Mochtar was born in Cianjur, West Java, in 1918.
He was a Javanese of priyayi (noble) descent.
He did his elementary school studies at a Taman Siswa school in Bandung.

In 1935 Mochtar was cast in the leading role of Mahmud in Albert Balink's film Pareh.
Balink was out with coffee with Joshua and Othniel Wong and saw Mochtar, whom he considered tall, strong, and handsome, driving by.
Balink and the Wongs chased Mochtar in their car and caught him.
For the film Mochtar was told to use the title Raden, which he and his family had already abandoned.
According to the Indonesian anthropologist Albertus Budi Susanto, the emphasis on Mochtar's title was meant as a way to draw a higher-class audience.
The film, which cost 75,000 gulden to produce, was a commercial failure.
However, it was financially beneficial for Mochtar, who was paid a monthly retainer of 250 gulden.

Balink recalled Mochtar for his next film, Terang Boelan (Full Moon), in 1937.
Although the role called for Mochtar to sing he was unable to do so.
As such, the composer Ismail Marzuki was called to provide Mochtar's singing voice.
The film was a commercial success, garnering over 200,000 Singapore dollars during its international release.
This led to Mochtar becoming a bankable star and often playing alongside Roekiah.
The film also played a role in the establishment of a star system in the country's cinema.
Soon after the release of Terang Boelan Mochtar married the actress Soekarsih, whom he had met on the set of Pareh.

After the success of Terang Boelan and Balink's emigration to the United States, most of the cast – including Mochtar – were signed with Tan's Film.
Mochtar's first film with the company, Fatima (1938), was a commercial success, earning 200,000 gulden on a 7,000 gulden budget.
After making several further films, by 1940 Mochtar had left Tan's over a wage dispute.
He made a further three films with Yo Kim Tjan's Populair Films before transferring to Action Film.
Mochtar was born in Cianjur, West Java, in 1918. He was a Javanese of priyayi (noble) descent. He did his elementary school studies at a Taman Siswa school in Bandung.
In 1935 Mochtar was cast in the leading role of Mahmud in Albert Balink's film Pareh. Balink was out with coffee with Joshua and Othniel Wong and saw Mochtar, whom he considered tall, strong, and handsome, driving by. Balink and the Wongs chased Mochtar in their car and caught him. For the film Mochtar was told to use the title Raden, which he and his family had already abandoned. According to the Indonesian anthropologist Albertus Budi Susanto, the emphasis on Mochtar's title was meant as a way to draw a higher-class audience. The film, which cost 75,000 gulden to produce, was a commercial failure. However, it was financially beneficial for Mochtar, who was paid a monthly retainer of 250 gulden.
Balink recalled Mochtar for his next film, Terang Boelan (Full Moon), in 1937. Although the role called for Mochtar to sing he was unable to do so. As such, the composer Ismail Marzuki was called to provide Mochtar's singing voice. The film was a commercial success, garnering over 200,000 Singapore dollars during its international release. This led to Mochtar becoming a bankable star and often playing alongside Roekiah. The film also played a role in the establishment of a star system in the country's cinema. Soon after the release of Terang Boelan Mochtar married the actress Soekarsih, whom he had met on the set of Pareh.
After the success of Terang Boelan and Balink's emigration to the United States, most of the cast – including Mochtar – were signed with Tan's Film. Mochtar's first film with the company, Fatima (1938), was a commercial success, earning 200,000 gulden on a 7,000 gulden budget. After making several further films, by 1940 Mochtar had left Tan's over a wage dispute. He made a further three films with Yo Kim Tjan's Populair Films before transferring to Action Film.
Rd Mochtar