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Médias (91)
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Chuck D with Fine Arts Militia - No Meaning No
15 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Paul Westerberg - Looking Up in Heaven
15 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Le Tigre - Fake French
15 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Thievery Corporation - DC 3000
15 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Dan the Automator - Relaxation Spa Treatment
15 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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Gilberto Gil - Oslodum
15 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
Autres articles (84)
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Publier sur MédiaSpip
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MediaSPIP v0.2
21 juin 2013, parMediaSPIP 0.2 is the first MediaSPIP stable release.
Its official release date is June 21, 2013 and is announced here.
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To get a working installation, you must manually install all-software dependencies on the server.
If you want to use this archive for an installation in "farm mode", you will also need to proceed to other manual (...)
Sur d’autres sites (7973)
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What to input for variable frame rate in pts / dts in ffmpeg
23 novembre 2014, par WilliamI am capturing frames from a webcam stream which sends frames in at a variable rate. My output video plays much faster than it was captured because there are less frames available than the input fps.
I’m really new to ffmpeg and don’t know what to put into pts and dts. I can get an Int64 representing nanoseconds since 1600 when the frame arrives. How do I use the av_rescale_q function with it ?
Reading online it seems a solution may be to clone frames so the output fits into a constant frame rate video. However it would be better just to put the timestamp in there.
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ffmeg mux video and audio into a mp4 file, no sound in quicktime player
10 novembre 2014, par user2789801I’m using ffmpeg to mux a video file and a audio file into a single mp4 file.The mp4 file plays fine on windows, but it has no sound in quicktime player on mac. And I get a error message "2041 invalid sample description".
Here’s what I’m doing,
First, I open the video file and the audio file, init a output frame context.
Then I add a video stream and a audio stream according to the video and audio files.
Then write the header, then start muxing, then write the trailer.Here’s my code
#include "CoreRender.h"
CoreRender::CoreRender(const char* _vp, const char * _ap, const char * _op)
{
sprintf(videoPath, "%s", _vp);
sprintf(audioPath, "%s", _ap);
sprintf(outputPath, "%s", _op);
formatContext_video = NULL;
formatContext_audio = NULL;
formatContext_output = NULL;
videoStreamIdx = -1;
outputVideoStreamIdx = -1;
videoStreamIdx = -1;
audioStreamIdx = -1;
outputVideoStreamIdx = -1;
outputAudioStreamIdx = -1;
av_init_packet(&pkt);
init();
}
void CoreRender::init()
{
av_register_all();
avcodec_register_all();
// allocate a memory for the AVFrame object
frame = (AVFrame *)av_mallocz(sizeof(AVFrame));
rgbFrame = (AVFrame *)av_mallocz(sizeof(AVFrame));
if (avformat_open_input(&formatContext_video, videoPath, 0, 0) < 0)
{
release();
}
if (avformat_find_stream_info(formatContext_video, 0) < 0)
{
release();
}
if (avformat_open_input(&formatContext_audio, audioPath, 0, 0) < 0)
