[FFmpeg-devel] $250 to fix FLV cutting bug (STILL OPEN)
Cyrus A
lists
Wed Jul 18 02:06:43 CEST 2007
Panagiotis Issaris wrote:
> Hi Cyrus,
>
> Cyrus A wrote:
>
>> Cyrus A wrote:
>>
>>
>>> Piero Bugoni wrote:
>>>
>>>
>>>
>>>>> I'm trying to cut a small portion out of a larger
>>>>> FLV file. I have an
>>>>> FLV file that is 156 seconds long. The command...
>>>>>
>>>>> ffmpeg -ss 6 -t 100 -y -vcodec copy -acodec copy -i
>>>>> /home/cyrus/Desktop/test.flv
>>>>> /home/cyrus/Desktop/cut.flv
>>>>>
>>>>> ...should create a file that is 94 seconds long
>>>>> (seeking 6 seconds,
>>>>> duration for 100 seconds). Instead, it creates a
>>>>> file 150 seconds long.
>>>>> That is, it seems to be seeking for 6 seconds, then
>>>>> giving me the rest
>>>>> of the clip. Any ideas why that's happening?
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>> Maybe the -ss and -t options are exclusive of each
>>>> other.
>>>>
>>>> Have you tries the -vframes option? If you know the
>>>> number of frames you want, try specifying that, and
>>>> maybe it will give you just the frames you want.
>>>>
>>>> This probably belongs in ffmpeg.user.
>>>>
>>>> If I figure it out for you, I'll post it there.
>>>>
>>>> P.
>>>>
>>>>
>>>>
>>>>
>>> Thanks for taking a look. I don't think this belongs on ffmpeg-user. I
>>> use the "-ss seek -t duration" combo extensively on other file formats
>>> (mostly DivX 5.0 MPEG-4 AVI) and it works great (99% of the time). There
>>> is obviously a bug here with FLVs.
>>>
>>> I'll let you know if I get any private responses and find a fix.
>>>
>>> Cyrus
>>>
>>>
>>>
>> The donation is now $250 to fix the bug.
>>
>> Sorry to turn this list into elance.com. Look at it as further evidence
>> of ffmpeg's commercial viability!
>>
>>
>
> Can you try the attached patch?
>
> flvdec.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> With friendly regards,
> Takis
>
Hi everybody.
Unfortunately, that patch did not work. Here is the output:
ffmpeg -ss 10 -t 100 -y -vcodec copy -acodec copy -i
/home/cyrus/Desktop/test.flv /home/cyrus/Desktop/cut.flv
FFmpeg version SVN-r9725, Copyright (c) 2000-2007 Fabrice Bellard, et al.
configuration: --enable-libmp3lame
libavutil version: 49.4.1
libavcodec version: 51.40.4
libavformat version: 51.12.1
built on Jul 17 2007 19:39:22, gcc: 4.1.1 20070105 (Red Hat 4.1.1-51)
Input #0, flv, from '/home/cyrus/Desktop/test.flv':
Duration: 00:02:36.0, start: 0.000000, bitrate: N/A
Stream #0.0: Video: flv, yuv420p, 480x384, 25.00 fps(r)
Stream #0.1: Audio: mp3, 44100 Hz, stereo
Output #0, flv, to '/home/cyrus/Desktop/cut.flv':
Stream #0.0: Video: flv, yuv420p, 480x384, q=2-31, 25.00 fps(c)
Stream #0.1: Audio: libmp3lame, 44100 Hz, stereo
Stream mapping:
Stream #0.0 -> #0.0
Stream #0.1 -> #0.1
Press [q] to stop encoding
frame= 3297 fps= 0 q=0.0 Lsize= 4532kB time=100.0 bitrate=
371.2kbits/s
video:3554kB audio:860kB global headers:0kB muxing overhead 2.664062%
While ffmpeg says it is a 100-sec video in duration, mplayer does not
play the file as anticipated. For starters, the seek did not happen. The
audio I hear is from the very beginning of the original clip. The video
I see starts from the first frame of the original clip and moves in
ultra-slow motion (looks like 1 frame per second). Mplayer reports the
current position of the file as 04:39:27 and counts up while reporting
the entire show is 01:13:09. It goes without saying mplayer is confused
as hell about something.
I have uploaded my source FLV to http://hq.dynalias.com/test.flv .
Please grab it there and test.
Thanks for trying. I really appreciate the responses.
Cyrus
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