[FFmpeg-user] Question about conversion (Transcoding)

Discussion:

2018-09-18 16:50:56 UTC

I have an mpeg2 file which I am trying to convert to a dvd iso.

I am using dvdauthor to do it.
dvdauthor says the file is not mpeg2 video compatible.

When I run ffprobe on the file, I get this

ffprobe /usr/tmp/title_3-09h31m23s.mpg
ffprobe version N-51556-ge278500 Copyright (c) 2007-2013 the FFmpeg
developers
built on Apr 4 2013 05:11:43 with gcc 4.6 (Debian 4.6.3-1)
configuration: --prefix=/root/ffmpeg-static/32bit --arch=x86_32
--extra-cflags='-m32 -I/root/ffmpeg-static/32bit/include -static'
--extra-ldflags='-m32 -L/root/ffmpeg-static/32bit/lib -static'
--extra-libs='-lxml2 -lexpat -lfreetype' --enable-static
--disable-shared --disable-ffserver --disable-doc --enable-bzlib
--enable-zlib --enable-postproc --enable-runtime-cpudetect
--enable-libx264 --enable-gpl --enable-libtheora --enable-libvorbis
--enable-libmp3lame --enable-gray --enable-libass --enable-libfreetype
--enable-libopenjpeg --enable-libspeex --enable-libvo-aacenc
--enable-libvo-amrwbenc --enable-version3 --enable-libvpx
libavutil 52. 24.100 / 52. 24.100
libavcodec 55. 2.100 / 55. 2.100
libavformat 55. 1.100 / 55. 1.100
libavdevice 55. 0.100 / 55. 0.100
libavfilter 3. 49.100 / 3. 49.100
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 2.100 / 52. 2.100
[mpeg @ 0xab1d7c0] max_analyze_duration 5000000 reached at 5024000
microseconds
[mpeg @ 0xab1d7c0] Could not find codec parameters for stream 1 (Audio:
ac3, 0 channels): unspecified sample format
Consider increasing the value for the 'analyzeduration' and 'probesize'
options
[NULL @ 0xab1e760] start time is not set in estimate_timings_from_pts
Input #0, mpeg, from '/usr/tmp/title_3-09h31m23s.mpg':
Duration: 02:10:42.11, start: 45337.301611, bitrate: 5391 kb/s
Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x480 [SAR
32:27 DAR 16:9], 29.97 fps, 59.92 tbr, 90k tbn, 59.94 tbc
Stream #0:1[0x20]: Audio: ac3, 0 channels
Stream #0:2[0x80]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s

So, how do I convert this file to a DVD compatible mpeg2 file?
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Kieran O Leary

2018-09-18 17:01:34 UTC

Permalink

Post by JD
I have an mpeg2 file which I am trying to convert to a dvd iso.
I am using dvdauthor to do it.
dvdauthor says the file is not mpeg2 video compatible.
When I run ffprobe on the file, I get this
ffprobe /usr/tmp/title_3-09h31m23s.mpg
ffprobe version N-51556-ge278500 Copyright (c) 2007-2013 the FFmpeg
developers
built on Apr 4 2013 05:11:43 with gcc 4.6 (Debian 4.6.3-1)
configuration: --prefix=/root/ffmpeg-static/32bit --arch=x86_32
--extra-cflags='-m32 -I/root/ffmpeg-static/32bit/include -static'
--extra-ldflags='-m32 -L/root/ffmpeg-static/32bit/lib -static'
--extra-libs='-lxml2 -lexpat -lfreetype' --enable-static
--disable-shared --disable-ffserver --disable-doc --enable-bzlib
--enable-zlib --enable-postproc --enable-runtime-cpudetect
--enable-libx264 --enable-gpl --enable-libtheora --enable-libvorbis
--enable-libmp3lame --enable-gray --enable-libass --enable-libfreetype
--enable-libopenjpeg --enable-libspeex --enable-libvo-aacenc
--enable-libvo-amrwbenc --enable-version3 --enable-libvpx
libavutil 52. 24.100 / 52. 24.100
libavcodec 55. 2.100 / 55. 2.100
libavformat 55. 1.100 / 55. 1.100
libavdevice 55. 0.100 / 55. 0.100
libavfilter 3. 49.100 / 3. 49.100
libswscale 2. 2.100 / 2. 2.100
libswresample 0. 17.102 / 0. 17.102
libpostproc 52. 2.100 / 52. 2.100
microseconds
ac3, 0 channels): unspecified sample format
Consider increasing the value for the 'analyzeduration' and 'probesize'
options

Something seems wrong with this stream.

