Sorry I forgot to include the commands and console output in my previous
message. They are below.
And here is the audio stream information from the mp4 of this file
when I remux it now using the same command, which does not play:
Stream #0:1(und): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
stereo, fltp, 256 kb/s (default)
Here is the command and console output when the (non-functional) mp4
file is created from the original MTS file:
```
$ ffmpeg -i /Volumes/Untitled/private/AVCHD/BDMV/STREAM/00006.MTS
-vcodec copy -acodec copy ./00006.mp4
ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
configuration: --prefix=/opt/local --enable-swscale --enable-avfilter
--enable-avresample --enable-libmp3lame --enable-libvorbis
--enable-libopus --enable-librsvg --enable-libtheora
--enable-libopenjpeg --enable-libmodplug --enable-libvpx
--enable-libsoxr --enable-libspeex --enable-libass --enable-libbluray
--enable-lzma --enable-gnutls --enable-fontconfig --enable-libfreetype
--enable-libfribidi --disable-jack --disable-libopencore-amrnb
--disable-libopencore-amrwb --disable-libxcb --disable-libxcb-shm
--disable-libxcb-xfixes --disable-indev=jack --enable-opencl
--disable-outdev=xv --enable-audiotoolbox --enable-videotoolbox
--enable-sdl2 --mandir=/opt/local/share/man --enable-shared
--enable-pthreads --cc=/usr/bin/cc --arch=x86_64 --enable-x86asm
--enable-libx265 --enable-gpl --enable-postproc --enable-libx264
--enable-libxvid --enable-nonfree --enable-libfdk-aac
libavutil 55. 78.100 / 55. 78.100
libavcodec 57.107.100 / 57.107.100
libavformat 57. 83.100 / 57. 83.100
libavdevice 57. 10.100 / 57. 10.100
libavfilter 6.107.100 / 6.107.100
libavresample 3. 7. 0 / 3. 7. 0
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100
Input #0, mpegts, from
'/Volumes/Untitled/private/AVCHD/BDMV/STREAM/00006.MTS':
Duration: 00:00:10.56, start: 2208.672200, bitrate: 15090 kb/s
Program 1
Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448),
yuv420p(top first), 1920x1080 [SAR 1:1 DAR 16:9], 29.97 fps, 59.94 tbr,
90k tbn, 59.94 tbc
Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
stereo, fltp, 256 kb/s
[mp4 @ 0x7f9f8a000600] track 1: codec frame size is not set
Output #0, mp4, to './00006.mp4':
Metadata:
encoder : Lavf57.83.100
Stream #0:0: Video: h264 (High) (avc1 / 0x31637661), yuv420p(top
first), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 29.97 fps, 59.94 tbr, 90k
tbn, 90k tbc
Stream #0:1: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo,
fltp, 256 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 630 fps=0.0 q=-1.0 Lsize= 18499kB time=00:00:10.52
bitrate=14394.4kbits/s speed=30.8x
video:18155kB audio:330kB subtitle:0kB other streams:0kB global
headers:0kB muxing overhead: 0.073744%
```
If I first do what should be a vacuous remux of the MTS file with
ffmpeg -i [INPUT_MTS_FILE] -acodec copy -vcodec copy [OUTPUT_MTS_FILE]
the resulting MTS file has the following audio stream information:
Stream #0:1[0x101]: Audio: ac3 ([129][0][0][0] / 0x0081), 48000
Hz, stereo, fltp, 256 kb/s
Command and console output for the (vacuously?) remuxed MTS file:
```
$ ffmpeg -i /Volumes/Untitled/private/AVCHD/BDMV/STREAM/00006.MTS
-vcodec copy -acodec copy ./00006-remuxed.MTS
ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
configuration: --prefix=/opt/local --enable-swscale --enable-avfilter
--enable-avresample --enable-libmp3lame --enable-libvorbis
--enable-libopus --enable-librsvg --enable-libtheora
--enable-libopenjpeg --enable-libmodplug --enable-libvpx
--enable-libsoxr --enable-libspeex --enable-libass --enable-libbluray
--enable-lzma --enable-gnutls --enable-fontconfig --enable-libfreetype
--enable-libfribidi --disable-jack --disable-libopencore-amrnb
--disable-libopencore-amrwb --disable-libxcb --disable-libxcb-shm
--disable-libxcb-xfixes --disable-indev=jack --enable-opencl
--disable-outdev=xv --enable-audiotoolbox --enable-videotoolbox
--enable-sdl2 --mandir=/opt/local/share/man --enable-shared
--enable-pthreads --cc=/usr/bin/cc --arch=x86_64 --enable-x86asm
--enable-libx265 --enable-gpl --enable-postproc --enable-libx264
