The output file fopen() result is not checked. If it fails (e.g.
permission denied or invalid path), output_file is NULL and the
subsequent fwrite() call will crash.
Add a NULL check with an error message, consistent with the
existing error handling pattern in this example.
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>
avcodec_get_supported_config() is called with dec_ctx (the decoder
context) to query supported pixel formats and sample formats, but
the intent is to configure the encoder. The decoder supported
format list may differ from the encoder, leading to format
negotiation failures or incorrect output.
Pass enc_ctx instead so the actual encoder capabilities are
queried.
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>
encode_write() mapped all return values from avcodec_receive_packet()
into 0 or -1, which destroyed the AVERROR_EOF signal needed by the
caller. The flush call in main() could never see AVERROR_EOF, so a
successful encode always exited with a non-zero status.
Let encode_write() return the original error code and have each
call site handle the expected status:
- Encoding loop: ignore AVERROR(EAGAIN) (need more input)
- Flush path: ignore AVERROR_EOF (normal end-of-stream)
This makes the control flow explicit and easier to follow for
anyone reading the example.
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>
The cleanup path uses `ofmt->flags` to check AVFMT_NOFILE, but
`ofmt` is only assigned after avformat_alloc_output_context2
succeeds. If a failure occurs between output context allocation
and the `ofmt` assignment (e.g. stream_mapping allocation fails),
ofmt_ctx is non-NULL while ofmt is still NULL, causing a crash.
Use ofmt_ctx->oformat->flags instead, which is always valid when
ofmt_ctx is non-NULL.
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>
The sample generation loop hardcodes a stride of 2 (stereo) with
samples[2*j], but the channel count is dynamically selected by
select_channel_layout() which picks the layout with the highest
channel count. If the encoder supports more than 2 channels,
samples will be written at wrong offsets.
Use c->ch_layout.nb_channels as the stride instead.
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>
The output loop used sw_frame->width as the write size for all
planes. This is only correct for NV12 where the interleaved UV
plane happens to have the same byte width as the Y plane. For
other pixel formats (e.g. YUV420P where U/V planes are half
width, or P010 where samples are 2 bytes), the output would be
corrupted.
Use av_image_get_linesize() to compute the correct byte width
for each plane based on the actual pixel format.
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>
fwrite() returns size_t (unsigned), so comparing its return value
with < 0 is always false and write errors are silently ignored.
Check against the expected byte count instead.
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>
pgm_save() passes the FILE pointer from fopen() directly to
fprintf() and fwrite() without a NULL check. If fopen() fails
(e.g. permission denied or disk full), this causes a NULL pointer
dereference and crash.
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>
fopen() with "r" opens the file in text mode, which on Windows
translates \r\n to \n, corrupting raw NV12 pixel data. Use "rb"
to open in binary mode, matching the output file which already
uses "w+b".
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>
avformat_close_input() is designed for input format contexts only.
Using it on output contexts is API misuse — it accesses iformat
(which is NULL for output contexts) and does not follow the correct
output cleanup path.
Replace with the proper pattern already used in remux.c and
transcode.c: avio_closep() to close the IO handle, followed by
avformat_free_context() to free the format context.
Signed-off-by: Jun Zhao <barryjzhao@tencent.com>
Another step towards a cleaner API, with a cleaner separation of purposes.
Also avoids wasting a whopping one third of the flag space on what really
shouldn't have been a flag to begin with.
I pre-emptively decided to separate the scaler selection between "scaler"
and "scaler_sub", the latter defining what's used for things like 4:2:0
subsampling.
This allows us to get rid of the awkwardly defined SWS_BICUBLIN flag, in favor
of that just being the natural consequence of using a different scaler_sub.
Lastly, I also decided to pre-emptively axe the poorly defined and
questionable SWS_X scaler, which I doubt ever saw much use. The old flag
is still available as a deprecated flag, anyhow.
