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
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