcut.

I will try without hw encoder. update the result

6

I disabled hw encoder, use libx264.
I’m able to play video/audio after exporting.
Thank you for quick help, let me downgrade nvidia drivers and try again.