Hi,
mine is at:
http://dev.adactus.no:10080/moviecutter/
maybe someone will see the bug (please use only with mp4 files). I'm
pretty sure that something is messed up in the way I'm handling (or NOT
handling) the global header for the mp4 file.
BTW I could'nt compile yours, make output:
fer...@dfl:~/work/sdrlive_src> make
cc -c -o main.o main.c
main.c: In function ‘main’:
main.c:78: warning: assignment makes pointer from integer without a cast
cc -c -o ffmpeg_ripoff.o ffmpeg_ripoff.c
gcc -o sdrlive main.o ffmpeg_ripoff.o -lavformat -lavcodec -lz
main.o: In function `main':
main.c:(.text+0x25e): undefined reference to `av_guess_format'
collect2: ld returned 1 exit status
make: *** [sdrlive] Error 1
Thanks,
Frc
On 05/05/2010 09:36 AM, Stoian Ivanov wrote:
On Wed, Apr 28, 2010 at 1:45 PM, Ferenc Deak<[email protected]> wrote:
Hi all,
I have the following situation here: I need to implement a small tool which
cuts the first X (10 or 20, 30, ...) seconds out of a movie clip, and writes
the result in a new file.
What I do is very similar to the initialization/opening phase from ffplay.c:
1. Open the file (av_open_input_file, av_find_stream_info)
2. Seek to the required position (avformat_seek_file)
3. Setup the codecs (including check for global headers
4. Create an output context (AVFormatContext based on AVOutputFormat)
5. Open the output file (url_fopen)
6. Write the output header
7. loop starts: read a packet from the input file (av_read_frame)
8. modify the packet's time to be zero based (PTS, DTS)
9. write the packet to the output
10. go to 7 if we have more packets to read
11. write_trailer, close the files.
12. done
Now, here comes the problem. It has a small "bug" (probably in the logic) :
after the app runs and "cuts" the file it seems that the players don't see
the video stream anymore, so they display the first video frame and after
this only the audio is being played. I have included a small logger, and if
I run my cutter application once more, it sees only the audio frames... In
ffplay I open the file and it plays the audio nicely, the first video frame
is frozen on the screen, but if I click somewhere on the ffplay window
(meaning: seek) it seeks there, starts playing the video only. NO audio
frames are there anymore ... Step 8 is not responsible for this stupid
behavior, it behaves the same way if it's there or not.
Have you ever seen this behavior? Had anyone of you implemented this cut out
feature?
Thanks
Ferenc
I got similar task but totally different problems - i loose the audio
:( and the file doubles it's size. If interested my code is at
http://sdr.tera-com.com/tmp/sdrlive_src.tar.bz2
and I'm much interested in yours
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