Sponsored-by: Sovereign Tech Fund
Signed-off-by: Niklas Haas <git@haasn.dev>
Some video codecs are not meant to output frames on their own but to be applied
on top of frames generated by other codecs, as is the case of LCEVC, Dolby Vision,
etc. Add a codec prop to signal this kind of codec, so that library users may know
to not expect a standalone decoder for them to be present.
Signed-off-by: James Almer <jamrial@gmail.com>
It is only used by the MPEG-2 encoder, so replace it
by a private option instead. Use a more elaborate term
for it: intra_dc_precision ("dc" could be anything).
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Clarify the behavior of seek keyboard shortcuts in both the
documentation and command-line help text. Specifically:
- left/right: mention custom interval option support
- page down/up: improve wording for chapter seeking fallback
This commit introduces new options to support more than one decryption
keys:
* add a decryption_keys option to MOV, that supports a dictionary of
KID=>key (in hex), using AV_OPT_TYPE_DICT
* add the corresponding cenc_decryption_keys option to DASH
Signed-off-by: Kacper Michajłow <kasper93@gmail.com>
It has come to my attention that a way to limit the request range size
would be useful in general, for reasons beyond just speeding up initial
header parsing.
This patch generalizez -initial_request_size to -request_size. I decided
to continue allowing both options to be used simultaneously, so users can
e.g. set -request_size to something large like 10 MiB, but still use a smaller
size for initial header parsing (e.g. 256 KiB).
Fixes: https://github.com/mpv-player/mpv/issues/8655
Allows users to test if a given hardware pixel format is supported by swscale.
This is only a rough heuristic anyways, because the actual support may
depend on the specific *combination* of frame attributes, and ultimately
is better served by the `sws_test_frame` and `sws_frame_setup()` APIs anyways.
Sponsored-by: Sovereign Tech Fund
Signed-off-by: Niklas Haas <git@haasn.dev>
loudnorm provides stats output that's meant to be used for two-pass
normalization. These stats are often interleaved with ffmpeg's stream
descriptions and other output, making them difficult to parse and pass
to the second pass. The new stats_file option enables writing the stats
to a separate file, or to standard output, for simple parsing and other
programmatic usage.
Signed-off-by: Adam Jensen <adam@acj.sh>
Said function has presumably been added in order to check
that we have successfully reset the floating point state
after having violated the ABI/calling convention by not
issuing emms in our MMX DSP routines.
Yet the ability to check this should not have been made public,
because there is no external need for it and because the
function does not even always achieve what its documentation
claims to do: It only works when inline assembly is available.
It should have been implemented in emms.h like emms_c()
(which is where a replacement should be put if there is still
ABI-violating MMX code when av_assert0_fpu() is removed).
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Sometimes, HTTP sources require a lot of seeking during probing / header
parsing (especially for formats like MXF). Currently, we need to completely
tear down and re-establish the connection most times this happens, which puts
a lot of stress on the network stack and also results in transmission of
possibly many unnecessary bytes.
This patch adds an option to allow FFmpeg to request partial ranges during
the initialization stage. This is done until the initial request size is fully
read, after which we fall back to the normal behavior (i.e. infinite streaming
via an unbounded request).
The usefulness of this is limited without also specifying -multiple_requests 1,
since otherwise there is little point to requesting partial ranges to begin
with. (However, it is semantically independent, so we keep it that way.)
Add chroma_location option so that, in the subsampled-to-subsampled case, the destination's chroma siting can be changed from the source's without having to use other filters. Useful, for example, when converting BT.2020 to BT.709, where the former customarily uses "top left" and the latter "left."
Update documentation.
Closes: #21185
Add support for standard -pass and -passlogfile options, matching the behavior
of libx264.
Add the -x265-stats option to specify the stats filename.
Update documentation.
Signed-off-by: Werner Robitza <werner.robitza@gmail.com>
When prescale is enabled, time fields are converted to the output
timebase before expression evaluation. This allows option specification
even if the input timebase is unknown.
