64 fprintf(stderr,
"Error: Width, height and pixel format have to be " 65 "constant in a rawvideo file, but the width, height or " 66 "pixel format of the input video changed:\n" 67 "old: width = %d, height = %d, format = %s\n" 68 "new: width = %d, height = %d, format = %s\n",
75 printf(
"video_frame n:%d coded_n:%d\n",
92 printf(
"audio_frame n:%d nb_samples:%d pts:%s\n",
116 fprintf(stderr,
"Error submitting a packet for decoding (%s)\n",
av_err2str(ret));
129 fprintf(stderr,
"Error during decoding (%s)\n",
av_err2str(ret));
150 int ret, stream_index;
157 fprintf(stderr,
"Could not find %s stream in input file '%s'\n",
162 st = fmt_ctx->
streams[stream_index];
167 fprintf(stderr,
"Failed to find %s codec\n",
175 fprintf(stderr,
"Failed to allocate the %s codec context\n",
182 fprintf(stderr,
"Failed to copy %s codec parameters to decoder context\n",
189 fprintf(stderr,
"Failed to open %s codec\n",
193 *stream_idx = stream_index;
203 struct sample_fmt_entry {
205 } sample_fmt_entries[] = {
215 struct sample_fmt_entry *entry = &sample_fmt_entries[
i];
216 if (sample_fmt == entry->sample_fmt) {
217 *fmt =
AV_NE(entry->fmt_be, entry->fmt_le);
223 "sample format %s is not supported as output format\n",
228 int main (
int argc,
char **argv)
233 fprintf(stderr,
"usage: %s input_file video_output_file audio_output_file\n" 234 "API example program to show how to read frames from an input file.\n" 235 "This program reads frames from a file, decodes them, and writes decoded\n" 236 "video frames to a rawvideo file named video_output_file, and decoded\n" 237 "audio frames to a rawaudio file named audio_output_file.\n",
247 fprintf(stderr,
"Could not open source file %s\n",
src_filename);
253 fprintf(stderr,
"Could not find stream information\n");
274 fprintf(stderr,
"Could not allocate raw video buffer\n");
294 fprintf(stderr,
"Could not find audio or video stream in the input, aborting\n");
301 fprintf(stderr,
"Could not allocate frame\n");
308 fprintf(stderr,
"Could not allocate packet\n");
337 printf(
"Demuxing succeeded.\n");
340 printf(
"Play the output video file with the command:\n" 341 "ffplay -f rawvideo -pix_fmt %s -video_size %dx%d %s\n",
353 printf(
"Warning: the sample format the decoder produced is planar " 354 "(%s). This example will output the first channel only.\n",
355 packed ? packed :
"?");
363 printf(
"Play the output audio file with the command:\n" 364 "ffplay -f %s -ac %d -ar %d %s\n",
static int output_audio_frame(AVFrame *frame)
const struct AVCodec * codec
static enum AVPixelFormat pix_fmt
This structure describes decoded (raw) audio or video data.
int av_image_alloc(uint8_t *pointers[4], int linesizes[4], int w, int h, enum AVPixelFormat pix_fmt, int align)
Allocate an image with size w and h and pixel format pix_fmt, and fill pointers and linesizes accordi...
static AVFormatContext * fmt_ctx
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
static int audio_frame_count
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
static int open_codec_context(int *stream_idx, AVCodecContext **dec_ctx, AVFormatContext *fmt_ctx, enum AVMediaType type)
static AVStream * video_stream
int avformat_open_input(AVFormatContext **ps, const char *url, ff_const59 AVInputFormat *fmt, AVDictionary **options)
Open an input stream and read the header.
static int output_video_frame(AVFrame *frame)
#define FF_ARRAY_ELEMS(a)
static int audio_stream_idx
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
static FILE * audio_dst_file
enum AVSampleFormat sample_fmt
audio sample format
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
static int video_stream_idx
timestamp utils, mostly useful for debugging/logging purposes
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
AVStream ** streams
A list of all streams in the file.
int avcodec_parameters_to_context(AVCodecContext *codec, const AVCodecParameters *par)
Fill the codec context based on the values from the supplied codec parameters.
