a q about units

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a q about units

Jim Shupert, Jr.-2
Friends
This is a rather general Q

when I see dialogue such as
[matroska,webm @ 0x7f362c000b80] Read error at pos. 59270674468
(0xdccceb824)

as in

Input #0, matroska,webm, from 'pipe:':
Metadata:
ENCODER : Lavf58.29.100
Duration: N/A, start: 0.000000, bitrate: 12288 kb/s
Stream #0:0: Audio: pcm_s32le, 48000 Hz, 8 channels, s32, 12288 kb/s
(default)
Stream #0:1: Video: v210 (V210 / 0x30313256), yuv422p10le(bottom first),
720x486, 29.97 fps, 29.97 tbr, 1k tbn, 1k tbc (default)
[matroska,webm @ 0x7f362c000b80] Read error at pos. 59270674468
(0xdccceb824)
[matroska,webm @ 0x7f362c000b80] Seek to desired resync point failed.
Seeking to earliest point available instead.
[matroska,webm @ 0x7f362c000b80] Read error at pos. 59270674468
(0xdccceb824)

av_interleaved_write_frame(): Broken pipe
Error writing trailer of pipe:: Broken pipe
frame=60212 fps= 30 q=-0.0 Lq=-1.0 size=25924529kB time=00:33:29.04
bitrate=105709.0kbits/s speed= 1x
video:80224393kB audio:3578653kB subtitle:0kB other streams:0kB global
headers:0kB muxing

MY Q
what is position 59270674468 (0xdccceb824)  ?
what are the units of 59270674468?

thanks
jS
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Re: a q about units

Kieran O Leary
Hi,

On Thu, Jun 11, 2020 at 6:38 PM Jim Shupert <[hidden email]>
wrote:

> Friends
> This is a rather general Q
>
> when I see dialogue such as
> [matroska,webm @ 0x7f362c000b80] Read error at pos. 59270674468
> (0xdccceb824)
>
> as in
>
> Input #0, matroska,webm, from 'pipe:':
> Metadata:
> ENCODER : Lavf58.29.100
> Duration: N/A, start: 0.000000, bitrate: 12288 kb/s
> Stream #0:0: Audio: pcm_s32le, 48000 Hz, 8 channels, s32, 12288 kb/s
> (default)
> Stream #0:1: Video: v210 (V210 / 0x30313256), yuv422p10le(bottom first),
> 720x486, 29.97 fps, 29.97 tbr, 1k tbn, 1k tbc (default)
> [matroska,webm @ 0x7f362c000b80] Read error at pos. 59270674468
> (0xdccceb824)
> [matroska,webm @ 0x7f362c000b80] Seek to desired resync point failed.
> Seeking to earliest point available instead.
> [matroska,webm @ 0x7f362c000b80] Read error at pos. 59270674468
> (0xdccceb824)
>
> av_interleaved_write_frame(): Broken pipe
> Error writing trailer of pipe:: Broken pipe
> frame=60212 fps= 30 q=-0.0 Lq=-1.0 size=25924529kB time=00:33:29.04
> bitrate=105709.0kbits/s speed= 1x
> video:80224393kB audio:3578653kB subtitle:0kB other streams:0kB global
> headers:0kB muxing
>
> MY Q
> what is position 59270674468 (0xdccceb824)  ?
> what are the units of 59270674468?
>

No idea, I'd like to know as well though. Here's the code that generates
these messages:
https://github.com/FFmpeg/FFmpeg/blob/ff3fad6b0edb13dd664403b01bc00309f035b110/libavformat/matroskadec.c#L890


Best,

Kieran O'Leary
Irish Film Institute
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Re: a q about units

Gyan Doshi-2


On 16-06-2020 03:26 pm, Kieran O Leary wrote:

> Hi,
>
> On Thu, Jun 11, 2020 at 6:38 PM Jim Shupert <[hidden email]>
> wrote:
>
>> Friends
>> This is a rather general Q
>>
>> when I see dialogue such as
>> [matroska,webm @ 0x7f362c000b80] Read error at pos. 59270674468
>> (0xdccceb824)
>>
>> as in
>>
>> Input #0, matroska,webm, from 'pipe:':
>> Metadata:
>> ENCODER : Lavf58.29.100
>> Duration: N/A, start: 0.000000, bitrate: 12288 kb/s
>> Stream #0:0: Audio: pcm_s32le, 48000 Hz, 8 channels, s32, 12288 kb/s
>> (default)
>> Stream #0:1: Video: v210 (V210 / 0x30313256), yuv422p10le(bottom first),
>> 720x486, 29.97 fps, 29.97 tbr, 1k tbn, 1k tbc (default)
>> [matroska,webm @ 0x7f362c000b80] Read error at pos. 59270674468
>> (0xdccceb824)
>> [matroska,webm @ 0x7f362c000b80] Seek to desired resync point failed.
>> Seeking to earliest point available instead.
>> [matroska,webm @ 0x7f362c000b80] Read error at pos. 59270674468
>> (0xdccceb824)
>>
>> av_interleaved_write_frame(): Broken pipe
>> Error writing trailer of pipe:: Broken pipe
>> frame=60212 fps= 30 q=-0.0 Lq=-1.0 size=25924529kB time=00:33:29.04
>> bitrate=105709.0kbits/s speed= 1x
>> video:80224393kB audio:3578653kB subtitle:0kB other streams:0kB global
>> headers:0kB muxing
>>
>> MY Q
>> what is position 59270674468 (0xdccceb824)  ?
>> what are the units of 59270674468?
>>
> No idea, I'd like to know as well though. Here's the code that generates
> these messages:
> https://github.com/FFmpeg/FFmpeg/blob/ff3fad6b0edb13dd664403b01bc00309f035b110/libavformat/matroskadec.c#L890

It's byte offset from start of data stream.

Gyan
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Re: a q about units

Jim Shupert, Jr.-2

> It's byte offset from start of data stream.
>
> Gyan

Good info fellas

also I find related info from Gyan at
https://superuser.com/questions/1512575/why-total-frame-count-is-different-in-ffmpeg-than-ffprobe/1512583#1512583

Thanks again Gyan

and
https://stackoverflow.com/questions/3032929/problem-ffmpeg-seeking-with-av-seek-frame-using-byte-positions/11496937

https://stackoverflow.com/questions/13855533/how-to-decode-video-data-from-specific-position-in-byte

in short , as I *understand* it:  one tends to seek to the nearest full
frame at a given byte position

cheers

jShupert
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