--enable-libxvid --enable-nonfree --enable-libfdk-aac
libavutil 55. 78.100 / 55. 78.100
libavcodec 57.107.100 / 57.107.100
libavformat 57. 83.100 / 57. 83.100
libavdevice 57. 10.100 / 57. 10.100
libavfilter 6.107.100 / 6.107.100
libavresample 3. 7. 0 / 3. 7. 0
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100
Input #0, mpegts, from
'/Volumes/Untitled/private/AVCHD/BDMV/STREAM/00006.MTS':
Duration: 00:00:10.56, start: 2208.672200, bitrate: 15090 kb/s
Program 1
Stream #0:0[0x1011]: Video: h264 (High) (HDMV / 0x564D4448),
yuv420p(top first), 1920x1080 [SAR 1:1 DAR 16:9], 29.97 fps, 59.94 tbr,
90k tbn, 59.94 tbc
Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
stereo, fltp, 256 kb/s
Output #0, mpegts, to './00006-remuxed.MTS':
Metadata:
encoder : Lavf57.83.100
Stream #0:0: Video: h264 (High) (HDMV / 0x564D4448), yuv420p(top
first), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 29.97 fps, 59.94 tbr, 90k
tbn, 90k tbc
Stream #0:1: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz, stereo,
fltp, 256 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 630 fps=0.0 q=-1.0 Lsize= 20029kB time=00:00:10.52
bitrate=15585.0kbits/s speed= 155x
video:18155kB audio:330kB subtitle:0kB other streams:0kB global
headers:0kB muxing overhead: 8.351021%
```
And when I remux *this* file into an mp4 container, the resulting file
plays fine, and has the same audio stream as the file created last
year:
Stream #0:1(und): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz,
stereo, fltp, 256 kb/s (default)
Command and console output for the (functioning) mp4 file remuxed from
the remuxed MTS file:
```
$ ffmpeg -i ./00006-remuxed.MTS -vcodec copy -acodec copy
./00006-remuxed.mp4
ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
configuration: --prefix=/opt/local --enable-swscale --enable-avfilter
--enable-avresample --enable-libmp3lame --enable-libvorbis
--enable-libopus --enable-librsvg --enable-libtheora
--enable-libopenjpeg --enable-libmodplug --enable-libvpx
--enable-libsoxr --enable-libspeex --enable-libass --enable-libbluray
--enable-lzma --enable-gnutls --enable-fontconfig --enable-libfreetype
--enable-libfribidi --disable-jack --disable-libopencore-amrnb
--disable-libopencore-amrwb --disable-libxcb --disable-libxcb-shm
--disable-libxcb-xfixes --disable-indev=jack --enable-opencl
--disable-outdev=xv --enable-audiotoolbox --enable-videotoolbox
--enable-sdl2 --mandir=/opt/local/share/man --enable-shared
--enable-pthreads --cc=/usr/bin/cc --arch=x86_64 --enable-x86asm
--enable-libx265 --enable-gpl --enable-postproc --enable-libx264
--enable-libxvid --enable-nonfree --enable-libfdk-aac
libavutil 55. 78.100 / 55. 78.100
libavcodec 57.107.100 / 57.107.100
libavformat 57. 83.100 / 57. 83.100
libavdevice 57. 10.100 / 57. 10.100
libavfilter 6.107.100 / 6.107.100
libavresample 3. 7. 0 / 3. 7. 0
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100
Input #0, mpegts, from './00006-remuxed.MTS':
Duration: 00:00:10.56, start: 1.400000, bitrate: 15542 kb/s
Program 1
Metadata:
service_name : Service01
service_provider: FFmpeg
Stream #0:0[0x100]: Video: h264 (High) ([27][0][0][0] / 0x001B),
yuv420p(top first), 1920x1080 [SAR 1:1 DAR 16:9], 29.97 fps, 59.94 tbr,
90k tbn, 59.94 tbc
Stream #0:1[0x101]: Audio: ac3 ([129][0][0][0] / 0x0081), 48000 Hz,
stereo, fltp, 256 kb/s
[mp4 @ 0x7ff4d1813200] track 1: codec frame size is not set
Output #0, mp4, to './00006-remuxed.mp4':
Metadata:
encoder : Lavf57.83.100
Stream #0:0: Video: h264 (High) (avc1 / 0x31637661), yuv420p(top
first), 1920x1080 [SAR 1:1 DAR 16:9], q=2-31, 29.97 fps, 59.94 tbr, 90k
tbn, 90k tbc
Stream #0:1: Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz, stereo,
fltp, 256 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
frame= 630 fps=0.0 q=-1.0 Lsize= 18499kB time=00:00:10.52
bitrate=14394.4kbits/s speed= 167x
video:18155kB audio:330kB subtitle:0kB other streams:0kB global
headers:0kB muxing overhead: 0.073744%
```
Thanks in advance for any insight or help with this! Please let me know
if I can provide more information.
