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Rennes Emotion Map 2010-11
19 octobre 2011, par
Mis à jour : Juillet 2013
Langue : français
Type : Texte
Autres articles (95)
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Play video using HTML5 video tag
21 janvier 2014, par user3217695Hi i need to display video in all the browsers using html5.
I am uploading the file and creating html structure and it plays only mp4 format video, but not other uploaded formats, and i use command line to convert files but the converted files doesn't play in video tag.
For conversion I use
ffmpegvideo conversion from one towebmformat. Conversion works, but viedos don't play.Please find me
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15 septembre 2013, par Luca Barbato -
How to play audio using libao and FFmpeg in C ?
12 mars 2024, par OmegaLol21I am trying to create a simple prototype application that opens a video file and plays its audio. I am using the FFmpeg libraries (libavcodec, libavformat, etc) to open and decode the video, and I am attempting to use libao to play the audio. I tried looking up code examples but a lot of them either don't work or use deprecated functions.


So far, I managed to come up with this :


#include <libavcodec></libavcodec>avcodec.h>
#include <libavformat></libavformat>avformat.h>
#include <libswresample></libswresample>swresample.h>
#include <ao></ao>ao.h>

int main(int argc, char** argv) {
 AVFormatContext* format_ctx = avformat_alloc_context();
 int audio_stream_index = -1;
 AVCodecContext* codec_ctx = NULL;
 AVCodec* codec = NULL;
 AVPacket packet;
 AVFrame* frame = NULL;
 ao_device* device = NULL;
 ao_sample_format sample_format;
 uint8_t* output_buffer = NULL;
 int output_linesize;

 avformat_open_input(&format_ctx, "test.mp4", NULL, NULL);
 avformat_find_stream_info(format_ctx, NULL);

 for (int i = 0; i < format_ctx->nb_streams; i++) {
 if (format_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
 audio_stream_index = i;
 break;
 }
 }

 codec_ctx = avcodec_alloc_context3(NULL);
 avcodec_parameters_to_context(codec_ctx, format_ctx->streams[audio_stream_index]->codecpar);
 codec = avcodec_find_decoder(codec_ctx->codec_id);
 avcodec_open2(codec_ctx, codec, NULL);

 // Initialize libao
 ao_initialize();
 int driver_id = ao_default_driver_id();

 sample_format.bits = 16;
 sample_format.channels = 2;
 sample_format.rate = 44100;
 sample_format.byte_format = AO_FMT_NATIVE;
 sample_format.matrix = 0;
 device = ao_open_live(driver_id, &sample_format, NULL);
 if (!device) {
 fprintf(stderr, "Could not open audio device\n");
 return 1;
 }

 frame = av_frame_alloc();

 while (av_read_frame(format_ctx, &packet) >= 0) {
 if (packet.stream_index == audio_stream_index) {
 int ret = avcodec_send_packet(codec_ctx, &packet);
 if (ret < 0) {
 fprintf(stderr, "Error sending packet for decoding\n");
 break;
 }

 while (ret >= 0) {
 ret = avcodec_receive_frame(codec_ctx, frame);
 if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
 break;
 }
 else if (ret < 0) {
 fprintf(stderr, "Error during decoding\n");
 break;
 }

 ao_play(device, (char*)frame->data[0], frame->nb_samples * 2 * frame->channels);
 }
 }
 av_packet_unref(&packet);
 }

 // Clean up
 av_frame_free(&frame);
 avcodec_free_context(&codec_ctx);
 avformat_close_input(&format_ctx);
 ao_close(device);
 ao_shutdown();
 av_freep(&output_buffer);

 return 0;
}


This is the closest I have gotten to play audio. It plays audio but there is a lot of static sound in the background. I did try using using
frame->linesize[0]fornum_bytesinao_playbut that didn't produce a sound that sounded at all like the video.

Is there something I am doing wrong or missing ?


EDIT : While doing more testing, I managed to find out that the above code sample outputs pure static in the left speaker, however, in the right speaker, it does play the audio, albeit heavily distorted ?


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