Rely on frame_count. Also more consistent with audio path.

Fixes use of the example with encoders which use tha AVFrame w/h/pix_fmt fields
FFV1 is one of these codecs

We cannot easily workaround the not set fields in common code because the API
has AVFrame constant for the encoders.
Alternatives would be to fix the API or to duplicate the struct and fill in
missing fields. Or as is to require all user apps to set this correctly and
maybe simplify for that case

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

In particular, fix trac ticket #3231.

Simplify logic, avoid multiple unnecessary alloc/free operations.

Fix PTS set on the frame when encoding, which must be specified in the
encoder timebase or this will confuse the encoder.

When muxing the packet, the PTS/DTS generated by the encoder is then
rescaled to the stream timebase.

Avoid the need of tweaking, also show how to get list of supported sample
formats.

- do not allocate resample dst buffer when resample is off
  - free sample buffers in addition to freeing data pointer arrays

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

We generate S16 samples and we should allocate the right buffer

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Hi list! Since my last patch (fix 2 memleaks in doc/examples/muxing.c)
I found more problems to fix.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Allows to encode to output in case the destination sample format is
different from AV_SAMPLE_FMT_S16.

The new name is less confusing, since the variables represent times
rather than timestamps.

Simpler and less confusing.

Do not re-call avcodec_get_context_defaults3(), it is already
called by avformat_new_stream() and it leaks the codec
priv_data that was already allocated.

Use avformat_free_context() instead of freeing (not)
everything manually.

Fix trac ticket #2322.

Illustrate the use of return values, av_err2str and
avcodec_get_name.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Factorize.

Fix crash in case frame is not defined (e.g. with muxing out.wav).

The API was never changed since 2003. Replace with a comment about the
performed operation.

Fixes Ticket1801
Based on suggestion from AztecC
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

The new name is more consistent with the codebase, and more
self-consistent with the libswscale API.

Favor the use of plain AVPicture over AVFrame, especially when the use of
AVFrame is not required like in the case of tmp_picture.

Also adopt more straightforward names, to avoid frame/picture confusion.

Fix warnings:
muxing.c: In function ‘write_video_frame’:
muxing.c:326:23: warning: passing argument 2 of ‘sws_scale’ from incompatible pointer type [enabled by default]

Make add_{audio,video}_stream return the found codec, and pass it to
avcodec_open2() through open_{audio,video} functions.

Fix failure:
No codec provided to avcodec_open2().
could not open codec

This is also consistent with the use of the avcodec_open2() API in the
codebase.

Use avpicture_alloc() high level function.

All the other examples already use the system installed headers.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

The suffix is redundant since the containing directory itself is
called "examples". Simplify.

Rename:
api-example.c    -> encoding-example.c
output-example.c -> muxing-example.c