Best,
Galen
On 18 Feb 2018, at 9:02, Galen Menzel wrote:
Hi all,
I have been using ffmpeg regularly for a couple years to remux MTS
files from my video camera into mp4 files. I use the following simple
command:
```
ffmpeg -i [MTS_FILE] -acodec copy -vcodec copy [MP4_FILE]
```
Although the command I use hasn’t changed, recently this has stopped
working. The resulting mp4 now contains an audio stream in a format
that VLC (and Quicktime Player) can’t play. (VLC gives the following
error: `VLC could not decode the format "AC-3" (No description for
this codec)`)
Concretely, here is the audio stream information of an MTS file I’m
working with, which plays just fine:
Stream #0:1[0x1100]: Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
stereo, fltp, 256 kb/s
Here is the audio stream information from the mp4 of this file, which
I remuxed last year, and which also plays fine:
Stream #0:1(und): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz,
stereo, fltp, 256 kb/s (default)
And here is the audio stream information from the mp4 of this file
when I remux it now using the same command, which does not play:
Stream #0:1(und): Audio: ac3 (AC-3 / 0x332D4341), 48000 Hz,
stereo, fltp, 256 kb/s (default)
As you can see, the file that I get now has the same encoding as the
MTS file, but does not play, even though the MTS file does. And the
file I generated last year has a different audio encoding (even though
the commands that created these files were identical), but it plays
fine.
If I first do what should be a vacuous remux of the MTS file with
ffmpeg -i [INPUT_MTS_FILE] -acodec copy -vcodec copy [OUTPUT_MTS_FILE]
the resulting MTS file has the following audio stream information:
Stream #0:1[0x101]: Audio: ac3 ([129][0][0][0] / 0x0081), 48000
Hz, stereo, fltp, 256 kb/s
And when I remux *this* file into an mp4 container, the resulting file
plays fine, and has the same audio stream as the file created last
year:
Stream #0:1(und): Audio: ac3 (ac-3 / 0x332D6361), 48000 Hz,
stereo, fltp, 256 kb/s (default)
But I would really rather not remux everything twice.
I am using the following version of ffmpeg, which I installed with
macports:
```
ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
built with Apple LLVM version 9.0.0 (clang-900.0.39.2)
configuration: --prefix=/opt/local --enable-swscale --enable-avfilter
--enable-avresample --enable-libmp3lame --enable-libvorbis
--enable-libopus --enable-librsvg --enable-libtheora
--enable-libopenjpeg --enable-libmodplug --enable-libvpx
--enable-libsoxr --enable-libspeex --enable-libass --enable-libbluray
--enable-lzma --enable-gnutls --enable-fontconfig --enable-libfreetype
--enable-libfribidi --disable-jack --disable-libopencore-amrnb
--disable-libopencore-amrwb --disable-libxcb --disable-libxcb-shm
--disable-libxcb-xfixes --disable-indev=jack --enable-opencl
--disable-outdev=xv --enable-audiotoolbox --enable-videotoolbox
--enable-sdl2 --mandir=/opt/local/share/man --enable-shared
--enable-pthreads --cc=/usr/bin/cc --arch=x86_64 --enable-x86asm
--enable-libx265 --enable-gpl --enable-postproc --enable-libx264
--enable-libxvid --enable-nonfree --enable-libfdk-aac
libavutil 55. 78.100 / 55. 78.100
libavcodec 57.107.100 / 57.107.100
libavformat 57. 83.100 / 57. 83.100
libavdevice 57. 10.100 / 57. 10.100
libavfilter 6.107.100 / 6.107.100
libavresample 3. 7. 0 / 3. 7. 0
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100
```
This is the first time I’ve noticed this issue, but the last time I
remuxed files (with no issue) was last October, so this has manifested
sometime in the last four months or so.
Does anyone have any ideas as to what is going on here? What do these
various name/number pairs for the ac3 encoding mean? (e.g., `ac-3 /
0x332D6361` vs `AC-3 / 0x332D4341` vs `[129][0][0][0] / 0x0081`. I’d
appreciate any help or insight on this issue.
Thanks!
Best regards,
Galen
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