{
release();
}
if (avformat_find_stream_info(formatContext_audio, 0) < 0)
{
release();
}
avformat_alloc_output_context2(&formatContext_output, NULL, NULL, outputPath);
if (!formatContext_output)
{
release();
}
ouputFormat = formatContext_output->oformat;
for (int i = 0; i < formatContext_video->nb_streams; i++)
{
// create the output AVStream according to the input AVStream
if (formatContext_video->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
{
videoStreamIdx = i;
AVStream * in_stream = formatContext_video->streams[i];
AVStream * out_stream = avformat_new_stream(formatContext_output, in_stream->codec->codec);
if (! out_stream)
{
release();
}
outputVideoStreamIdx = out_stream->index;
if (avcodec_copy_context(out_stream->codec, in_stream->codec) < 0)
{
release();
}
out_stream->codec->codec_tag = 0;
if (formatContext_output->oformat->flags & AVFMT_GLOBALHEADER)
{
out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
}
break;
}
}
for (int i = 0; i < formatContext_audio->nb_streams; i++)
{
if (formatContext_audio->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
{
AVCodec *encoder;
encoder = avcodec_find_encoder(AV_CODEC_ID_AAC);
audioStreamIdx = i;
AVStream *in_stream = formatContext_audio->streams[i];
AVStream *out_stream = avformat_new_stream(formatContext_output, encoder);
if (!out_stream)
{
release();
}
outputAudioStreamIdx = out_stream->index;
AVCodecContext *dec_ctx, *enc_ctx;
dec_ctx = in_stream->codec;
enc_ctx = out_stream->codec;
enc_ctx->sample_rate = dec_ctx->sample_rate;
enc_ctx->channel_layout = dec_ctx->channel_layout;
enc_ctx->channels = av_get_channel_layout_nb_channels(enc_ctx->channel_layout);
enc_ctx->time_base = { 1, enc_ctx->sample_rate };
enc_ctx->bit_rate = 480000;
if (avcodec_open2(enc_ctx, encoder, NULL) < 0)
{
release();
}
if (formatContext_output->oformat->flags & AVFMT_GLOBALHEADER)
{
out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
}
break;
}
}
if (!(ouputFormat->flags & AVFMT_NOFILE))
{
if (avio_open(&formatContext_output->pb, outputPath, AVIO_FLAG_WRITE) < 0)
{
release();
}
}
if (avformat_write_header(formatContext_output, NULL) < 0)
{
release();
}
}
void CoreRender::mux()
{
// find the decoder for the audio codec
codecContext_a = formatContext_audio->streams[audioStreamIdx]->codec;
codec_a = avcodec_find_decoder(codecContext_a->codec_id);
if (codec == NULL)
{
avformat_close_input(&formatContext_audio);
release();
}
codecContext_a = avcodec_alloc_context3(codec_a);
if (codec_a->capabilities&CODEC_CAP_TRUNCATED)
codecContext_a->flags |= CODEC_FLAG_TRUNCATED; /* we do not send complete frames */
if (avcodec_open2(codecContext_a, codec_a, NULL) < 0)
{
avformat_close_input(&formatContext_audio);
release();
}
int frame_index = 0;
int64_t cur_pts_v = 0, cur_pts_a = 0;
while (true)
{
AVFormatContext *ifmt_ctx;
int stream_index = 0;
AVStream *in_stream, *out_stream;
if (av_compare_ts(cur_pts_v,
formatContext_video->streams[videoStreamIdx]->time_base,
cur_pts_a,
formatContext_audio->streams[audioStreamIdx]->time_base) <= 0)
{
ifmt_ctx = formatContext_video;
stream_index = outputVideoStreamIdx;
if (av_read_frame(ifmt_ctx, &pkt) >=0)
{
do
{
if (pkt.stream_index == videoStreamIdx)
{
cur_pts_v = pkt.pts;
break;
}
} while (av_read_frame(ifmt_ctx, &pkt) >= 0);
}
else
{
break;
}
}
else
{
ifmt_ctx = formatContext_audio;
stream_index = outputAudioStreamIdx;
if (av_read_frame(ifmt_ctx, &pkt) >=0)
{
do
{
if (pkt.stream_index == audioStreamIdx)
{
cur_pts_a = pkt.pts;
break;
}
} while (av_read_frame(ifmt_ctx, &pkt) >=0);
processAudio();
}
else
{
break;
}
}