#define AVERROR_EOF
End of file.
static uint8_t * video_dst_data[4]
int av_sample_fmt_is_planar(enum AVSampleFormat sample_fmt)
Check if the sample format is planar.
void av_dump_format(AVFormatContext *ic, int index, const char *url, int is_output)
Print detailed information about the input or output format, such as duration, bitrate, streams, container, programs, metadata, side data, codec and time base.
int av_find_best_stream(AVFormatContext *ic, enum AVMediaType type, int wanted_stream_nb, int related_stream, AVCodec **decoder_ret, int flags)
Find the "best" stream in the file.
static int video_dst_linesize[4]
static const char * audio_dst_filename
static AVStream * audio_stream
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
#define av_ts2timestr(ts, tb)
Convenience macro, the return value should be used only directly in function arguments but never stan...
static AVCodecContext * video_dec_ctx
int avcodec_receive_frame(AVCodecContext *avctx, AVFrame *frame)
Return decoded output data from a decoder.
const char * av_get_sample_fmt_name(enum AVSampleFormat sample_fmt)
Return the name of sample_fmt, or NULL if sample_fmt is not recognized.
void av_image_copy(uint8_t *dst_data[4], int dst_linesizes[4], const uint8_t *src_data[4], const int src_linesizes[4], enum AVPixelFormat pix_fmt, int width, int height)
Copy image in src_data to dst_data.
AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)
Allocate an AVCodecContext and set its fields to default values.
int width
picture width / height.
#define av_err2str(errnum)
Convenience macro, the return value should be used only directly in function arguments but never stan...
static const char * video_dst_filename
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
int avcodec_send_packet(AVCodecContext *avctx, const AVPacket *avpkt)
Supply raw packet data as input to a decoder.
int coded_picture_number
picture number in bitstream order
AVSampleFormat
Audio sample formats.
void avcodec_free_context(AVCodecContext **avctx)
Free the codec context and everything associated with it and write NULL to the provided pointer...
int sample_rate
samples per second
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
int main(int argc, char **argv)
main external API structure.
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
static int decode_packet(AVCodecContext *dec, const AVPacket *pkt)
static int get_format_from_sample_fmt(const char **fmt, enum AVSampleFormat sample_fmt)
static const char * src_filename
int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)
Initialize the AVCodecContext to use the given AVCodec.
int av_read_frame(AVFormatContext *s, AVPacket *pkt)
Return the next frame of a stream.
static AVCodecContext * audio_dec_ctx
AVCodec * avcodec_find_decoder(enum AVCodecID id)
Find a registered decoder with a matching codec ID.
static int video_frame_count
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
const char * av_get_media_type_string(enum AVMediaType media_type)
Return a string describing the media_type enum, NULL if media_type is unknown.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt)
Return number of bytes per sample.
enum AVSampleFormat av_get_packed_sample_fmt(enum AVSampleFormat sample_fmt)
Get the packed alternative form of the given sample format.
int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options)
Read packets of a media file to get stream information.
static AVCodecContext * dec_ctx
static FILE * video_dst_file
void avformat_close_input(AVFormatContext **s)
Close an opened input AVFormatContext.
int channels
number of audio channels
printf("static const uint8_t my_array[100] = {\n")
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
static int video_dst_bufsize
AVCodecParameters * codecpar
Codec parameters associated with this stream.
const char * av_get_pix_fmt_name(enum AVPixelFormat pix_fmt)
Return the short name for a pixel format, NULL in case pix_fmt is unknown.
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
uint8_t ** extended_data
pointers to the data planes/channels.
AVPixelFormat
Pixel format.
This structure stores compressed data.
int nb_samples
number of audio samples (per channel) described by this frame