On 21-11-2024 10:41, d.gorde...@ngslab.ru wrote:
Hello.
I'm trying to make a mp4 file from a video/audio stream. When audio is
AAC it works fine. But I cannot pack G711U audio.
|av_register_all(); avcodec_register_all();
av_log_set_callback(nullptr); av_format_context_ =
avformat_alloc_context(); if (!av_format_context_) { std::string
error_msg = "Failed to allocate avformat context";
log_->Error(error_msg); throw std::runtime_error(error_msg.c_str()); }
av_format_context_->oformat = av_guess_format("mp4", filename.c_str(),
NULL); strcpy(av_format_context_->filename, filename.c_str());
AVCodec* codec = avcodec_find_encoder(AV_CODEC_ID_PCM_MULAW);
av_format_context_->oformat->audio_codec = codec->id; audio_stream_ =
avformat_new_stream(av_format_context_, codec); if (audio_stream_ ==
nullptr) { log_->Error("Can not create audiostream."); return false; }
AVCodecContext& codec_context = *audio_stream_->codec; if
(avcodec_copy_context(audio_stream_->codec,
av_format_context_->streams[1]->codec) != 0) { log_->Error("Failed to
Copy Context"); return false; } audio_stream_->time_base = { 1,
codec_context.sample_rate }; if (av_format_context_->oformat->flags &
AVFMT_GLOBALHEADER) codec_context.flags |=
AV_CODEC_FLAG_GLOBAL_HEADER; log_->Info("Init output {}", filename);
av_dump_format(av_format_context_, 0, filename.c_str(), 1); int ret =
avio_open(&av_format_context_->pb, filename.c_str(), AVIO_FLAG_WRITE);
if (ret < 0) { log_->Error("Can not open file for writing."); return
false; } ret = avformat_write_header(av_format_context_, NULL); if
(ret < 0) { log_->Error("Can not write header."); return false; } |
Here avformat_write_header() returns -22. What's wrong here? Which
data should I supply to this function?
_______________________________________________
The MP4 container only supports a few audio codecs namely these:
Advanced Audio Coding (AAC)
<https://en.wikipedia.org/wiki/Advanced_Audio_Coding>, Audio Lossless
Coding <https://en.wikipedia.org/wiki/Audio_Lossless_Coding> (ALS),
Scalable Lossless Coding
<https://en.wikipedia.org/wiki/Scalable_Lossless_Coding> (SLS), MP3
<https://en.wikipedia.org/wiki/MP3>, MPEG-1 Audio Layer II
<https://en.wikipedia.org/wiki/MPEG-1_Audio_Layer_II> (MP2), MPEG-1
Audio Layer I <https://en.wikipedia.org/wiki/MPEG-1_Audio_Layer_I>
(MP1), CELP <https://en.wikipedia.org/wiki/CELP>, HVXC
<https://en.wikipedia.org/wiki/HVXC> (speech), TwinVQ
<https://en.wikipedia.org/wiki/TwinVQ>, Text To Speech Interface (TTSI)
and Structured Audio Orchestra Language
<https://en.wikipedia.org/wiki/Structured_Audio_Orchestra_Language>
(SAOL), Apple Lossless <https://en.wikipedia.org/wiki/Apple_Lossless>,
Free Lossless Audio Codec <https://en.wikipedia.org/wiki/FLAC> (added in
late 2018), and Opus <https://en.wikipedia.org/wiki/Opus_(audio_format)>
(added in late 2018)
Use a different container like MKV if you want support for almost every
audio codec available
_______________________________________________
ffmpeg-user mailing list
ffmpeg-user@ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-user
To unsubscribe, visit link above, or email
ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