Post by JD
Duration: 02:10:42.11, start: 45337.301611, bitrate: 5391 kb/s
Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p, 720x480 [SAR
32:27 DAR 16:9], 29.97 fps, 59.92 tbr, 90k tbn, 59.94 tbc
Stream #0:1[0x20]: Audio: ac3, 0 channels

Do you intend to have a zero channel ac3 file in here? If you remove it
when using the -map options, does dvdauthour still throw up the same error?

Best,

Kieran
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2018-09-18 18:38:15 UTC

Permalink

Post by Kieran O Leary
Hi

Something seems wrong with this stream.

Do you intend to have a zero channel ac3 file in here? If you remove it
when using the -map options, does dvdauthour still throw up the same error?
Best,
Kieran

I had copied it from an old source dvd from a friend
using one of the linux tools/utils,
Iike bombono-dvd or some such utility.
The dvd has long been lost. Perhaps he had
tossed it out to the trash by mistake.
But I want to play the file on a DVD player,
and thus wanted to convert it to dvd format.
So, I cannot re-create the file :(

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Reto Kromer

2018-09-18 18:21:59 UTC

Permalink

Post by JD
ffprobe version N-51556-ge278500 Copyright (c) 2007-2013 the
FFmpeg developers

This is a very old version! Please update to the latest release
or, even better, to the HEAD.

Best regards, Reto

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Carl Eugen Hoyos

2018-09-18 18:53:40 UTC

Permalink

Please try the following:
$ ffmpeg -i title_3-09h31m23s.mpg -target ntsc-dvd -acodec copy out.mpg

If it does not work, you can try to remove "-acodec copy".

Note that all dvd players I have seen also play the resulting
mpg file if I simply put it on a dvd (without using dvdauthor).

You could also test with "-acodec copy -vcodec copy" to
maximize quality.

Carl Eugen
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2018-09-18 19:26:00 UTC

Permalink

Post by Carl Eugen Hoyos

$ ffmpeg -i title_3-09h31m23s.mpg -target ntsc-dvd -acodec copy out.mpg
If it does not work, you can try to remove "-acodec copy".
Note that all dvd players I have seen also play the resulting
mpg file if I simply put it on a dvd (without using dvdauthor).
You could also test with "-acodec copy -vcodec copy" to
maximize quality.
Carl Eugen

Hi Carl,
Thank you for the tip.
I am getting the following output from ffmpeg:
seems to indicate some problem with my mpg file!!!
Notice that output file has -V2 in it's name
to indicate that it is version 2.