in_stream = ifmt_ctx->streams[pkt.stream_index];
out_stream = formatContext_output->streams[stream_index];
if (pkt.pts == AV_NOPTS_VALUE)
{
AVRational time_base1 = in_stream->time_base;
int64_t calc_duration = (double)AV_TIME_BASE / av_q2d(in_stream->r_frame_rate);
pkt.pts = (double)(frame_index * calc_duration) / (double)(av_q2d(time_base1) * AV_TIME_BASE);
pkt.dts = pkt.pts;
pkt.duration = (double)calc_duration / (double)(av_q2d(time_base1) * AV_TIME_BASE);
frame_index++;
}
pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, (enum AVRounding) (AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, (enum AVRounding) (AV_ROUND_NEAR_INF | AV_ROUND_PASS_MINMAX));
pkt.duration = av_rescale_q(pkt.duration, in_stream->time_base, out_stream->time_base);
pkt.pos = -1;
pkt.stream_index = stream_index;
LOGE("Write 1 Packet. size:%5d\tpts:%8d", pkt.size, pkt.pts);
if (av_interleaved_write_frame(formatContext_output, &pkt) < 0)
{
break;
}
av_free_packet(&pkt);
}
av_write_trailer(formatContext_output);
}
void CoreRender::processAudio()
{
int got_frame_v = 0;
AVFrame *tempFrame = (AVFrame *)av_mallocz(sizeof(AVFrame));
avcodec_decode_audio4(formatContext_audio->streams[audioStreamIdx]->codec, tempFrame, &got_frame_v, &pkt);
if (got_frame_v)
{
tempFrame->pts = av_frame_get_best_effort_timestamp(tempFrame);
int ret;
int got_frame_local;
int * got_frame = &got_frame_v;
AVPacket enc_pkt;
int(*enc_func)(AVCodecContext *, AVPacket *, const AVFrame *, int *) = avcodec_encode_audio2;
if (!got_frame)
{
got_frame = &got_frame_local;
}
// encode filtered frame
enc_pkt.data = NULL;
enc_pkt.size = 0;
av_init_packet(&enc_pkt);
ret = enc_func(codecContext_a, &enc_pkt, tempFrame, got_frame);
av_frame_free(&tempFrame);
av_frame_free(&tempFrame);
if (ret < 0)
{
return ;
}
if (!(*got_frame))
{
return ;
}
enc_pkt.stream_index = outputAudioStreamIdx;
av_packet_rescale_ts(&enc_pkt,
formatContext_output->streams[outputAudioStreamIdx]->codec->time_base,
formatContext_output->streams[outputAudioStreamIdx]->time_base);
}
}
void CoreRender::release()
{
avformat_close_input(&formatContext_video);
avformat_close_input(&formatContext_audio);
if (formatContext_output&& !(ouputFormat->flags & AVFMT_NOFILE))
avio_close(formatContext_output->pb);
avformat_free_context(formatContext_output);
}
CoreRender::~CoreRender()
{
}As you can see, I transcode the audio format into aac, and keep the video as it is.
Here’s how I use itCoreRender render("d:\\bg.mp4", "d:\\music.mp3", "d:\\output.mp4");
render.mux();
return 0;The video file is always in h.264 format.
So what I’m doing wrong ? -
FFMPEG Cutting Commercials puts audio out of sync
11 septembre 2014, par JaBbAUbuntu 14.04.1 with the real ffmpeg loaded (same problem with the avconv version).
I’m trying to take files created in MythTV with a HDPVR, cut the commercials and put the video into an MP4 container for use with MythRoku.
the command
ffmpeg -i $file -acodec copy -vcodec copy -f mp4 file.mp4Works fine. Once I update the database, I can watch the file in MythRoku or Plex.
However, when I try to cut out the commercials, the audio gets out of sync by just over 1 second (audio delayed) whenever I cut past the 0 mark. Totem Video player and VLC both play the resulting video fine, but I can see a "hitch" at the beginning while they are syncing the audio, so I know the information on the audio sync is in the file somewhere. Mythroku and Plex both are out of sync when playing the file. The MythTV Frontend player actually does play it correctly, and I can hear the "hitch" as it syncs the audio.
