HDV MPEG2 MP2 Sound Decoded as Digital Noise

[Twenkid]

Describe the bug:

The sound from HDV MPEG2 videos (MP2), .M2T from a Canon HV30 camera. The sound in the editor and when exporting is digital noise. Is it supposed to be supported?

Sample noise: https://github.com/Twenkid/OpenShot/blob/master/diginoise.aac

The workaround is converting the sources with ffmpeg to anothe audio format, e.g:

ffmpeg -i "I:\2016g-2016.06.12_12-17-09.m2t" -c:v copy -c:a pcm_s16le "I:\2016g-2016.06.12_12-17-09.avi"

The format is:

{
"acodec": "mp2",
"audio_bit_rate": 384000,
"audio_stream_index": 1,
"audio_timebase": {
"den": 90000,
"num": 1
},
"channel_layout": 3,
"channels": 2,
"display_ratio": {
"den": 9,
"num": 16
},
"duration": 16.511999130249023,
"file_size": "55781104",
"fps": {
"den": 1001,
"num": 30000
},
"has_audio": true,
"has_single_image": false,
"has_video": true,
"height": 1080,
"id": "Y138S17TAL",
"interlaced_frame": true,
"media_type": "video",
"metadata": {},
"path": "G:\2018g-2018.09.27_14-31-54.m2t",
"pixel_format": 0,
"pixel_ratio": {
"den": 3,
"num": 4
},
"sample_rate": 48000,
"top_field_first": true,
"type": "FFmpegReader",
"vcodec": "mpeg2video",
"video_bit_rate": 3344886,
"video_length": "496",
"video_stream_index": 0,
"video_timebase": {
"den": 90000,
"num": 1
},
"width": 1440
}

[SuslikV]

Please post MediaInfo of the file in .txt format.

[Twenkid]

m1.txt
m2.txt

[SuslikV]

It looks, like first stream is menu, as far as I understand you run into the issue similar to #3302 .

Can you shoot and share smallest sample (.m2t format, about 2 sec long) with the both video and sound, so developers can test it?

[Twenkid]

http://twenkid.com/os/3.m2t

However I couldn't capture a fresh file right now, it's a "copy" of an excerpt by ffmpeg - the format seems kept and the sound issue is there, too. There is the ffmpeg's output if it's also suggestive.

BTW, the audio desync is kind of "normal" at least wherever I've captured from my camera both on Linux and Windows, this is shot with Canon HV30 and captured with dvgrab.

C:\...>ffmpeg -i G:\2018g-2018.09.27_14-30-33.m2t -t 3 -c:v copy -c:a cop
y g:\3.m2t
ffmpeg version git-2020-03-15-c467328 Copyright (c) 2000-2020 the FFmpeg develop
ers
  built with gcc 9.2.1 (GCC) 20200122
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfi
g --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libb
luray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enab
le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --e
nable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable
-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 -
-enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enab
le-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --en
able-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-ffnvcode
c --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvd
ec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
  libavutil      56. 42.100 / 56. 42.100
  libavcodec     58. 75.100 / 58. 75.100
  libavformat    58. 41.100 / 58. 41.100
  libavdevice    58.  9.103 / 58.  9.103
  libavfilter     7. 77.100 /  7. 77.100
  libswscale      5.  6.101 /  5.  6.101
  libswresample   3.  6.100 /  3.  6.100
  libpostproc    55.  6.100 / 55.  6.100
[mpeg2video @ 0000000000464280] Invalid frame dimensions 0x0.
    Last message repeated 10 times
[mpegts @ 0000000000460300] Could not find codec parameters for stream 2 (Unknow
n: none ([160][0][0][0] / 0x00A0)): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
[mpegts @ 0000000000460300] Could not find codec parameters for stream 3 (Unknow
n: none ([161][0][0][0] / 0x00A1)): unknown codec
Consider increasing the value for the 'analyzeduration' and 'probesize' options
Input #0, mpegts, from 'G:\2018g-2018.09.27_14-30-33.m2t':
  Duration: 00:00:09.34, start: 4183.512667, bitrate: 26878 kb/s
  Program 100
    Stream #0:0[0x810]: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420
p(tv, bt709, top first), 1440x1080 [SAR 4:3 DAR 16:9], 25000 kb/s, 29.97 fps, 29
.97 tbr, 90k tbn, 59.94 tbc
    Stream #0:1[0x814]: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, fl
tp, 384 kb/s
    Stream #0:2[0x815]: Unknown: none ([160][0][0][0] / 0x00A0)
    Stream #0:3[0x811]: Unknown: none ([161][0][0][0] / 0x00A1)
Output #0, mpegts, to 'g:\3.m2t':
  Metadata:
    encoder         : Lavf58.41.100
    Stream #0:0: Video: mpeg2video (Main) ([2][0][0][0] / 0x0002), yuv420p(tv, b
t709, top first), 1440x1080 [SAR 4:3 DAR 16:9], q=2-31, 25000 kb/s, 29.97 fps, 2
9.97 tbr, 90k tbn, 90k tbc
    Stream #0:1: Audio: mp2 ([3][0][0][0] / 0x0003), 48000 Hz, stereo, fltp, 384
 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame=   76 fps=0.0 q=-1.0 Lsize=    8195kB time=00:00:02.97 bitrate=22557.0kbit
s/s speed= 124x
video:7854kB audio:141kB subtitle:0kB other streams:0kB global headers:0kB muxin
g overhead: 2.506346%

[stale]

Thank you so much for submitting an issue to help improve OpenShot Video Editor. We are sorry about this, but this particular issue has gone unnoticed for quite some time. To help keep the OpenShot GitHub Issue Tracker organized and focused, we must ensure that every issue is correctly labelled and triaged, to get the proper attention.

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