ffmpeg -i /usr/tmp/title_3-09h31m23s.mpg -target ntsc-dvd -acodec copy
-vcodec copy /usr/tmp/title_3-09h31m23s-V2.mpg
ffmpeg version N-88150-gae100046ca-static
https://johnvansickle.com/ffmpeg/ Copyright (c) 2000-2017 the FFmpeg
developers
built with gcc 6.4.0 (Debian 6.4.0-8) 20171010
configuration: --enable-gpl --enable-version3 --enable-static
--disable-debug --disable-ffplay --disable-indev=sndio
--disable-outdev=sndio --cc=gcc-6 --enable-fontconfig --enable-frei0r
--enable-gnutls --enable-gray --enable-libfribidi --enable-libass
--enable-libvmaf --enable-libfreetype --enable-libmp3lame
--enable-libopencore-amrnb --enable-libopencore-amrwb
--enable-libopenjpeg --enable-librubberband --enable-librtmp
--enable-libsoxr --enable-libspeex --enable-libvorbis --enable-libopus
--enable-libtheora --enable-libvidstab --enable-libvo-amrwbenc
--enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265
--enable-libxvid --enable-libzimg
libavutil 56. 0.100 / 56. 0.100
libavcodec 58. 0.100 / 58. 0.100
libavformat 58. 0.100 / 58. 0.100
libavdevice 58. 0.100 / 58. 0.100
libavfilter 7. 0.100 / 7. 0.100
libswscale 5. 0.100 / 5. 0.100
libswresample 3. 0.100 / 3. 0.100
libpostproc 55. 0.100 / 55. 0.100
[mpeg @ 0x48a3e80] start time for stream 1 is not set in
estimate_timings_from_pts
[mpeg @ 0x48a3e80] Could not find codec parameters for stream 1 (Audio:
ac3, 0 channels): unspecified sample format
Consider increasing the value for the 'analyzeduration' and 'probesize'
options
Input #0, mpeg, from '/usr/tmp/title_3-09h31m23s.mpg':
Duration: 02:10:42.14, start: 45337.301611, bitrate: 5391 kb/s
Stream #0:0[0x1e0]: Video: mpeg2video (Main), yuv420p(tv,
smpte170m, top first), 720x480 [SAR 32:27 DAR 16:9], Closed Captions,
29.97 fps, 59.94 tbr, 90k tbn, 59.94 tbc
Stream #0:1[0x20]: Audio: ac3, 0 channels
Stream #0:2[0x80]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s
[dvd @ 0x48ab2e0] VBV buffer size not set, using default size of 130KB
If you want the mpeg file to be compliant to some specification
Like DVD, VCD or others, make sure you set the correct buffer size
<<<<<< ??????
Output #0, dvd, to '/usr/tmp/title_3-09h31m23s-V2.mpg':
Metadata:
encoder : Lavf58.0.100
Stream #0:0: Video: mpeg2video (Main), yuv420p(tv, smpte170m, top
first), 720x480 [SAR 32:27 DAR 16:9], q=2-31, 6000 kb/s, 29.97 fps,
59.94 tbr, 90k tbn, 29.97 tbc
Stream #0:1: Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s
Stream mapping:
Stream #0:0 -> #0:0 (copy)
Stream #0:2 -> #0:1 (copy)
Press [q] to stop, [?] for help
[dvd @ 0x48ab2e0] Timestamps are unset in a packet for stream 0. This is
deprecated and will stop working in the future. Fix your code to set the
timestamps properly
[dvd @ 0x48ab2e0] Non-monotonous DTS in output stream 0:0; previous:
8882356, current: 8881224; changing to 8882357. This may result in
incorrect timestamps in the output file.
[dvd @ 0x48ab2e0] buffer underflow st=1 bufi=638 size=1792
frame=23976 fps=412 q=-1.0 size= 684302kB time=00:16:40.87
bitrate=5600.9kbits/s speed=17.2x

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Carl Eugen Hoyos

2018-09-18 20:31:13 UTC

Permalink

Post by JD
seems to indicate some problem with my mpg file!!!

Not necessarily: Does the output file work in your dvd player?

Carl Eugen
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2018-09-18 21:57:28 UTC

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Post by Carl Eugen Hoyos

Post by JD
seems to indicate some problem with my mpg file!!!

Not necessarily: Does the output file work in your dvd player?
Carl Eugen

I have not tried it yet, because it is still transcoding as per your
suggestion. Will reply to you again after I have tried it.

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2018-09-19 16:36:31 UTC

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Post by Carl Eugen Hoyos

Hi Carl,
Since it is a huge file (6GB), it is still transcoding
per your ffmpeg incantation.
I can only continue the operation for about 2 to 4 hours
per day, on an old and slow laptop.
So, before I suspend to disk, I "Control-Z" the program.
So far it has processed about 2.5GB.
But I WILL get back to you about how it turned out.

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Kieran O Leary

2018-09-19 16:45:04 UTC

Permalink

Post by JD

Post by Carl Eugen Hoyos

[SAR

Post by Carl Eugen Hoyos

Post by JD
32:27 DAR 16:9], 29.97 fps, 59.92 tbr, 90k tbn, 59.94 tbc
Stream #0:1[0x20]: Audio: ac3, 0 channels
Stream #0:2[0x80]: Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s
So, how do I convert this file to a DVD compatible mpeg2 file?

You can just add in -t 60 to Carl's command if you want to just process the
first minute and test if dvdauthor likes it or not?
ffmpeg -i title_3-09h31m23s.mpg -target ntsc-dvd -acodec copy -t 60
60sectest.mpg
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2018-10-03 15:04:32 UTC

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Post by Carl Eugen Hoyos

Hi Carl,
Sorry to say that I gave up on this project.
Very discouraging tools on my old linux machine.
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