After hours of reading posts and playing with settings, I’ve got it down to this :
If I say :
ffmpeg -i $file -acodec copy -vcodec copy -f mp4 -ss 0 -t <anything> out.mp4</anything>The file is fine, plays both locally and in MythRoku/Plex
But if I advance the start any amount - even 1 second - audio is out of sync
ffmpeg -i $file -acodec copy -vcodec copy -f mp4 -ss 1 -t <anything> out.mp4</anything>I’ve tried splitting the video (as mp4) and audio (as ac3) first, splitting them separately, and then putting them back together as the last step, but I get the same results.
The information is in the file - Totem, VLC and the Frontend all can figure it out. How can I get ffmpeg to figure out the sync and write the file so it’s correct ?
Original file :
mythtv@marvin:~$ mediainfo /var/lib/mythtv/recordings/2225_20140824001500.mpg
General
ID : 0 (0x0)
Complete name : /var/lib/mythtv/recordings/2225_20140824001500.mpg
Format : MPEG-TS
File size : 4.03 GiB
Duration : 1h 45mn
Overall bit rate mode : Variable
Overall bit rate : 5 491 Kbps
Video
ID : 4113 (0x1011)
Menu ID : 1 (0x1)
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L4.0
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Format settings, GOP : M=4, N=32
Codec ID : 27
Duration : 1h 45mn
Bit rate mode : Variable
Bit rate : 4 831 Kbps
Maximum bit rate : 20.0 Mbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate : 59.940 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.087
Stream size : 3.55 GiB (88%)
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
Audio
ID : 4352 (0x1100)
Menu ID : 1 (0x1)
Format : AC-3
Format/Info : Audio Coding 3
Mode extension : CM (complete main)
Format settings, Endianness : Big
Codec ID : 129
Duration : 1h 45mn
Bit rate mode : Constant
Bit rate : 384 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Compression mode : Lossy
Delay relative to video : -6ms
Stream size : 289 MiB (7%)File cut from 0 :
mythtv@marvin:~$ mediainfo 2225_20140824001500_1.mp4
General
Complete name : 2225_20140824001500_1.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom
File size : 58.5 MiB
Duration : 1mn 45s
Overall bit rate mode : Variable
Overall bit rate : 4 676 Kbps
Writing application : Lavf54.63.104
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L4.0
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Format settings, GOP : M=4, N=32
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 1mn 45s
Bit rate mode : Variable
Bit rate : 4 281 Kbps
Maximum bit rate : 20.0 Mbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Frame rate : 59.940 fps
Minimum frame rate : 59.920 fps
Maximum frame rate : 59.960 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.077
Stream size : 53.6 MiB (92%)
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
Audio
ID : 2
Format : AC-3
Format/Info : Audio Coding 3
Mode extension : CM (complete main)
Format settings, Endianness : Big
Codec ID : ac-3
Duration : 1mn 45s
Bit rate mode : Constant
Bit rate : 384 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Compression mode : Lossy
Stream size : 4.81 MiB (8%)File cut from 1 second with audio sync problem :
mythtv@marvin:~$ mediainfo 2225_20140824001500_2.mp4
General
Complete name : 2225_20140824001500_2.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom
File size : 68.0 MiB
Duration : 2mn 0s
Overall bit rate mode : Variable
Overall bit rate : 4 750 Kbps
Writing application : Lavf54.63.104
Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : Main@L4.0
Format settings, CABAC : Yes
Format settings, ReFrames : 4 frames
Format settings, GOP : M=4, N=32
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 1mn 58s
Bit rate mode : Variable
Bit rate : 4 394 Kbps
Maximum bit rate : 20.0 Mbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Frame rate : 59.940 fps
Minimum frame rate : 59.920 fps
Maximum frame rate : 59.960 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.080
Stream size : 62.3 MiB (92%)
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709
Audio
ID : 2
Format : AC-3
Format/Info : Audio Coding 3
Mode extension : CM (complete main)
Format settings, Endianness : Big
Codec ID : ac-3
Duration : 2mn 0s
Bit rate mode : Constant
Bit rate : 384 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 KHz
Bit depth : 16 bits
Compression mode : Lossy
Stream size : 5.49 MiB (8%)
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